C2-030.840.01.08.02.pdf

r G s n m ie S

SOMATOM Definition Flash CT

Troubleshooting Guide System Instructions for Troubleshooting

© Siemens, 2009

10430603

© Siemens, 2009 - For internal use only - All documents may only be used by authorized personnel for rendering services on Siemens Healthcare Products. Any document in electronic form may be printed once. Copy and distribution of electronic documents and hardcopies is prohibited. Offenders will be liable for damages. All other rights are reserved.

Print No.: Replaces:

C2-030.840.01.08.02 C2-030.840.01.07.02

English Doc. Gen. Date: 08.11 H CX CS SD CR-CT n.a.

2009

2

Copyright / Version / Disclaimer

1Copyright / Version / Disclaimer

Copyright “© Siemens, 2009“ refers to the copyright of a Siemens entity such as Siemens Aktiengesellschaft - Germany, Siemens Shenzhen Magnetic Resonance Ltd. - China, Siemens Shanghai Medical Equipment Ltd. - China, Siemens Medical Solutions USA Inc. - USA and/or Siemens Healthcare Diagnostics Inc. - USA. Document Version Siemens reserves the right to change its products and services at any time. In addition, manuals are subject to change without notice. The hardcopy documents correspond to the version at the time of system delivery and/or printout. Versions to hardcopy documentation are not automatically distributed. Please contact your local Siemens office to order current version or refer to our website http://www.healthcare.siemens.com. Disclaimer Siemens provides this documentation “as is“ without the assumption of any liability under any theory of law. The service of equipment described herein is to be performed by qualified personnel who are employed by Siemens or one of its affiliates or who are otherwise authorized by Siemens or one of its affiliates to provide such services. Assemblers and other persons who are not employed by or otherwise directly affiliated with or authorized by Siemens or one of its affiliates are not entitled to use this documentation without prior written authority.

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Table of Contents

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0Table of Contents

1 _______ General ________________________________________________________ 8 Safety information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Safety warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Information for switching off the gantry power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Service push-button S1 in PDC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Safety bolts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Data ring protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Open/close the upper front ring segment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Closing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Edge protective strips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Error message telegram structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2 _______ XRS __________________________________________________________ 21 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Definitions and abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

21 21 21 21 22

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Problem isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Generator oscillator procedure (GenOSC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 XDC/Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 XDC/Tube Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 XDC/Tube test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 High voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HV troubleshoot test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSG high voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HV plugs with arcing tracks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HV plug installation at HV sockets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High voltage tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

25 25 25 30 31 32

Filament (FIL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 TSG filament . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Filament . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Anode rotation (RAC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 TSG Anode Rotation (RAC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Single pulse test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Single pulse test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Single pulse test diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 MVT cable check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Performing the MVT cable check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Arcing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Check/adjust the tube oil pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 XRS hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

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Table of Contents Switching on status indicator of XGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 Measuring points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 Measuring points D700, D701, D702, D703 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 LED´s on D700, D701, D702, D703 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

3 _______ DMS __________________________________________________________ 64 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Definitions and abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

64 64 64 65 65

TSG Image Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSG strong rings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSG sporadic strong rings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSG weak rings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSG sporadic weak rings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSG rings in outer slices only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSG Streak artifacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSG Dual Source problems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSG Spatial Resolution (bad MTF results) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSG other artifacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tests for Image Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

66 66 67 68 69 70 71 72 73 74 75 76

TSG DMS Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 TSG DMS Power path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 TSG UHR mechanics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 Tests & Hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 DAS Type not o.k. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 Firmware update failed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 Dynamic collimation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 Signals from half detector missing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 Storage of Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 Hints for defective channel detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 Distinguishing between the module and other components . . . . . . . . . . . . . . . . . . 102 How to interpret the physicist’s line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

4 _______ Datalink ______________________________________________________ 103 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Definitions and abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

103 103 103 103 104

Troubleshooting Data transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 TSG Datalink. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 TSG permanent errors on DAS Controller(s) > IRS Receiver . . . . . . . . . . . . . . . . . 113 TSG data quality at Tx modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

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TSG data quality at RX modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSG sporadic errors in link DCON > IRS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Step 1 (checking) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Step 2 (debugging) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Step 3 (localizing) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

115 116 117 117 118

Tests for data transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123 Cleaning a fiber optic cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123 Data link test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123 Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . How check the transmitting antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Measuring the fiber optic signal along the link . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check the electrical RF signals at the Rx modules. . . . . . . . . . . . . . . . . . . . . . . . . Check the quality of data signal (jitter) at the REC input . . . . . . . . . . . . . . . . . . . .

126 126 127 127 128

5 _______ Fastlink ______________________________________________________ 129 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Definitions and abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

129 129 129 130 130

TSG Fastlink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSG rotating fastlink connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSG stationary fastlink connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSG for connection UMAS > UMAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSG for connection UMAR > UMAS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSG data quality at Tx modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSG data quality at Rx modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tests for data transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

131 132 135 139 141 143 144 145

6 _______ CAN Bus _____________________________________________________ 149 CAN Bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Data transfer UMAS to UMAR via CAN slip ring. . . . . . . . . . . . . . . . . . . . . . . . . . . Data transfer UMAS to UMAR via Fast Link (function pack 1: CAN over IP) . . . . . TSG CAN bus (rotating part). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TSG CAN bus to XGS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

149 149 150 152 153

7 _______ CANopen Bus_________________________________________________ 157 CANopen Bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157 TSG CAN open bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157 CAN open external bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

8 _______ Stop report loop_______________________________________________ 161 Stop report loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 TSG stop report loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

9 _______ Network______________________________________________________ 167 Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167 Ethernet switches (located in PDC_A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

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Table of Contents Troubleshooting network components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

10 ______ Rotating controller _____________________________________________ 172 Rotating controller tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172 DOM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172 COC (Tube collimator) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172

11 ______ Stationary controller ___________________________________________ 174 Stationary controller tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Master stationary (MAS) test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gantry panel control (GPC) test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rotation control (ROT) test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Patient Handling System (PHS) test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CPI (PMM) test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

174 174 174 175 175 176 177

12 ______ System test___________________________________________________ 179 System test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DOM functional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X-ray timeout test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dyn. Collimation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

179 179 180 180

13 ______ Cooling System _______________________________________________ 182 Water cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182 TSG Water Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

14 ______ PDC_A cabinet ________________________________________________ 192 General overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192 Power distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Errors and troubleshooting hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Circuit breakers and relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Residual current monitor F18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service pushbutton S1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Relays K1, K2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Line voltage circuit breaker test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service power socket. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Volt power supply for U1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

193 193 195 195 199 200 201 202 204 204 206

15 ______ Bad motor controller after corrupted FW update____________________ 208 Information for systems with SOMARIS/7, versions below VA40 . . . . . . . . . . . . . . . . . 208 Work steps for systems with SOMARIS/7, versions VA40 and higher . . . . . . . . . . . . . 209

16 ______ Changes to Previous Version ____________________________________ 210

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Table of Contents

7

17 ______ Index ________________________________________________________ 211

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8

General 1-

Safety information

1General

0

Only qualified and system-trained service staff are allowed to perform CT system installation, service, maintenance, and quality assurance. Ensure that the most recent version of the service documentation is on hand. To avoid any risk of injury to persons and/or damage to the system, read and observe the General Safety Notes (TD00-000.860.01.xx.xx). Please read and observe the Product-specific safety notes (C2-030.860.01.xx.xx) which include very important safety-related information as well as information about handling of screws and nuts, use of Loctite, and instructions for torque wrenches. You will find the following information in the “Product-specific safety notes.”

• Safety information related to the method of risk management new link

• General safety information such as the handling of service documentation, CT system training request, X-ray protection, electrical protection, service tools... (C2-030.860.01 / General safety warnings).

• General safety information about working in the gantry with the power off/on (C2-030.860.01 / Powering off the gantry and preparing to work on it).

• Use of the patient table as lifting device for gantry part replacement (C2-030.860.01 / Usage of the Patient Table as a Lifting Device).

• Laser products (C2-030.860.01 / Laser products). • Attachment of screws and nuts, use of Loctite, adjustment instructions for the torque wrench (C2-030.860.01 / Screw connections).

Safety warnings

0

The following safety information is an extract from the information in the Product-specific safety notes (C2-030.860.01.xx.xx) (C2-030.860.01 / Safety information). It is mandatory to read and observe the safety information described below.

CAUTION

[ hz_serdoc_F13G02U01M04 ]

Flammable sprays. Risk of inflammation! ¹ Only use approved and recommended cleaning agents as described. CAUTION

[ hz_serdoc_F13G07U01M01 ]

Handling parts of the system that may have come into contact with patients may lead to infection caused by blood-borne pathogens. Infection caused by blood-borne pathogens! ¹ Take appropriate precautions against exposure to blood-borne pathogens (e.g. wear gloves).

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General

9 WARNING

[ hz_serdoc_F13G01U13M02 ]

High voltages and/or mechanical movements (e.g. gantry rotation) may lead to accidents and injuries when opening system covers. Risk of accident or injury! ¹ Only authorized service personnel are allowed to open system covers. CAUTION

[ hz_serdoc_F13G01U03M01 ]

Non-compliance with X-ray regulations may lead to radiation exposure to you and/or other persons. Risk of radiation exposure! Observe radiation protection regulations when X-rays are switched on, e.g. : ¹ Never work inside the gantry room. ¹ Do not leave the system unattended. ¹ Make sure there isn't anyone inside the gantry room. ¹ Ensure that personnel cannot enter the gantry room unnoticed (e.g. lock doors, if necessary). WARNING

[ hz_serdoc_F13G01U05M03 ]

Dangerous voltages are present when the system is switched on. Dangerous voltages may be present even when the system is switched off due to capacity power. Risk of electric shock! ¹ Observe power-off instructions and discharge wait times (allow at least five minutes discharge time after the last scan for all involved HV and UDC/UPS parts). ¹ Secure the system against unintended switch-on (e.g. block breaker and/or mark breaker against switch-on). ¹ Ensure via measurements that all voltages are switched off. ¹ Connect the stationary and rotating parts of the gantry to a protective conductor prior to working in the gantry. CAUTION

[ hz_serdoc_F13G01U06M01 ]

Rotating parts are exposed when gantry covers are opened. Risk of injury! ¹ Maintain a safe distance and ensure that objects do not come in contact with rotating parts.

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10

General CAUTION

[ hz_serdoc_F13G05U01M04 ]

Unfixed parts/cables during gantry rotation. Risk of accident or injury! ¹ Make sure that all parts and cables are mounted properly before starting rotation. CAUTION

[ hz_serdoc_F13G02U01M01 ]

Temperature of tube and/or tube cooling device parts may be above 70°C (with Straton up to 130°C). Risk of burns! ¹ Avoid contact with oil and exposed parts of X-ray tube and cooling device. ¹ Wait until tube and cooling device parts are chilled down.

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General

11

Information for switching off the gantry power

1.1

• Always read and observe the switching-off/-on instructions described in the Product-specific safety notes (C2-030.860.01.xx.xx) (C2-030.860.01 / Product-specific safety notes). In the individual Replacement of Parts sections, always refer to the switching-off/-on worksteps given in the instructions. To reach system standby status with the panels removed (rear ring removed), install a CB (cover bridge #8904752) with switched-off system. After SYS/ON, an Init/Resuming of the system is performed and the system will reach standby status.

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General

Service push-button S1 in PDC

Fig. 1:

1.2

Service push-button S1

Pos. 1

Service push-button S1

Pos. 2

Push-button

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General

13

Safety bolts

1.3

• Front safety bolt > located at the bottom right gantry front

Fig. 2:

Front rotation safety bolt - unlock position

Fig. 3:

Front rotation safety bolt - lock position

Lock gantry rotation

• Press bolt slightly to the right (left image, item 1) to release the bolt lock (left image, item 2).

• Press bolt lock towards the gantry (left image, item 2) and move the safety bolt to the left until the bolt is in lock position. ¹ Make sure that the bolt lock (left image, item 2) moves towards the table side (forced by the spring of the locking mechanism). This ensures that the rotation lock position is fixed and secured. Unlock gantry rotation

• Press bolt slightly to the left (right image, item 1) to release the bolt lock (right image, item 2).

• Press bolt lock (right image, item 2) towards the gantry and move the safety bolt to the right until the bolt is in unlock position. ¹ Make sure that the bolt lock (right image, item 2) moves towards the table side (forced by the spring of the locking mechanism). This ensures that the rotation lock position is fixed and secured.

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14

General • Rear safety bolt

Fig. 4:

• Rear rotation safety bolt (item 1) located between XGR A and HV-tank A at the rear of the gantry.

• Lift bolt and turn it 90 degrees to bring it into the lock or unlock position. ¹ Make sure that the bolt is really at the correct (lock/unlock) position. If the bolt accidentally moves into the lock position during rotation, the gantry may be damaged.

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General

15

Data ring protection

1.4

• Installing the data ring protection

Fig. 5:

Data ring protection

• Install the 2 data ring protectors (e.g. item 1) before working at the gantry front. - 2 Plexiglas protectors are necessary to cover a larger area on the data ring. - Attach them to the stationary data ring. - Do not forget to remove the protectors before starting gantry rotation.

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16

General

Open/close the upper front ring segment

1.5

Opening

0

• Release locks and attachment nuts

Fig. 6:

Front top ring segment

• Remove the four M13 nuts (item 2). • Loosen the 2 securing locks (arrows, 1/4 turn) using a 5 mm hexagonal wrench key.

• Pull top of ring segment out of its positioning clamps (item 3) to the outer end stop.

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General

17

• Lift the upper front ring segment to service position.

Fig. 7:

Upper front segment opened

Fig. 8:

Supporting stand gantry lock

• Lift the top segment with one hand. • Remove the supporting stand (item 2) from its parking position and extend it until it is blocked.

• Secure the supporting stand to the lock (item 3). • Go to the second support stand (do not walk between table and gantry) and secure the second supporting stand to the lock as done before.

• Install the edge protective strips (two pieces) so that the complete upper front ring segment edge is fully covered (see (Edge protective strips / p. 19))

Closing

0

• Remove the edge protective strips (Edge protective strips / p. 19). • Close the upper front ring segment, following in reverse order the instructions for opening it. NOTE

Verify that there is enough grease in the slot of the plastic ring. If not, add grease to the slot. The grease seals prevent liquid from coming into the gantry. See the SPC for the relevant material number.

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18

General

Fig. 9:

Park position of supporting stands

• Ensure that the supporting stands are securely locked in their parking positions (arrow) before the gantry cover is closed. ¹ Improperly parked supporting stands will lead to severe damage of components inside the gantry!

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General

19

Edge protective strips

1.6

• Install the two edge protective strips.

Fig. 10: Edge protective strip

• Install the edge protective strips (two pieces) so that the complete upper front ring segment edge is fully covered (see image). ¹ Install the edge protective strips as soon the upper front segment is opened. ¹ The protective strips are delivered with the system.

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20

General

Error message telegram structure

1.7

Structure of the error message telegram, see below.

Fig. 11: Error telegram

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XRS General

2XRS

21 20

Safety

0

WARNING

[ hz_serdoc_F13G01U12M03 ]

Avoid accident and injury or damage to parts. Risk of accident and injury! ¹ Read and observe the safety information contained in the “General” section of this document and/or the “Product specific safety notes”.

Notes

0

This section contains information on isolating XRS problems

• Section “General” > general information. • Section “Overview” > XRS Information. • Section “High voltage” > High voltage TSG followed by high voltage test descriptions.

• • • • •

Section ”Filament” > Filament TSG followed by filament test description. Section ”Anode rotation” > anode rotation TSG followed by RAC test description. Section ”MV cable check” > Single Pulse test. Section ”XRS hints” > XRS hints. Section ”Measuring point” > Table of LEDs and measuring points on XGS/XRS.

Definitions and abbreviations Tab. 1

0

Definitions and abbreviations

Term

Definition / Abbreviation

XDC

X-ray deflection control

XGR

X-ray generator, rotating

XGS

X-ray generator, stationary

XRS

X-ray system

XRT

X-ray tube

XTA

Tube assembly

XTC

X-ray tube cooling

MVT

Middle voltage transmission

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XRS Term

Definition / Abbreviation

HVT

High voltage tank

TSG

Troubleshooting Guide

Prerequisites

0

Documents n.a. Tools and auxiliary equipment

• Standard tool set • HV test plugs

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XRS

23

Overview

2.1

The XRS section contains information on possible XRS tests and the corresponding Troubleshooting Guides. With the SOMATOM Definition Flash, troubleshooting always starts by calling up the eventlog and searching for the relevant error message. Follow the instructions given in this error message for troubleshooting. In some cases, the error message links you to Troubleshooting Guides as described in this document. This link is normally used if the Troubleshooting Guide is too complex or images are needed for troubleshooting. Additionally, read the information stored in the tube history (Local Service >Report). This information can always be useful in case of XRS problems.

Problem isolation

0

Principle problem isolation in case of XRS problems 1. Find the according error message in Eventlog NOTE

The XGR and XGS assemblies are continuously communicating using the CAN bus after the system is switched on. For this reason, 2 error messages are usually sent to the logbook after XRS problems. Always check both (XGS/XGR) error messages when troubleshooting.

2. Follow the instructions given in the extended error message for troubleshooting ¹ The information provided in the error message guides you in finding the problem. In some cases, you are linked to the Test and Troubleshooting instructions, # C2-030.840.01.... In this case, follow the relevant Troubleshooting Guides described in this document.

Generator oscillator procedure (GenOSC)

0

Generator oscillator adaptation (Gen-Osc) is an automatic program. The function of the program is to adapt the inverter frequencies. The program performs very short scans with different inverter frequencies to find the minimum resonance point. This value is stored to D700 in XGS. The frequency adaptation procedure must run successfully; otherwise, XRS errors such as UT too high or UT max errors (e.g XRS_83 error) may abort scanning. The same errors may appear if parts of the oscillating circuit (e.g MV cable, XGS_PDC_Control, HVT / MVT) have been replaced without performing GenOSC after the replacement. For this reason, always use the relevant guided tour after the replacement of parts.

NOTE

© Siemens, 2009 For internal use only

If GenOsc fails because of arcing, try using dummy plugs (i.e. test plugs for HVT) and perform GenOsc again with dummy plugs installed.

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24

XRS

XDC/Tube

2.2

XDC/Tube Test

0

INIT Tests: During INIT, all XRT drivers of the XDC (outputs on X13 and X14) are tested in 2 steps. The first step is an isolation check for detecting short circuits between the output wires and ground or power (230 V). This step can detect defective driver gates within the XDC as well. The second step activates the drivers and can detect short circuits between the output wires or broken wires. The INIT tests have failed if any warning or error message occurs in the Eventlog during step 1 or 2, or if the requested currents in step 2 cannot be reached. XDC/Tube Self-Test within Service SW: The XDC/tube self-test is basically the same as the INIT test except that the grid function is tested as well. Depending on the actual system state, the XDC/tube self-test tolerates some problems. Therefore, if the XDC/tube self-test fails, switch the gantry off and then on again to initialize an INIT test. Test results: When the test fails, it leads to the warning message " CT_DCA/B 31" where the parameters give information on which part of the test fails. In addition to this information, there can be additional errors or warnings which indicate the error. Follow the instructions in the warning/error message for troubleshooting Usage of the tests: The XDC/Tube self-test can help detect problems in the output drivers of the XDC, problems within cabling, or problems within the tube. The test can be helpful, when the XDC has aborted scans with the error message "CT_DCA/B 51 .." or "CT_DCA/B 50" especially when parameter 3 is 0 x 00, 0 x 01, 0 x 04, 0 x 05, 0 x 08, 0 x 09, 0 x 12, 0 x 17, 0 x 1D, 0 x 1E or 0 x 1F. Be aware that any of these errors can happen during arcing as well, without any real HW problem within the XDC or the tube. If the INIT tests fail, you have a problem in the XDC, cabling, or the tube. If any additional error or warning message occurs in the Eventlog during INIT, it can be used to help detect where the problem is located. You can disconnect the cable on the XDC (X13 and X14) and/or the tube (X8 and X4) and then repeat the INIT test. When the additional errors/warnings disappear, you have disconnected the faulty part from the XDC. Remark: Test can be used when the system is or is not in stand-by status.

XDC/Tube test

0

XDC/Tube test Performing the filament test 1. Select Local Service > Test Tools > Tube/Generator 2. Select XDC/Tube. 3. Click GO and follow the instructions in the dialog. The test is terminated automatically.

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XRS

25

High voltage

2.3

HV troubleshoot test

0

This test tool supports the troubleshooting in case of high voltage issues. The HV troubleshoot test analyzes the last 1000 scans and requires at least 200 scans. Thus, for a useful result it is a prerequisite that the system has been in normal operation for about one week prior to using this tool. Consequently, the test tool is not suited to verify the success of recent service work. For example: If Getter was performed before the tool is used, this falsifies the result. The test evaluates the circumstances which might have caused scan aborts due to arcings in the tube history. Based on the test results, certain worksteps/checks are listed in a flowchart which follows the TSG high voltage part.

NOTE

The HV troubleshooting test analyzes only arcings which caused scan aborts. A continuous decline of the tube power cannot be identified by this tool.

Please note the following conditions and limitations for successful use of the HV troubleshooting test:

• The HV troubleshooting test can only be used when the scan aborts caused by arcings have occurred; otherwise misleading results may be produced.

• The HV troubleshooting test analyzes the last 1000 scans. e.g. if you have tightened the oil couplings after a first run of the tool and you run the tool again, the tool will present the same result as before.

• If less than 200 scans have been performed with a tube, the tool does not perform evaluation.

• For meaningful results, the system must have been in normal operation for about one week prior to using the tool! Therefore, the tool is not suitable for verifying the success of recent service work.

TSG high voltage

0

The following high voltage TSG is used in case of high voltage problems. The TSG provides a guide line to troubleshoot HV problems.

© Siemens, 2009 For internal use only

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26

XRS Tab. 2

High voltage TSG

Step 1

Action

• Check the Eventlog for: UT max and /or UT too high errors (e.g CT_GSA/GRA_83) or arcing problems (CT_GSA/GRA_68)

• If above-mentioned error appears > continue with item 2 • In all other cases > check Eventlog for other error message instructions. 2

• Perform the tube history evaluation (Local Service > Test tools > Tube/Generator > HV troubleshoot A or B). One of the following messages (1-7) is displayed after tube history evaluation. Follow the instructions given in the text and see flowchart (Fig. 12 / p. 29) as a guide: 1. Tube history does not contain enough scans for evaluation > no evaluation possible > continue with item 3. 2. Tube history evaluation does not indicate a tube arcing problem leading to scan aborts > no XRT/XTC Problem > check Eventlog for other error messages and follow instructions given in the message. 3. Tube history evaluation does not show a considerable number of tube arcs > no evaluation possible > continue with item 3. 4. Tube history evaluation shows tube arcs caused by low oil-pressure > Assure properly closed cooling hose couplings at tube and cooling unit. . ¹ If the couplings were properly closed, replace both the tube and tube cooling unit. 5. Tube history evaluation shows tube arcs caused by low oil-pressure or even loss of oil Check the gantry for oil contamination. If found, clean it, replace both the tube and tube cooling unit and inform HSC CT. ¹ If no oil found, assure properly closed cooling hose couplings at tube and cooling unit ¹ If the couplings were properly closed, replace both the tube and tube cooling unit. 6. Tube history evaluation shows mainly one side tube arcs without cooling oil-pressure correlation Check HV plugs for burn marks (examples see (HV plugs with arcing tracks / p. 30) ¹ If burn marks are visible, clean the HV plugs and receptacles (inside) with alcohol. If the problem persists, replace the tube or HV cable connection to HV tank. ¹ If no burn marks are visible, perform HVC plug tests as shown in the flowchart (Fig. 12 / p. 29) . 7. Tube history evaluation shows tube arcs without cooling oil-pressure correlation Getter tube > If problem persists, replace the tube.

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XRS

27 Step

Action

3

• Perform GenOSC (Local Service > Tune-up > Expert Mode > GenOSC). a) if GenOSC is aborted due to a problem > continue with item 4 b) if the HV problem is not solved after GenOSC > continue with item 5. c) if the HV problem is solved > GenOSC tables are stored in D700 XGS. No further action is necessary.

4

• Perform GenOSC with installed test plugs. See test plug installation (HVC with plug test / p. 33). a) if the GenOSC is still aborted > check the Eventlog for CT_GSA/GRA messages and follow the instructions given in the error message. b) if the GenOSC is ok > try GenOSC again with installed X-ray tube > if the problem recurs exchange XRT (X-ray tube).

5

• Perform Gettering (Local Service > Tune-up > Expert Mode > Getter). a) if the HV problem is not solved after gettering the tube > continue with item 6. b) if the HV problem is solved > no further action.

6

1. Switch system to the COMP/ON status at the control box. 2. Press service switch S1 in the PDC to switch off the gantry power. 3. Switch off rotation enable switch S301. 4. Remove HV plugs from the HV tank and the HV sockets. 5. Check HV plugs for signs of arcing (black dots or stripes (HV plugs with arcing tracks / p. 30)). a) If there are any signs of arcing > continue with item 7 b) If there are no signs of arcing > continue with item 8.

7

• If there are any signs of arcing on the HV plugs, HV receptacles or the insulators > clean the parts with alcohol. a) If any signs of arcing (cracks) remain > change the relevant parts. b) If there are no signs of arcing remaining on the parts > reinstall HV plugs using new silicon disks or insulators. Try scanning again > if the HV problems recur continue with item 8.

8

• Perform the HVC tube test (Local Service > Test Tools > Tube/Generator > HVC tube). Follow the dialog of the HVC tube test (tube test with high voltage but without load). a) If there are CT_GSA/GRA error messages found in the Eventlog > continue with item 9. b) If there are no CT_GSA/GRA error messages found in the Eventlog > continue with item 11.

© Siemens, 2009 For internal use only

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28

XRS Step

Action

9

• Perform the HV plug test with installed dummy plugs ( #10 093 700) at the HV sockets . Follow the dialog of the HVC plug test (Local Service > Test Tools > Tube/Generator > HVC with plugs). ¹ Install the HV test plugs into the HV sockets using new insulators and tighten the HV plugs with a torque of 25 Nm. a) If the test is aborted after 80 s by the UMAR (scan time exceeded), there is no HV problem on generator side > change tube. b) If there are still CT_GSA/GRA error messages found in the logbook > continue with item 10.

10

• Perform HVC plug test scans with installed dummy plugs (#1621791) at HV tank (Local Service > Test Tools > Tube/Generator > HVC with plugs). Follow the dialog of the HVC plug test. a) If there are no CT_GSA/GRA error messages found in the logbook (UMAR errors are acceptable) > change both HV cables including the HV sockets. b) If there are CT_GSA/GRA error messages found in the logbook > change HVT.

11

• The HV problem is related to tube load. Possible reasons: Inverter problem, ground problem, HVT. a) Check Eventlog for XRS errors related to inverters > if there are any, follow the instructions given in the error message. b) Check ground connections (bad contact....) of the XGS parts. c) Perform the single pulse test.

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29

Fig. 12: HV TSG

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XRS

HV plugs with arcing tracks

0

HV plugs and insulators with arcing tracks

Fig. 13: HV plug with signs of arcing

Fig. 14: HV plug with signs of arcing

Fig. 15: HV insulator with signs of arcing

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31

HV plug installation at HV sockets

0

1. Prepare the high voltage connectors and test plugs.

Fig. 16: Silicon oil on HV plugs

Fig. 17: Silicon oil on HV plugs

• Check to ensure that the connector is clean and inspect it for damage. • Apply oil (supplied with the part) to the entire plug surface (left figure, item 1). ¹ Use about half of the oil from the tube for both plugs.

• Put oil into the new silicon insulator (item 2). • Install the silicon insulator part over the plugs (left figure, item 1) ¹ Ensure there is no air left in the silicon insulator.

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XRS 2. Prepare the high voltage connectors.

Fig. 18: Silicon oil on HV plugs

Fig. 19: HV sockets

• Check that there is no air left in the silicon insulator. • Insert the O-ring onto the HV plug (item 1). • Put oil onto the silicon insulator (item 2). • Insert the HV plugs into the receptacles. ¹ Verify the position of the plugs (+ or -).

• Install the O-ring into the HV socket as shown (right figure, arrow). • Hand-tighten the fastening rings. 3. Tighten the HV plugs.

Fig. 20: Tightening the HV plugs

• Tighten the HV plugs using the special tightening tool (delivered with the system) with a torque of 25 Nm.

High voltage tests

0

Description of available HV tests.

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33 HVC tube test For high tension arcing or HV breakdown, the test utility HVC tube test is available in the “Tube/Generator” test tools platform. The HVC tube test lets you apply high tension to the HV circuit without tube current. No test plugs are used in this test. No radiation is released during the test procedures. This test is performed before an HVC plug test is started because if this test does not indicate an error, the HVC plug test does not indicate an error either. Prerequisites Test needs system in the stand-by status. Performing the HVC tube test 1. Select Local Service > Test Tools > Tube/Generator 2. Select HVC tube. 3. Select voltage and repetitions. Follow the instructions in the dialog. 4. Click the hardware Start button at the control box. The test runs for 80 s. The test is terminated automatically. If the test fails, perform the HVC plug test described next to select which XRS part is defective. HVC with plug test For high tension arcing or HV breakdown, the primary test utility HVC plug test is available in the “Tube/Generator” test tools platform. The HVC plug test lets you apply high tension to the HV circuit without tube current and without a connected X-ray tube. This allows the HV circuit to be systematically reduced using test plugs to isolate a high tension error to either the Straton MX P tube, HV cable, or HV tank. No radiation is released during this test procedure. Prerequisites

• HV tank dummy plugs (normal type) > material number 16 21 791 • HV sockets dummy plugs (mini type) > material number 10 093 700 NOTE

The HVC plug test is only allowed with test plugs installed. Tests with the installed tube can result in misdiagnosis of errors. For a connected tube, use the HCV tube test.

Performing the HVC plug test 1. Follow the work steps followed to install the relevant test plugs in the HVT. a) Switch system to the COMP/ON status at the control box.

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XRS b) Press service hardware switch S1 in PDC. c) Remove the lower and open the upper front ring segment. Refer to (Open/close the upper front ring segment / p. 16) d) Remove the plastic ring and the funnel. e) Move the HV tank or the HV sockets to the 6 o‘clock position by hand. f) Disable gantry rotation with switch S301. g) Remove the HV plugs from the HV tank or the HV sockets and install the correct test plugs. ¹ HVT receptacles: When installing the test or HV plugs, new silicon disks must be used. h) Switch system on (S301 remains switched off). ¹ S301 has to be switched off because during Init the Rot FW searches for an index pulse. This behavior may result in a 360 degree rotation of the gantry. In this case the removed HV cables may damage parts in the gantry. 2. Select Local Service > Test Tools > Tube/Generator. 3. Select HVC with plugs. 4. Click “Go” on the virtual user panel. Follow the instructions in the dialog. Important work steps are listed below: 5. Click the hardware Start button at the control box. The test runs for 80 s. The test is terminated automatically. > If the test fails, follow the HV Troubleshooting Guides. NOTE

New silicon disks in the HVT must be used for the HV cable and test plugs before the plugs are installed into the components ( HVT).

6. Reinstall all parts removed/opened previously according the original configuration. ¹ Install the HV plugs at the HV sockets using new insulators. Tighten the HV plugs with a torque of 25 Nm. ¹ Install the HV plugs at the HV tank using 2 new silicon disks. Hand tighten the HV plugs at the HV tank.

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35

Filament (FIL)

2.4

TSG filament

0

The filament function is tested during “INIT” (e.g COMP/ON > SYS/ON). After switching the gantry off/on, a self test of the D770 (FIL power) in XGR is performed as step 1. In step 2, a filament current is sent to the filament heating in XRT (X-ray tube), passing the filament transformer at XRT. If the self test fails, the error message CT_GSA/GRA_111 (XGR FIL Self test Error) is sent to the Eventlog. Additionally a test utility “FIL” is available in the “Tube/Generator” test tools platform. During the “INIT” filament test, the involved D 700/D 770 board components in the XGR and the filament current to the XRT are tested (only in/out test). With the “FIL” test, the involved filament components and the filament regulation function are tested. So the “FIL” test is a more detailed test possibility. Remark: Test can be used when the system is or is not in stand-by status. Tab. 3

Filament test

Step

Action

1

• Switch gantry off/on using the control box (COMP/ON > SYS/ON) to perform an XGR INIT.

2

• Check in the eventlog for the error message CT_GRA_20 or CT_GRB_20 (XGR FIL self test Error). > if the error message was sent to the logbook during INIT > follow the Troubleshooting Guides given in the error message. > if the error message was not sent to the logbook during INIT > continue with item 3.

3

• Perform the “FIL” test function. > if the “FIL” test fails > change 1. XRT and 2. XGR assembly

Filament

0

Filament test This test checks the principal filament function and the regulation of the filament circuit including the power board (FIL-Power) in the XGR box, the cable connection to the XRT, the filament transformer at XRT, and the filament heating in the tube itself. No radiation is generated during this test procedure. Performing the filament test 1. Select Local Service > Test Tools > Tube/Generator. 2. Select FIL 3. Click GO and follow the instructions in the dialog. The test is terminated automatically.

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XRS

Anode rotation (RAC)

2.5

TSG Anode Rotation (RAC)

0

Use this test function to verify the RAC function. There are different anode speed (Hz) selections possible. In the Troubleshooting Guide below, 160 Hz is selected, because this value is very stressful for the RAC function (Note: Do not use this selection in quick succession to avoid overload). Use the RAC extended test function to check the rotating anode revolution with respect to the time (acceleration). The following statements are possible:

• No revolution > e.g rotating anode bearing defective, bad cable/plug connection, XGR...

• Revolution in the medium revolution range is too low > e.g rotating anode motor defective, XGR....

• Upper revolution range not reachable > e.g rotating anode bearing defective, XGR... Note: The system should be in stand-by status for this test.

NOTE

Tab. 4

Anode rotation on a Staton MXP tube may not be started without a functioning and connected cooling circuit (e.g. for troubleshooting).

Anode rotation (RAC) test

Step

Action

1

• Perform AnodeRot Frequency Local Service > Test Tools > Tube/Generator > RAC and select 160 Hz > if the RAC test fails > continue with item 2. > if the RAC test is ok > no further action.

2

• Perform AnodeRot Frequency Local Service > Test Tools > Tube/Generator and select the following RAC extended tests: 1. RAC anode movement test 2. RAC acceleration test 3. RAC maximum speed test

• If test 1 fails > continue with item 3 • If test 2 fails > continue with item 4 • If test 3 fails > continue with item 5

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37 Step 3

Action Possible cause of error: no revolution 1. Check cable connection W604/W654 between XGR (X6) > XTA (X2) for broken wire or bad contact. 2. Rotating anode motor defective > change XRT 3. XGR assembly defective > change XGR assembly.

4

Possible cause of error: revolution in the medium revolution range is too low 1. Rotating anode bearing defective > change XRT 2. XGR assembly defective > change XGR assembly.

5

Possible cause of error: upper revolution range not reachable 1. Rotating anode bearing defective > change XRT

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XRS

Single pulse test

2.6

Single pulse test

0

The single pulse test allows you to identify problems from the inverter assemblies up to the HV_Tank by triggering the inverters for a single pulse. Use the single pulse test after performing the TSG “High voltage” as a last step or if there is IMAX / UB MAX parameter information identified in an error message. Please use a memory oscilloscope to measure the output of the single pulse test. Tab. 5

Single pulse test

Step 1

Action Perform the single pulse test with normally connected tube. ¹ In addition to the given test result, check the UT_act value in the relevant test message in the Eventlog. If UT_act parameter is E: 0 x 50, 0 x 02, 0 x 57, 0 x 1B, 0 x.. 0 x.. 0 x 00, > test was successful. No problem on inverter part. f UT_act parameter is E: 0 x 50, 0 x 00, 0 x 4D, 0 x 09, 0 x.. 0 x.. 0 x 00, > test was not successful. Continue with item 2.

2

Perform the single pulse test with installed test plugs (#1621791) . Follow the dialog of the HVC plug test to install the test plugs ¹ In addition to the given test result, check the UT_act value in the relevant test message in the Eventlog. If UT_act parameter is E: 0 x 50, 0 x 02, 0 x 57, 0 x 1B, 0 x.. 0 x.. 0 x 00, > test was successful > X-ray tube problem > exchange X-ray tube. f UT_act parameter is E: 0 x 50, 0 x 00, 0 x 4D, 0 x 09, 0 x.. 0 x.. 0 x 00, > test was not successful. Continue with item 3.

3

Compare the output diagram of the scope, the enclosed example diagrams and tolerance values shown below. The time for a single pulse has to be 9 microseconds +/- 20%. The current must have a peak value of +170A +/- 20% or -170A +/- 20% (alternating). The tube voltage (UT_act) must have a peak value above 10kV. ¹ If the current is too high and/or the tube voltage is too low, check the MVT and HVT cabling (short circuit) ¹ If cabling is o.k. > replace parts in the following order: 1. MVT 2. HVT 3. Relevant inverter

Prerequisites

• Memory oscilloscope

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39 Performing the single pulse test 1. Move the XGS_Control assembly out of the PDC to get better access. NOTE

The power at the XGS control is 24 V and 5 V. Do not touch any parts on the XGS control. Connect the probes only as described below. Use a 3 channel scope to perform the measurements below. If only a 2 channel scope is available, measure UT_act first and then I_load to get the necessary information.

2. Connect scope: - Channel 1 - XGS D701 > X211 UT_act (1 V = 20KV) -> see (1/Fig. 30 / p. 54) - ANA_GND > XGS D700 > X87 ->see (6/Fig. 29 / p. 51) - Adjust scope to 1V/div - Channel 2 - XGS D701 > X5 I_load (1 V = 50A) -> (1/Fig. 30 / p. 54) - ANA_GND > XGS D700 > X87 -> see (6/Fig. 29 / p. 51) - Adjust scope to 1V/div - Channel 4 - XGS D700 > X104 N_Start_inv -> see (12/Fig. 29 / p. 51) - GND > XGS D700 > X112 -> see (12/Fig. 29 / p. 51) - Adjust scope to 5 V/div 3. Adjust scope - Time base 20 microseconds - Trigger channel 4 (neg. slope, single) 4. Select Local Service > Test Tools > Tube/Generator 5. Select Unset all in the generator application. 6. Select Single Pulse 7. Select path and click GO ¹ The test is terminated automatically. ¹ The time for a single pulse has to be 9 microseconds +/- 20%. ¹ The current must have a peak value of +170A +/- 20% or -170A +/- 20% (alternating). ¹ The tube voltage (UT_act) must have a peak value above 10kV.

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XRS

Single pulse test diagrams

0

The first 2 images are good examples; the last 2 images are error examples.

Fig. 21: Single pulse test diagram

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41

Fig. 22: Single Pulse test diagram

Error examples Short-circuit at the oscillating current cable (MV cable) in the HV tank

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XRS

Fig. 23: Single pulse test diagram

Short-circuit at inverter output

Fig. 24: Single pulse test diagram

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43

MVT cable check

2.7

The MV cable check is used to test the correct connection of the MV cables. The MV cables are routed from PDC_A/B > slip ring > HVT_A/B. A wrong connection of MV cable_A and MV cable_B destroys some XRS parts. Especially after system installation, moving the system or changing slip ring parts, use this test to check that the connection of the MV cables is correct. If the test is passed the MV cable connection is correct. If the test is failed, it is mandatory to find the reason for the error. Tab. 6

MV cable check

Step 1

Action Perform MV cable check A and B path. 1. if the test passes ok > MV cable connections path A and path B are correct. 2. if the test fails > check the complete connection from PDC_A/B over the slip ring to HVT_A/B. Use the actual function description as connection reference.

Performing the MVT cable check

0

1. Select Local Service > Test Tools > Tube/Generator 2. Select MVT cable check 3. Click GO and follow the instructions in the dialog. The test is terminated automatically. If the test fails > check the complete connection (PDC_A/B > slip ring > HVT_A/B) to find the problem.

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XRS

Arcing

2.8

The “Arcing” test is used from the lab to simulate arcings to verify that the FW/SW reaction due to arcings is correct. This test is not service-relevant.

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45

Check/adjust the tube oil pressure

2.9

The expansion vessel for the following measurement can be ordered from service stock. The part number for the vessel is: 10610161.

•

Allow the system to cool down for at least 10 minutes after the last scan. During the cooling time, the system must be switched on. ¹ Be aware that some system components may be very hot: the Straton tube, XTC, etc. may reach temperatures up to 130 degrees Celsius.

• Wait until the tube and the cooling system have cooled down, then switch the system to COMP/ON status at the control box.

• • • • •

Switch off the gantry power using the S1 service button in PDC A. Remove the gantry lower front ring segment. Turn the gantry by hand until the Straton MX P tube (A or B) is in the 6 o‘clock position. Secure against unintended rotation by using the front safety bolt. Prepare the expansion vessel.

Fig. 25: Adjusting unit for expansion membrane

• Install the adjustment handle (item 1) on the expansion vessel. - Press the button (item 2) to lock the thread rod on the membrane. - Hand-tighten the two screws of the adjustment thread rod (item 3).

• Open the quick coupling and disconnect the lower oil hose at the tube. Connect the oil hose from the expansion vessel to the empty quick coupling of the tube. NOTE

© Siemens, 2009 For internal use only

The pressure indicator at the expansion vessel shows the actual pressure in the oil circuit after the oil hose from the expansion vessel has been connected.

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XRS • Check/adjust the oil pressure.

Fig. 26: Adjusting the tube pressure

• Using the expansion handle (item 1), check the pressure at the pressure indicator (item 2) attached to the expansion vessel. The correct pressure is 1.25 bar (+/- 0.05 bar) + the altitude correction factor taken from the following table. ¹ The goal of the pressure adjustment is to have the correct oil pressure for all operating conditions. If the pressure is too low, arcs may occur during scans using the fastest anode rotation (e.g 160 Hz).

• If the system is located at a higher altitude than sea level > add the following correction factor to the sea level pressure (see following table). ¹ For example, if the altitude is 1000 m -> the correction value is 0.12 bar.

Altitude [m]

Difference [bar]

0

0.00

500

0.06

1000

0.12

1500

0.17

2000

0.22

2500

0.27

3000

0.31

3500

0.35

4000

0.39

4500

0.43

5000

0.47

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47 • If the pressure is not correct, adjust the membrane position using the adjustment handle (item 1).

• After the pressure adjustment is finished, remove the expansion vessel (remove the oil quick-snap connection to the XRT).

• Attach the second oil hose from the XTC again to the tube. • • • •

Unlock the safety bolt for gantry rotation. Rotate the gantry by hand and check for unusual noise. Close all covers opened before. Switch on circuit breakers F2, F3, F5, F6, F7, and F11 in the PDC A and F2 in the PDC B. ¹ First switch the F2, F3, F5, F6 circuit breakers to the “0” position and then to the “1” position.

• Switch the system to the SYSTEM/ON status at the control box.

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XRS

XRS hints

2.10

The following information is a summary of troubleshooting hints obtained through experience. Tab. 7

XRS hints

Step

Action

1

XGS_PDC control assembly controls the complete switching-on process of most system parts. If this part becomes defective, the system components do not switch on. For troubleshooting and to ensure that the system components are switched on again (in case the control assembly is defective) perform the follow work steps: 1. Check if all necessary voltages are available on XGS A/B > all green power supply LEDs on D790 must lit. ¹ If not > check/change XGS power supply. 2. Exchange the XGS_PDC control in the PDC in accordance with the “Replacement of parts PDC” instructions. After replacement, use the guided tour to perform necessary Tune-up steps. 3. After replacement of the XGS_control, make sure that the dongle plug (including the 120-ohm CAN bus resistor) is installed at plug X3.

2

The inverter 1 and inverter 3 cable connections can be exchanged for troubleshooting (both inverters are identical). 1. Remove inverter plug X23 (inverter 1) and X43 (inverter 3) from the XGS_PDC_Control backplane. 2. Install inverter plug X23 (inverter 1) in the X43 backplane plug and X43 (inverter 3) in X23 backplane plug on the XGS_PDC_Control backplane. ¹ If the error moves with the inverter > inverter is defective. ¹ If the error does not move with the inverter > inverter and inverter cable ok, check for other problems such as the cable connection, ground connection, or check for other error messages returned along with the inverter error message. Follow the instructions given in this message.

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49

Switching on status indicator of XGS

2.11

The seven-segment display on XGS board D700 (see image below) indicates the XGS status from system switch-on up to scan execute. This information can be used for troubleshooting.

Fig. 27: D700 measuring points and LED status

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50

XRS

Fig. 28: XRS Status

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51

Measuring points

2.12

Measuring points D700, D701, D702, D703

0

D700 measuring points

Fig. 29: D700 main board Tab. 8

Oscillating current and dose act. measuring points

item signal name short name

valid at

Description

measuring point

2

I_load_INV3 I_L_Inv3

XGS

Oscillating current inverter 3 / 1 V = 50 A.

X77

2

Dose_act

XGR

Actual dose value from fastlink X76 1 V = 13.107 value

Dose_act

* other similar values with D703 Fastlink control register selectable. Tab. 9

Supply voltage measuring points

item signal name short name

valid at

Description

measuring point

3

P15V

P15V

XGS

+ 15-V Voltage supply

X69

3

N15V

N15V

XGS

-15-V Voltage supply

X71

3

UDC

UDC

Sporadic error voltage

X73

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XRS item signal name short name

valid at

Description

measuring point

3

VCC

VCC

XGS

+ 5-V Voltage supply

X75

3

ANA_GND

ANA_GND

XGS

analog ground

X78

3

GND

GND

XGS

ground

X80

item signal name short name

valid at

Description

measuring point

4

VCC

VCC

XGS

+ 5-V voltage power supply

X75

4

ANA_GND

ANA_GND

XGS

analog ground

X78

measuring point

Tab. 10

Tab. 11

Ground measuring points

HW interrupt for ignition pulses main inverter

item signal name short name

valid at

Description

5

XGS

Ignition switch: HW interrupt of n.a. the ignition pulses from the main inverter. Normal position is off - V162 must be off. No function in XGR. Normal position is off.

S1

S1

NOTE

Tab. 12

The following measuring points are not implemented any more in newer systems. Nevertheless, the signals can still be measured on XGS D701 or D703 (see following pages).

Tube voltage measuring points

item signal name short name

valid at

Description

measuring point

6

P_UT act

P_UT act

XGR

Positive tube voltage 1 V = 10 kV.

X81

6

N_UT act

N_UT act

XGR

Negative tube voltage 1 V = 10 X83 kV.

6

UT_act

UT_act

XGR

Tube voltage 1 V = 20 kV.

X85

6

ANA_GND

ANA_GND

XGR

analog ground

X87

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53 Tab. 13

IT act. measuring points

item signal name short name

valid at

Description

measuring point

7

MA_meas_1 1

XGR

IT_act measurement point 1 for ampere meter.

X61

7

MA_meas_2 IT_nom

XGR

IT_act measurement point 2 for ampere meter.

X59

Measuring point

Tab. 14

Service switch

Item Signal name

short name

valid at

Description

8

S5

XGR

Switch must be on for IT_act n.a. measurements using an ampere meter at measuring points X46, X48, X50, X59, X61. LED V202 is on the when the switch is activated. Normal position is off.

item signal name short name

valid at

Description

measuring point

9

IT_act

IT_act

XGR

actual tube current

X48

9

IT_nom

IT_nom

XGR

Nominal tube current

X50

9

ANA_GND

ANA_GND

XGR

analog ground

X46

item signal name short name

valid at

Description

measuring point

10

VCC3.3

VCC3.3

XGS

+ 3.3-V I/O voltage FPGA

X20

10

VCCINT

VCCINT

XGS

+ 1.5-V core voltage

X44

item signal name short name

valid at

Description

measuring point

11

XGS XGR

Service switch: Switch has no n.a. function at this time. Nevertheless, the switch must be in the off position. LED V6 must be off.

Tab. 15

Tab. 16

Tab. 17

© Siemens, 2009 For internal use only

S5

IT act. measuring points

FPGA voltage measuring points

FPGA voltage measuring points

S2

S2

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XRS Tab. 18

FPGA digital out

Item signal name short name

valid at

Description

measuring point

12

N_Start_FIL _INV

FIL

XGR

Start FIL inverter (low active). Can only be used in XGR.

X100

12

N_Start_RA C_INV

RAC

XGR

Start RAC inverter (low active). X102 Can only be used in XGR.

12

N_Start_HV _INV

INV

XGS

Start HV inverter (low active).

X104

12

XC

XC

XGS

XC signal (X-ray request)

X106

12

XRAY_on

X-ray

XGS

X-ray on signal (> 20 kV)

X108

12

INV_Fault

Inv_err

XGS

Summary error HV inverter Can only be used in XGS.

X110

12

GND

GND

XGS XGR

Ground

X112

Tab. 19

FPGA digital out

Item signal name short name

Description

measuring point

13

DIP switches for debug and configuration of the FPGA - not for service use.

n.a.

S3/S4

n.a.

D701 HVC board measuring points

Fig. 30: D701 measuring points

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XRS

55 Tab. 20

D701 HVC board measuring points

Item signal name short name

valid at

Description

measuring point

1

UT_act

UT_act

XGS

Actual tube voltage (from rotat- X211 ing part over fastlink) 1 V = 20 kV

1

U_control

U_con

XGS

Set value for kV regulator

1

I_load_act

I_L_A

XGS

Actual oscillating current. 1 V = X215 50 A

1

USTU

USTU

XGS

Set value for kV regulator. X208 (Voltage control cycle). -5 V ... 0V

1

I_load_nom

I_L_N

XGS

Nominal oscillating current. 1 V = 50 A

1

UDC_act

UZ_act

XGS

Actual intermediate circuit volt- X210 age

1

ANA_GND

A_GND

XGS

analog ground

1

I_load

I_load

XGS

Oscillating current. 1 V = 50 A X5

1

UT_nom

UT_nom

XGS

Nominal tube voltage

X204

1

ANA_GND

A_GND

XGS

analog ground

X206

1

USTI

USTI

XGS

Set value for kV regulator (cur- X203 rent regulator circuit) 0 - 5 V

1

Upre_con

Upre

XGS

Set value for kV regulator (pre- X201 liminary control) 0 - 5 V

1

ANA_GND

A_GND

XGS

analog ground

X216

X207

X209

X200

D702 FIL/RAC board Tab. 21

D702 FIL measuring points

Item

signal name short name

valid at

Description

measuring point

D702

IT_act

XGR

actual tube current

X18

IT_act

max. 80 mA > 1 V = 100 mA 1 V = 80 mA D702

IF_act_1

IF_act_1

XGR

actual filament heating 1

X19

1 V = 0.273 A D702

IF_act_2

IF_act_2

XGR

actual filament heating 2

X20

1 V = 0.273 A

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56

XRS Item

signal name short name

valid at

Description

measuring point

D702

IF_act_3

XGR

actual filament heating 3

X21

IF_act_3

1 V = 0.273 A D702 Tab. 22

ANA_GND

A_GND

XGR

analog ground

X17

D702 RAC measuring points

board

signal name short name

valid at

Description

measuring point

D702

Test_DAC_1 DAC_1

XGS

FPGA controlled debug DAC

X10

D702

Test_DAC_2 DAC_2

XGS

FPGA controlled debug DAC

X11

D702

Res_sin

sin

XGS

Resolver Sine Signal

X12

D702

Res_cos

cos

XGS

Resolver Cosine Signal

X13

D702

RAC_P3

P3

XGS

RAC Current Phase 3 (1 V = 40 A, Offset 2.5 V)

X14

D702

RAC_P2

P2

XGS

RAC Current Phase 3 (1 V = 40 A, Offset 2.5 V)

X15

D702

RAC_P1

P1

XGS

RAC Current Phase 3 (1 V = 40 A, Offset 2.5 V)

X16

D702

ANA_GND

ANA_GND

XGS

analog ground

X17

D732 HV acquisition HVT (high voltage tank) measuring points Tab. 23

D732 HVT measuring points

Item

signal name short name

valid at

Description

measuring point

D732

ANA_GND

ANA_GND

XGR

analog ground

X12

D732

P_UT_act

P_UT_act

XGR

Tube voltage (pos.) (1 V = 10 kV)

X13

D732

N_UT_act

N_UT_act

XGR

Tube voltage (neg.) (1 V = 10 kV)

X14

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XRS

57

LED´s on D700, D701, D702, D703

0

D700 LED status

Fig. 31: D700 measuring points and LED status Tab. 24

D700 main board

board

signal name valid at

Description

LEDs

D700

S_FIL_INV

XGR

Start FIL Inverter. Only used in XGR.

V7

D700

S_RAC_INV

XGR

Start RAC Inverter. Only used in XGR.

V8

D700

S_HV_INV

XGR/XGS

Start HV Inverter (at XGR signal V9 delayed due to transport (fastlink) delay.

D700

Cycle LED

XGR/XGS

FPGA Life Cycle LED

V10

D700

XC

XGR/XGS

XC signal from system

V11

D700

XRAY_On

XGR/XGS

X-ray On Signal (UT_act > 20 kV)

V12

D700

INV_Err

XGS

Inverter Error

V13

D700

FPGA_Err

XGR/XGS

Error Interrupt from FPGA

V14

D700

MB 1000 mA XGR

IT_act measurement range 1000 mA

V15

D700

MB 100 mA

XGR

IT_act measurement range 100 mA (amplification *10)

V16

D700

MB 25 mA

XGR

IT_act measurement range 25 mA (amplification *40)

V17

D700

D_UT

XGR

Delta UT_act monitoring

V18

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58

XRS board

signal name valid at

Description

LEDs

D700

STOP

XGR/XGS

Stop report loop

V20

D700

UT_MAX

XGR

UT_act max. monitoring

V21

D700

A

XGR/XGS

System A on System B off

V23

D700

rot

XGR/XGS

rotating on, stationary off

V24

D701 HVC board Tab. 25

D701 main board

board

signal name valid at

Description

LEDs

D701

LED 1

n.a.

is not in use

V205

D701

LED 2

n.a.

is not in use

V206

D701

LED 3

n.a.

is not in use

V207

D701

LED 4

n.a.

HVC Error Interrupt

V208

D702 FIL/RAC Tab. 26

D702 main board

board

signal name valid at

Description

LEDs

D702

n.a.

XGR

FPGA out LED 0lim_1: Lim regulator FIL_1 active

LED_0

D702

n.a.

XGR

FPGA out LED 1 20peak_1: Peak regu- LED_1 lator FIL_1 active

D702

n.a.

XGR

FPGA out LED 2 20STOP_FIL/ STOP_RAC.

LED_2

D702

n.a.

XGR

FPGA out LED 3 20RAC_State_0.

LED_3

D702

n.a.

XGR

FPGA out LED 4 20RAC_State_1

LED_4

D702

n.a.

XGR

FPGA out LED 5 20HALL_A

LED_5

D702

n.a.

XGR

FPGA out LED 6 20HALL_B

LED_6

D702

n.a.

XGR

FPGA out LED 7 20FIL_Error_Int / RAC_Error_Int

LED_7

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59 D703 XG board Tab. 27

D703 main board

Item

signal name valid at

Description

LEDs

D703

LinkErr

XGS/XGR

Link Error

LED[5]

D703

LightErr

XGS/XGR

Light Error

LED[4]

D703

CfgErr

XGS/XGR

Config Error (FPGA not programmed)

LED[3]

D703

DefCfg

XGR

xray_and_not_door (XGR)

LED[2]

D703

RunCfg

XGS

door closed (XGS)

LED[1]

D703

Prg

XGR

door closed (XGR via Fastlink)

LED[0]

D703

LED 1

XGS

XGS_off (XGS indication when starting LED[6] inverter)

D703

LED 2

XGS/XGR

LifeCycle (flashes if FPGA is loaded)

LED[7]

D704 dongle board Tab. 28

D704 dongle board

board

signal name valid at

Description

LEDs

D704

VCC

XGS/XGR

Power supply 5 V

V1

D704

P_15V

XGS/XGR

Power supply 15 V

V2

D790 PDC board

Fig. 32: D790 signal LEDs

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60

XRS Tab. 29

D790 PDC board LEDs

board

signal name valid at

Description

LEDs

D790

P_24V_SNT

XGS

P_24V from switched power supply (only used for relays, feedback, and fans)

V1

D790

VCC_SNT

XGS

VCC (5 V) from switched power supply V2

D790

VCC3.3

XGS

FPGA IO voltage (3.3 V)

V3

D790

LED morse

XGS

FPGA Lifecycle LED (if LED flashes > FPGA is loaded and is functioning)

V4

D790

P_15V_SNT

XGS

P_15V from switched power supply

V5

D790

VCC_INT

XGS

FPGA core voltage (1.5 V)

V6

D790

N_15V_SNT

XGS

N_15V from switched power supply

V7

D790

P_15V_SNT _AUX

XGS

P_15V from switched power supply for inverter and fans.

V8

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61

Fig. 33: D790 PDC board signal LEDs Tab. 30

D790 PDC board LEDs

board

signal name valid at

Description

LEDs

D790

Main_Sw

XGS

PDC Main Switch Breaker Signal

V105

D790

Cooling_CB

XGS

Cooling Unit Breaker Signal

V117

D790

XGS

XGS

XGS Breaker Signal

V116

D790

PHS_CB

XGS

PHS Circuit Breaker Signal

V138

D790

Gan_Stat

XGS

Gantry Stationary Breaker Signal

V144

D790

Gan_Rot

XGS

Gantry Rotating Breaker Signal

V143

D790

UPS

XGS

UPS Breaker Signal

V157

D790

Insul_Power

XGS

Insulation Power Breaker Signal

V158

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62

XRS Tab. 31

D790 PDC board LEDs

board

signal name valid at

Description

LEDs

D790

Cooling

XGS

Cooling Unit Signal

V106

D790

PHS

XGS

PHS Signal

V118

LED off > trigger off and feedback off; LED on > trigger and feedback on; LED flashing > trigger and feedback different D790

D790

L2_Perm_Ga XGS ntry

L2 Gantry Signal

Charg_XGR

Charging XGR Signal

XGS

V119

LED off > trigger off and feedback off; LED on > trigger and feedback on; LED flashing > trigger and feedback different V139

LED off > trigger off and feedback off; LED on > trigger and feedback on; LED flashing > trigger and feedback different D790

PWR_XGR

XGS

Power XGR Signal

V145

LED off > trigger off and feedback off; LED on > trigger and feedback on; LED flashing > trigger and feedback different D790

IRS

XGS

V146

IRS Signal LED off > trigger off and feedback off; LED on > trigger and feedback on; LED flashing > trigger and feedback different

D790

ICS_Ether

XGS

V160

ICS Signal LED off > trigger off and feedback off; LED on > trigger and feedback on; LED flashing > trigger and feedback different

D790

Charg_XGS

XGS

Charging XGS Signal

V159

LED off > trigger off and feedback off; LED on > trigger and feedback on; LED flashing > trigger and feedback different Tab. 32

D790 PDC board LEDs

board

signal name valid at

Description

LEDs

D790

PWR_XGS

Power XGS

V107

XGS

LED off > trigger off and feedback off; LED on > trigger and feedback on; LED flashing > trigger and feedback different D790

Temp_Trans

D790

Power_CTRL XGS

SOMATOM Definition Flash

XGS

C2-030.840.01.08.02 08.11

Temp Transformer Signal

V120

Power Control Signal

V121

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XRS

63 board

signal name valid at

Description

LEDs

D790

Diff_Sw

XGS

Diff Switch Signal

V140

D790

Volt_Prot

XGS

Voltage Protection Signal

V147

D790

Current Loop XGS

Current Loop Signal

V148

D790

Door

Door switch Signal

V162

XGS

LED On: Door open (in PDC_B always on) D790

Fan Mode

XGS

Fan Mode

V161

LED On: low noise mode (15 V)

© Siemens, 2009 For internal use only

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SOMATOM Definition Flash

64 General

3DMS

DMS 30

Safety

0

WARNING

[ hz_serdoc_F13G01U12M03 ]

Avoid accidents and injury or damage to parts. Risk of accident or injury! ¹ Read and observe the safety information contained in the “General” section of this document and/or the “Product specific safety notes”. NOTE

Follow ESD guidelines when handling the DMS.

NOTE

Always close DMS covers prior to rotating the gantry!

Notes

0

NOTE

There are 2 Scatter monitors on each module of the Definition Flash.(Fig. 34 / p. 77)

The following table shows the used DMS modules depending on DMS type: DMS type

Spare part module

DMS A 10393100

10393079

DMS B 10393150

10393079

DMS A 10393200

10393091

DMS B 10393210

10393091

1. Before starting troubleshooting, be sure you troubleshoot the right area. - To distinguish between the DMS’s and IRS, check the data path first - To distinguish between DMS A and DMS B, run the DMS tests and check if the errors are related to DMS A or DMS B. - To distinguish between DMS A and DMS B, especially if image quality problems appear in Dual source modes, it is useful to use the 20 cm water phantom approx. 10cm excentrically. - To distinguish between module and module cable, it is possible to swap the whole module cable with a neighboring one. If the error moves when swapping the whole cable, the problem is related to the module cable.

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DMS

65 - To distinguish between module and backplane, it is possible to cross the module cable at the backplane NOTE

A second peak may appear in the displayed plot (e.g. in signal value) with module cables crossed or swapped. This is normal if no new calibration (e.g. a new Checkup or Setup/Calibration) has been performed prior to starting a new scan.

If the error moves when crossing the module cables at the backplane, the problem is related to the module or module cable. 2. If possible, use the test modes with rotation for troubleshooting especially in case of noise problems.

Definitions and abbreviations

0

n.a.

Prerequisites

0

1. Check environmental conditions (especially in case of weak rings) 2. Check for objects in the scan field, e.g., contrast agent, labels,... 3. Try and reproduce an image the customer has complained about using the same parameters 4. Use ROI/Ring and note the positions as a reference for the position expected to contain the defect (two positions are possible).

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66

DMS

TSG Image Quality

3.1

This chapter provides a basic overview of different types of image quality problems and a useful way for starting troubleshooting.

General

0

NOTE

Most of the image quality problems are related to defective channels within a detector module. That is why troubleshooting should start with defective channel detection. This chapter is sorted for different types of image quality problems and should guide you. The DMS tests are described later in this chapter.

Possible reasons for ring and band (mostly 4, 8, or 16 channels) artifacts are:

• Defective detector element • • • • • • • •

Defective detector cable Defective backplane Insufficient calibration (e.g. contrast agent at plexiglas ring) Insufficient tune-up tables Problem with balancing (reconstruction) Insufficient environmental conditions Defective IRS Bands covering 16 channels might be caused by the incorrect Z-position of one module. Run Z-position check of module. NOTE

Problems related to a single slice appear as permanent rings in sequence modes, and as partial rings in spiral scans.

Possible reasons for streak artifacts are:

• Defective detector module • Patched channels • Alignment adjustment • Tube arcing Possible reasons for other artifacts, e.g. pattern in image, inhomogeneous areas are:

• • • •

The tube The tube-side collimator UHR comb The tube cooling system

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67 • The DMS power supply NOTE

If the DMS covers and parts have to be removed during troubleshooting, follow the instructions in the “Replacement of Parts” section for detailed information on how to remove and install DMS parts. Never start gantry rotation with the DMS covers removed.

TSG strong rings

0

In most cases we suspect that the detector module is defective.

NOTE

Offset/noise values of an entire backplane that are out of tolerance indicate a defective DAS Controller or the cable between the DAS Controller and the signal backplane (black/blue) cable. Handle these cables carefully.

Tests which typically show problems in case of strong rings are:

• Offset Value • Signal value Start troubleshooting as follows: Tab. 33

TSG

Step

Action

1

• Use ROI/Ring to determine the area of the defect in the customer image

2

• Check for entries of defective channels in the reports. Refer to the section for defective channel detection.

3

• Compare the entries in reports to the channels you found with ROI/Ring. a) if entries are related to the customer image -> patch out the channel manually. Refer to the section for defective channel detection. b) If no channel is related to the customer image, -> continue with step 4.

4

• Run the defective channel detection in the Tune up platform. a) if problem is solved -> Perform scans with the 20cm water phantom (also excentrically) to check the image quality. b) if not o.k., e.g., too many bad channels found, -> continue with step 5.

5

• Run Guided Tour for image quality. a) If there are errors found in one or more tests, -> continue with step 6.

6

• If only one channel is found to be defective, -> patch out the channel manually and check reports to see whether the defect has remained in the system.

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68

DMS Step

Action

• If neighboring channels, channels in detector centers, or channels which

7

cannot be patched out are defective, -> continue with step 8.

• Cross the module data cable on the backplane with the neighboring

8

module cable to distinguish between the module and the backplane.

• Close all DMS covers. Repeat the tests which showed errors before and check if the error moved. a) If the error is still in the initial position -> replace the backplane. b) If the error moves to a neighboring slot -> module or module cable defective, continue with step 9.

• Swap the complete module data cable with the neighboring module data

9

cable to distinguish between the module and the module data cable.

• Close all DMS covers. Repeat the tests which showed errors before and check if the error moved. a) If the error is still in the initial position -> replace the module. b) If the error moved to a neighboring slot -> replace the module cable.

• Check the cables DCON => backplanes.

10

Especially if the errors are related to an entire backplane, -> check/swap the black-blue cables between the DAS Controller and the signal backplanes. Handle these cables gently!

TSG sporadic strong rings

0

Ask the customer to perform a Checkup in case of problems. Start troubleshooting as follows: Tab. 34

TSG

Step 1

Action

• Ask the customer to save the image in case of problems. a) The image is important for further evaluations with ROI /Ring.

2

• Ask the customer to perform a check-up in case of problems. a) This particular (automatically generated) check-up table can be used for further defective channel evaluations.

3

• Use the ROI/Ring to determine the area of the defect in the customer image.

4

• Check for entries of sporadic channels in the reports. Refer to the section for defective channel detection.

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69 Step 5

Action

• Compare the entries in reports to the channels you found with ROI/Ring. a) If sporadic entries are related to the customer image -> patch out the channel manually. Refer to the section for defective channel detection. b) If no channel is related to the customer image, -> continue with step 6.

6

• Run the defective channel detection in the Tune up platform. a) if problem is solved, -> Perform scans with the 20cm water phantom (also excentrically) to check the image quality. b) If not o.k., e.g., too many defective channels are found, -> continue with step 7.

7

• Run Guided Tour for image quality. a) If there are errors found in one or more tests, -> continue with step 8. b) If no errors are found, -> continue with step 9.

8

• If one channel is indicated as defective, -> patch out the channel manually.

9

• Use reports and check for irregularities within the tests, especially in the area of the defect in the customer image.

• If irregularities are present, cross the module data cable on the backplane with neighboring module data cable.

• Close all DMS covers. Repeat the tests which showed irregularities before. a) Check reports again. If irregularities moved for 16 channels, -> replace the module including the module cable/s. b) If no difference is visible, swap back the data cable and close all DMS covers. c) Run a Checkup and check Reports for defective channels again. 10

• Contact HSC for further steps.

TSG weak rings

0

A ring is visible in homogeneous areas such as the cerebrum, even if the difference compared to the neighboring channel is very small. In most cases we expect the stability of the element affected to be insufficient. Tests which typically show problems in case of weak rings:

• BaseCal stability • Signal linearity Start troubleshooting as follows:

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70

DMS Tab. 35

TSG

Step

Action

1

• Check environmental conditions

2

• Ensure that the DMS was powered on overnight.

3

• Check that the Tune-up was performed correctly (use Report function).

4

• Use ROI/Ring to find out the area of the defect in the customer image

5

• Check for entries of sporadic channels in the reports. Refer to the section for defective channel detection.

6

• Compare the entries in reports to the channels you found with ROI/Ring. a) If entries are related to the customer image, -> patch out the channel manually. Refer to the section for defective channel detection. b) If no channel is related to the customer image, -> continue with step 7.

7

• Run Guided Tour for image quality. a) Compare test outputs to channels you found in the customer image with the ROI/Ring function. b) If only one channel is defective, -> patch out the channel manually. c) If neighboring channels, channels in detector centers, or channels which cannot be patched out are defective, -> continue with step 8.

8

• Cross the module data cable on the backplane with the neighboring module data cable.

• Close all DMS covers. Repeat the tests which showed errors before and check if errors move. a) If the error is still in the initial position -> swap back data cable and continue with step 9. b) If the error moved to the neighboring slot, -> module or module data cable unstable/defective, continue with step 9 and step 10 prior to replacing the module. 9

• Check the power path. Refer to “TSG DMS Power Path” a) If the power path and the DMS Power supply are o.k., -> continue with step 10.

10

• Perform Guided Table Generation in Tune up platform. Note: Table Generations are performed. a) If still not o.k. -> contact HSC for further steps.

TSG sporadic weak rings

0

In case of sporadic weak rings, perform TSG weak rings first. Additionally, start troubleshooting as follows:

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71 Tab. 36

TSG

Step 1

Action

• Ask the customer to save the image in case of problems. a) The image is important for further evaluations.

2

• Ask the customer to perform a checkup in case of problems. a) This particular checkup table can be used for further basecal evaluations.

3

• Use the ROI/Ring to determine the area of the defect in the customer image.

4

• Run the DMS Test Offset Value and check for irregularities in the offset and noise plots.

5

• Perform the BaseCal Stability Test. A difference between a satisfactory and unsatisfactory Basecal table will show the problem. a) If only one channel is noted, -> patch out the channel manually. b) If neighboring channels, channels in detector centers, or channels which cannot be patched out are noted -> replace the corresponding module.

TSG rings in outer slices only

0

Rings visible in the outermost slices may occur only in case of collimation problems. Start troubleshooting as follows: Tab. 37

High voltage TSG

Step 1

Action

• Run the defective channel detection in the Tune up platform. a) If more channels or an entire row of channels are out of tolerance, -> continue with step 2. b) If only one channel is defective, -> continue with step 5.

2

• Run Module Z-Alignment. a) If out of tolerance, check the mechanical positioning of the module. Refer to the replacement of parts section for instructions. b) If in tolerance, -> continue with step 3. Additionally, run modes with 24 x 1.2 mm and 32 x 0.6 mm to check if the error occurs at the same physical slice position.

3

• Run Z-Adjust in the Tune up platform. a) If out of tolerance, troubleshoot the tube collimator. b) If in tolerance, repeat defective channel detection. Additionally, continue with step 4.

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72

DMS Step

Action

• Check slice thickness to ensure Constancy.

4

a) Run Quality Constancy, check results for slice measurement.

• Run TSG strong rings

5

TSG Streak artifacts

0

1. Intermittent streaks tangential to a circle might be caused by a defective module Start troubleshooting as follows: Tab. 38

TSG

Step

Action

1

• Run the defective channel detection in the Tune up platform.

2

• Run TSG strong rings

2. Streaks tangential to a circle may be caused by unstable detector channels. Start troubleshooting as follows: These kind of errors can also be caused by bad contact of the module data cables. Check these cables during troubleshooting (reconnecting and swapping the data cables). Tab. 39

TSG

Step

Action

1

• Run the defective channel detection in the Tune up platform.

2

• Check if there are adjacent patched channels and continue with step 3.

3

• Check reports for defective channels. a) If “-> must be changed” is written in the reports, replace the corresponding module. b) If “-> critical” or is written in the reports, compare the entries to the area of defect in the image. If this is identical, replace the module. If not -> continue with step 4.

4

• Run TSG strong rings

3. Fine streak artifacts not correlated tangentially to any circle may be caused by incorrect alignment. Start troubleshooting as follows:

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73 Tab. 40

TSG

Step

Action

• Run a “MTF measurement” in quality constancy and check for tolerances.

1

a) If in tolerance, -> continue with step 2 and step 4. b) If slightly out of tolerance, -> continue with step 2. c) If results are not plausible, go directly to step 3. d) If only UHR modes are out of tolerance, -> continue with step 4.

• Run the focus alignment check in the Tune up platform.

2

a) Continue with Focus Alignment in the Tune up platform. Note: Continue with Focus Alignment as well, if the Focus Alignment check is in tolerance. If Focus Alignment fails, -> continue with step 3. 3

• Troubleshoot tube collimator (PSD) and Focus deflection.

4

• Run comb ali.

5

•

Run TSG weak rings.

4. streak artifacts not correlated to any object may also be caused by tube arcing. Start troubleshooting as follows:

• Tube arcing ¹ Check the tube history for this particular scan to see if tube arcing was detected. Getter tube

TSG Dual Source problems

0

Notes:

• Image quality problems in dual source modes appear most often as a band in the area where the scan field of the DMS B is extended by the outer channels of DMS A. In dual source modes the inner area of the scan field are measured by both DMS’s, the outer area of the scan field is measured by DMS A only. Measure the HU in the area of the band. Especially in case of a high absorption (obese patients), a high difference in HU can be measured in the inner and outer area of the scan field. NOTE

For troubleshooting dual source problems, it is very helpful to use the 20cm water phantom positioned approx. 10 cm excentrically.

• Start troubleshooting as follows:

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DMS Tab. 41

TSG

Step 1

Action

• Check if the problem is caused by one of the DMS’s, or if the problem appears only in dual source modes. a) Run single source modes (B-modes) in the Rot mode platform and use the 20 cm water phantom (also excentrically). If the images are free of artifacts, -> DMS B is ok. If the images show artifacts, troubleshoot the DMS B first. Refer to the corresponding TSG in this document. b) Run single source modes (A-modes) in the Rot mode platform and use the 20 cm water phantom (also excentrically). If the images are free of artifacts, -> DMS A is ok. If the images show artifacts, troubleshoot the DMS A first. Refer to the corresponding TSG in this document. c) Run dual source modes (A/B-modes) in the Rot mode platform and use the 20cm water phantom positioned approx. 10cm excentrically. If artifacts appear in the area where DMS A adds DMS B data, -> the problem is related to dual source modes only. Continue with step 2.

2

• Check if the problem is caused by incorrect scatter radiation correction. a) Run a dual source mode (A/B-modes) in the Rot mode platform with Cross Scat selected (use the 20cm water phantom positioned approx. 10cm excentrically). b) Run a dual source mode (A/B-modes) in the Rot mode platform with Cross Scat deselected (use the 20cm water phantom positioned approx. 10cm excentrically). With Cross Scat selected, the critical area (at approx. 32 cm) must look more homogeneous. If no difference is visible, the correction is wrong or not working. -> Continue with step 3.

3

• Run quality constancy and check homogeneity. a) If homogeneity is out of tolerance -> Run Water Scaling for the corresponding DMS (A or B).

4

• Perform Guided Table Generations in the Tune up platform. Call HSC for further advice. Note: Table Generations for DMS A and DMS B are performed. (approx. 2 hours) a) If still not o.k. -> contact HSC for further steps.

TSG Spatial Resolution (bad MTF results)

0

Start troubleshooting as follows:

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75 Tab. 42

TSG

Step 1

Action

• Run a “MTF measurement” in quality constancy and check for tolerances. a) If slightly out of tolerance, -> continue with step 2. b) If the results are not plausible, continue directly with step 3. c) If only UHR modes are out of tolerance, -> continue with step 4.

2

• Run Foc. Align. check in the Tune up platform. a) Continue with Focus Alignment in the Tune up Platform. Note: Repeat Focus Alignment as well, if the Focus Alignment check is in tolerance. If focus alignment fails, -> continue with step 3.

3

• Troubleshoot the tube including the tube collimator and the regulation circuit.

4

• Run Comb Ali in the Tune up platform.

TSG other artifacts

0

Pattern across the entire image

• Perform tests or test images with and without X-ray to find out if the problem is related to radiation. Additionally, run Guided Tour for image Quality. If the problem is related to radiation: ¹ - Check (replace) tube - Check (replace) tube collimator If the problem is not related to radiation: ¹ - Check the DMS power supply - Check the modules at slots 1 and 46 (air slice normalization) Inhomogeneous areas To identify the source of the problem, evaluate the BaseCal values (contact CS HSC). The reasons for inhomogeneous areas in the image (with radiation) are mainly:

• Defective BaseCal tables (visible mainly in the cerebrum sequence): If calibration was performed with an absorber (contrast media) in the scan field: The artifact is stable (in the same image area) in all images. ¹ Check the reports for entries. (Options > Service > Local Service > Reports ) ¹ Clean the plastic ring and check for other absorbers in the scan field. Repeat calibration. Inhomogeneous slices If the mean value (of the same image area) differs from slice to slice :

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76

DMS ¹ Check the modules of slots 1 and 46 in DMS A (air slice normalization)

NOTE

The task of air slice normalization is to equalize all slices. Some of the channels of the modules in the first and last slot (1 and 46 in DMS A) are used to calculate a mean value for each slice. All slices are now compared and equalized.

Poor image quality due to wrong scan parameter or usage There are also non-technical reasons for certain types of image quality problems.

• Windmill artifact If you browse through a stack of images, the image contains an artifact that moves like a windmill. It is especially visible at the edges of bones. Windmill artifacts occur due to undersampling or interpolation. ¹ Compare the pitch used with the Siemens default values. ¹ Check if the reconstructed slice width is 1.25 times the collimated slice width. ¹ Involve Applications in troubleshooting

• Artifacts due to patient positioning or use of positioning aids. (mainly streaks) Head: ¹ Check to see if the correct head holder was being used. Body: ¹ When using the CT-slicker, bend the edges down and glue them to the table

Tests for Image Quality

0

This chapter provides a list of all software tools available for handling DMS problems. ROI/Ring Scope

• The ROI function (region of interest) is used to calculate the mean value and the standard deviation of a user-defined area.

• The Ring function shows the correlation of a position in an image to 2 possible channels in the DMS that have been involved in creating data at that position. How to find it

•

Options > Service > Local Service > Test Tools > ROI/Ring

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77 How to use 1. Select the desired order for sorting the images in the list box by activating the corresponding radio button. (You may have to wait.) 2. Mark the image of your choice in the list box. Select the image by double-clicking or use the Load Loid button. ¹ The image will be displayed The Switch to File Chooser button enables loading of images from different locations. 3. Select the radio button Ring 4. Use the left mouse button to move the ring to the desired position. Use the center mouse button for windowing. ¹ Read out the 2 possible channels (channel1, channel2) causing the problem. ¹ Use this information as the basis for additional troubleshooting. Defective channel detection The software automatically detects bad channels. This includes also the scatter monitors attached to the modules (see item 1). The scatter monitors are no separate spare part. In case of a defective scatter monitor, replace the module. In DMS A 46 modules and in DMS B 30 modules with 16 channels each are installed. If a scatter monitor is defective, that is shown in the Defective channel history. The following image shows the scatter monitors installed at the first Version of modules: (Spare part compl. module: 10393081)

Fig. 34: Scatter monitors at detector module

The following image shows the scatter monitors installed at the newer Version of modules: (Module kit compl. 10393079)

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DMS

Fig. 35: Scatter monitors at new type of detector modules

The center of the DMS and the first and last slot (used for air slice normalization) have to have no defective channels. In all other slots, a certain number of defects is allowed. 1. Event Log Critical defects are also written in the Event Log message: CT_TUN_164. 2. Check for allowed defects under Reports - Using the Report function: Options > Service > Local Service > Reports > Tune Up > Table Generations > Def Channels. NOTE

If you find “=>must be changed” within the reports, the defect cannot remain in the system and the module has to be replaced.“Critical” modules shall only be replaced if these modules cause artifacts. “Tolerable” modules are not to be touched. Always compare the entries within the defective channel history to the area in the image with the quality problem.

¹ Shows status of last defective channel detection during check up. - Options > Service > Local Service > Reports > Def. Chann. History. ¹ A history of all channels that have been patched or unpatched is shown. - “Smart detection” to eliminate sporadic channels If a defective channel is detected during checkup, the stability value for the corresponding channel is set to “50” and the channel is patched out. If this channel is still defective during the next checkup, the stability value changes from “50” to “100” and is still patched out. If the channel is ok again, it is still patched out, but the value decreases from 100 to 90 ...80...70... and so on, during every following checkup until “0” is reached and the channel is unpatched. If the channel is “bad” again, the stability value increases by “50” (to a maximum of “100”).

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79 - If no defect corresponds to the customer image, run the automatic defective channel detection in the Tune-up platform. Refer to “Defective channel detection in tune up platform” (item 3) - If a scatter monitor is broken, it is indicated as “S-Mon” under “Collimation” and the number of the corresponding module is displayed under “Channel” 3. Performing Defective Channel Detection in the Tune up Platform -

Select Local Service > TuneUp > Expert Mode > Defective Channels. Remove all absorbers. Select Scan Mode Click Auto.

¹ To repeat automatic detection in case of unstable / implausible results, repeat the procedure with the auto button. - You will be asked to accept the current calibration. - Click Save. ¹ The IRS tables are transferred to the IRS. ¹ If you click Cancel, no modifications to the tune-up and IRS tables will be stored. - Check the Reports to determine whether a defect has been found and successfully patched out. - The program is not sensitive enough to detect all kinds of defects. If a defect is not found during the procedure, the DMS tests are necessary. NOTE

If a defect was found and successfully patched out during the procedure, the images must be free of artifacts now.

4. Editing the correction tables - Select Local Service > TuneUp > Expert Mode > Defective Channels. - Click the button for the desired detector slot. Remark: A segment containing unsatisfactory elements is marked in red. - After a while, the user interface will show the corresponding channel / slice matrix. ¹ Now select the desired channel and slice. Select the element with the left mouse and click it. The color will change from green to red. ¹ Left-click to remove an unsatisfactory channel entry. The color will change from red to green. - Click save after modifications. - Click save after modifications. - For additional information regarding defective channel detection, refer to “Hints for defective channel detection”. Common for all tests which provide a plot function NOTE

© Siemens, 2009 For internal use only

The following is a plot from a Somatom Definition. The DMS A in the Somatom Definition Flash has 736 channels, and the DMS B has 480 channels.

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DMS

Fig. 36: Example of Relative Signal Value DMS A in error condition

• Common for all tests which provide a plot function for the results: - The button Show Plot shows the graphical output of the table. Select all slices via Show All, none via Hide All, or a single slice via the list box. Zoom in (or out via Survey) using the left mouse button. Mark the area of interest while holding down the left button. Then press Zoom In . Position the cursor at the desired location and wait for the display of: - channel - slice - value at that position The button Statistic displays the following for all slices: Minimum, Maximum, Mean, and StdDev. The min. and max. values are shown only if the checkbox Y-Auto Scale is not marked.

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81 - The button Extract to file is used to store the result of the test to c:\Somaris\ service\extract\DmsTestExtract.txt Remark: If you want to store more than one file, you have to manually change the file name. - The display of the tolerances in the plot may be switched on or off using the checkbox for Tolerance

• Tolerances are available for all test results. NOTE

The Tolerance limits are indicated by red lines in the plot.

As a result, test result pages display the following at the top of each page: OK for tests passed or Not OK for tests failed.

• In case of values out of tolerance, the slice and channel are output. Click the channel number and read out: Channel xxx and Slot xx. Guided Tour for image quality Scope

• The Guided Tour is an automatic sequence containing most of the DMS tests available at the system. How to find it

• Options > Service > Local Service > Test Tools > Image Quality How to use 1. Press Go NOTE

Offset value starts automatically after pressing the Go Button.

2. Wait for Press START key to appear and then press the Start button. 3. Wait for the results. - Check if the test results match the artifact which you localized before with ROI/Ring. Return to the TSG image quality. Offset Value Scope

• This test is used to check the mean values and noise without X-ray. How to find it (if not using the guided tour)

• Options > Service > Local Service > Test Tools > DMS > Offset Value

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DMS How to use 1. Select the desired mode. 2. Press Go 3. Wait for the result ¹ Replace modules that exceed the threshold 4. Description of the result page The results of the test are shown in two tables: - Offset Value - Offset noise Both tables show Slice, Minimum, Maximum and Test Result. Use the Show Plot button to display the plots. Signal value Scope

• This test is used to check the mean values and noise with X-ray. Different collimations are used. How to find it (if not using the guided tour)

• Options > Service > Local Service > Test Tools > DMS > Signal Value How to use 1. Select the desired mode 2. Wait for Press START key to appear and then press the Start button. 3. Description of the result page The results of the test are shown in three tables: - first table: Relative Signal Value The result shows the averaged signal of the channels in relation to the neighborhood. This table shows Slice, Minimum, Maximum, and Test Result. - second table: Relative Standard Deviation This table shows Slice, Minimum, Maximum, and Test Result. In addition, the monitor value is shown. - third table: Absolute Signal Value This table shows Slice, Minimum, Maximum, and Test Result. In addition, the monitor value is shown. Common for all tables is:

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83 - The button Show Plot graphically displays the table. It is possible to select all slices via Show All, none via Hide All, or a single slice via a checkbox. It is also possible to Zoom In (or out via Survey) by using the left mouse button. Mark the area of interest while holding down the left button The button Statistic displays the following for all slices: Minimum, Maximum, Mean, and StdDev. The checkbox Y-AutoScale allows automatic scaling of the Y-axis. - For values out of tolerance, slice and channel are output. Click the channel number and read out: Channel xxx and Slot xx. - The button Extract to file is used to store the result of the test to disk. BaseCal Stability Scope

• The main function of the BaseCal stability test is to subtract the last two BaseCals of one given mode in order to find unstable channels. The structure of the BaseCal names is: basecal_slice_ tube voltage_ scantime_ focus size_algorithmn_organ_focus type. They are stored in c:\Somaris\service\datastore\icstables How to find it (if not using the guided tour)

• Options > Service > Local Service > Test Tools > Sys. Test > BasCal Stability How to use 1. Select the desired mode. 2. Use the BaseCal corresponding to the mode the customer is complaining about. 3. Press Go ¹ The result page is shown. ¹ Before exchanging modules, compare the result with the results of ROI/Ring to verify whether the customer’s image problem has been located. 4. Activate Show Plot ¹ Evaluate the plot In addition to the standard functions, you can define the Segments which should be shown. Remark: A BaseCal is referred to as a 360 degree rotation and is divided into 10 angular segments.

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DMS Signal linearity Scope

• This test performs two scans with different tube currents (100mA and 300 mA). Subtracting the mean values of these scans shows the deviation caused by the signal non-linearity. In addition, you may use phantoms in the scan field to check the low signal linearity. How to find it (if not using the guided tour)

• Options > Service > Local Service > Test Tools > DMS > Signal Lin. How to use 1. Wait for the Press START key to appear and press the Start button ¹ The test result page is displayed. ¹ In case channels are out of tolerance, change the corresponding module. 2. Press Show Plot ¹ The plot is displayed Assignment test Scope

• The assignment test is an internal addressing test of the DAS controller and the outgoing data path. How to find it (if not using the guided tour)

• Options > Service > Local Service > Test Tools > DMS > Assignment How to use 1. Select the desired mode. 2. Wait for the Press START key to appear and then press the Start button ¹ Wait for the result page 3. Activate Show Plot ¹ A continuous staircase from upper left to lower right should be visible for all slices. Remark: In addition to the standard function, you can define: - Segments (frames) and - FFS 1, 2 or all 4. Interpretation of the result The possibly defective part: - DAS Controller

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85 Data Link test Scope

• The Data link test is a communication test for the data paths. How to find it (if not using the guided tour)

• Options > Service > Local Service > Test Tools > Sys. communication > Datalink How to use 1. For complete auto test select all modes. 2. Press Go 3. Wait for the Result and press Done or Repeat the test. ¹ If the result is out of tolerance → Check for data transmission errors → Troubleshoot the data path Resend Scope

• The Resend test is used to check the Data resend mechanism. Number of resends is checked. How to find it

• Options > Service > Local Service > Test Tools > Sys. communication > Resend How to use 1. For complete test select Detector System A and B 2. Press Go 3. Wait for the Result. ¹ If the result is out of tolerance → Check for DMS related errors X-ray Path Scope

• This test involves finding any “contamination” in the X-ray path. A scan is performed and the 2 focal spots are subtracted. The plot's appearance will vary depending on the position of an object in the X-ray path. Two peaks are displayed.

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DMS - If the object is near the detector, the distance between the two peaks will be small. - If the object is near the tube (or tube collimator), the distance between the two peaks will be large. How to find it (if not using the guided tour)

• Options > Service > Local Service > Test Tools > Sys. Test > X-ray Path How to use 1. Select the desired mode. 2. Wait for the Press START key to appear and then press the Start button. ¹ The test result page is displayed. ¹ If channels are out of tolerance, contact CS HSC for further advice. 3. Press Show Plot to see the plot ¹ Capture the plot and supply it to CS HSC for additional evaluation. Tube Collim. Check Scope

• This test checks the correct opening width and Z-position of the tube collimators. IRS tables are used, which have been generated during air calibration. No scans are performed during this check. How to find it

• Options > Service > Local Service > Tuneup > Expert Mode > Tube Collim. Check How to use 1. Press Go 2. Wait until the message “Tube collimator Check completed” appears. ¹ If the result is out of tolerance → Perform a tune-up. Follow the guided tour for Tube Collimator → Troubleshoot the tube collimator and the regulation circuit (UMAR). Focus alignment check Scope

• This test uses the ball phantom to check, if the electromagnetic focus deflection (flying focal spot) in the PHI and in the Z-position is working properly. How to find it

• Options > Service > Local Service > Tuneup > Expert Mode > Foc.Align.check

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87 How to use 1. Select System A / System B or both in the platform. 2. Press Go 3. Select and insert phantom. 4. Press Go 5. Wait for the Press START key to appear and then press the Start button. 6. Wait for the results. ¹ If the result is out of tolerance → Repeat the test to find out, if the result is failing continuously. → Perform Z-Adjust and Focus Alignment and repeat the test. → Run the Guided Tour for X-ray tube Tune up. → Exchange X-Ray Tube Note: Contact CS HSC before ordering the tube. ¹ If the result is not plausible → Check if the Focus Alignment was performed after tube replacement. → Troubleshoot the tube collimator and focus deflection. Module Z alignment Scope

• It is possible to locate the modules in the wrong position during replacement. An automatic module position check is implemented in the guided tours. Follow the software instructions in this case. The Z-alignment of the module is tested by evaluating 2 air scans with different tube collimator positions. How to find it

• Options>Service>Local Service>Test Tools>DMS>Module Z-Align How to use 1. Press Go 2. Wait for Press START key to appear and then press the Start button. ¹ The test result page is displayed. 3. Press Show Plot 4. Check if there is a drop of 16 channels (use the Zoom function), especially at the position where you performed repairs. If yes, loosen the module exchanged previously and press it toward the rotating plane while you are fixing the situation. Repeat the test.

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DMS Analyze Scope

• Analyze is a versatile tool, used to evaluate raw data as well as header data. The following functions are useful for field services: - Integration time - Dose monitor - DMS Temperatures - Raw Data Frequency Analysis How to find it

• Options > Service > Local Service > Test Tools > Analyze How to use

• Using the macros under Special 1. Select the radio button ICS-RawData 2. Mark the desired raw data set in the list box 3. Press Go, select Raw data under File content and Press Go again. ¹ View is automatically selected and the plot appears. 4. Select Special 5. Mark the desired checkbox - ReadingNo - TubeAngle - MaximumValue - ErrorInfo - CRC Error - IntegrationTime - Dose monitor - DMS-Temperature 1...n and press Go ¹ The corresponding curve is displayed.

• Using the raw data frequency analysis under Analyze - Load a static mode with 2 x 1.0 mm. (Select small UHR Focus) - Perform 2 scans of that mode and use the second one

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89 -

Open an additional window. Start Options > Service > Local Service >TestTools > Analyze Select ICS-Rawdata, mark rotstatic.raw, and press Go. Select Raw data under File content and Press Go again. Select Tools Select Raw Data - Frequency Analysis and press Go Select the channels Start with 305 to 368. - Do not select the checkbox for fusing the slices. - Do not select Separate FFS - Select all slices

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DMS Zoom in the result, if necessary. The X-axis shows the frequency, and the Y-axis shows the amplitude.

Fig. 37: Example of raw data frequency analysis

¹ The amplitude at the first peak (here 120 Hz) shows the quality of anode rotation (wobbling anode). A peak does not necessarily mean that the tube has to be replaced. Check also for tube arcing and other errors related to the tube. ¹ The amplitude at the first harmonic shows the quality of the emitter (tube). NOTE

In addition to this test, the tube has to be checked before making the decision to replace it.

¹ Send the plot to CS HSC for additional evaluation.

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91

TSG DMS Components

3.2

TSG DMS Power path

0

NOTE

To order the correct power supply, always select the correct DMS type in the Spare Parts Catalog. The newer power supply types might look slightly different (LEDs and measurement points). The functionality is identical.

DMS types

Valid power supplies

DMS A part no. 10393100

Part no. 10023484 (Astec)

(uses 2 power supplies)

or Part no. 07274306 (Lambda)

DMS B part no. 10393150

Part no. 10023484 (Astec)

(uses 1 power supply)

or Part no. 07274306 (Lambda)

DMS A part no. 10393200

Part no. 07274306 (Lambda)

(uses 1 power supply) DMS B part no. 10393210

Part no. 07274306 (Lambda)

(uses 1 power supply) The power supplies for the DMS are located behind the metal DMS front covers. To check the power supplies, check the LEDs at the front of the corresponding DMS. Troubleshooting hint: If only the 24V LED at the power supply is on, the problem may be related to the DAS Controller or an overtemperature inside the DMS. In case of overtemperature, troubleshoot the cooling path. In case of 'temperature o.k.', proceed as follows:

• Reload Firmware • Check the error message • Check and reconnect the cable between DCON and the signal backplane (black-blue cable)

• Replace DCON • Replace the signal backplane Troubleshooting the power path Measure the voltages at the front side of the power supply/ies Power supply 10023484 (Astec):

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DMS Test point

Ground

Description

+24V / 4A

+24_RET

Right power supply: DCON + right signal backplane. Left power supply: left signal backplane

POS_V_D

DGND

3.3V / 20A module digital

POS_V_A

AGND

3V / 72A module analog

NEG_V_A

AGND

-2.8V / 72A module analog

Power supply 07274306 (Lambda): Test point

Ground

Description

+24V / 4A

Return

Power supply: DCON, right signal backplane, left signal backplane

POS_V_A

Return

3.25V / 60A module analog

NEG_V_A

Return

-2.8V / 60A module analog

POS_V_D

Return

3.3V / 30A module digital

TSG short-circuit in power supply To track down a short circuit in the power supplies, cables, backplanes, DAS Controller, or modules, perform the following: Before following this advice, be sure the mains input for the DMS power supply is ok. Tab. 43

TSG short-circuit in the DMS power path

Step 1

Action

• Check the Power LEDs on the DMS power supply. a) If the LED “+24V” is “off” -> continue with step 2. b) If the LED “POS_V_D”, “POS_V_A” or “NEG_V_A” is “off” -> continue with step 5.

2

• Disconnect X1 at left DMS backplane, switch the gantry off/on, and check the DMS power supply LED “+24V”. a) If the LED is “off” -> continue with step3 b) If “+24V LED” is “on” -> problem is related to left signal backplane half

3

• Disconnect X36 at right signal backplane half, switch the gantry off/on, and check the DMS power supply LED: “+24V”. a) If the LED is “off” -> continue with step 4 b) If the “+24V” LED is “on” -> problem is related to right backplane half.

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93 Step 4

Action

• Disconnect X500 at DCON, switch the gantry off/on, and check the DMS power supply LED “+24V”. a) If the LED is “off” -> check input voltage. b) If the “+24V” LED is “on” -> problem is related to DCON.

5

• Disconnect X2 on the rear side of the DMS power supply (unplug DMS power supply), switch the gantry off/on, and check the DMS power supply LEDs: “POS_V_D”, “POS_V_A” and “NEG_V_A”. a) If the LEDs are “off” -> check input voltage. b) If the LEDs: “POS_V_D”, “POS_V_A” and “NEG_V_A” are “on” -> problem is related to one of the modules on the respective backplane half. -> Disconnect the modules to isolate the fault. Note, it is necessary to switch the Gantry “off” and “on” again after a module is disconnected.

TSG UHR mechanics

0

If there are problems with the UHR mechanics, follow the advice provided in the error message. To understand the function of the UHR control (Implemented at UMAR), the current applied to the UHR motor is shown in the next figure. UHR phi-z comb: Current measurement is not possible. Follow the mechanical checks.

Fig. 38: Current of UHR motor

To identify problems of the UHR control, you may perform the following tests: Mechanics

• Check whether the mechanics are operating smoothly by moving the UHR in and out by hand. (remove the UHR motor to be able to move the UHR without applying too much force) ¹ If the mechanics are not moving smoothly: → Check for parts blocking the UHR.

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DMS Service switches

• Using the UHR service mode with the system in standby mode: -

Press “Stop” on the gantry or control box Switch on the service switch on the UMAR Press S1 (in) and S2 (out) on the UMAR to check UHR comb movement Press “Test” on the UMAR to perform a self-test Switch off the service switch on the UMAR

• Using the UHR service mode with the system not in standby mode: -

Switch the gantry to “Comp on” Switch on the service switch on the UMAR Switch the gantry to “Sys on” If the ICS aborts with the message “Can’t continue...”, press the “Test” button on the UMAR prior to using S1 (in) or S2 (out) - Switch off the service switch on the UMAR Limit switches

• If the problem is related to the limit switches: - Check their functionality using the service switch on the UMAR and move the UHR in and out by pressing S1 (UHR in) or S2 (UHR out). (Described above) Ensure that MOVE LED on the UMAR is activated at both mechanical end stops. ¹ If the LED is not activated at the end stop on one side: Position the UHR in the middle, so that no limit switch is activated. Use a piece of metal, e.g., a screwdriver, to check whether the limit switches are working properly. ¹ If the LED in the limit switch is not activating: → Check the power supply for the switch on the UHR control → Replace the corresponding limit switch - For checking the adjustment of limit switches, refer to the document Replacement of Parts: Gantry. UHR motor

• If the problem is related to the UHR motor: - Check their functionality using the service switch on the UMAR and move the UHR in and out by pressing S1 (UHR in) or S2 (UHR out). (Described above) Observe whether the UHR is moving. ¹ If the UHR comb is not moving: Measure the voltage for the UHR motor on UHR control D586 J1 (power) while they are activated via the service switches. → If the motor is not moving while voltage is present, replace the motor. → If there is no voltage, replace D586.

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95 Adjustment

• To ensure the UHR is adjusted correctly in the phi-direction, perform an MTF measurement. If the results are in tolerance, the adjustment is OK. If the results are out of tolerance, perform COMB ALI in the Tune-up platform. If the comb is fully maladjusted, the core position can be identified by evaluating a mean value plot of an UHR mode. Core position check of UHR comb If the UHR comb was largely maladjusted or the initial position was lost, you can try and find the core position by using analyze.

• Start Analyze Options > Service > Local Service > Test Tools > Analyze

• Select the radio button ICS-Tables • Mark an UHR mode BaseCal and press Go. • The plot of the BaseCal appears.

Fig. 39: Example of an UHR BaseCal plot

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DMS • Zoom both edges to see the channel where the UHR comb starts and ends.

Fig. 40: Zoom of lower channel side

Fig. 41: Zoom of higher channel side

¹ Compare your results with this example showing a well-adjusted UHR. The first channel with a higher value is channel 139 The last channel with a higher value is channel 534 Disabling the UHR comb

• If a defective UHR comb prevents the system from reaching standby, the comb can be disabled momentarily. How to disable the UHR comb: 1. Move the comb manually to the mechanical end out of the X-ray path 2. Remove connector J7

Fig. 42: UHR connection Pos. 1

Connector J7

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DMS

97 3. After the next INIT, save the machine configuration by selecting “none” for UHR (see example below)

Fig. 43: Factory-specific CT configuration

4. Save a copy of the original license.dat file

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98

DMS 5. Disable the UHR licenses by putting a “#” in front of the related licenses. (See example below)

Fig. 44: License.dat Pos. 1

License deactivation

NOTE

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Do not forget to restore the original configuration once the UHR comb is working again.

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99

Tests & Hints

3.3

DAS Type not o.k.

0

• Error message: “DAS Type not o.k.” - most likely the ID board is defective => Contact HSC

Firmware update failed

0

• Possible reasons: - black-blue cables between DCON and signal backplanes - DMS power supply/ies. - DAS Controller

• Test in the following order: - Check the black-blue cables between DCON and the signal backplanes for proper connections - Check LEDs at the power supply/ies. All 4 green LEDs have to be “on” after the Firmware update. During the Firmware update, the LEDs are switched “off” - Check if the red LED at DCON is “on”. If yes, restart the Firmware update. - Replace the DCON

Dynamic collimation

0

• Indications for a wrong dynamic collimation: - Spiral scans start or end with bright images, HU too high in this area. - White stripes in MPR

• Possible reasons: - wrong dynamic collimation, tube collimator moves too far which results in not enough dose.

• Test in the following order: - run the test for dynamic collimation (Dyn. Collimation / p. 180) - follow the TSG for Dyn. collimation

Signals from half detector missing

0

• Possible reason: - black-blue cables between DAS Controller and Signal backplane defective.

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DMS NOTE

These 2 cables have to be handled carefully! It is recommended to order such a cable as a spare. For troubleshooting purposes, the 2 cables can be swapped.

• Test in the following order: - Check cable for good contact - Gently swap the 2 black-blue cables and check, if error moves. - Replace the corresponding signal backplane

Storage of Test Results

0

• Test results are stored in two different ways: - As HTML files Path:c:\Somaris\service\html\report\htmlreport - As TXT files Path:C:\Somaris\service\extract - Additionally, it is sometimes helpful to use a screenshot to report the result plots: - Activate the window you intend to capture - Use Ctrl / PrtSc to capture the window - Start > Programs > Accessories > Paint - Use Edit > paste - File > save as and use file type gif to reduce the size Normally, HTML files are used to store test results. However, the plots of the DMS tests are usually stored in a text file (via Extract to File button). Please note: the file name has to be changed manually. Otherwise, the file will be overwritten each time the softkey is used. The file may be displayed using Excel (e.g. after manual remote transfer).

Environmental Conditions

0

Environmental conditions are a possible cause of weak ring artifacts. Check the Somaris log for errors and warnings . Gantry Inside the gantry, the temperature is regulated. To read out the actual values for temperature, use the control platform The output of the table may be selected in decimal or hexadecimal values. The gantry has to be in the standby mode when accessing the control system.

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101 ¹ To read out the actual temperature of the gantry, perform the following: 1. Options > Service > Local Service > Control > Table load/modify 2. Select Volatile under TABLE SOURCE. 3. In the list box TABLE NAMES select T00 4. Press Go The parameter set for the table T00 is shown. Use the slider to move to the desired information - gantry temperature [degrees C] The temperature air inlet has to be in the range of 19C +/- 1C DMS

• Environmental conditions for the DMS are: - Temperature : ¹ Check the Event log for errors and warnings concerning temperature problems. ¹ If raw data is available for the images the customer is complaining about, use Analyze to read out the temperature from the header data. This indicates the temperature at the time of data acquisition. Overview -Temperatures

• Temperatures: There are different limits for the internal DMS temperature (set by the UMAR). 40C - temp warning level; entry in the event log 50C - temp error level; entry in the event log; electronics are switched off.

Hints for defective channel detection

0

Additional information for defective channel detection

• After part replacement (e.g. module) or if you do not succeed in removing unsatisfactory channels, delete the IRS tables in the ICS as follows: 1. Go to C:\Somaris\service\datastore\icstable 2. Delete all files starting with badchannelsxxxxx 3. Start an automatic detection under service to create an actual channel status. A partial tune-up as described in the guided tours follows. Using Reports to view details of the Defective Channels Correction 1. Open an additional window and choose Reports . 2. From the menu bar TuneUp/QA/Tests choose: TuneUp > Table Generation > Def. Channels 3. Double-click Report to view the results. ¹ Detector Statistics shows all currently defective channels including scatter monitors. - Shows channels added by Automatic Detection and - Manually Added/Removed

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DMS

Distinguishing between the module and other components

0

If one ore more broken channels have been found using the Guided Tour or other tests, you have to find out if the problem is really caused by the module or by other components. 1. Cross the module cable on the DMS backplane with the neighboring one. 2. Close the DMS covers and repeat the test or mode that showed errors before. ¹ If the error moves to the neighboring slot, the module or module cable is broken. Continue with step 3. ¹ If the error does not move, the backplane (or DAS Controller) is defective. NOTE

A second peak may appear now in the displayed plot. This is normal with crossed/swapped module cables, if no new calibration,(e.g. a new Checkup or Setup/Calibration) has been performed prior to starting the second test run.

3. To distinguish between the module and module cable, swap the whole module cable (not crossed) with the cable of the neighboring module. Close the DMS covers and repeat the test or mode that showed errors before. ¹ If the error moves to the neighboring slot, the module cable is defective. ¹ If error does not move, the module is defective. 4. Swap module cable to its original position. 5. Run an assignment test to check the addressing of the DAS Controller. ¹ If the assignment test fails, replace the DAS Controller. ¹ Replace the corresponding backplane.

How to interpret the physicist’s line

0

To find the decoding for the physicist’s line, go to: - Somaris > Help > Contents and Index and - select the tab card Search and - type in the physicist’s line ¹ The explanation is shown

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Datalink General

4Datalink

103

40

Safety

0

WARNING

[ hz_serdoc_F13G01U12M03 ]

Avoid accidents and injury or damage to parts. Risk of accident or injury! ¹ Read and observe the safety information contained in the “General” section of this document and/or the “Product specific safety notes”. NOTE

Follow ESD guidelines when touching parts of the data transmission path.

Notes

0

3 rotating data rings are installed (one for Signal Link and two for datalink A+B). Keep this in mind when following the TSG. Basic function: The DMS data paths operate at 4.25 Gbps. The connection between the DMS and the IRS receiver is established through 2 simplex connections over rotating high speed data rings. There is a retransmission in condition of missing packets or bad readings. In the event log, the number of readings can be found in the information message CT_ITX_ 2 and in the warning message CT_ITX_7. DMS (DCON) to IRS For DMS A data, the inner structure of the 3 rotating data rings is used. For DMS B data the outermost structure is used. The middle structure is used for the signal link.

NOTE

For troubleshooting, the A data can be sent through the B path. > the fiber-optic cables at the Two Tx modules and at the IRS Receiver can be interchanged to use the other path. There is retransmission in case of missing packets or bad readings.

Definitions and abbreviations

0

LEDs on Central Units 1. Green Power: “off” if the power to the corresponding Tx or Rx module is missing. 2. Yellow Signal: “off” if no signal or a signal with low amplitude is detected.

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Datalink 3. Orange Sync: “off” or reduced intensity if sync error is detected. LEDs for datalink on Receiver(s) in IRS 1. Yellow Ready DL: “on” when a mode is load 2. Red Error DL: “on” if unsatisfactory readings are detected. When a segment on the data ring is defective, the LED is “on” synchronous to gantry rotation, depending on the angular position of the defect. 3. Green Data DL: “on” if DMS is idle and dummy data or measurement data is received 4. Red NoSync DL: “on” if sync error is detected. 5. Red NoSignal DL: “on” if no optical signal or signal with low amplitude is detected. 6. Red CRC Error DL: counts unsatisfactory readings received from DCON. Reset with next init.

NOTE

The Error, No Sync, No Signal and CRC LEDs are also switched on in case of sporadic errors for 100ms. Check these LEDs while rotating the data ring by hand.

Abbreviations Tx > Transmitter Electronics Rx > Receiver Electronics DCON > DAS Controller Rec > Receiver in IRS FODL1...3 > fiber optic datalink (connections for fiber-optic cables at DCON)

Prerequisites

0

For a quick check of the data path, a spare fiber-optic cable and a fiber-optic coupler are necessary. A short and long fiber-optic cable are supplied with every system. Use these fiber-optic cables to patch a certain segment of the data path in order to isolate the problem. The image below shows one of the supplied spare fiber-optic cables with its connectors separated for simplex use.

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105

Fig. 45: Spare fiber optic cable with coupler Pos. 1

spare fiber optic cable

Pos. 2

coupler

Pos. 3

fiber optic connectors, separated for simplex connections

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Datalink

Troubleshooting Data transmission General

4.1

0

NOTE

All modules are connected to Central Units, which monitor the function and state of the connected modules.

NOTE

At the Tx and Rx modules, simplex fiber-optic connections are used. The supplied spare fiber-optic cables are duplex connections. To use these cables for simplex connections, separate the cables at the connector.

Overview

0

NOTE

Start troubleshooting always by doing a check the LEDs at the Central Units and rotating the gantry by hand while doing a check the error LED at the rear side of the IRS.

On every TX and RX - module installed in the system there is a “green” LED, which shows that the TX-/RX - module is on. The LED will blink. The following image shows the location of the LED at rotating TX-/RX modules.

Fig. 46: RX and TX modules Pos. 1

LED at RX module ROT

Pos. 2

LED at TX modules ROT

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Datalink

107 NOTE

There are 2 Central Units CU (one stationary and one rotating) which include all necessary LEDs. Also no wiring interfaces are used because the Tx and Rx modules are supplied with power by the Central Units.

1. Central Unit STAT The following components are connected to the Central Unit STAT: -

RX module STAT Data Path A RX module STAT Data Path B RX module STAT Signal Link Tx Module STAT Signal Link

Fig. 47: Central Unit STAT Pos. 1

Central Unit STAT

Pos. 2

RX Module STAT Data Path A

Pos. 3

RX Module STAT Data Path B

Pos. 4

RX Module STAT Signal Link

Pos. 5

TX Module STAT Signal Link

2. RX Unit STAT2 for Data Path A + Signal Link

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108

Datalink NOTE

The Rx unit STAT2 consists of two Rx modules: the Rx module for datalink A and the Rx module for the signal link. These two modules cannot be interchanged for troubleshooting. For troubleshooting functions, interchange the fiber-optical cables at the Rx modules and check the LEDs at the central unit STAT. Always replace the full RX UNIT STAT2 in case of a broken Rx module. Look at the LEDs on the Central Unit if troubleshooting a transmission error in a CO system.

Fig. 48: RX Unit STAT2 Pos. 1

RX Unit STAT2

Pos. 2

RX Module STAT Signal Link

Pos. 3

RX Module STAT Data Path A

3. RX Unit STAT1

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109 NOTE

The RX Unit STAT1 consists of one RX module. The Rx module for Datalink B. This module cannot be interchanged for troubleshooting. Always replace the full Rx UNIT STAT1 in case of a broken Rx module. Look at the LEDs on the Central Unit if troubleshooting a transmission error in a CO system.

Fig. 49: RX Unit STAT1 Pos. 1

RX Unit STAT1 Data Path B

4. Tx module STAT The Tx module STAT is used for the Signal Link from STAT to ROT. NOTE

The Tx module STAT is connected to the CU STAT. Look at the LEDs on the CU for troubleshooting.

Fig. 50: TX Module STAT Pos. 1

TX Module Stat (fastlink)

5. Central Unit ROT The following components are connected to the Central Unit ROT:

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Datalink -

Tx Module ROT Data Path A Tx Module ROT Data Path B Tx Module ROT Signal Link RX module ROT Signal Link

Fig. 51: Central Unit ROT Pos. 1

Central Unit ROT

Pos. 2

TX Module ROT Data Path A

Pos. 3

TX Module ROT Data Path B

Pos. 4

TX Module ROT Signal Link

Pos. 5

RX Module ROT Signal Link

6. Rx module ROT The Rx module ROT is used for the Signal Link from STAT to ROT.

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111 NOTE

The Rx module ROT is connected to the CU ROT. The Rx module cannot be interchanged for troubleshooting. In case of a defective Rx module, replace the full unit (Rx module including carrier).

Fig. 52: Rx Module ROT Pos. 1

RX module ROT

7. Tx modules ROT The following image shows the Tx modules Rot. One Tx module for Data Path A, one for Data Path B and one Tx module for the Signal Link.

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Datalink NOTE

Look at the LEDs on the CU for troubleshooting.

Fig. 53: TX Modules ROT Pos. 1

TX Module ROT Data Path A

Pos. 2

TX Module ROT Signal Link

Pos. 3

TX Module ROT Data Path B

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113

TSG Datalink

4.2

Depending on the type of error, select the corresponding section.

NOTE

It may be helpful to check the event log in case of missing readings. In the event log, the number of readings can be found in the information message CT_ITX_ 2 and in the warning message CT_ITX_7.

TSG permanent errors on DAS Controller(s) > IRS Receiver Tab. 44

TSG permanent errors DCON to IRS

Step 1

0

Action

• Check the power for Tx module(s) ROT at CU ROT. a) if the green LED is “off”, > Tx is module defective or power from PDR is missing. Check power supply. Additionally, do the Data Link Test and check gantry error monitor for errors reported by UMAR: Power error b) If the LED is “on”, continue with step 2.

2

• Check signal for Tx module(s) ROT at CU ROT. a) If one or both of the yellow LEDs are “off”, > missing optical signal from DCON/s or broken/dirty fiber optic cable connections, or the Tx module is defective. Clean the fiber-optic cable and do a check again. If LED stays “off”, continue with step 3. Additionally, do the Data Link Test and check gantry error monitor for errors reported from UMAR: Signal error b) If the LED is “on”, continue with step 4. c) if the orange Sync LED at CU ROT is on, but with reduced brightness > check quality of signal. Refer to TSG data quality at Tx modules

3

• Check output of corresponding DCON by establishing a direct connection between DCON and Rec in IRS with the spare fiber optic cable. a) If Red NO Signal LED on Rec is “on” > DCON defective. b) if Red Link NO Signal LED on Rec turns “off” > DCON and Rec o.k. Establish the original connection and interchange the Two fiber-optic cables at the Tx input. If yellow LED for Tx module at CU ROT is “on” at this time, > cable between DCON and Tx module is defective. If yellow LED stays “off” > replace the Tx module.

4

• Check power for the corresponding stationary Rx module (A or B) at CU STAT. a) if the green LED at CU STAT is “off” > Rx module is defective or the power from UMAS is missing. Troubleshoot the power path first. b) if the LED is “on”, continue with step 5.

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Datalink Step 5

Action

• Check signal for the Rx module at CU STAT. a) if the yellow LED at CU STAT is “off”, > missing signal from transmitter, or rotating data ring is defective, or receiver carrier is maladjusted/defective, or Rx module is defective. Continue with step 6. b) If the yellow LED at CU STAT is on, continue with step 7. c) if the orange sync LED at CU STAT is on, but with reduced brightness > check quality of signal. Refer to TSG data quality at Rx modules.

6

• Check the data ring. a) adjust the triple receiver carrier (refer to replacement of parts section) and check the microstrip antenna. Refer to “How to check the transmitting antenna”. If resistance of microstrip antenna is o.k > replace the Tx module. If resistance of microstrip antenna is not ok > replace the rotating Data Ring. Call HSC before replacing the Data Ring.

7

• Check the connection Rx module to Rec. a) If red Link No Signal LED at Rec is “on” > missing signal from Rx module, or broken/dirty fiber optic connection, or Rec is defective. Clean the fiber-optic cable and do a check again. If the LED is stays “on”, continue with step 8. b) If the LED is “off” at this time, do the data link test.

8

• Use spare cable between Rx module and Rec. a) If red Link No Signal LED at Rec is stays “on” > Rx module or Rec in IRS is defective. Continue with step 9. b) If the No Signal LED is “off” at this time > replace the fiber-optic cable.

9

• Interchange the Two fiber-optic cables at the Rx modules or at the Rec in IRS. a) If the problem moves to the other slot > replace the Rx module. b) If the error is stays at the first slot> replace the Rec.

TSG data quality at Tx modules

0

The orange sync LEDs at the CUs must show a noticeable increase in light intensity in an idle system, or when plugging and unplugging the fiber-optic cable. Before starting troubleshooting for data quality, do the TSG for permanent errors first.

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115

Tab. 45

TSG data quality at Tx modules

Step 1

Action

• Unplug and plug the fiber-optic cables at the Tx modules rot. a) if sync LED at CU ROT shows reduced intensity (e.g. due to blinking at a high rate) > DCON output broken, or broken/dirty fiber optic connection from corresponding DCON, or Tx module broken. Clean the fiber-optic cable and do a check again. If the LED still shows reduced intensity, continue with step 2.

2

• Check the DCON output using a spare fiber-optic cable. a) Connect FODL1 to the corresponding Tx input with the spare cable. If the orange LED is o.k. at this time > replace the fiber-optic cable. b) If the orange LED still shows reduced light intensity (with spare cable installed), > DCON or the Tx module is defective. Continue with step 3.

3

• Check the DCON using the indicator on the CU ROT for the rotating fastlink transmitter. a) Connect FODL1 to the rotating Tx module for fastlink data using the spare fiber-optic cable. If the sync LED for the rotating fastlink transmitter at CU ROT also shows reduced intensity > replace DCON. b) If sync LED for the rotating fastlink transmitter shows a noticeable increase in light intensity> replace the Tx module.

4

• Additionally, do a Data Link test. a) Check the gantry error monitor in the Data Link test for errors reported by UMAR: Link error. >replace the Tx module.

TSG data quality at RX modules

0

First make sure that the quality of the data signal at the Tx modules is OK (see above). When plugging the fiber-optic cable into the Tx modules, there must be a noticeable increase in light intensity at the orange sync LED on both, the Tx and Rx modules, in an idle system.

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Datalink Tab. 46

TSG

Step

Action

• Unplug and plug in the fiber-optic cables at the Tx modules.

1

a) if the sync LED at CU STAT for Rx module permanently shows reduced intensity (e.g. due to blinking at a high rate) > Tx module (output) is defective, or the rotating Data Ring is defective, or receiver carrier is maladjusted/defective, or Rx module is defective. Continue with step 2.

• Adjust the receiver carrier (refer to the replacement of parts section) and

2

check the microstrip antenna. Refer to “How to check the transmitting antenna”. a) If the resistance of the microstrip antenna is o.k., replace the following parts in the order shown > 1. Tx module, 2. Receiver carrier, 3. rotating data ring. b) If the resistance of the microstrip antenna is not o.k. > replace the rotating Data Ring. Tell HSC before replacing the Data Ring.

• Additionally, do a Data Link test.

4

a) Check gantry error monitor in the Data Link test for errors reported by UMAS: Link error. b) Check for angle-dependent error distribution. If error is angle dependent > replace the rotating data ring. Tell HSC before replacing the Data Ring.

TSG sporadic errors in link DCON > IRS

0

The following table gives step by step how to troubleshoot sporadic transmission problems. Tab. 47

TSG

Step 1

Action

• Check indicators for sporadic errors: a) Check for IRS warnings in the eventlog b) Check error LED counter on Rec For detailed instructions, Refer to (Step 1 (checking) / p. 117)

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117 Step 2

Action

• Debug for random transmission errors: a) Check the data ring and the fiber optic cables using the spare fiber-optic cable. b) Interchange the data ring channels For detailed instructions, Refer to (Step 2 (debugging) / p. 117)

3

• Localize the source of error: a) Check for errors occurring in the DMS or IRS b) Check for errors occurring at about the same gantry angle c) Search for external interference as source of error d) Search for dominant source of errors For detailed instructions, Refer to (Step 3 (localizing) / p. 118)

Step 1 (checking)

0

• Check indicators for sporadic errors a) Check for IRS warnings in the eventlog: The IRS SW counts the data errors found in a scan and causes a warning message. Check the logbook for IRS errors, only the CRC errors are significant for data transmission. Other types of errors detected by IRS, e.g. HV_DROP, are not related to data transmission. b) Check the event log for the number of missing readings. Helpful messages can be found in the information message CT_ITX_ 2 and in the warning message CT_ITX_7.

Step 2 (debugging)

0

• Debug for random transmission errors a) check the data ring and the fiber-optic cables using the spare fiber-optic cable - Disable gantry rotation - Use the spare fiber-optic cable to connect the DCON outputs directly to the Rec input. - Do exactly the same (static) scan that is subject to sporadic errors with a normal configuration. If the sporadic error continues, the problem is within DCON or IRS. Otherwise, the debug procedure has to be refined. The fiber-optic cables between DCON → slip ring or between slip ring → IRS can be partially broken or have dirty ferrules in the connectors. Especially in the gantry, the connectors can be contaminated by carbon dust from the slip ring brushes. In this case, the signal at the fiber-optic cable output is lower than usual. However, the signal detect indicators may not trigger although the signal quality is poor. To isolate the problem, measure the fiber-optic cable loss factors as described in the appendix and replace the fiber-optic cable in case of higher losses. Alternatively, use the spare

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Datalink fiber-optic cable to successively patch the fiber-optic cable in question. If you get better results (reduced number of transitory errors or no error at all), clean the ferrules or replace the fiber. b) interchange the data ring channels The data path A uses same parts as data path B. For debugging, the A data can be sent through the B path. ¹ Interchange the fiber optic cables at the Tx modules and at the Rec to use the other path.

Step 3 (localizing)

0

• Localize the source of error The Data Link Test automatically does a statistical analysis regarding error distribution. Different histograms can be shown. a) Check for errors occurring in the DMS or IRS In case of a defective DCON or Rec, the data errors are apparently random and apparently due to transmission. However, in reality the error occurs before transmission in the DCON and after the transmission in the G-Rec. Select Bit Errors in the Data Link Test (Data link test / p. 123) to get a histogram plot of the Bit error position within the 16-bit data word. If the errors always occur at the same Bit position(s) within the 16-bit word, when repeating the data link test: ¹ DCON or G-Rec defective, transmission across the Data Rings o.k. Example for Bit Error histogram:

Fig. 54: Error bit position histogram

b) Check for errors occurring at about the same gantry angle: Problems with the mechanical align of slip ring antennas can make sporadic errors. Select both, Data Words Error and CRC Errors in the Data Link Test to show a histogram plot of error distribution around the rotation. The Data Words Error analysis may

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119 be slower but it does a check for every Bit error. The CRC Errors analysis does a check only for block errors and is faster. The example below shows errors concentrated at the same angular positions of the data ring. ¹ Turn the gantry by hand to this angular position and check the structure for defects and mechanical alignment. (0o is X-ray tube A at 3 o’clock). Example for relation between errors and rotation angle histogram:

Fig. 55: Histogram of error versus rotation angle

c) Search for external interference as source of error: Sporadic errors in the data path may be caused by the following external factors: -

© Siemens, 2009 For internal use only

Noise caused by the frequency converter for rotation Noise caused by the HV Generator Mechanical asymmetries in the antenna system External equipment (e.g. therapy equipment, ovens,...)

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120

Datalink Select both the Error Bursts and Error Free Intervals in the Data Link test to get two histograms that plot the error distribution within the data stream (distribution of the error burst length - EBL and error free interval - EFI). The following 3 cases show typical histograms for different error sources: Case 1 In this case both histograms have a Gauss (bell) shape. This suggests a periodic perturbation source such as the frequency inverter for gantry rotation or other power supply noise. ¹ Check the high-power connections at the generator, the grounding connection, and the high-power carbon brushes. ¹ Do tests with the rotation driver disabled or without radiation to better identify the perturbation source.

Fig. 56: Burst and EFI histogram case 1

Case 2 In this case only the burst histograms have a Gauss (bell) shape, whereas the EFI histogram decreases linearly. This suggests a non-periodic perturbation source such as external equipment operated near the CT examination room that is generating power line interference. ¹ Check the quality of the hospital AC power cables (line transient spike analyzer) and the grounding of the CT system as well as other hospital equipment operating nearby.

Fig. 57: Burst and EFI histogram case 2

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121 Case 3 In case burst histograms are concentrated and occur at very short burst lengths, whereas the EFI histogram decreases linearly, this is suggestive of a defective signal-to-noise ratio at some fiber optic input or at the RF input for the Rx module. ¹ Check the fiber-optic cables, clean the connectors, and align the receiver carrier.

Fig. 58: Burst and EFI histogram case 3

d) search for dominant sources of error: Each error source may contribute to the error budget, but only one is usually dominant. The Data Link Test is a useful tool for finding the dominant source for errors. The RF link across the data slip ring is subject to electromagnetic interference caused within the gantry. Primary sources for this interference are the ring motor and its frequency inverter as well as the high-voltage generator and power supplies on the rotating gantry. In order to identify the dominant source for errors, the debug strategy takes out one or more potential sources. Accordingly, the data link test gives predefined test modes that deal with this debug strategy. For example, to find the contribution of the X-ray generator to the error budget, do the data link test using scans without radiation. Investigate the initial error statistics: To get an idea about the initial error contour, do the data link test with patient-like modes, i.e. modes that simulate a real scan. Use either topogram-like modes ("Static 0 deg, X-Ray" "Static 90 deg, X-Ray") or sequence-like modes ("Rot 0.33s, X-Ray"... "Rot 1.000s, X-Ray"). ¹ Try and identify if the errors are related to particular parameters such as rotation speed, tube angle, etc...... Investigate the contribution of the rotation driver: To find the contribution of the rotation driver to the error budget, do the data link test with the predefined modes "Static X-Ray1" and "Static X-Ray2". These modes fully disable rotation, including active braking. The frequency inverter is disabled through SW and thus causes no interference at all. This is not equivalent to switching the rotation OFF! These tests may be done only in the static mode. The gantry must be set either through the local service platform or by hand to different angular tube positions or at

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Datalink positions where previous tests showed an increased error probability. If the error statistics change significantly as compared to previous tests, the dominant source for errors is the rotation driver and investigations must be carried out accordingly. Investigate the contribution of the X-ray generator: To find the contribution of the X-ray generator to the error budget, do the data link test with the predefined modes "Rot 0.33s" ... "Rot 1.000s". These modes disable X-ray generation for different rotation speeds. Use the rotation speeds that previously showed increased error probability. If the error statistics change significantly as compared to previous tests, the dominant source for errors is the X-ray generator and investigations must be carried out accordingly. Fine tuned investigation: After having used the above steps, it may become obvious that other test mode(s) may be more applicable to do a check-out a particular situation. In this case, edit the user-defined test modes "Static20.dat" and "Rot20.dat" with or without X-ray to fit the particular debug needs.

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123

Tests for data transmission

4.3

Cleaning a fiber optic cable

0

The cable's performance may deteriorate because of dust or dirt covering the input core in the cable’s receptacle.

Fig. 59: Cleaning optical connectors

Data link test

0

Scope

• The data link test is a sequence of scan done automatically with the DMS configured to cause test data (assignment mode). The data received are automatically analyzed in the IRS/ICS for every incorrect Bit. Error statistics are generated that allow for locating sources for error. If this test is successful, the transmission DMS to IRS works well.

• The data link test may be done at different rotation speeds or without rotation (ROT or STATIC modes) in the static mode with or without active braking of the gantry through the rotation driver, with radiation at different levels of X-ray power or without X-ray. How to find

•

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Options > Service > Local Service > Test Tools > Sys.Communication > datalink

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Datalink How to use

• Do the data link test after a careful analysis of IRS logbook errors. Search for those modes (rotation speed, X-ray power level, gantry tilt, etc.....) that are most prone to transmission errors and test the datalink with these particular modes. a) Press Select all, or select single modes, depending on the error pattern (e.g. rot. speed, X-ray, etc......) b) Press Go c) Wait for the Press START key to come into view and then push the Start button. ¹ If CRC errors or data errors are detected during the measurement, histogram evaluations can be selected. The evaluations are only available in case errors are detected (see next screenshot). For detailed data regarding the histogram evaluations, refer to TSG sporadic errors in link DCON > IRS

Fig. 60: Data link test, possible histogram evaluations

• The analysis SW will increment an error counter for each CRC error. The total number of transmission errors is available and shown as test result. The error counter operates over all readings into the scan that include at least five full rotations in order to find the relationship between tube angle and error occurrence. In the case of an error counter that is not zero, its time evolution can be plotted for all scans together with the tube angle position as depicted below:

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125

Fig. 61: Example of tube angle and error count versus frames

The X axis of the plot is the reading number. The vertical axis of Channel 2 (green plot) is the number of errors. The vertical axis of Channel 1 (yellow plot) is the angular tube position (0...360oC) as explained below. Gantry angle (deg)

0

30

60

90

120

150

180

210

240

270

Tube position (x o’clock) from the front

3

4

5

6

7

8

9

10

11

12

Tube position from the front

East (right)

South (bottom)

West (left)

North (up)

Selectively check or uncheck the channel 1,2 checkboxes to change the vertical scale. The gantry error monitor The power, signal, and link errors reported by the Tx and Rx electronic modules in the slip ring are monitored dynamically during the scan by the UMAR on the rotating gantry and by the UMAS on the stationary gantry. These errors are the same debug signals that are indicated by the green, yellow and orange LEDs available on both Rx and Tx modules. Both UMAR and UMAS HW count the number of times these errors were activated during the scan (error counter) as well as how long the errors were active during the scan (error time). This feature is useful for identifying transitory errors that occur due to loose contacts caused by mechanical vibrations during rotation that are otherwise not detectable.

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Datalink

Appendix

4.4

How check the transmitting antenna

0

The structures of the data rings can be measured with a digital multimeter. The figure below shows how to measure the innermost rotating data ring. The structures can be measured at the termination (see image below), and next to the transmitter shifted by 180 degrees (same test points at opposite side of data ring). The results may be slightly different ~1 Ohm 1. Use a digital multimeter to measure the resistance at the following test points:

Fig. 62: Measurement Points

Measure between

Nominal value

TP1 and TP3

92 Ohm +/- 1 Ohm

TP2 and TP4

92 Ohm +/- 1 Ohm

TP1 and Ground

51 Ohm +/- 0.5 Ohm

TP2 and Ground

51 Ohm +/- 0.5 Ohm

TP3 and Ground

51 Ohm +/- 0.5 Ohm

TP4 and Ground

51 Ohm +/- 0.5 Ohm

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127 NOTE

Measuring the resistance is important to find an interrupt or short-circuit in the structure. The nominal values must serve as a guideline. If the measured values are out of tolerance, tell HSC before replacing the data ring.

Measuring the fiber optic signal along the link

0

The fiber-optic cable power at both outputs of DCON and at the fiber optic output of the slip ring Rx module have to be high enough for reliable data transmission. The fiber-optic receivers in the UMAR, slip ring Tx, and G-REC have built-in signal level detectors that report an error when the signal falls below a safe minimum level. However, for error identification it is important to know if the problem is the incoming signal or the receiving part itself. It may be possible that the power supplied via fiber optic cable to the input is high enough, however, the fiber optic receptacle in the receiver module is covered with dust or dirt, and the incoming light does not reach the destination. The fiber optic signal can be measured at any point in the link using an optical power meter (e.g. the HP 8410A or HP 8153A). The power level of the fiber optic cable must be a minimum of -9 dBm avg. at 850 nm into a 62.5/125 MMF fiber optic cable. The modulation signal (fiber optic cable extension ratio) can be optimally measured with an oscilloscope and a fiber optic probe, e.g. Tektronix 6701B. The signal amplitude is typically 400µW. Note: A fiber optic cable installed in the gantry is difficult to measure with the above instruments unless the cable is fully released from the gantry cable harness. To prevent this operation, you may use the spare fiber optic cable and the adapter to extend a cable end up to the measuring instrument. Consider more loss in the spare cable to correct the last result.

Check the electrical RF signals at the Rx modules

0

The Rx modules receive RF signals through the capacitive coupling between the transmitting rotating slip antenna and the stationary receiving segment antenna. The RF coupling condition depends on the mechanical tolerances. The tests below have to be done by manually rotating the gantry 360 degrees. Turn the gantry by hand, check the status of the LEDs at the CUs for Tx and Rx modules. Continue as described below. Causes why signal detect LED for Rx module at CU is off:

• Tx module defective (output) • Slip ring antenna system is defective or align is necessary

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Datalink • Rx module (input) is defective Check the Tx module output: Interchange the fiber optic inputs of the 2 stationary Rx modules and check if the status of the signal LEDs for the Rx modules changes at the CU ROT. Additionally, replace the corresponding Tx module with a new one. Check the slip ring antenna system: Refer to “How to check the transmitting antenna”. For alignment instructions, refer to the replacement of parts section, replacing the receiver carriers

Check the quality of data signal (jitter) at the REC input

0

Note: If the IRS is energized and the FPGA devices on the Rec are configured, the yellow DL Ready LED is blinking. If not, troubleshoot the IRS. 1. Do the Data Link test with the Service Platform and check the CRC error sum and data error sum counters. 2. Alternatively load a scan to start the Error indicators at G-REC. The green DL Data LED must be “on”. Errors are detected by the Recs, if the DL Error LED is on or blinking, and if the 8-Bit error counter increments. 3. In case of transmission errors, refer to “TSG permanent errors DAS controllers > IRS Receiver”.

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5Fastlink

129

50

Safety

0

WARNING

[ hz_serdoc_F13G01U12M03 ]

Avoid accident and injury or damage to parts. Risk of accident and injury! ¹ Read and observe the safety information contained in the “General” section of this document and/or the “Product specific safety notes”. NOTE

Follow the ESD guidelines when touching data transmission parts.

Notes

0

This chapter contains data on how to troubleshoot the fastlink connections and the fastlink paths.

NOTE

All fastlink ports at the UMAR/UMAS and at the corresponding connected components are compatible. By using a patch cable, every port can be connected to any other port to do a check of transmit and receive functions. Every fastlink port has minimum 2 LEDs that show the receive status. It is always important to do a check of the LEDs at both components to find out if the problem is related to a transmit problem of the first component, or a receive problem of the other component.

The following Troubleshooting Guides (TSGs) are included in this chapter: 1. Direct fastlink connections in rotating part of gantry All rotating components connected to the fastlink are connected through the UMAR 2. Direct fastlink connections in the stationary part of the gantry All stationary components connected to the fastlink are connected through the UMAS 3. Transmission path UMAS to UMAR Data transmission between UMAS and UMAR is done through the stationary transmitter, the stationary data ring, and the rotating receiver assembly. 4. Transmission path UMAR to UMAS Data transmission between UMAR and UMAS is done through the rotating transmitter, the rotating data ring, and the stationary receiver assembly.

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Fastlink

Definitions and abbreviations

0

Tx module> Transmitter electronics module Rx module > Receiver electronics module CU STAT> Central unit stationary CU ROT> Central Unit rotating

Prerequisites

0

For a quick check of the signal link, a spare fiber optic cable and a fiber optic coupler are necessary. A short and long fiber optic cable are supplied with every system. Use these fiber optic cables to patch a certain segment of the data path in order to isolate the problem.

NOTE

At the Tx and Rx modules, simplex fiber optic connections are used. Components to and from UMAR/UMAS use duplex connections. The supplied spare fiber optic cables are duplex connections. To use these cables for simplex connections, separate the cables at the connector.

The image below shows one of the supplied spare fiber optic cables with its connectors separated for simplex use.

Fig. 63: Spare fiber optic cable with coupler Pos. 1

spare fiber optic cable

Pos. 2

coupler

Pos. 3

fiber optic connectors, separated for simplex connections

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131

TSG Fastlink

5.1

Depending on the error message, select the corresponding TSG.

NOTE

Start troubleshooting always by doing a check the LEDs at the Central Units and at the connected components while rotating the gantry by hand.

Information: On every TX and RX module installed in the system there is a “green” LED, which shows that the TX-/RX module is on. The LED will blink. The following image shows the location of the LED at rotating TX-/RX modules.

Fig. 64: RX and TX modules Pos. 1

LED at RX module ROT

Pos. 2

LED at TX modules ROT

Doing a quick check of the Fastlink: The fastlink test within the Service Platform is a quick check for the fastlink path. Select: Local Service>Sys.Communication>Fastlink This test has to pass without any errors determined by the counters. If errors are found with this test, refer to TSG for the fastlink connections in this section. Using the ping command: The connection from the host to the UMAS (Ethernet) has the IP address: 192.168.184.4 The connection from the host to the UMAR (Ethernet+Fastlink) has the IP address: 192.168.184.132

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Fastlink NOTE

There are 2 Central Units CU (one stationary and one rotating) which include all necessary LEDs. The Tx and Rx modules are supplied with power by the Central Units. The following images will help you identify the components of the signal link.

TSG rotating fastlink connections

0

The following explains the rotating fastlink connections and the LEDs which are useful error indicators. 1. Central Unit ROT The following components are connected to the Central Unit ROT: -

Tx Module ROT Data Path A Tx Module ROT Data Path B Tx Module ROT Signal Link RX module ROT Signal Link

Fig. 65: Central Unit ROT Pos. 1

Central Unit ROT

Pos. 2

TX Module ROT Data Path A

Pos. 3

TX Module ROT Data Path B

Pos. 4

TX Module ROT Signal Link

Pos. 5

RX Module ROT Signal Link

2. Rx module ROT The Rx module ROT is used for the Signal Link from STAT to ROT.

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133 NOTE

The Rx module ROT is connected to the CU ROT. The Rx module cannot be interchanged for troubleshooting. In condition of a defective Rx module, replace the full unit (Rx module including carrier). Look at the LEDs on the CU if troubleshooting the RX module.

Fig. 66: Rx Module ROT Pos. 1

© Siemens, 2009 For internal use only

RX module ROT

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Fastlink 3. Tx modules ROT The following image shows the Tx modules rot, one Tx module for Data Path A and one for data path B and one Tx module for the Signal Link.

Fig. 67: TX Modules ROT Pos. 1

TX Module ROT Data Path A

Pos. 2

TX Module ROT Signal Link

Pos. 3

TX Module ROT Data Path B

LEDs on UMAR 1. NoSD: “On” if no optical signal or signal with low amplitude is detected 2. Error: “On” , if Sync or CRC error detected LEDs on XDC 1. NO SIG: “On” if no optical signal or signal with low amplitude is detected 2. Error: “On” if Sync or CRC error detected LEDs on tube collimator 1. FL Sig: “On” if no optical signal or signal with low amplitude is detected 2. FL Err: “On” if Sync or CRC error detected LEDs on left backplane DMS 1. COM_BUS: “Green” if a correct fastlink protocol is received. “Red” if fastlink protocol is not correct.

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Tab. 48

TSG rotating fastlink connections

Step

Action

1

• Check the red NoSD and Error LED at the UMAR and at the connected component (e.g. tube collimator, XDC). a) If one or both LEDs (Error and NoSD) are “on” or blinking at UMAR or/and at the connected component > clean the fiber optic cable. Refer to “Cleaning a fiber optic cable”. If LEDs stay “on”, continue with step 2.

2

• Switch “off” and “on” the gantry at the control box. a) If LEDs are still “on” or blinking, continue with step 3.

3

• Check the UMAR by interchanging the connectors. a) Interchange the fastlink connector at the UMAR with the neighboring one. If the error moves to the neighboring slot, > UMAR o.k., the fiber optic cable or the connected component is defective. Interchange the connectors to their original positions and continue with step 4. b) If the error does not move to the other slot, > UMAR defective.

4

• Check the connection using a spare fiber optic cable. a) Connect the corresponding slot of the UMAR to the connected component with the spare fiber optic cable. If LEDs stay “on” > replace the connected component. Before replacing the component, connect the component to any other fastlink port with the spare fiber optic cable, and check the LEDs to validate the defect. b) if LEDs are “off” at this time > cable between UMAR and component defective.

TSG stationary fastlink connections

0

The following figure shows the stationary fastlink connections and the LEDs which are useful error indicators. 1. Central Unit STAT The following components are connected to the Central Unit STAT:

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Fastlink -

RX module STAT Data Path A RX module STAT Data Path B RX module STAT Signal Link Tx Module STAT Signal Link

Fig. 68: Central Unit STAT Pos. 1

Central Unit STAT

Pos. 2

RX Module STAT Data Path A

Pos. 3

RX Module STAT Data Path B

Pos. 4

RX Module STAT Signal Link

Pos. 5

TX Module STAT Signal Link

2. RX Unit STAT2 for Data Path A + Signal Link

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137 NOTE

The Rx unit STAT2 consists of two Rx modules: the Rx module for datalink A and the Rx module for the signal link. These two modules cannot be interchanged for troubleshooting. For troubleshooting functions, interchange the fiber optic cables at the Rx modules and do a check of the LEDs at the central unit STAT. Always replace the full RX UNIT STAT2 in case of a broken Rx module.

Fig. 69: RX Unit STAT2 Pos. 1

RX Unit STAT2

Pos. 2

RX Module STAT Signal Link

Pos. 3

RX Module STAT Data Path A

3. Rx Unit STAT1 (datalink B) The RX Unit STAT1 consists of the RX module STAT for Data Path B. NOTE

The RX Unit STAT1 consists of one RX module. The Rx module for Datalink B. This module cannot be interchanged for troubleshooting. Always replace the full Rx UNIT STAT1 in case of a broken Rx module.

Fig. 70: RX Unit STAT1 Pos. 1

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RX Unit STAT1 Data Path B

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Fastlink 4. Tx module STAT The Tx module STAT is used for the Signal Link from STAT to ROT. NOTE

The Tx module STAT is connected to the CU STAT.

Fig. 71: TX Module STAT Pos. 1

TX Module Stat (fastlink)

LEDs on UMAS 1. NoSD: “On” if no optical signal or signal with low amplitude is detected 2. Error: “On” , if Sync or CRC error detected LEDs on XGS in PDC (D703) 1. Light Err: “On” if no optical signal or signal with low amplitude is detected 2. Link Err: “On” , if Sync or CRC error detected LEDs on PHS (LMAS) 1. Transceiver Signal detect: “On” if no optical signal or signal with low amplitude is detected 2. Receive Error: “On” , if Sync or CRC error detected LEDs for fastlink on Receiver(s) in IRS 1. Yellow Ready: is not in use 2. Red Error: is not in use 3. Green Data: is not in use 4. Red No Sync: “on” , if sync error is detected. 5. Red No Signal: “On” if no optical signal or signal with low amplitude is detected 6. Red CRC Error: “on” unless correct CRC is detected.

NOTE

SOMATOM Definition Flash

The Error, No Sync, No Signal and CRC LEDs are also switched on in case of sporadic errors for 100ms. Check these LEDs while rotating the data ring by hand.

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Tab. 49

TSG stationary fastlink connections

Step

Action

1

• Check the red NoSD and Error LED at the UMAS and at the connected component. a) If one or both LEDs (Error and NoSD) are “on” or blinking at UMAS or/and at the connected component > clean the fiber optic cable. Refer to “Cleaning a fiber optic cable”. If LEDs stays “on”, continue with step 2.

2

• Switch “off” and “on” the gantry at the control box. a) If LEDs stay “on” or blinking, continue with step 3.

3

• Check the UMAS by interchanging connectors. a) interchange the fastlink connector at the UMAS with the neighboring one. If the error moves to the other slot, > UMAS o.k., the fiber optic cable or the connected component is defective. Interchange the connectors to their original positions and continue with step 4. b) If the error does not move to the other slot, > UMAS defective

4

• Check the connection using a spare fiber optic cable. a) Connect the corresponding slot of the UMAS to the connected component with the spare fiber optic cable. if LEDs stay “on” > Replace the connected component. Before replacing the component, connect it to any other fastlink port with the spare fiber optic cable, and check the LEDs to validate the defect. b) if LEDs are “off” at this time > cable between UMAS and component defective

TSG for connection UMAS > UMAR NOTE

0

To find angle-dependent problems, turn the gantry by hand and check the error LED at UMAR. If the LED is “on” for specified angular positions, check the data ring first.

The following explains the LEDs which are useful error indicators. LEDs on CU STAT for stationary Tx module: 1. Power: “Off” if power to the Tx module is missing. 2. Signal: “Off” if no signal or signal with low amplitude is detected 3. Sync: “Off or decreased intensity (blinking)” if Sync or CRC error is detected LEDs on CU ROT for rotating Rx module: 1. Power: “Off” if power to the Tx module is missing. 2. Signal: “Off” if no signal or signal with low amplitude is detected 3. Sync: “Off or decreased intensity” if Sync or CRC error is detected.

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140

Fastlink LEDs on UMAR 1. NoSD: “On” if no signal or signal with low amplitude is detected 2. Error: “On” , if Sync or CRC error detected Tab. 50

TSG fastlink path UMAS to UMAR

Step 1

Action

• Check all fastlink indicators (LEDs) in the path UMAS>UMAR. a) if one or more LEDs in the path are not in the idle state, continue with step 3. b) if all LEDs are idle, continue with step 2.

2

• Check output of UMAS by establishing a direct connection between UMAS and UMAR with a spare fiber optic cable. a) If Red NoSD and Error LED at UMAR are “on” > UMAS defective. Before replacing the UMAS, connect UMAS to any other fastlink port with the spare fiber optic cable, and check the LEDs to validate the defect. b) if Red NoSD and Error LED at UMAR are “off” > UMAS and UMAR o.k. Establish the original connection and continue with step 3.

3

• Check power for stationary Tx module at CU STAT. a) If the green LED at CU STAT is “off”, > Tx module is defective or power from UMAS is missing. Check the power path. b) if the LED is “on”, continue with step 4.

4

• Check the signal for the stationary Tx module at CU STAT. a) If the yellow LED is “off” at CU STAT, > missing signal from UMAS or broken/dirty fiber optic cable connection, or Tx module is defective. Clean the fiber optic cable. Refer to “Cleaning a fiber optic cable”. If yellow LED stays “off”, > connect the UMAS and Tx module with the spare fiber optic cable. If the problem is not related to the cable, establish the original connection. b) If the orange sync LED at CU STAT is “on” , but with decreased brightness > check the quality of the signal. Refer to “TSG data quality at Tx modules”. c) If all LEDs are “on”, continue with step 5.

5

• Check the power for the Rx module at CU ROT. a) If the green LED at CU ROT is “off”, > Rx module is defective or power from UMAR is missing. Troubleshoot the power path first. b) if the LED is “on”, continue with step 6.

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Fastlink

141 Step 6

Action

• Check signal for the Rx module at CU ROT. a) if the yellow LED at CU ROT is “off”,> missing signal from transmitter, or stationary data ring defective, or rotating receiver carrier is defective. Continue with step 7. b) if the orange sync LED at the CU ROT is “on”, but with decreased brightness > check the quality of the signal. Refer to "TSG data quality at Rx modules" c) If all LEDs are “on”, continue with step 8.

7

• Check the stationary data ring a) Measure the resistance of the stationary data ring. Refer to “How to check the transmitting antenna”.. If resistance not o.k., replace the data ring. Tell HSC before replacing the data ring. b) Adjust the rotating receiver carrier. If the error stays, continue with step 8.

8

• Check the connection from Rx to UMAR. a) If the red LEDs at the UMAR are “on” > missing signal from Rx module, or broken/dirty fiber optic connection, or UMAR is defective. Clean the fiber optic cable. Refer to “Cleaning a fiber optic cable”. If the LEDs stay “on”, establish the original connection and continue with step 9.

9

• Use the spare fiber optic cable between Rx module and UMAR. a) If red LEDs at UMAR stay “on” > Rx module or UMAR defective. Continue with step 10. b) If the error LED is “off” at this time > Replace the fiber optic cable.

TSG for connection UMAR > UMAS NOTE

0

The UMAR>UMAS path uses the middle structure of the rotating data ring. To isolate the data ring, the outer or inner structure (DMS A/B path) can be used temporarily. Use the Tx module and Rx module of the DMS data path, and temporarily establish fastlink connections to do a check of the data ring (use the spare fiber optic cables).

LEDs on CU ROT for rotating Tx module: 1. Power: “Off” if power to the Tx module is missing. 2. Signal: “Off” if no signal or signal with low amplitude is detected 3. Sync: “Off or decrease intensity (blinking)” if Sync or CRC error is detected LEDs on CU STAT for stationary Rx module: 1. Power: “Off” if power to the Tx module is missing. 2. Signal: “Off” if no signal or signal with low amplitude is detected

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Fastlink 3. Sync: “Off” or decreased intensity” if Sync or CRC error is detected. LEDs on UMAS 1. NoSD: “On” if no signal or signal with low amplitude is detected 2. Error: “On” , if Sync or CRC error is detected Tab. 51

TSG fastlink path from UMAR to UMAS

Step 1

Action

• Check all fastlink indicators (LEDs) in the path UMAR>UMAS a) if one or more LEDs in the path are not in the idle state, continue with step 3. b) If all LEDs are idle, continue with step 2.

2

• Check the output of UMAR by establishing a direct connection between UMAR and UMAS with a spare fiber optic cable. a) If Red NoSD and error LED at UMAS are “on” > UMAR defective. Before replacing the UMAS, connect UMAS to any other fastlink port with the spare fiber optic cable, and check the LEDs to validate the defect. b) If Red NoSD and Error LED at UMAR are “off” > UMAS and UMAR o.k. Establish the original connection and continue with step 3.

3

• Check the power at the CU ROT for the rotating Tx module. a) If the green LED at CU ROT is “off”, > Tx module is defective or power from UMAR is missing. Check the power path. b) If the LED is “on”, continue with step 4.

4

• Check signal for the Tx module at CU ROT. a) If the yellow LED is “off” at CU ROT, > missing signal from UMAR, or broken/dirty fiber optic cable connection, or Tx module is defective. Clean the fiber optic cable. Refer to “Cleaning a fiber optic cable”. If yellow LED stays “off”, connect the UMAR and the Tx module with the spare fiber optic cable. If the problem is not related to the cable, establish the original connection and continue with step 5. b) if the orange Sync LED at CU ROT is “on”, but with decreased brightness > check quality of signal. Refer to “TSG data quality at Tx modules”. c) If all LEDs are “on”, continue with step 5.

5

• Check the power for the Rx module at the CU STAT. a) if the green LED at CU STAT is “off” > Rx module is defective or the power from UMAS is missing. Troubleshoot the power path. b) if the LED is “on”, continue with step 6.

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Fastlink

143 Step 6

Action

• Check signal for the Rx module at CU STAT. a) if the yellow LED at CU STAT is “off” > missing signal from transmitter, or rotating data ring is defective, or stationary receiver carrier is defective. Continue with step 7. b) if the orange Sync LED at CU STAT is “on”, but with decreased brightness > check quality of signal. Refer to "TSG data quality at Rx modules" c) If all LEDs are “on”, continue with step 8.

7

• Check the rotating data ring (fastlink path). Refer to “How to check the transmitting antenna" and readjust the stationary receiver carrier. a) Measure the resistance of the rotating data ring (fastlink uses the outermost structure). If resistance not o.k. > replace the data ring. Tell HSC before replacing the data ring. b) Adjust the stationary receiver carrier. If the error stays, continue with step 8.

8

• Check the connection from stationary Rx module to UMAS. a) If the red error LEDs at UMAS are “on” > missing signal from Rx module, or broken/dirty fiber optic connection, or UMAS is defective. Clean the fiber optic cable. Refer to “Cleaning a fiber optic cable”. If the LEDs at UMAS stay “on”, establish the original connection and continue with step 9.

9

• Use a spare fiber optic cable between stationary Rx module and UMAS. a) If the red LEDs at UMAS stay “on” > Rx module or UMAS is defective. Continue with step 10. b) If the LEDs are “off” at this time > Replace the fiber optic cable.

TSG data quality at Tx modules

0

Two Tx modules are used for fastlink data transmission: one stationary Tx module for the uplink to the rotating part, and one rotating Tx module for the downlink from the rotating to the stationary part. Before starting troubleshooting for data quality, do the TSG for the fastlink connections first.

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Fastlink Tab. 52

TSG data quality at Tx modules

Step 1

Action

• Unplug and plug in the fiber optic cables at the Tx module. a) if the sync LED at corresponding CU shows decreased intensity (e.g. due to blinking at a high rate) > UMAR/UMAS output broken, or broken/dirty fiber optic connection from UMAR/UMAS, or Tx module is broken. Clean the fiber optic cable. Refer to “Cleaning a fiber optic cable”. If the LED still shows decreased intensity, continue with step 2.

2

• Check the UMAR/UMAS output using a spare fiber optic cable. a) Connect UMAR/UMAS to the corresponding Tx with the spare fiber optic cable. If the orange LED is o.k. at this time > replace the fiber optic cable between UMAR/UMAS and the Tx module. b) if the orange LED at corresponding CU still shows decreased light intensity (with spare cable installed), > UMAR/UMAS or Tx module defective. Continue with step 3.

3

• Check the UMAR/UMAS output using the indicator on any other Tx module. a) Connect UMAR/UMAS to any other TX module within the system, using the spare fiber optic cable. If the sync LED at the temporarily used Tx module also shows decreased intensity > replace UMAR/UMAS. b) If the sync LED at the CU of the temporarily used Tx module shows a noticeable increase in light intensity> replace the corresponding Tx module.

TSG data quality at Rx modules

0

First make sure that the quality of the data signal at the Tx module is OK (see above). When plugging the fiber optic cable into the Tx module, there must be a noticeable increase in light intensity at the orange Sync LED on both the Tx and Rx modules. This condition can change at different gantry angular positions.

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Fastlink

145

Tab. 53

TSG

Step 1

Action

• Unplug and plug in the fiber optic cables at the corresponding Tx module. a) if the sync LED for the Rx module shows decreased intensity (e.g. due to blinking at a high rate) at the corresponding CU > Tx module (output) broken, or a broken data ring, or a broken Rx module, or the receiver carrier is defective. Continue with step 2.

2

• Check the RX modules. a) Interchange the corresponding Rx module with any other Rx module (e.g. spare module) and do a check of the sync LED at the CU. If the error moved to the temporarily used Rx module, > replace the Rx module. b) if the orange LED at the corresponding CU still shows decreased light intensity, put the modules back as they orignally were and continue with step 3.

3

• Check the data ring. Refer to “How to check the transmitting antenna”, and readjust the receiver carrier (refer to the replacement of parts section). a) If resistance of the microstrip antenna is o.k., replace the parts in the following order, after adjusting the receiver carrier > 1. Tx module, 2. receiver carrier, 3. rotating data ring. b) If the resistance of the microstrip antenna is not o.k. > replace the rotating Data Ring. Tell HSC before replacing the data ring.

Tests for data transmission

0

Cleaning a fiber optic cable The cable's performance can degrade because of dust or dirt covering the input core in the cable’s receptacle.

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Fastlink

Fig. 72: Cleaning optical connectors

How to check the transmitting antenna The structures of the data rings can be measured with a digital multimeter. The figure below shows how to measure the innermost rotating data ring. The structures can be measured at the termination (see image below), and next to the transmitter shifted by 180 degrees (same test points at opposite side of data ring). The results can be slightly different ~1 Ohm

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Fastlink

147

1. Use a digital multimeter to measure the resistance at the following test points:

Fig. 73: Measurement Points

Measure between

Nominal value

TP1 and TP3

92 Ohm +/- 1 Ohm

TP2 and TP4

92 Ohm +/- 1 Ohm

TP1 and Ground

51 Ohm +/- 0.5 Ohm

TP2 and Ground

51 Ohm +/- 0.5 Ohm

TP3 and Ground

51 Ohm +/- 0.5 Ohm

TP4 and Ground

51 Ohm +/- 0.5 Ohm

NOTE

Measuring the resistance is important to find an interrupt or short-circuit in the structure. The nominal values shall serve as a guideline. If the measured values are out of tolerance, tell HSC before replacing the data ring.

Measuring the fiber optic signal along the link The fiber optic cable power at the fiber optic output of the slip ring Rx module has to be high enough for reliable data transmission. The fiber optic receivers in the UMAR, slip ring Tx/Rx modules, and UMAS have built-in signal level detectors that report an error when the signal falls below a safe minimum level. However, for error identification it is important to know if

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148

Fastlink the problem is the incoming signal or the receiving part itself. It may be possible that the power supplied through fiber optic cable to the input is high enough, however, the fiber optic receptacle in the receiver module is covered with dust or dirt, and the incoming light does not reach the destination. The fiber optic signal can be measured at any point in the link using an optical power meter (e.g. the HP 8410A or HP 8153A). The power level of the fiber optic cable must be a minimum of -9 dBm avg. at 850 nm into a 62.5/125 MMF fiber optic cable. The modulation signal (fiber optic cable extension ratio) can be optimally measured with an oscilloscope and a fiber optic probe, e.g. Tektronix 6701B. The signal amplitude is typically 400µW. Note: A fiber optic cable installed in the gantry is difficult to measure with the above mentioned instruments unless the cable is fully released from the gantry cable harness. To prevent this operation, you can use the supplied spare fiber optic cable and the adapter to extend a cable end up to the measuring instrument. Consider more loss in the spare cable to correct the last result.

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CAN Bus

149

6-

CAN Bus

6CAN Bus

0

NOTE

The CAN tests (Test Tools / Sys. Communication) are not reliable for troubleshooting the CAN bus.

CAN bus rotating part The UMAS is the master controller for the CAN bus of the rotating part. The CAN bus consists of a closed loop which is routed through certain rotating components. The terminal resistor of the CAN bus has a value of 120 ohm and is located inside of the UMAR. The 2 wires of the loop are named CAN_L and CAN_H. The CAN bus wires CAN_L and CAN_H are routed from the UMAS via the rear slip ring (2 tracks) to the UMAR. At the UMAR, the CAN bus wires are routed through XGR A/B, XDC A/B and the PDR. Because the CAN bus is a hard-wired loop connection (refer to figure), the resistance of the loop can be measured using a multimeter. The resistance at plug X401 on cable W399 between pin 2 and 10 must be 120 +30/-10 ohm. Also check that the 2 CAN wires (CAN_l/CAN_H) are insulated from ground. All affected CAN bus components are indicated in the figure below.

Data transfer UMAS to UMAR via CAN slip ring

0

Fig. 74: CAN Bus Pos. 1

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Image only for reference, not updated when functional description is changed. For details please see functional description.

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CAN Bus

Data transfer UMAS to UMAR via Fast Link (function pack 1: CAN over IP)

0

Fig. 75: Data transfer UMAS to UMAR via Fast Link

NOTE

As of September 2010, systems will be delivered with VA27 software function pack 1: CAN over IP. Activation of the CAN over IP via Fast Link requires the dummy plugs (120 ohms) on UMAS (X401) and on UMAR (X305). Description of function pack 1: During the INIT phase of UMAS and UMAR, the system checks the data transfer via the CAN slip ring. If data transfer via the CAN slip ring is not possible, the system is switched to the CAN over IP mode (Fast Link connection).

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CAN Bus

151

Fig. 76: UMAS

Fig. 77: UMAR

Pos. 1

Pos. 1

X401: Dummy plug (120 ohms)

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152

CAN Bus

TSG CAN bus (rotating part) Tab. 54

0

CAN bus troubleshooting

Step

Action

1

• Switch system off and press service switch S1 in PDC-A to switch off gantry power completely.

2

• Data transfer UMAS to UMAR via Fast Link (CAN over IP): Disconnect the dummy plugs (120 ohms) from UMAS (X401) and UMAR (X305). Measure the internal resistance of the dummy plugs between pin 2 and pin 10. The measured resistance value must be 120 +30/-10 ohms. Measure the resistance at the dummy plugs (120 ohms) from pin 2 and pin 10 against system ground. The resistance value must be > 10 kohms.

• Data transfer UMAS to UMAR via CAN slip ring: Remove plug X401 from UMAS. Measure the resistance at plug X401 on cable W 399 between pin 2 and pin 10. a) If the measured resistance value is 120 +30/-10 ohm -> wiring from plug X401 cable W399 to the 120 ohm bus terminator inside of the UMAR is ok -> continue with item 3. b) If the resistance value is not 120 +30/-10 ohm -> continue with item 4. 3

(Skip this step if data transfer UMAS to UMAR is performed via Fast Link.)

• Measure the resistance at plug X401 on cable W 399 from pin 2 and pin 10 against system ground. a) If the resistance value is > 10 Kohm -> insulation on CAN_H and CAN_L wires against system ground is ok -> no further action necessary. b) If the resistance value is about 0 ohm -> insulation for CAN_H and CAN_L against system ground is not ok (short circuit to ground) -> continue with item 5.

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CAN Bus

153

Step

Action

4

• Remove plug X305 from UMAR. Measure the resistance at plug X305 on the UMAR between pin 2 and pin 10 . a) If the resistance value is 120 +30/-10 ohm -> CAN bus connection between plug X305 on cable W550 and plug X401 on cable W399 has a problem. -> check wiring from plug X305 on cable W550 to plug X1 on the slip ring pin 2/10 for bad contact or broken wires. -> check wiring from plug X401 cable W399 to plug X2 on slip ring pin 2/10 for bad contact or broken wires. -> If above cable wiring is ok -> the problem is at the back slip ring (measure the continuity between plugs X1 and X2 pin 2/10 on the slip ring , check/change defective brushes....). b) If the resistance value is not 120 +30/-10 ohm -> remove plugs X302, X303, X307, X301, and X300 in sequence. At each of these plugs on the UMAR, measure the resistance between pin 4 and 11 until 120 +30/-10 ohm can be measured. -> If 120 +30/-10 ohm can be measured -> the CAN bus problem is between the last plug measured and the previously measured plug -> find by ohm measurement which part is defective and change the defective part.

5

• Remove plug X305 from UMAR. Measure the resistance at plug X401 on cable W399 pin 2/10 against system ground. a) If the insulation problem still exists -> the insulation problem is between plug X305 on cable W550 and plug X401 on cable W399. Remove parts located between above mentioned plugs in sequence to find the insulation problem. b) If the insulation problem no longer exists -> the problem is somewhere in the rotating part between UMAR and the connected components. Isolate the problem by measuring at plug X305 pin 2/10 on UMAR to system ground while removing plug X300, X301, X307 X303, and X302 in sequence.

TSG CAN bus to XGS

0

CAN bus to XGS The UMAS is the master controller for the CAN bus to the XGS. The CAN bus consists of a closed loop which is routed through XGS-A in PDC-A and XGS-B in PDC-B. The terminal resistor of the CAN bus has a value of 120 ohm and is located inside a dongle. The dongle is plugged in at XGS-B X3. The 2 wires of the loop are named CAN_L and CAN_H. The CAN bus wires CAN_L and CAN_H are routed from the UMAS to XGS-A and XGS-B. Because the CAN bus is a hardwired loop connection (see drawing below) the resistance of the loop can be measured using a multimeter. The resistance at plug X400 on the UMAS

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CAN Bus between pin 2 and 10 must be 120 +30/-10 ohm. Also check that the 2 CAN wires (CAN_l/CAN_H) are insulated from ground. All affected CAN bus components are indicated in the figure below.

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CAN Bus

155

Tab. 55

CAN bus troubleshooting

Step

Action

1

• Switch system off and switch off system power using the onsite off/on switch (power of XGS-A/B is switched off).

2

• Remove plug X400 from UMAS. Measure the resistance at plug X400 on cable W55 between pin 2 and pin 10. a) If the measured resistance value is 120 +30/-10 ohm -> wiring from plug X400 on cable W55 to the 120 ohm bus terminal at X3 on XGS B is ok -> continue with item 3. b) If the resistance value is not 120 +30/-10 ohm -> continue with item 4.

3

• Measure the resistance at plug X400 on cable W55 from pin 2 and pin 10 against system ground. a) If the resistance is > 10 Kohm -> insulation of CAN_H and CAN_L wires against system ground is ok -> no further action necessary. b) If the resistance is about 0 ohm -> insulation of CAN_H and CAN_L against system ground is not ok (short circuit to ground) -> continue with item 8.

4

• Remove plug X4 from XGS-A. Measure the resistance at plug X4 on XGS-A between pin 2 and pin 10. a) If the resistance value is 120 +30/-10 ohm -> CAN bus connection between plug X4 and X400 on cable W55 has a problem. -> check cable W55 for bad contact or broken wires. b) If the resistance value is not 120 +30/-10 ohm -> continue with item 5.

5

• Remove plug X3 from XGS-A. Measure the resistance at plug X3 on the cable W54 between pin 2 and pin 10. a) If the resistance value is 120 +30/-10 ohm -> check plugs X3 /X4 on XGS-A for bad contacts; otherwise, change XGS-A. b) If the resistance value is not 120 +30/-10 ohm -> continue with item 6.

6

• Remove plug X4 from XGS-B. Measure the resistance at plug X4 on XGS-B between pin 2 and pin 10. a) If the resistance is 120 +30/-10 ohm -> check cable W54 for bad contact or broken wire; otherwise, change cable W54. b) If the resistance is not 120 +30/-10 ohm -> continue with item 7.

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CAN Bus Step

Action

7

• Remove plug X3 (including the 120 ohm bus terminal) from XGS-B and measure the resistance at plug X3 (dongle) between pin 2 and pin 10. a) If the resistance value is 120 +30/-10 ohm -> check plugs X3/X4 on XGS-B for bad contacts; otherwise, change XGS-B. b) If the resistance value is not 120 +30/-10 ohm > change dongle plug X3.

8

• Remove plug X3 from XGS-A. Measure the resistance at plug X3 on cable W54 pin 2/10 against system ground. a) If the insulation problem still exists -> the insulation problem is between plug X3 on cable W54 , XGS-B and dongle plug X3 on XGS-B. Remove listed parts in sequence to isolate the insulation problem. b) If the insulation problem no longer exists -> the insulation problem is between plug X400 on the cable W55 and plug X3 on XGS-A. Remove listed parts in sequence to isolate the insulation problem.

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CANopen Bus

157

7-

CANopen Bus

0

TSG CAN open bus

0

7CANopen Bus

The UMAS is the master controller for the CANopen bus. The CANopen bus consists of a closed loop which is routed through certain components (refer to diagram). The terminal resistors of the CANopen bus have a value of 120 ohms and are located inside the SCR and the PHS. In addition, the control box is connected via a “repeater” (part of the UMAS board) to the CANopen bus. Therefore, the control box contains a 120 ohm terminal resistor as well.

NOTE

The CANopen bus can be checked by measuring the resistance of the CANopen circuit.

Fig. 78: CAN open bus Pos. 1

© Siemens, 2009 For internal use only

Image only for reference, not updated when functional description is changed. For details please see functional description.

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CANopen Bus Tab. 56

Sequence to measure the CANopen loop resistance:

Step

Action

1

• Switch off the system and press the service switch S1 in PDC A to switch off gantry power.

• Remove one of the CANopen circuit connectors.

2

For troubleshooting, it is recommended to remove a CANopen circuit connector located in the middle between the two terminal resistors (refer to step 18 of the CANopen pin list). Measure the resistance in both directions from the CANopen circuit. Plug located at the component and the plug located at the cable.

• Measure the CANopen loop resistance between the CANopen_H pin and

3

the CANopen_L pin (refer to the CANopen pin list). The resistance between the CANopen_H pin and the CANopen_L pin must be 120 +30/-10 ohm.

• Measure the ground resistance of the CANopen_H pin and the CANopen_L

4

pin against system ground. Note: The CANopen circuit must be isolated against system ground. The ground resistance must be greater than 10 Kohm.

• If the measurement values (in both directions) are in tolerance, the CAN-

5

open circuit is o.k.

• If a measurement value is out of tolerance, remove the next CANopen connector in the direction where the measurement value is out of tolerance. Repeat the measurements from step 4 and step 5. Tab. 57

Pin list for CANopen bus

Step

Component Connector

CANopen_H pin

CANopen_L pin

Remark

1

SCR

X5

7

2

120 ohm

2

WCS

X4

1

2

3

WCS

X3

1

2

4

UMAS

X472

1

2

5

UMAS

X404

15

2

X308

15

2

6 7

PRR

X1

15

2

8

PRR

X2

15

2

9

PRL

X1

15

2

10

PRL

X2

15

2

11

MV45

X1

15

2

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CANopen Bus

159

Step Component Connector

CANopen_H pin

CANopen_L pin

12

MV45

X1

16

4

13

PRL

X2

16

4

14

PRL

X1

16

4

15

PRR

X2

16

4

16

PRR

X1

16

4

X308

16

4

17 18

UMAS

X404

16

4

17

UMAS

X403

15

2

X307

15

2

18 19

PFR

X1

15

2

20

PFR

X2

15

2

21

DF

X1

15

2

22

DF

X2

15

2

23

PFL

X1

15

2

24

PFL

X2

15

2

25

MV45

X1

15

2

26

MV45

X1

16

4

27

PFL

X2

16

4

28

PFL

X1

16

4

29

DF

X2

16

4

30

DF

X1

16

4

31

PFR

X2

16

4

32

PFR

X1

16

4

X307

16

4

33 34

UMAS

X403

16

4

35

UMAS

X471

1

2

36

PHS

X702

7

2

Remark

120 ohm

CANopen bus repeater (part of the UMAS board) 37

UMAS

X402

10

2

38

Control Box

X1

10

2

© Siemens, 2009 For internal use only

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120 ohm

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160

CANopen Bus

CAN open external bus NOTE

0

The CAN open external bus can be measured in the same way as the CAN open bus. The wire list of the pin connection (e.g. W58) can be opened in the function description.

Fig. 79: CAN open external Pos. 1

Image only for reference, not updated when functional description is changed. For details please see functional description.

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161

8-

Stop report loop

8Stop report loop

0

The stop report loop is a safety mechanism. All controllers are immediately put in into the Stop state when one of them opens the loop or if the loop is opened at any point. The operator can also open the loop by pushing one of the red “STOP” buttons. When the loop opens, radiation and motion stop and all table drive button lights go out. SOMARIS software on the ICS prompts the operator to “Please click CONTINUE.” If no error exists when Continue is clicked, the stand-by state is reached again. The loop is a hard-wired series circuit with a number of contacts (relays and switches). Supplied with 24 V, DC (30 mA) via relays K8 and K6 on the UMAS. Relay K6 (Stop Hold) on the return side is energized as long as power is available at the UMAS. The stop report loop is first closed during Startup or reset (Continue) by firmware closing K7, which supplies K8 coil, for 100 ms. If all the stop-report contacts (controller relays and STOP buttons) are closed during this time, K8 stays energized by its self-holding contact (normal operating state). The firmware on all the controllers also contains a Startup routine that closes their individual stop-report relays for the same time. Opening any of the stop-report contacts disconnects the return path of the coil of K8 to ground, removing power from K8 coil. K8 then holds the loop open until a Reset (Continue) is issued from the ICS via the UMAS firmware. Whenever the loop opens, all the controller's firmware goes into the Stop state until the Reset command arrives at the controllers (Continue). The loop is multiplexed into the fastlink communication as it goes over the slip ring.

Fig. 80: Definition Flash stop report loop Pos. 1

© Siemens, 2009 For internal use only

Image only for reference, not updated when functional description is changed. For details please see functional description.

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Stop report loop NOTE

ADAPTERS ARE REQUIRED TO TROUBLESHOOT (see Note below). For sporadic problems, an oscilloscope is also required.

TSG stop report loop

0

First, make sure the loop is open. (Other problems can cause “Continues” or keep the table drive buttons from lighting up.) Look at the “SR Closed” yellow LED on the UMAS - it is OFF if the loop is open. Try Setup/Continue and a cold system restart. If the loop is permanently open, troubleshoot according to the following process. 1. PERMANENTLY open stop report loop: This method is described in the following TSG. First, order the material numbers below, or obtain breakout boxes (see NOTEs below). The test adapter is inserted into the loop at each UMAS/UMAR connector in sequence. A bridge on the adapter simulates a closed loop on that component. If the stop report loop is closed (system reaches stand-by state) after power on (because of the bridged test adapter). The problem is on the component where you installed the test adapter. If the stop report loop still does not close, the particular component behind the test adapter is OK. Therefore the adapter is then moved to the next location.

NOTE

To troubleshoot the stop report loop, the following SUB-D test adapter plugs are needed (male and female) . You can order the following adapters from stock: 99 00 101 -- 15 pin Sub-D plugs M/F 99 00 127 -- 25 pin Sub-D plugs M/F 46 83 314 --- 9 pin Sub-D plugs M/F If the above adapters are not available, “Breakout Boxes” can be used as a substitute (local source). Make sure that you obtain the types that allow individual pins on the connectors to be bridged/jumpered. If you use a BoB, you may also need up to 6 pln gender-changers. 2 each for 9-, 15-, and 25-pin SUB-D connectors (1 male/male and 1 female/female each), to adapt to the plug polarities.

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Fig. 81: Example of Breakout Box (BoB) with Leads to Bridge/Jumper Pins

Fig. 82: UMAS showing Stop Report Connections

NOTE

© Siemens, 2009 For internal use only

Extreme care must be taken that ONLY the correct pins are bridged, as described in the text below. Bridging the incorrect pins risks serious damage to the hardware when power is applied!

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Stop report loop NOTE

Switch off the UMAS power (with fuse F303 in right gantry stand). When you install and remove a test adapter at the UMAS. Use the Control Box “Computer On” button when working at the UMAR. Failure to do so can risk serious damage to the hardware!

Tab. 58

Stop report troubleshooting for SOLID problem

Step

SOLID PROBLEM -- Actions Follow the below given test steps

A

Check Eventlog for fastlink problems between UMAR and UMAS (MAR/MAS error messages). If there are fastlink problems > follow Troubleshooting Guide given in the error message. If there no fastlink problems > continue with step B.

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Step

SOLID PROBLEM -- Actions

B

Install the test adapters between the following connectors at the UMAS or UMAR. Bridge the pins at the test adapter as described below to simulate a closed loop at the adapter location. Note: Do not forget to connect the removed plug to the test adapter. 1. UMAS X403 (loop pin1 to pin 14 on the test adapter). If the stop report loop is closed after switch on > problem in front cover stop report loop > continue with step C. If the stop report loop is NOT closed after power-on > continue with item 2. 2. UMAS X402 (loop pin1 to pin 9 on the test adapter). If the stop report loop is closed after switch on > problem in the control box stop report loop > continue with item D. If the stop report loop is NOT closed after power-on > continue with item 3. 3. UMAS X404 (check if the stop report loop at rotating part is closed by measurement). Install SUB_D test adapter between X404 connector. Close service switch S8 on UMAS: K8 contact is bypassed, and 24 VDV (30 mA) is supplied to the stop report loop. Measure if approx. 18 V, DC can be measured at pin 1 of the Sub-D plug. - if approx. 18 V, DC can be measured > stop report loop of rotating part is closed > continue with item 4. - if approx. 0V can be measured > stop report loop of rotating part is not closed > continue with item 7. 4. UMAS X404 (loop pin1 to pin 14 on the test adapter). If the stop report loop is closed after switch on > problem in rear cover stop report loop > continue with item E. If the stop report loop is NOT closed after power-on > continue with next step.. 5. UMAS X400 (loop pin 1 to pin 9 on the test adapter). If the stop report loop is closed after power-on > problem in XGS A or B stop report loop path > continue with next step 6. XGS A X3 (loop pin1 to pin 9 on the test adapter). If the stop report loop is closed after switch on > problem in XGS B If the stop report loop is not closed after switch on > problem in XGS A 7. UMAR X302 (loop pin 1 to pin 9 on the test adapter). If the stop report loop is closed after power-on > problem in XGR A stop report loop. If the stop report loop is not closed after switch on > continue with next step.. 8. UMAR X303 (loop pin 1 to pin 9 on the test adapter). If the stop report loop is closed after power-on > problem in XDC A stop report loop. 9. UMAR X300 (loop pin 1 to pin 9 on the test adapter). If the stop report loop is closed after power-on > problem in XGR B stop report loop. If the stop report loop is not closed after switch on > continue with next step.. 10. UMAR X301 (loop pin 1 to pin 9 on the test adapter). If the stop report loop is closed after power-on > problem in XDC B stop report loop.

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Stop report loop Step

SOLID PROBLEM -- Actions

C

• Remove UMAS X403 (to panels, display, MV45, wiring). Measure the resistance of the stop report loop. a) Measure the resistance from pin 1 to 14 (0 ohm) and between ground and pins 1 and 14 (> 10 kohms).

D

• Remove UMAS X402 (to panels, display, MV45, wiring). Measure the resistance of the stop report loop. a) Measure the resistance from pin 1 to 9 (0 ohm) and between ground and pins 1 and 9 (> 10 kohms).

E

• Remove UMAS X404 (to optional panels, MV45, wiring). Measure the resistance of the stop report loop. ¹ The rear control panels (MV45) are optional. If they are not installed, a different cable connects the gantry to the MV45. a) Measure the resistance from pin 1 to 14 (0 ohm) and between ground and pins 1 and 14 (> 10 kohms).

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9-

Network

0

Ethernet switches (located in PDC_A)

0

9Network

Fig. 83: Location of Ethernet switches within PDC Pos. 1

External switch

Pos. 2

Internal switch

Fig. 84: LEDs and connections of Ethernet switch

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Network Tab. 59

Description of LEDs SysKonnect switch from January 2007

Name

Color

Status

Description

Power

Green

Off

Power off

On

Power on

Off

No link established

SPD/LNK/ACT Yellow Yellow Green Green

1GBit/s link established, no data has been transBlinking ferred 1GBit/s link established and data has been transOn ferred On

10 or 100 MBit/s link established, no data has Blinking been transferred 10 or 100 MBit/s link established and data has been transferred

FDX/HDX Green

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Off

Operation in half-duplex mode

On

Operation in full-duplex mode

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Network

169

Troubleshooting network components

0

Overview

Fig. 85: Network components

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Network IP addresses of internal components Component

IP address

ICS

192.168.184.1

IRS

192.168.184.2

GSV (UMAS)

192.168.184.4

PDC (UPS)

192.168.184.10

KVMoverIP

192.168.184.12

Troubleshooting the ICS - IRS connection Test the network connection with Service SW in Somaris/7 1. Select Local Service > Test Tools > IRS > HW Test > network 2. Click Go to start the test 3. If the message “IRS HW test failed" appears, check the event log for further information. Troubleshooting network components with the help of Local HW Tests Step

Action

1

• Start the Local HW Test.

2

• Click Config within the Local Hardware Test window to open the Configuration settings.

Fig. 86: Configuration settings

3

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• Deselect Enable to modify the IP addresses.

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171 Step

Action

4

• Enter the IP address of the tested component in the Destination IP field and the transfer rate in the min MByte/sec field.

Fig. 87: Setting IP addresses

5

• Click Apply and close the window.

6

• In the Local Hardware Test window, select Network and click Start.

7

• Check for errors in the Message window.

8

• In case of an error, check the affected Ethernet path as follows: a) Check the LEDs on the transmitting or receiving component and the Ethernet switch within the PDC_A. b) Check the Ethernet switch by using a different port.

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Rotating controller 10-

Rotating controller tests

0

DOM

0

10Rotating controller

The DOM (Dose Modulation) function is an FW part located on the UMAR. With this test, the function of the Dose Modulation Control on UMAR is tested. During the test, a self test of the DOM controller is performed via the test interface. Remark: Test can be used when the system is or is not in stand-by status. DOM TSG Tab. 60

DOM test

Step

Action

1

Perform the DOM test as described below.

2

If the test fails > check/reload FW > Local service > Control > Firmware update.

3

If the test fails again, change UMAR.

Performing the DOM test 1. Select Local Service > Test Tools > Rot. Controller > DOM 2. Select relevant tests. 3. Click GO and follow the instructions in the dialog. The test is terminated automatically.

COC (Tube collimator)

0

Tube collimator test function The COC test is divided in 4 different test possibilities 1. PHI - Z - monitor Signal test - (only lab) 2. PHI - Z - monitor Signal test - (only lab) 3. Collimator Init test - performs an Init run of the collimator jaws. Additionally, the encoder offset values of the two jaws are shown and written into the COC table of the ICS. Repetitions can be selected to detect sporadic problems. 4. Test of movable radiation filters - the tests move the different filters to their in/out end position. The out/in positions are indicated by 2 LEDs located at the TCO front cover. Repetitions can be selected to detect sporadic problems. The above tests can also be used if the gantry has not reached standby status. For troubleshooting, use the Troubleshooting Guide below.

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173

Tube collimator TSG Tab. 61

Tube collimator TSG

Step 1

Action Perform COC test: Local Service > Test Tools > Rot. Controller > COC. Select the following tests

• • • •

Collimator test A/B Cardio Wedge filter test A/B Body Wedge filter test Tin filter test

a) Check to see whether the collimator jaws are moving. b) Check to see whether the position LEDs of the wedge/tin filters are alternately switching on/off when the in/out end position is reached: ¹ TCO A/B: Cardio wedge filter LED -> F1 POS 1 or F1 POS 2. ¹ TCO A: Body wedge filter LED -> F2 POS 1 or F2 POS 2 or TCO B: Tin filter LED -> F2 POS 1 or F2 POS 2. - if the above conditions are fulfilled > all COC test results are successful -> TCO is OK. - if the TCO jaws are not moving or seem to move incorrectly -> continue with item 2. - if TCO wedge or tin filter LEDs are not alternately switching on/off -> continue with item 3. 2

Perform COC test A or B > 5 times. Compare the 5 “jaw 1” values. ¹ If the difference between several encoder offset values is 3 or smaller -> TCO is OK. ¹ If the difference of the “jaw 1” value is 4 or 5 > repeat COC test > if the difference does not change and COC error messages are found in the Eventlog > replace TCO A or B ¹ If the difference of the “jaw 1” value is more than 5 > replace TCO A or B Compare the 5 “jaw 2” values and follow the same conditions as with “jaw 1”.

3

Select some repetitions in the COC filter test and check the Eventlog for error messages (supply power, ....) which appeared during the filter test. If error messages are found > continue troubleshooting as described in the extended error message.

Performing the COC test 1. Select Local Service > Test Tools > Rot. Controller > COC 2. Select relevant tests. 3. Click GO and follow the instructions in the dialog. The test is terminated automatically.

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Stationary controller 11-

Stationary controller tests

11Stationary controller

0

The system has to be in the standby mode to perform the following controller tests.

Prerequisites

0

n.a.

Master stationary (MAS) test

0

1. Select Local Service > Test Tools > stat.Controller > MAS 2. Select one or all MAS tests. 3. Click “Go”.

Fig. 88: MAS Test

- Footswitch test: Tests the function of the footswitch - Speed test for cooling fan: The fan rotation speed can be set from 0% to 100%. This test can be used to determine noise at a certain fan rotation speed. - Open stop report: This test has the same function as S8 on the UMAS. - Close stop report: This test has the same function as S8 on the UMAS.

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175

Gantry panel control (GPC) test

0

1. Select Local Service > Test Tools > stat.Controller > GPC. 2. Select one or all GPC tests. 3. Click “Go”.

Fig. 89: GPC Test

Rotation control (ROT) test

0

1. Select Local Service > Test Tools > stat.Controller > ROT. 2. Select one or all ROT tests.

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176

Stationary controller 3. Click “Go”.

Fig. 90: ROT Test

Patient Handling System (PHS) test

0

1. Select Local Service > Test Tools > stat.Controller > PHS. 2. Select one or all PHS tests.

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Stationary controller

177

3. Click “Go”.

Fig. 91: PHS Test

CPI (PMM) test

0

1. Select Local Service > Test Tools > stat.Controller > CPI. 2. Select PMM test.

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178

Stationary controller 3. Click “Go”.

Fig. 92: CPI Test

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179

12-

System test

0

DOM functional

0

12System test

The IEC 30 cm water phantom is used for the dose modulation test. After the phantom is positioned correctly, 2 measurements are performed. The first measurement is performed without dose modulation, the second with dose modulation. After each measurement the effective mAs-product is read from the generator table (control table). The images are reconstructed and displayed. After reconstruction, a ROI is positioned in each image and the noise is retrieved. A computation regarding the noise and mAs-product of both images determines whether the dose modulation works correctly or not. If tube arcing occurred, the test is not valid and must be repeated. Function The DAS controller generates a DOM data frame for use in dose modulation functions. A DOM frame is a compressed version of any IRS reading sent to UMAR via Fastlink. The UMAR builds an angular attenuation profile used to modulate on-line the dose profile (Dose) applied to the patient. From the dose profile, the filament data are calculated and sent via Fastlink to the XGR (FilPower). Most of the DOM function in UMAR is software. Remark: Test requires the system to be in stand-by status. DOM functional TSG Tab. 62

DOM functional TSG

Step 1

Action Perform the Dom functional test 5 times. > if the test is out of tolerance at least 3 times > continue with item 2. > if the test is not out of tolerance at least 3 times > no action necessary

2

Perform the DOM test “Local Service > Test Tools > Rot. Controller > DOM” > if the DOM test is out of tolerance > change UMAR > if the DOM test is ok > continue with item 3.

3

Check image quality from normal scans without the selected DOM function. > if the image quality is ok > UMAR DMS communication ok > continue with item 4. > if the image is not ok > troubleshoot fastlink communication UMAR > DMS .

4

Troubleshoot fastlink communication UMAR > XGR .

Performing the test 1. Select Local Service > Test Tools > Sys Tests > DOM Functional 2. Select relevant parameters. 3. Click GO and follow the instructions in the dialog. The test is terminated automatically. If a test fails, follow the TSG described next.

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System test

X-ray timeout test

0

This test checks if the scan is switched off after 108% scan time. Normally a scan is switched on/off only from the XC (X-ray release) signal, which is sent at the beginning of the scan from UMAR to XGS/XGR. For safety reasons, a timer in XGS/XGR is started as soon as the radiation is switched on (> 20 kV) triggered from the XC signal. If the XC signal is not switched off before the internal XGS/XGR timer exceeds its 108% limit, the scan is switched off by the internal timer. If the test fails at CT_GSA/GRA_113 (XGR Scan Time Exceeded) is sent to the Eventlog. Remark: Test requires the system to be in stand-by status. X-ray timeout TSG Tab. 63

X-ray timeout TSG

Step 1

Action Check the Eventlog for the CT_GSA/GRA_113 error message. Follow the instructions given in the extended error message.

Performing the test 1. Select Local Service > Test Tools > Sys Tests > XRay Timeout 2. Select relevant parameters. 3. Click GO and follow the instructions in the dialog. The test is terminated automatically. If a test fails, follow the TSG described next.

Dyn. Collimation

0

In short spirals, a significant fraction of the dose is normally applied during the overscan phases at the beginning and end of the scan. A dynamic shutter can drastically reduce this overscan dose. Effective dynamic shutter requires collimator plates each capable of fully closing the aperture and moving at considerable speed. The only way to prove that the blades are moving correctly in time is to measure the dose length product. With this test, the correct function of the dynamic collimation is checked so that the raw data are checked for expected values after a spiral scan. If the expected values are within tolerance, it is an indication that the dynamic collimation is functioning (blades of TCO are moving correctly). If not, troubleshooting has to start as described below. Remark: Test requires the system to be in stand-by status

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181

Dyn. Collimation TSG Tab. 64

X-ray timeout TSG

Step

Action

1

Perform Dyn. Collimation test (see below) > perform 1 test with minimum and 1 test with a maximum of parameters (granularity > use default). The test result is displayed in a table which is shown after the end of the test. > if the test is not successful (one or more red bars) > save raw data file (E:service/icsraw > DynCol.raw) onto CD and send it to HSC. HSC forwards it to the lab > continue with item 2. > if the test is successful (grey or green bars) > dynamic collimation is ok. No further action.

2

Follow the TCO Troubleshooting Guide > (COC (Tube collimator) / p. 172)

Performing the test 1. Select Local Service > Test Tools > Sys Tests > Dyn Collimation 2. Select parameters (RotSpeed, pitch, table movement, granularity use default) 3. Click GO and follow the instructions in the dialog. The test is terminated automatically.

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Cooling System 13-

Water cooling

0

General

0

13Cooling System

The water cooling system provides heat dissipation for the gantry electronics and X-ray tube. The 3-way bypass valve on the incoming cold water and the variable-speed fan regulate the internal air temperature of the gantry. Both are controlled from the Electronics Box containing control boards and connected to sensors for the water and air. The Electronics Box connects to the system by the CANopen bus. The fan assembly contains its own Fan Motor Control Board which connects to the Electronics Box. The fan in the lower-right gantry stand cools all rotating parts; there are no other fans in the rotating gantry. A condensate-collection system collects condensed water below the radiator and automatically pumps it away to a drain. The condensate pump connects electrically to the electronics box. If the temperature in the gantry or the temperature of the incoming water exceeds limits, the Electronic Box issues messages to the UMAS. For sites using the Water-Air Split Cooling Unit, an interface to it is provided on the electronics box (X6). The following diagrams are from the Function Description.

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183

Fig. 93: Water cooling overview

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Cooling System

Fig. 94: Water circuit

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185

Fig. 95: Electrical circuit

TSG Water Cooling

0

General troubleshooting process steps: 1. If possible, try to determine if the problem is EXTERNAL or INTERNAL to the gantry. Check the eventlog. Current Cooling State shown in Table T00, and LEDs on the Electronics Box. If the problem appears to be external, seek possible resolution in Hospital/Facility-Chilled Water System or with Split Air/Water Unit (Option). Continue to evaluate the internal gantry conditions if the external ones are verified as OK or cannot be determined immediately. 2. If the problem is INTERNAL to the gantry, look at the eventlog. Current Cooling State shown in Table T00, observe the LEDs on the Electronics Box. Use the laptop service connection to the Electronics Box described below. 3. Replace suspected defective parts. Information sources The following sources of information about the source for cooling problems are available:

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Cooling System 1. Messages in the eventlog: Review the eventlog for warning and error messages from the WCS, and troubleshoot based on these errors. You can filter the eventlog on the text “COOLING” to see only cooling errors. ¹ If you cannot access the eventlog for any reason, you can connect a service laptop directly to the Cooling Electronics Box (# 4 below). The following 2 INFORMATION messages in the eventlog are useful to determine possible changes in the cooling conditions. Even if there are no warning or error messages.

NOTE

These messages are INFORMATION-priority. Switch on the INFO messages to display them in the eventlog. Also, they are only generated when a certain amount of change has occurred. For a readout of the current state of these values, see Step 2, “Table T00” shown below.

Message about the ENVIRONMENT/PRIMARY SIDE:

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187

Fig. 96: Message MAS220

Message about the COOLING SECONDARY (GANTRY) SIDE:

Fig. 97: Message MAS212

To determine what value is being displayed, look at the P1 value in the actual message shown in the eventlog. Find this HEX number on the list of “Parameter 1: Supervision ID numbers” in the expanded message (above). P3 & P4 show the actual value in HEX.

NOTE

© Siemens, 2009 For internal use only

It is necessary to convert HEX to decimal to read the value. Use the Windows Calculator in the Scientific mode (WinXP Programs > Accessories > Calculator > View > Scientific). Click HEX button to enter the values of P3 and P4, then press DEC button. Remember that temperature values are given in 1/10th degree (e.g., 247 = 24.7 degrees C).

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Cooling System 2. Current system cooling status using table T00: Using the Service Software function Control > Table Load/Modify, open table “T00” from “Volatile.” The current state of the various sensors is shown in the data fields of T00. Compare the current state to the nominal values shown in the following screenshot to determine if the actual values displayed reveal any strong deviations.

NOTE

DO NOT change the values in any of the tables!

Fig. 98: T00 table for water cooling

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189

3. LEDs on WCS electronics box: The 3 LEDs at the left side of the Electronics Box are status indicators. In the normal mode of operation, only the green LED (H1) flash. The yellow LED (H2) is illuminated if a warning (e.g. temperature out of tolerance) occurs. And also briefly lights whenever the control board is switched on (initialization). During an error condition (e.g., fan error), the red LED (H3) is on continuously. 4. Additional information: Laptop service connection to electronics box NOTE

All messages mentioned below are sent to the Eventlog. Use the laptop connection only if you are familiar with a terminal emulator program.

Note: All messages mentioned below are also sent to the Eventlog. Use the Laptop connection only if you are familiar with a terminal emulator program. Connect the laptop PC serial port to the Service connector. On the Electronics Box with a null-modem cable and running a terminal emulator program such as HyperTerminal. Example: >sta >UpTm: 54:46 C:1 E:0 LE:250 I/Yf:6000/290 LA:200 I/Ym:0/0 Pos:0WE: 100 WA:150 FS:584 The number after the letter E: indicates the warning or error message code. E:0 indicates no warning or error. Warning Alarms (YELLOW LED on Electronics Box illuminated):

© Siemens, 2009 For internal use only

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Cooling System Code 10 / 110

Warning messages via the laptop Cooling unit exhaust air temperature (into gantry) to low

• Control valve - electrical connection is faulty - Check wiring connection at valve.

• Control Valve is not working - Try turning the valve knob manually, see if it “responds” by returning to its original position. If so, probably OK (repeat several times). If it does not return to its original position, replace valve drive unit, electronics box, sensors, valve. 11 / 111 20 / 120

Exhaust air temperature of cooling unit (into gantry) is too high

• Same cause/action as code 10 above. Hospital supply water temperature is too low (30 degrees C).

• Gantry temperature regulation is not working properly. Verify the sensor connection (if not connected, this error results). Replace: control valve drive / control valve, electronics box, sensor, fan (if not blowing).

Error Alarms (RED LED on electronics box illuminated):

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Cooling System

191

Code 210

Warning messages via the laptop Error in fan controller

• Fan connection to the electronics box is not connected. Check the electrical connection between fan and Electronics Box (connectors 1X1 and 1X2).

• Fan bearing has seized. Check that the fan rotor turns easily - DISCONNECT FAN POWER before touching the fan blades.

• Controller or fan has failed - replace fan assembly. 220

Spirit level in condensate pan is too high

• Check spirit level in condensate pan, function of the condensate pump and switch, and make sure that the clear hoses are OK. Verify the electrical connection of condensate pump to Electronics Box (connector 1X3). 230

Fan speed too low

• Check connection between electronics box and fan (connectors 1X1 and 1X2). Replace Electronics Box, fan assembly. 1010 / Sensor R1 error: exhaust air temperature to gantry 1011 • Check/replace sensor R1, connector 2X4. 1020 / Sensor R2 error: air inlet temperature from gantry 1021 • Check/replace sensor R2, connector 2X4. 1050 / Sensor R3 error: water outlet temperature or flow 1051 • Verify the proper temperature and adequate flow of incoming hospital water. Check/replace sensor R3, connector 2X4. 1060 / Sensor R4 error: water inlet temperature 1061 • Verify the proper temperature of incoming hospital water. Check/replace sensor R4, connector 2X4.

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PDC_A cabinet 14-

General overview

14PDC_A cabinet

0

The PDC can be divided into 3 separate functions:

• Power distribution located in the lower part of the PDC • XGS located in the upper part of the PDC • UPS located at the lower right (standard component in the PDC) The PDC cabinet is always delivered with the power matching transformer T1:

• Transformer T1 adapts the on-site line voltage (380 V to 480 V) to internal 400 V.

Fig. 99: PDC cabinet - overview Pos. 1

Schematic overview

Pos. 2

Detailed overview

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Power distribution

14.1

The power distribution in the PDC cabinet distributes the line voltage power at the required adapted voltages to all system components and their subsystems.

Errors and troubleshooting hints

0

As a result, an error in the power distribution can generate various errors at different system components. Refer to the following table for actions based on the type of error. Tab. 65

Table of possible errors and hints

Error

Cause

Action

Complete system does not come up (UPS may supply power to ICS/IES/IR S for ~30 minutes)

F1 tripped

Switch ON circuit breaker F1 and monitor its function.

• If F1 does not trip again: ¹ RCD F18 (yellow box) detected >50% leakage current once. - Check for unstable facility incoming power - Check on-site cabling - Check cabling in PDC - Check cabling from the PDC to the subsystems - See also (Residual current monitor F18 / p. 199)

• If F1 trips again: ¹ RCD F18 (yellow box) detects >50% leakage current continuously. - Check ALARM LED (yellow) at F18 (LED does not blink, only goes ON for a short time). - Check for unstable facility incoming power - Check on-site cabling. - Check cabling in PDC - Check cabling to sub-systems ¹ Relay K2 is faulty (T1 temperature sensing) - Check LED on K2 while switching ON F1 ¹ T1 transformer temperature is too high, holding K2 off (T1 Temp switch or wiring open). ¹ Overcurrent between F1 and T1, e.g. faulty isolation, short circuit at connection terminal T1. F20 tripped

© Siemens, 2009 For internal use only

24-V power supply U1 is faulty; see (24 Volt power supply for U1 / p. 204) for more information.

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PDC_A cabinet Error

Cause

Action

No function Circuit breaker Switch ON the circuit breaker for the system component in individfor the compo- and monitor its function. If the circuit breaker trips again, ual system nent is tripped the power input of the component is defective. Troublecomposhoot the component. nents • Check where the supply voltage of the relay comes Relay for the from (in the Function Description) and determine what component is circuit breakers or other relays supply it. not switching on ICS, IES, UPS not com- • IRS, UMAS ing on not coming • on

Check if the UPS power switch is on (LEDs on front of UPS). Check F10 (UPS Input) and F16 (UPS Output).

• Check whether the circuit breakers at the back of the UPS have tripped; see (Fig. 110 / p. 207).

• See (UPS / p. 206) for more information. LEDs OFF at all protection devices (Pos. 8 in (Fig. 100 / p. 195)

F12 tripped

Switch ON circuit breaker F12 and monitor its function:

• If F12 does not trip again ¹ Test function of F18 with the TEST switch. ¹ Check LEDs of K1, K2, K12, F18.

• If F12 trips again ¹ Check cabling and components that are connected to K1, K2, K12, F18, shunt trips at certain circuit breakers.

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Overview

0

Fig. 100: Power distribution in PDC_A - overview Pos. 1

Fuses F1, F2, F4, F5, F6, F3 (from left to right)

Pos. 2

Service push-button S1

Pos. 3

Relays K24, K23, K22, K21, K20, K19, K18, K17, K16, K15, K14, K11, K7, K6, K5 (from left to right)

Pos. 4

Relays K25, K10, K9, K8, K3 (from left to right)

Pos. 5

24 Volt power supply for U1

Pos. 6

Fuses F7, F8, F9, F10, F11, F12, F13, F14, F15, F16, F17, F20, F21, F22 (from left to right)

Pos. 7

Overvoltage protection

Pos. 8

Residual current monitor F18; relays K2, K1

Pos. 9

Line voltage terminal for on-site power cable

Pos. 10

Service power socket X140, X141; power sockets X108, X109 for Ethernet switches

Pos. 11

Transformer T1

Pos. 12

UPS incl. accumulator pack (behind cover)

Pos. 13

External Ethernet switch

Pos. 14

Internal Ethernet switch

Circuit breakers and relays

0

• Refer to (Fig. 101 / p. 198) for the locations of the circuit breakers and protection devices.

• Refer to (Fig. 102 / p. 199) for the location of the relays.

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PDC_A cabinet • Refer to (Fig. 100 / p. 195) for a general overview of the location of the circuit breakers and relays. Notes

• Check by measuring the voltage at the connection point of every component/ subcomponent to see whether: - The component/ sub-component does not work. - The supply voltage for a certain component / subcomponent is missing. - A corresponding error message is generated. The following table shows the circuit breakers, relays, and connection points required to switch ON/OFF and to protect some system components independently: Tab. 66

Circuit breakers and relays - primary

Connected load

Circuit breaker

via relay

Connection /check point

Entire PDC

F1 1, F18 2

n.a.

Pin 2/4/6 of F1

XGS

F2

n.a.

Pin 1/3/5

1. Line voltage circuit breaker 2. Only active if F12 (secondary) is ON Tab. 67

Circuit breakers and relays - secondary

Connected load

Circuit breaker via relay

Connection /check point

All sub-systems /components

F4

n.a.

Pin 1/3/5

UPS input

F10

n.a.

X108, Pin A1, A2 (N)

Patient table PHS

F7

K7

X101, Pin 1, 2 (N)

Cooling unit 1

F3

K11

X103, Pin A1, A2, A3, B1 (N)

Gantry, stationary part

F6

n.a.

X100, Pin A1, A2, A3, B1 (N) 2

Gantry, rotating part F5

K83, K9 /K104

X102, Pin A1, A2, A3, B1 (N)

Service socket 5

n.a.

X140, L1/N

F9

(230 V, AC)

X141, L1/N

REPO contact

F20

K3

X20, Pin 5.1/5.2

Service socket 6

F21

K5

X111, Pin 1/2 (N)

(230 V, AC) 1. Integrated in gantry 2. Note: Pin B3 is still under voltage via the UPS although F6 has tripped or is switched OFF 3. Switches permanent power for rotating part of the gantry

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4. Charge circuit for rotating generator 5. Type: Schuko 6. Type: Schuko Tab. 68

Circuit breakers and relays - components supplied by the UPS

Connected component

Circuit breaker

via relay

Connection /check point

All components

F16

n.a.

X109, Pin A1, A2

Ethernet power socket_11

F11

K3

X106, Pin L1/N

Ethernet power socket_2 2

F17, F14

K3, K5

X107, Pin L1/N

ICS

F17, F13

K3, K5

X104, Pin 1/2

IES

F17, F14

K3, K5

X110, Pin 1/2

IRS

F17, F15

K3, K6

X105, Pin A1, A2

UMAS

F11

K3

X100, Pin B3, B1

Power supply XGS

F11

K3

X003, Pin 2/3/4 (PE)

Power supply 15/24 V for XGS_Control

F22

K3

X159, L/N

(connected to the UPS)

(shutter receptacle)

1. Type: Schuko 2. Type: Schuko

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198

PDC_A cabinet

Fig. 101: Circuit breakers and protection devices in PDC - locations Pos.

F1 (circuit breaker)

Pos.

F2 (circuit breaker)

Pos.

F4 (circuit breaker)

Pos.

F5 (circuit breaker)

Pos.

F6 (circuit breaker)

Pos.

F3 (circuit breaker)

Pos.

S1 (service push-button)

Pos.

Designation from left to right: F7/F8/F9/F10/F11/F12/F13/F14/F15/F16/F17/F20/F21/F22 (circuit breakers)

Pos.

F19 (varistors and overvoltage protection)

Pos.

F18 (residual current monitor)

Pos.

K2 (coupling relay)

Pos.

K1 (time relay)

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199

Fig. 102: Relays in PDC - locations Pos. 1

Relays K24/K23/K22/K21/K20/K19/K18/K17/K16/K15/K14 (from left to right)

Pos. 2

K11

Pos. 3

K7

Pos. 4

K6

Pos. 5

K5

Pos. 6

K25

Pos. 7

K10

Pos. 8

K9

Pos. 9

K8

Pos. 10

K3

Residual current monitor F18

0

F18 is a residual current monitor. It monitors the 3 input phases of the system via T2 (current transformer) for symmetry. The resulting current of the 3 phases and the corresponding neutral (to and from the system) must be zero.

• If the resulting current exceeds a certain value, the power supply is switched OFF via the current circuit breaker F1.

• A warning is generated if 50% of the error current is present for at least 2 sec. • Refer to (Fig. 103 / p. 200) for illustration of F18. • Refer to (Fig. 100 / p. 195) for a general overview of the location of F18.

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200

PDC_A cabinet Tab. 69

Residual current monitor F18

Indicator

Status

Function

LED “ON”

ON

Monitor in operation.

LED ”ALARM”

BLINKING

Leakage current is ≥ 50%.

OFF

Leakage current is < 50%.

Test switch

PUSHED

Generates a leakage current into T2 and must switch OFF circuit breaker F1 immediately.

Reset switch

PUSHED

ALARM LED can be reset with the RESET switch to check if the error is reproducible.

Fig. 103: Residual current monitor F18 Pos. 1

TEST button

Pos. 2

LED “ON” (green)

Pos. 3

LED “ALARM” (yellow)

Pos. 4

RESET button

Service pushbutton S1

0

• Refer to (Fig. 100 / p. 195) for a general overview of the location of S1. • Refer to (Fig. 104 / p. 201) for the illustration of S1. The PDC has a service push button S1 that switches OFF the following circuit breakers remotely:

• F6/ F11 (stationary part of the gantry; including UMAS) • F5 (rotating part of the gantry) • F2 (stationary generator XGS) • F3 (cooling unit)

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201

• F7 (patient table) - F7 enables (F1 must be switched ON) and allows the patient table to be used as a lifting device while replacing components of the rotating gantry. Collision protection is disabled!

NOTE

When switched OFF via the S1 push button, manually switch on each of the above-mentioned circuit breakers in the PDC.

Fig. 104: Service push-button S1 Pos. 1

Service push-button S1

Pos. 2

Push-button

WARNING

[ hz_serdoc_F13G01U11M01 ]

Use of the service-enable switch (table) disables collision protection. Risk of accident and injury! ¹ Be careful when moving the table.

Relays K1, K2

0

• Refer to (Fig. 100 / p. 195) for a general overview of the location of K1 /K2. • Refer to (Fig. 105 / p. 202) for the illustration of K1 /K2.

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202

PDC_A cabinet Tab. 70

LEDs of K1, K2 - normal operational status

LED

Green

Yellow

Yellow

Function

K1

n.a.

OFF

OFF

Time delay relay

K2

n.a.

ON

n.a.

Relay

Fig. 105: Relays K1/K2 - Status LED Pos. 1

Coupling relay K2

Pos. 2

Time relay K1

Pos. 3

Status LED

Line voltage circuit breaker test

0

• Refer to (Fig. 106 / p. 203) for the illustration of F1. • Refer to (Fig. 100 / p. 195) for a general overview of the location of F1. • Refer to (Fig. 105 / p. 202) for the illustration of K1 /K2. The following test description contains a general test of the

• Line voltage circuit breaker • Leakage current

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Test description: 1. Switch on the power using the on-site ON/OFF switch. ¹ Make sure all computers (ICS, IRS, and IES) are switched OFF. ¹ Make sure F12 is switched ON; otherwise, line voltage circuit breaker F1 cannot be deactivated remotely. 2. Check the status of the K1 /K2 LEDs . ¹ If one of the LEDs has the incorrect status, switch the power OFF and ON using the onsite ON/OFF switch. If the problem persists, check all the wiring or the function of certain relays. 3. If the status of the LEDs is o.k., press the test button of F18 and hold for at least 1 s. ¹ The line voltage circuit breaker F1 must trip off to the middle position “Tripped”. 4. To switch on line voltage circuit breaker F1, first move the circuit breaker to the OFF position and then to the ON position (requires extended pressure). 5. Check the status of the K1 /K2 LEDs again.

NOTE

If circuit breaker F12 is switched off, line voltage circuit breaker F1 cannot be deactivated remotely.

Fig. 106: Circuit breaker F1 Pos. 1

“ON” position

Pos. 2

“OFF” position

Pos. 3

“TRIPPED” position

Circuit breaker F12 (task)

• Refer to (Fig. 107 / p. 204) for the illustration of F12.

© Siemens, 2009 For internal use only

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204

PDC_A cabinet • Refer to (Fig. 100 / p. 195) for a general overview of the location of circuit breaker terminals F7 to F20. Circuit breaker F12 supplies the following parts:

• • • •

Voltage for F18 Current loop around transformer T1 Temperature safeguard for transformer within T1 Shunt trips at circuit breakers F1, F2, F3, F5, F6, F7, F11

Fig. 107: Breaker F12 - location Pos. 1

Breaker F12

Service power socket

0

Power sockets (X140, X141) are available in the PDC to connect electrical service devices.

• Refer to (Fig. 100 / p. 195) to see the location of X140, X141.

24 Volt power supply for U1

0

• Refer to (Fig. 108 / p. 205) for the illustration of the 24-V power supply. • Refer to (Fig. 100 / p. 195) for a general overview of the location the 24-V power supply. Tab. 71

LEDs of 24-V power supply

Indicator

Color

Status

Function

LED “DC ON”

Green

ON

DC is available.

LED ”ALM”

Red

ON

DC overload

Tasks

• Provides the extended voltage, e.g., for radiation warning indicator. • Is the power supply for the UPS REPO relay.

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PDC_A cabinet Tab. 72

205

Measurement points of 24-V power supply

Voltage designation

Measurement point

AC (input 230 V, AC)

L/N

DC (output 24 V, DC)

+V / -V

Tab. 73

Troubleshooting 24-V power supply

LED

Status Possible cause

Action

“DC ON”

OFF

”ALM”

ON

1. Disconnect all external loads at X20, except EPO.

Short circuit or overload at output (pos. 3 in (Fig. 108 / p. 205))

2. Check function of the LEDs. 3. Check the connected load and wiring if there is no change to the LED status. ¹ If no error can be determined in the connected load and wiring, relay K3 could be faulty.

“DC ON”

OFF

”ALM”

OFF

No AC input at connector L/N, pos. 2 in (Fig. 108 / p. 205).

Check if F20 is tripped.

AC input is present.

Power supply is faulty.

Fig. 108: 24 Volt power supply for U1 Pos. 1

24 V power supply

Pos. 2

AC input

Pos. 3

DC 24 Volt output

Pos. 4

LED “DC ON” (green)

Pos. 5

LED “ALM” (red)

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206

PDC_A cabinet

UPS

0

For troubleshooting, it is not required to bypass.1 the UPS manually. An automatic bypass function is provided by the UPS and is executed automatically in case of an internal error. This mode is indicated with a yellow LED at the UPS display.

• Refer to (Fig. 109 / p. 206) for the illustration of the UPS. • Refer to (Fig. 100 / p. 195) for a general overview of the location of the UPS.

Fig. 109: UPS - with and without cover Pos. 1

UPS with cover

Pos. 2

UPS unit

Pos. 3

Accumulator unit

Pos. 4

UPS without cover

Pos. 5

Accumulator packs

Pos. 6

Safety clamp

Status of the LEDs 1. Check the status of the LEDs on the UPS display as follows: Tab. 74

UPS - LED status

LED

Status

AC INPUT

ON

Battery

OFF

UPS ON

ON

1. Bypass means: INPUT and OUTPUT are bridged (dynamic bypass)

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LED

Status

Battery symbol

All LEDs are “ON” 1

Balance symbol

First LED is “ON” 2

1. The accumulator level indicators display the approximate accumulator capacitance at all times. 2. The load level indicators display the approximate electrical load placed upon the UPS at all times.

2. If LED “AC INPUT” or LED “UPS ON” is in status OFF ¹ Check circuit breaker F10 (UPS input). ¹ Check whether the circuit breakers (pos. 1) at the back of the UPS have tripped.

Fig. 110: Breakers - back of UPS Pos. 1

Breakers

NOTE

© Siemens, 2009 For internal use only

Use the operator manual from the UPS manufacturer (delivered with the CT system) for additional detailed information and troubleshooting.

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208

Bad motor controller after corrupted FW update 15-

Information for systems with SOMARIS/7, versions below VA40

15 Bad motor controller after corrupted FW update

0

If an update of the motor controller or its configuration file is aborted part way through (due to interruption of power supply, a dropped FastLink connection, etc.), the frequency converter will no longer be reachable. No service measure is available in the field to solve the problem. The frequency converter has to be replaced.

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Bad motor controller after corrupted FW update

209

Work steps for systems with SOMARIS/7, versions VA40 and higher

15.1

If the update of a motor controller is interrupted, it is possible to re-install the firmware. To start a new update, switch the system off and then on again: 1. Switch the system to the COMP/ON status at the control box. 2. Switch the system to the SYSTEM/ON status at the control box. 3. To load the firmware, run the tune-up sequence for the affected controller under Local Service > Tune-up > FRU Replace.

© Siemens, 2009 For internal use only

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210 16Changes to Previous Version

Changes to Previous Version 16-

Chapter

Change

Reason

3

Disabling of the UHR comb and service switches added

TD_Charm_11561

3

Information about new DMS type and table added

Change_537863

3

Troubleshooting of DMS power supplies corrected/extended

TD_Charm_11562

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Index H

211 17Index

hz_serdoc_F13G01U03M01 . . . . . . . . .9 hz_serdoc_F13G01U05M03 . . . . . . . . .9 hz_serdoc_F13G01U06M01 . . . . . . . . .9 hz_serdoc_F13G01U11M01 . . . . . . .201 hz_serdoc_F13G01U12M0321, 64, 103, 129 hz_serdoc_F13G01U13M02 . . . . . . . . .9 hz_serdoc_F13G02U01M01 . . . . . . . .10 hz_serdoc_F13G02U01M04 . . . . . . . . .8 hz_serdoc_F13G05U01M04 . . . . . . . .10 hz_serdoc_F13G07U01M01 . . . . . . . . .8

© Siemens, 2009 For internal use only

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Index

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