User Manual Accuchek ERS Meter

User Manual

Accuchek +

Secure Meters Limited Post Box 30, ‘E’ Class Industrial Area Pratap Nagar, Udaipur – 313 003, INDIA Phone: +91-294-492300 to 04. Fax: +91-294-492310

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Table of C ontents User Manual

1

1

3

General 1.1 1.2

2

Accessories Optional

3 4

Overview 2.1 2.2

4

Measurement Range Description of Front Panel

4 5

3

Keyboard Operations

8

4

Connection Diagram

11

5

Operating Instructions

14

5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9

Making connections Power up General Information display Meter Type Selection (Configuration) Connection Check Single-phase Testing Calibration Pulse Rate Ready mode Data Entry

14 14 14 15 16 17 17 17 17

6

Calculation of CT and PT ratio

24

7

Perf orming a Test

26

8

Reading Data

31

9

Dosage Testing

32

10

Printing Data

33

11

Important Precautions

34

12

Appendix A: Printer Details

36

13

Appendix B: Opto Scanner Details

37

13.1 13.2 13.3 14 14.1 14.2

Optical Specifications: Input and output: Physical Characteristics:

37 37 37

Appendix C: Technical Specifications

38

Accuchek HT+ With 1A & 5A Current Range Accuchek LT+ With 1A, 5A Current Range and Clamp-On CT

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38 39

1

General

Though the operation of Accuchek + is simple, we do recommend a thorough reading of this manual before you start operations. Accuchek HT+ and Accuchek LT + models together referred as Accuchek +. Term MUT is used for Meter Under Test in this manual. Accuchek + with Error Calculator is used to check the accuracy of electricity meters (both Electro-mechanical and static type) or for measurements where electrical energy and power have to be measured with a high accuracy. It may be used with phantom load sets or on real loads. This can be used for testing the accuracy of meters on site to applications with Meter Test Systems in laboratories as a reference standard. Accuchek + performs the following functions: 1. 2. 3. 4. 5. 6. 7.

Tri-vector Energy measurement (e.g. Wh, VArh lag, VArh lead and VAh). Display of instantaneous electrical parameters (updating every second). Display of calculated error of meter being tested (in 0.01 % resolution). Storage of 200 tests data in its Non-Volatile Memory. RS 232 interface for connection to a PC or printer. Maintains Real time (in built RTC). Dosage testing.

Accuchek + is available in two models, HT+ and LT+. Accuchek HT+ model is useful for checking errors of 2 x 110 Volt (3Phase3Wire) meters and 3 x 63.5 Volt (3Phase-4Wire) meters of 1A and 5 A current ranges. While Accuchek LT+ model is suitable for checking errors of, LT CT operated 3 x 240 Volt meters of 1A and 5 A ranges and direct current meters using clamp-on CT. It is possible to check system accuracy by direct connecting clamp-on CT on lines. Check the suitability of Clamp-on CT, based on its current rating. The Accuchek + with Error Calculator, when shipped from factory includes the following items. 1. 2. 3. 4. 5.

Certificate of calibration. Four spare fuses. (200mA slow blow 20 mm) User Manual Floppy diskette with Accuchek BCS installable software Accuchek BCS Manual

Accessories

1.1

Following accessories are supplied along with Accuchek. They should be kept in the appropriate pockets, inside the top cover for easy storage, carrying and handling . 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11.

A snap-switch with cord. Voltage connecting cord RED, YELLOW, BLUE and of BLACK color with injection type clips. Earthing (grounding) cord of GREEN color with crocodile clip. Communication cord, 9-pin female (PC end) to 9-pin male (Accuchek end). Set of three Clamp-on CTs of R, Y & B phase with flexible coiled cord and circular male 8-pin connector with Accuchek LT+. Insulated current cable with circular male 6-pin connector (of 1A) for current connection. Converter cable link for connecting current cable on 5A circular female connector (to enable use of same current cable on 5A range). Optical scanner head with mounting clamps Meter communication cord (9-pin male D port at one end & PACT port at the other end) Dosage Port Adapter to power up the equipment in the office ( Input 240 V AC, 50 Hz , Output 240 V for LT+ model and 63.5 V for HT+ model )

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1.2

Optional 1. Printer and its accessories

2

Overview

Accuchek + with Error Calculator portable Energy Meter Calibrator comes to you in a sturdy and handy Aluminum case. The instrument is sturdy and will generally withstand the rough handling it will encounter in the field. However, reasonable care in handling will ensure a long trouble free service.

2.1

Measurement Range

Different measurement ranges are available on Accuchek + as shown below. It is also available with combination of range(s) or all the ranges in a single HT\LT instrument. User should check the range(s), which his/her Accuchek + has and read the instructions accordingly. A

Accuchek HT+ • •

3-Phase 3-Wire (2 x 110 Volt) with 1A, 5A. 3-Phase 4-Wire (3 x 63.5 Volt) with 1A, 5A.

Accuracy on different current ranges is as follows: • • B

1 Amp (Accuracy class 0.2S) 5 Amp (Accuracy class 0.2S)

Accuchek LT+ • •

3-Phase (3 x 240 Volt) with 1A, 5A and Clamp-on CT 1-Phase(1 x 240 Volt) with 1A, 5A and Clamp-on CT

Accuracy on different current ranges is as follows: • • •

1 Amp (Accuracy class 0.2S) 5 Amp (Accuracy class 0.2S) Clamp-on CT of 100 A / 150 A / 200 A / 300 A / 500 A (Accuracy class 0.5S, other current ratings on request)

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2.2

Description of Front Panel

FIG 2.1 Accuchek LT + A 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31.

Part Description: Accuchek LT+ Mode selection switch 1Phase - Off - 3Phase Three fuses 200 mA slow blow for R, Y & B phase Sockets for voltage connection R, Y, B, Neutral and Earth Socket for 240 volt A.C. portable printer power supply ( optional) Dosage port 2-pin male circular connector( 240V AC , 5VA) Four pin male circular connector for Snap-switch or Opto-Scanner connection D-type 9-pin female connector for PC or portable printer or meter communication Female circular connector 8-pin for Clamp-on CT connection Female circular connector 6-pin for 1A current connection Female circular connector 7-pin for 5A current connection LCD, 20 character x 4 line, back-lit display Red calibration LED Keyboard, 16 keys Clamps for Opto-scanner fixing on MUT (14a,14b & 14c) Opto-scanner with flexible cord and 4-pin circular female connector Snap-switch with flexible cord and 4-pin circular female connector (16a) Converter cable link for connecting current cable on 5A circular female connector. [circular male connector, 8 pin (17a) at one end & circular female connector 6-pin (17b) at the other end] Set of three clamp-on CTs with spiral cord (18b) and circular male connector 8-pin (18a) Flexible voltage connection cords, RED for R-phase, YELLOW for Y-phase, BLUE for B-phase, BLACK for neutral and GREEN for earth connection. Current connection cable with circular male connector 6-pin on one end for 1A connection, same cable should be used for 5A current connection with converter cable link (17). Printer cord 9-pin male (Accuchek end) to 25-pin male (printer end) - Optional Meter communication cord 9-pin male (Accuchek end) to PACT port (MUT PACT port) Pocket for keeping RED voltage cord with injection clip Pocket for keeping YELLOW voltage cord with injection clip Pocket for keeping BLUE voltage cord with injection clip Pocket for keeping BLACK voltage cord with injection clip Pocket for keeping GREEN Earthing cord with crocodile clip Pocket for keeping current cable (20) and converter cable link (17) Pocket for keeping Snap-switch with flexible cord Pocket for keeping PC communication cord and printer communication cord PC cord 9-pin male (Accuchek end) to 9-pin female PC end (Not shown in the figure 2.1) 5 of 39

FIG 2.2: FRONT FACE OF Accuchek HT+ B

Part Description: Accuchek HT + 1. 2. 3. 4. 5. 6. 7. 9. 10. 11. 12. 13.

Mode selection switch 2 x 110 Volt - OFF - 3 x 63.5 Volt Three fuses 200 mA slow blow for R, Y & B phase Sockets for voltage connection R, Y, B, Neutral and earth Socket for 240 Volt A.C. portable printer power supply (not fitted in the fig)-optional Dosage port - 2 pin male circular connector (240V AC, 5VA) Four pin male circular connector for Snap-switch or Opto-scanner connection D-type 9-pin female connector for PC or portable printer or meter communication Female circular connector 6-pin for 1A current connection Female circular connector 7-pin for 5A current connection LCD, 20 character x 4 line, back-lit display Red calibration LED Keyboard, 16 keys

All the accessories are common for the Accuchek HT+ and the Accuchek LT+ , except the set of three clamp-on CTs. Accuchek LT+ has high current clamp-on CTs, shown in fig 2.1. Refer figure 2.1 for accessories details. The Accuchek LT+ with Error Calculator picture and its accessories are shown in the figure 2.1 and Accuchek HT + front face is shown in the Figure 2.2.

1. Mode selector switch: Accuchek LT + : In this mode selector switch has option to select 1-phase / OFF/ 3-phase. Select 3-phase if you want to test 3-phase meters and 1-phase if you want to test single-phase meters. Accuchek HT+: In this mode selector switch has option for 2 x 110 V-OFF- 3 x 63.5 V (3P3W-OFF-3P4W) modes. For testing 3 phase 3 wire, (2 x 110 Volt) meter, select this option else select 3 x 63.5 Volt option for testing 3 phase 4 wire (3 x 63.5 volt) 2. Fuses: Three fuses, one each for R, Y and B phase.

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3. Voltage connection: Through flexible voltage cords, RED for R-phase, YELLOW for Y-phase, BLUE for B-phase, BLACK for neutral and GREEN for earth connection. 4. Display: 20 Character x 4 Line, LCD back lit display at the top. Each character is made up from 5 x 7 dot matrix. 5. Keyboard: A Sixteen key keyboard, which is used to make entries, starting and aborting a test. This also enables the user to cycle through the display to read-out the instantaneous values of phase voltages, curren ts, power factor, frequency, load & phase sequence. 6. Snap-Switch/Opto-scanner: An extendable snap switch with long cord is provided to operate the instrument while counting the revolutions of MUT. A 4-pin circular female connector is there on the other end of snap-switch cord, which can be connected to the connector on the Accuchek + labeled 'PULSE/SNAP'. Same port should be used for Opto-scanner connection. 7. Current connection: for 1A current connection, connect the 6-pin male circular connector of current cable on to the circular female 6-pin connector of Accuchek+ . Connect the wires at the other end of current cable in series with the MUT current circuit. For 5A connection, connect the 7-pin male circular connector end of converter cable link to the 5A connector (7-pin circular female connector) of the Accuchek +. Other end of converter cable (6-pin male circular connector) should be connected to the current cable. For clamp-on CT connection, connect 8-pin male circular connector to the 'CLAMP ON CT' labeled 8-pin female circular connector of the Accuchek+ . Voltage cords with detached injection clips should be kept in their respective pockets. Wire harnesses of clamp-on CTs should be kept in the space at the right-front side of the case. Three clamp-on CTs, Optical scanner, and its fixing clamps should be kept in the specially made profile sheet at the right hand side of the case. Note: Do not connect 1A/5A and clamp on CT simultaneously on the Accuchek +. 8. Calibration LED: By default it blinks for Imp/kWh but can be made to blink for Imp\kVArh or Imp\kVAh (see details in chapter-5 'meter constant unit'). Pulsing rate is displayed just before 'ready' display after every power up and it is different for different meter type and current range selection. It is useful for checking its own calibration.

9. Communication port: A 9-pin D port is provided for communication with PC for 200 tests data dumping or printing of last completed test on portable printer or to communicate with other meter (in meter communication mode).

PRECAUTION Field CT should not be opened from secondary side, while making connections. This may lead to dangerous high voltage or CT burst. Use Test Terminal Block (TTB) for making connections.

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3

Keyboard Operations

This section deals with the description of the keys & their function. Keyboard is similar for both types of Accuchek+ . A sound familiarity with the keys is required because the keyboard controls almost all the operations. Referring to the keyboard layout (Fig.3.1), the operation of various keys is explained here. FIG 3.1 Accuchek+ KEYBOARD

Alpha-Numeric keys: These includes 0-9, A-Z, . and −. These are used for entering serial number, consumer ID, meter constant, PT ratio, CT ratio, number of test revolutions etc. Pressing Shift key activates alphabets, decimal point, & hyphen. SHIFT

SHIFT Key

Shift key is used to activate the Options printed over the keys (e.g. Alphabets, Hyphen, Decimal Point, Abort, and Print). If the user wants to enter 'A' via key board then he/she needs to press Shift key once & then press key 'ABC/1' as shown below. ABC

+

SHIFT

⇒ A

1

Three alphabets are associated with each of the alphanumeric key. For entering first alphabet, user has to press 'SHIFT' key once, for second alphabet press 'SHIFT' key twice and for third alphabet press 'SHIFT key' thrice and then press finally the key associated with that character. e.g. if the user wants to enter 'I ' then he needs to press shift key thrice & then press key

'GHI/3'. Depending on the position of the Alphabet on the particular Key, you have to press SHIFT key that many number of time. SHIFT

SHIFT

+

GHI

SHIFT

+

+

3

⇒ I

RESULT/PRINT Key PRINT RESULT

⇒

Displays Result, e.g. percentage error/Energy recorded by Accucheck

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PRINT SHIFT

+

RESULT

⇒ Print last test data on portable printer

This key has two functions, displaying result/energy and printing last test data if used in combination with shift key. Both the functions work when Accuchek is in 'Ready' mode. At the end of test, percentage error will be displayed & if the user presses this key once, Energy logged by the Accuchek will be displayed. On pressing it again, percentage error will be displayed. User can see the percentage error and energy recorded by Accuchek of the last completed test any time by pressing this key provided it is in 'Ready' mode. ENTER Key

ENTER

This key is used for accepting a data and is similar in function, like 'Enter' key of a PC. After the user has typed some information (say Sr. no.) & then if he presses 'Enter' key, data will be accepted. Pressing Enter key at the end of test will enable the user to start another test without switching OFF the supply.

CHECK Key

CHECK

By pressing 'CHECK' key, user can see the various instantaneous parameters. This key is functioning in 'ready mode', 'data entry mode', and 'testing mode'; i.e. while test is on. All the instantaneous parameters will be updated on every second. In case of 3P3W meter selection, Y phase parameters will not be displayed. List of parameters is as follows: S. No. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11.*

Instantaneous parameter Individual phase Voltages Individual Line Voltages Individual phase Currents Individual phase Active Currents Individual phase Reactive Currents Individual phase Power Factor Individual phase Active power Individual phase Reactive power Individual phase Apparent power 3-phase active, reactive and apparent power Incremental Active, Reactive lag/Lead, Apparent energy display

Annunciation Vr, Vy, Vb Vry, Vyb, Vby Lr, Ly, Lb Ir, Iy, Ib ir, iy, ib PFr, PFy, PFb Pr, Py, Pb Qr, Qy, Qb Sr, Sy, Sb P, Q, S

Measurement Unit Volt Volt Amp Amp Amp kW kVAr kVA kW, kVAr, kVA

Wh,VArh+/-,Vah

Wh,VArh+/-,VAh

* This display is available, during test only. Incremental Reactive lag energy (with +ve sign) will be displayed if power-factor is lagging else, reactive lead energy (with -ve sign) will be displayed. For very long test, it switches automatically to kilo units and display annunciators will change to kWh, kVArh, and kVAh respectively.

Following instantaneous parameters (called as fixed displays) are always being available and not changed by 'CHECK' key. 1. Instantaneous three phase average power factor (PF) 2. Instantaneous Frequency (F) in Hz 3. Real time (T) in Hours : Minute format Display example follows is showing individual phase voltages for 3 x 63.5 Volt (3P4W in Accuchek HT+) selection and in fixed display, three-phase average power factor (PF), frequency (F) and real time (T). Last line is showing that Accuchek is in 'Ready' mode and keys allowed here are 'Enter' or 'Start'.

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DELETE

DELETE Key

Delete key is used for deleting the last entry made by the user. Suppose the meter constant of the MUT is 12800 & the user accidentally presses 9 (instead of 8) after pressing 1 & 2. Then by pressing delete key he can delete that wrong entry (i.e.9) and can again enter 8 (which is correct one). This key is allowed in all data entry operations .

START / ABORT Key ABORT START

⇒

Making Accuchek ready for the test

ABORT

SHIFT

+ SHIFT

START

⇒

Bringing Accuchek to 'ready' mode from any of the mode ABORT

SHIFT

+

+

START

⇒ For selecting different 'Meter type' Start Key is for starting the test. Before starting the test, user should make the keyboard entries (i.e. MUT Sr. Number, Consumer ID, Meter Constant & Test Revolutions etc.). However, for successive tests on the same MUT, no need to re-enter the data, new test can be started by pressing 'Start' key. This key is allowed while 'ready' or 'percentage error' or 'energy' is on the display. After every power-up user has to enter test mode then only it allows test start on pressing 'Start' key. Test will be started either on pressing of snap-switch or sensing of first pulse from Opto-sensor (depends on test mode) after pressing 'Start' key. If during the test, user wants to abort the test then first he should press the 'Shift' key & after releasing it should press the 'Start' key. This will abort the currently going test and Accuchek will come to ready state. Here, user can restart the test by pressing 'Start' key again. If 'Start/Abort' key is pressed after pressing 'Shift' key two times, then it will bring Accuchek to meter selection display. It is useful when user wants to test a different meter type without switching off the Accuchek. This option can be used after meter selection in any of the state of the Accuchek (i.e. data entry, testing, result display etc.).

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4

Connection Diagram

FIG 4.1: Accuchek LT + Checking LT CT operated meter using 1A/5A current range

FIG: 4.2 Accuchek LT+ Direct Connected meter using Clamp-On CT

R

Y

B

1 S 1L 2S

2L 3 S

N

IR

IY

ACCUCHEK IB

VR

VY

VB

N

3L MUT

R Y

TO LOAD SIDE

B N

30,415V, 50Hz ,AC SUPPLY

CLAMP ON CT

FIG:4.3 Accuchek LT + Checking LT CT Operated Meter using Clamp-On CT (Checking system accuracy including external CTs)

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FIG: 4.4 Accuchek LT + Checking single phase CT operated meter using Clamp-On CT (Checking system accuracy including external CT)

FIG: 4.5 Accuchek LT+ checking single phase direct connected meter using Clamp-On CT

FIG: 4.6 Accuchek LT+ Checking single phase LT-CT operate meter using 1A/ 5A current range

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To Load Side

FIG: 4.7 Accuchek HT + Checking 2 x 110 V (3P3W) meter using 1A/5A current range

R

Y B

N

1S 1L 2S 2L 3S 3L

R Y

B

N

1S 1L 2S 2L 3 S 3L

R Y B N To Load Side

HT Supply

FIG: 4.8 Accuchek HT + Checking 3 x 63.5 V (3P4W) meter using 1A/5A current range

NOTE: 1. It is assumed in all the connections that external CT secondary is of 1A or 5A. If it is of 1A then check that against 1A current range and if it is of 5A then check it against 5A current range of Accuchek +. 2. Symbols 1S is used for R-phase source side (current in), 1L for R-phase load side (current out), similarly 2S & 2L for Yphase current in and out, 3S & 3L for B-phase current in and out.

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5

Operating Instructio ns

You are now ready to explore the user friendly Accuchek+ .

5.1

Making connections

(a) Ensure that the mode selection switch of Accuchek + is in the "OFF" position. (b) For connection details please refer the previous chapter on connection diagram and do the connections accordingly. (c) It is advised that you should first apply voltage and then current.

5.2

Power up

(a) Accuchek HT+ : Put the Mode Selector Switch to the 2 x 110 Volt (3P3W) mode if you intend to test 3-phase 3-wire meter or to 3 x 63.5 Volt (3P4W) mode, if you intend to test 3-phase 4-wire meter. Accuchek LT + : Put the Mode Selector switch to 1-PHASE if you intend to test LT single phase (1 x 240 Volt) meter or to 3PHASE, if you intend to test 3-phase LT CT operated or direct connected meter. (b) As soon as you select the mode Accuchek + will get powered up and will show LCD test display for 3 seconds as shown below and then switches to general information display. This display is helpful for checking correct working of all the segments of LCD.

Caution: If current is applied to the Accuchek before powering up, the display of Accuchek it will behave abnormally and display will hang. To avoid such condition, User should power up Accucheck first and then current should be applied to the Accucheck. (i.e. Current Circuit sh ould be connected after that).

5.3

General Information display

In this display Accuchek type, HT/LT is displayed on first line. On second line, Accuchek+ Serial Number is displayed. On third line, current date, & time and on last line, number of test remaining is displayed. This display remains on for 5 seconds then switches automatically to next display of meter type selection. Accuchek + can store 200 test data in its memory. On successful completion of every test, number of test remaining will decrement by one. If user keeps on doing test, even after crossing the limit of 200 tests, then number of test remaining will be displayed 0 always. In this case, Accuchek + will also give warning message "OVER FLOW" on start of every test. When Accuchek is read through BCS, number of test remaining will reset to 200. Whenever user read the Accuhek it will give the error results of last 200 test results recorded always (for details see 5.9.J)

In the example below, user has completed five tests, hence it is displaying (200 - 5) = 195 number of test remaining. In case of Accuchek LT+ this screen will be as shown below:

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5.4

Meter Type Selection (Configuration)

A. Accuchek HT+ Here user has to select the meter type 2 x 110 Volt or 3 x 63.5 Volt (e.g. 3-phase 3-wire or 3-phase 4-wire). For selecting 3P3W user has to press key '0' and for 3P4W key '1' in the displayed example screen 5.4.1. Characters 0 and 1 keeps on blinking on display to remind user for selection.

Screen: 5.4.1

As soon as user selects the meter type, next display for confirmation (asking for YES/NO, screen 5.4.3) will appear, if your Accuchek have only one current range (e.g. 1A or 5A or clamp-on CT). If the Accuchek is supporting more than one current ranges then it will ask to choose current range in the next screen 5.4.2 as shown below. Characters 0, 1 & 2 will start blinking for current range selection. If the Accuchek has only two current ranges (e.g. 1A & 5A), then it will display only two options. User can select the desired option by pressing the key associated with it. Selection numbers (e.g. 0/1/2) will keep on blinking to remind user about the available selections.

Screen: 5.4.2 On selecting the current range, next screen 5.4.3 will be displayed. If the selection is correct then user can proceed further by pressing key '1' for YES or can opt for making selection again by pressing key '0' for NO. If he presses '0' for NO then Accuchek will display the first configuration screen 5.4.1 again for re-selection. In the example follows, user has selected 3P4W meter

Screen: 5.4.3 On selection of option YES, it will display message "Please wait" for few seconds in the next screen 5.4.4. During this period, Accuchek will configure itself.

Screen: 5.4.4

B. Accuchek LT + Here user has to select the current range 1A, 5A or Clamp-on CT depending on the current range options available on the Accuchek. If the Accuchek has only one current range then it will not ask for selec tion. If the Accuchek has two options, e.g. 5A and Clamp-on CT then it will ask to select one out of these two.

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Screen: 5.4.5 For selecting any of the current range, a number is associated. This selection number keeps on blinking to show user the available options for selection. In the example above number '0' for 1A, '1' for 5A and '2' for Clamp-on CT is assigned for selection. User can select the desired current range by pressing the selection number from keyboard. On selection of current range, nex t screen (screen 5.4.6) for confirmation will be displayed. User can continue with the selection by choosing 'YES' or can opt for re-selection by choosing 'NO'.

Screen: 5.4.6 On selection of option YES, it will display message "Please wait" for few sec onds in the next screen 5.4.4. During this period, Accuchek will configure itself.

5.5

Connection Check

This facility is a powerful tool which helps in setting the connections right. Here, it displays over voltage (for individual phase), over current (for individual phase) and phase sequence information. Over voltage is detected if any phase voltage is above 125% of Vb (basic voltage) for LT + Accuchek and 130% of Vb for HT+ Accuchek. Over current is detected if any current is above 120% of Ib (basic current) for both LT and HT. While displaying connection check, Accuchek will makes beep sound to attract user attention. In case user gets message for over voltage or for over current or for both, then he must switch off the Accuchek immediately and recheck the connections. Accuchek should be made ON only after ensuring that voltages and currents are within the specified limits. If -' --------' is displayed, that means there is no over voltage or no over current is there in any of the phase. In case of forward phas e sequence (e.g. RYB, YBR & BRY), message 'FOR' is displayed and in case of reverse phase sequence (e.g. RBY, YRB & BYR), message 'REV' is displayed. If any phase voltage is below 35% of Vb or testing on single phase then no sequence (e.g. ------) is displayed. This display will continue until 'Enter' key is pressed for next display. Example below is showing over voltage in R phase and over current in Y phase and phase sequence is forward.

Next screen will be displayed only when, there is any of the following condition, otherwise it switches to next display of calibration pulse rate. (a) Missing voltage: declared if any voltage is below 67% of Vb (V basic) for LT + Accuchek and 70% of Vb for HT+ Accuchek. (b) Missing Current: declared if any current is below 0.6% o f Ib (I basic). (c) Reverse Current: declared if any current is reverse. NOTE: - In case of any phase potential is missing than current reversal or missing current of that phase will not be checked, in that case last line ' I Reverse = ' will not be displayed. Y phase current missing & current reversal is not applicable for 3P3W selection in Accuchek HT+. Example below is showing missing current in B phase and reverse current in R phase.. User should correct the connections before proceeding ahead. Press 'Enter' key to switch to next display .

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5.6

Single-phase Testing

This option is applicable for Accuchek LT+ only for testing single-phase meters. Red phase voltage & Red phase current should only be used for checking accuracy of single-phase meters. Selection switch should be switched to 1-phase before start of this test. Accuchek will ask user about single-phase mode of operation as shown below, soon after second screen of connection check display. This display will not come if testing 3-phase meter.

If user enters choice '1' or presses 'Enter' key then it will continue with single-phase testing and if user enters choice '0' then it will ask for reselecting the meter type again.

5.7

Calibration Pulse Rate

This display will show the pulse rate of its own calibrati on LED in Impulses per kilo-Watt-hour unit. Referring to Accuchek HT +, 3P3W and 3P4W with 5A selection has pulse rate 40000 Imp/kWh. It is useful in checking its own accuracy against a higher precision instrument.

In case of Accuchek LT +, 1A selection has pulse rate of 80000 Imp/kWh, 5A selection has 16000 Imp/kWh and 100A clamp-on CT selection has 800 Imp/kWh. ( For other rating of Clamp-ON CT pulse rate will be different) Following example is showing 40000 Imp/kWh.

5.8

Ready mode

This mode can easily be recognized by 'Ready' displayed on last line. Here user can see any of the instantaneous parameters by pressing 'Check' key or opt for data entry by pressing 'Enter' key or can start a new test by pressing 'Start' key. On power up it will not start test on pressing 'Start' key until user enters test mode. Refer section "Getting familiar with keyboard - CHECK key" for details of all instantaneous parameters.

5.9 A

Data Entry MUT serial number

On pressing 'Enter' key in ready mode, following screen will be displayed for entering Meter Under Test (MUT) serial number.

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By default, it displays MUT serial number of the last completed test. User can enter desired MUT serial number (maximum 10 alphanumeric characters) through keyboard or can keep the same serial number by pressing 'Enter' key. User entry is display on the right hand side after → (arrow) mark and header is display on the left side of the last line of the display. Use delete key for deleting the last entries. When α-numeric key is pressed, corresponding number or alphabet will displayed on the display. Above example is displaying instantaneous individual phase active currents, three-phase average power factor, frequency, real time, and MUT serial number '0123456789'. After making entry press 'Enter' key to accept the MUT serial number entered and switching to next display of consumer ID. B

Consumer Identification Code (ID)

As the user presses 'Enter' key after entering MUT serial number, next screen for entering Consumer ID will be displayed as shown in the display example follows:

It displays last entered consumer ID, which the user can change (maximum 10 alphanumeric characters) through keyboard. In case user does not want to change entry then he/she can skip this entry by pressing 'Enter' key. Example above is showing instantaneous individual phase reactive currents, fixed displays (Power Factor, Frequency and Time) and consumer ID. C

Meter Constant

On pressing 'Enter' key, next screen for entering meter constant will be displayed. By default, the meter constant of the last meter tested will be displayed.

If the user wants to go on with the same settings, he/she needs to press 'Enter' key. The program will go on to the next screen. But if the user wants to change the meter constant then he/she needs to press numeric keys to enter the meter constant. Meter constant can be of maximum 7 digits. Once the user has finished entering the number, presses 'Enter' key will enter the data. There is a provision for entering the meter constant with decimal value also (like 533.333 for meter constant 1600/3). For entering decimal value press 'Shift' key and then '0' key. Please note that decimal point can be entered only once in an entry. User can enter meter constant for Electro-mechanical meters in revolutions/kWh or for static meters in Impulses/kWh. Test modes allowed are '0' (i.e. pulse mode) and '1' (i.e. Start-Stop mode). In pulse mode, either Opto scanner or Snap-switch can be used and in Start-stop mode, only Snap-switch can be used. For details, refer chapter "Performing a Test". In case the user wants to test a static meter without calibration pulse output then he/she needs to enter 0 for the meter constant (in this case it is assumed that such meters don't have any meter constant). In this case, the Accuchek will not ask the number of test revolutions and energy type information. Revolution is taken as one and tri-vector energy mode is assumed. Here, user can test meters in 'Start-Stop' mode (mode = 1) or 'Meter Communication' mode (mode = 2). How to enter very small meter constant? E.g. HT meter with meter constant 0.001524 Revs.\kWh and CT ratio 2000? In this case user should enter Meter constant = 0.001524 x 1000 = 1.524 and CT ratio = 2000/1000 = 2. This is done to get correct accuracy without any mathematical error. The Rule: For meters having very small meter constant, multiply it with a suitable number before entering on the Accuchek and also divide the CT ratio or the PT ratio with the same number before entering on the Accuchek.

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D

Meter Constant Energy type

This screen will not be displayed if 0 meter constant is entered. Here user has to select one option from 0/1/2/3. Each option corresponds to different energy type, which user can check by pressing key '0', '1', '2', or '3'. Entry will be accepted only on pressing 'Enter' key

The details of Energy type code are shown in the table. Option

Meter constant Energy Type

Purpose

0

Imp/kWh

Testing kWh meter

1

Imp/kVArh+

Testing kVArh meter in Lag power factor

2

Imp/kVArh-

Testing kVArh meter in Lead power factor

3

Imp/kVAh

Testing kVAh meter

One of the good features is that on selecting particular energy type, pulsing calib LED will start blinking in that unit. This feature is useful for checking its own accuracy (of active, reactive and apparent energy) against some other reference standard. E.g. if Imp/kVAh is selected then calib LED will start blinking for 4000 Imp/kVAh. On every power up it resets to default unit of Imp/kWh. E

Test Revolutions or Number of pulses

Pressing Enter key w ill take the user to the test revolution entry screen. Here user has to enter the number of disc revolutions in case of Electro-mechanical meters or the number of pulses in case of static meters for which he/she wants to test. E.g. if user has entered 100 revs then test will be completed on receiving 100 pulses or on counting 100 times red mark of rotating disc.

This will not be asked if zero meter constant is entered, (in this case it is assumed to be one). By default, the test revolutions of the last meter tested will be displayed. If the user wants to go on with the same settings, he/she needs to press 'Enter' key. The program will go on to the next screen. However, if the user wants to change the test revolutions then he/she needs to enter it through keyboard. The maximum value for REVS is 65534. If user enters more than this or zero then Accuchek will prompt "Enter again" and user can enter correct value. F

PT ratio

This option is available in Accuchek HT+ only. By pressing enter key will display the PT ratio of the last meter tested. If the user wants to change it then press numeric keys to make suitable entries. The process is similar to the one used for entering meter constant of the MUT. PT ratio can have a value as high as 99999. Press Enter key when you have finished making entries. The PT ratio also supports decimal point entry.

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In this example the meter is commissioned at 11 kV and Accuchek is commissioned at 110V. So the PT ratio = 11 kV/110 V = 11000 V/110 V = 100, the display will look like as shown above. G

CT ratio

Process is similar to one use for PT ratio entering. If user does not want to change the displayed entry then he/she can switch over to next entry by pressing 'Enter' key.

Example above is showing CT ratio for the (MUT) meter of 100A/5A CT = 20 CT ratio. Other information is instantaneous threephase active power (P), three-phase reactive power (Q, +ve sign means importing kVAr and -ve sign means exporting kVAr) and three-phase apparent power (S). Fixed displays instantaneous average power factor, frequency and real time is also displayed in fixed display area. Note: In case a big number is entered for Meter constant or PT ratio or CT ratio and entry is rechecked, then you will find a little change after 2nd decimal place. I t happens; because of floating point number system is used for storing real numbers. It will not affect error computation or the performance of the Accuchek.

H

Test Mode

It is the information supplied by user for performing test in a particular fashion for a particular type of meter. Entering 'mode' is must on every power -up to enable Accuchek to start a test. On the next page, the list of all possible combinations of test mode and their use is given. User can check the meaning of each of the test mode code i.e 0/1/2 by pressing respective keys, on display. E.g. on pressing '0' key it will display "Pulse mode", means code zero is for testing meter in pulse mode. Similarly 1 is for start-stop and 2 is for meter communication mode. Mode is not selected until user presses 'Enter' key after choosing the desired choice. Following screen will be displayed if non-zero meter constant is entered:

Above example is showing that user can test meter in either mode 0 (i.e. pulse mode) or in mode 1 (start-stop mode). If user presses '0' then following screen will be displayed:

Now pulse mode will be selected only on pressing 'Enter' key and display changes to ready state as shown in the example display screen.

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Now the data entry is over and Accuchek is ready for starting the test. User must connect either Opto-scanner or snap-switch in the same slot, before pressing 'Start' key. Which (Opto-scanner or Snap-switch) is to be connected, choice depends on mode entered.

Meter consta nt entered Nonzero (e.g. 40000 Imp/kW h)

Zero (0)

Test mode displaye d 0 Pulse mode

Purpose

Operating procedure

Remark

For testing Electromechanica l or static meters with calib pulse.

Opto scanner or Snap switch can be used. If snap switch is used then needs to be pressed on every MUT pulse or the disc revolution (judged on red mark crossing).

1 StartStop mode

- do -

Snap switch can only be used. User needs to press it once at start then count pulses or revolutions verbally and press it 2 nd time when entered pulses are over.

1 StartStop

For testing a) Static meters without pulse output b) Regis ter increments in Electro mechanica l type of meters

User should note down the initial reading of MUT (preferably in current off condition) then start the test by pressing Snap-switch. Note down final MUT reading and then press Snap-switch again to end the test. Now enter the differential MUT energy = (final-initial) in the Accuchek. It will give error directly.

2 Meter Commun ication

For testing SML meters (E201 onwards)

User should connect 9-pin end of the meter comms. Cord on Accuchek and optical end (PACT port) of the cable to the meter. It will detect meter and displays message either "Meter found" of "Meter not found". Rest of the operation is similar to the mode 1 above. Here, Accuchek will read start & end energy of the meter automatically, and not required to enter.

It is better to use Opto Scanner in this mode as user can miss Snap switch pressing on some of the pulses/revs, that results in incorrect results. It is useful when the pulses or revolutions are coming at slow rate and can be counted by eyes. Option explained above can also be used in place of this. It is useful for testing static meters (without pulse output) from displayed energy and for checking, register increments in Electromechanical/st atic meters (longer duration) test. Can be used with SML supplied E201 onwards meter only (Check compatibility of meters for this test with SML).

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I

Entry Recheck

Suppose the user wants to verify the entries made by him/her and wants to correct them in case a wrong entry being made. For this when the ready is displayed press Enter key. By pressing Enter key the user can scroll through the entries made. Suitable headers described above will be displayed with each entry. Incase the user wants to amend a particular entry then the user has to leave the display at particular entry & then make the whole entry again. For instance, the user has entered test revolutions as 10 instead of 100. When the test revolutions are displayed on entry recheck, user should start making fresh entries i.e. 1 then 0 then 0 & then Enter. Now the Accuchek will accept 100 revolutions. J

Roll Over mode

In roll over mode “Overflow” message appears when the Accuchek's 200-test data area (on completion of 200 tests) is filled completely and user starts a new test. This message helps in reminding user that the new test data will over -write the oldest test. In this situation general display after LCD test display will continue to show, number of test remaining = 0. The overflow display looks as follows:

To start a test user has to press 'Start' key again. Then the display changes to:

In above example snap-switch is connected hence message "Press Snap" is appeared, if Opto-scanner is there then "Scanner" will be displayed. Test will be started on pressing snap-switch (if snap-switch is connected) or on first pulse sensed by scanner (if Opto-scanner) is connected. Whenever Accuchek is read successfully using BCS, it will reset the number of test remaining to 200 . If power fails during read or communication breaks in between because of any reason then the test records will not reset and user can safely read the data again. Note:- The Accuchek has capacity to store 200 test data in its memory. These 200 test results always remain in its memory and may be uploaded with help of BCS software running on PC. Initially, display shows “Test Remaining: 200” message indicating that you can store 200 test results into the memory. If you perform a new test now, it is stored into the memory and “Test Remaining: 199” message is shown. Similarly, you can perform more test operations now. Each subsequent test operation decreases value of “N” by one where “N” is number of remaining tests. When you have performed 200 tests, the display shows “Overflow” message and a new test is saved in memory by replacing an old test results in FIFO (First In – First Out) manner. Whenever, you perform a data upload operation, all test results available in the Accuchek memory are uploaded to BCS. However, the status being shown on display changes as follows: Uploading operation before completion of 200Nos. test results ü If the “Upload” operation is performed when display is showing “Test Remaining: N” message, the display status is not updated it still shows the same message- “Test Remaining: N”. Each subsequent test operation decreases value of “N” by one where N is number of remaining test results. However 200 test results available in Accuchek memory are uploaded to BCS (Always 200 test results only after “Over Flow” message is shown first time).

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Uploading operation after completion of 200Nos. test results or on “Overflow” message ü If the “Upload” operation is performed when display is showing “Over Flow” message, “Over Flow” statuson display is cleared and now display shows - “Test Remaining: 200” message again. Each subsequent test operation decreases value of remaining tests by one. In this case too, all 200 test results available in Accuc hek memory are uploaded to BCS.

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6

Calculation of CT and PT ratio

There can be two possibilities when checking HT MUT with Accuchek HT+: (i)

Meter (MUT) is secondary commissioned, means measuring energy for 110 Volt and 5 Amp and no factor (PT ratio & CT ratio) is applied on its reading as such. Electro-mechanical meters and secondary commissioned static meters will fall under this category. Here user has to enter CT ratio = 1.0 and PT ratio = 1.0 on the Accuchek HT+ as both MUT and Accuchek is measuring in same secondary units, i.e. 110 Volt and 5 Amps.

(ii)

MUT is primary commissioned for the installed CT-PT ratios, means it is giving its readings in primary units after incorporating CT & PT ratios. E.g. installed CT is of 200/5 A and installed PT is of 66 kV/110 V and MUT energy recording is for 66kV, 200A. Most of the static meters are commissioned for installed CT & PT ratios and gives reading directly in primary values. In this case, user has to calculate CT & PT ratio as follows: Primary Current

CT ratio = -------------------------------------

Secondary Current

= 200/5 = 40 Primary Voltage

PT ratio = -------------------------------------

Secondary Voltage

= 66 kV/110 V = 66000 V/110 V = 600 Here, user needs to enter CT ratio = 40 and PT ratio = 600 on the Accuchek HT+. Accuchek HT + will divide energy of the MUT by CT ratio and PT ratio before comparing with its own energy for computation of error. Accuchek HT + is measuring in secondary values, i.e. 110 V & 5A/1A. Rule 1: Accuchek HT+ will divide MUT energy (entered or calculated by itself) by CT ratio and PT ratio before calculating percentage error. It is done to bring MUT energy to its own scale. This rule is applicable whether Accuchek HT + is used with 1 Amp or 5 Amp current range. There can be five possibilities when checking LT MUT with Accuchek LT+:

(i)

As shown in the figure 6.1, MUT is recording energy for 415 Volt, 5A (secondary commissioned, CT ratio is not incorporated in its readings). Accuchek LT+ is connected on line using 100 A clamp-on CTs. Here user is checking combined accuracy of meter (MUT) and external CTs (100/5 A) means complete system. CT ratio needs to be entered on Accuchek LT + is 100/5=20. External CT 100/5 A

Accuchek Clamp-on CT 100 A

3-phase, 415 Volt 100 A line

MUT

ACCUCHEK LT+

Fig: 6.1 Single line diagram of Accuchek LT+ Rule 2: Accuchek LT+, when used with Clamp-on CTs, it will multiply MUT en ergy by the CT ratio entered and then compare with its own energy to calculate percentage error of MUT.

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In the above example if MUT is recording energy for 415 Volt, 100 A (primary commissioned, CT ratio incorporated in its energy readings). In such a situation user has to enter CT ratio 1 in the Accuchek LT+. Accuchek will multiply MUT energy by CT ratio (unity) and then compare with its own energy to find out percentage error of MUT.

(ii)

As shown below in single line diagram, MUT and Accuchek LT+ (using 1A \5A current range) are connected in series on secondary side of CT. MUT is recording energy for 415 Volt, 5A (secondary commissioned, CT ratio is not incorporated in its energy readings). User has to enter CT ratio 1, as both MUT and Accuchek LT + are measuring energy on the same scale (e.g 415V, 5A). External CT 100/5 A

3-phase, 415\ 110 Volt100 A line 5 A connection

MUT

(iii)

ACCUCHEK +

In the above example if MUT is primary commissioned (CT ratio is incorporated in its energy recordings) means it is recording energy for 415 Volt, 100A. In such a situation user has to enter CT ratio 100/5=20 in the Accuchek LT +. It will divide MUT energy (entered or calculated by itself) by CT ratio = 20 and then compare with its own energy to find out percentage error of MUT.

Rule 3: Whenever, Accuchek LT+ is used with 1 Amp or 5 Amp current range then it will divide MUT energy by CT ratio to bring MUT energy to its scale to calculate percentage error of MUT.

(iv)

When, Accuchek LT+ is checking accuracy of whole current \ direct connected meters with clamp-on CTs, unity (1.0) CT ratio should be entered.

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7

Performing a Test 1. Make the connections as mentioned in the previous section. Also, check thoroughly to ensure proper connections. 2. Ensure that the current is applied before starting the test. 3. Power up the Accuchek. It will follow the display routine as described earlier. If connections are faulty, proper error message will be displayed. Switch OFF the Accuchek & correct the connections. Again, switch it ON. 4. After usual display cycle, READY will be displayed. 5. Make suitable entries using keyboard as described in previous section. Select proper mode and connect Opto-scanner or snap-switch in the 4-pin slot provided (depends on the mode you have selected). In case of static meters without pulse output, make sure that Meter constant is entered as zero. 6. Press START key when all the entries have been made & READY is displayed.

A

Testing of Electro -Mechanical / Static Meter with pulse output using optical scanner- Pulse counter mode (Mode entered as 0)

Figure Opto-Sensor Unit Mounting

1. Position the switch of the sensor in appropriate position for disc/ static meter testing. 2. In case of disc meter testing, ensure, through proper adjustments, that the two green LED's focus their light on the disc. In case of static meter testing, ensure that the pulse output LED on MUT is directly under the Lens on the sensor. 3. At this stage the red indicator LED on the front face of the Opto sensor may or may not be lighted up depending on the position of the sensitivity control knob. Try rotating the sensitivity control knob. It will be observed that the LED turns off at a particular position of the knob as the knob is rotated clockwise and lights up again as the knob is rotated anti clockwise. Adjust the knob such that the position is just beyond the point where the LED turns off. You will observe that, as the mark on the disc crosses, the red LED lights up. If this does not happen or the LED shows flicker, try readjusting the knob until you get a clean single pulse on the crossing of the mark. You may have to readjust the distance of the sensor from the MUT for proper focusing and response. 4. Ensure that the sensor is giving satisfactory response for at least 15-20 mark crossings/ pulse outputs and then start the test by pressing 'Start' key. Following screen will be displayed:

5. After START is displayed, Accuchek detects the first pulse from the meter through Opto-scanner and displays the pulse count on the last line. In the example below first three lines are showing incremental energy displays for active, reactive lag and apparent energy respectively and last line is showing the 'Pulse count'.

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6.

On getting, subsequent pulses from opt-scanner 'Pulse count' keeps on decrements from 100 to 99, 98, 97, … the n finally to 0.

7.

Test completes automatically when all the pulses have received for the fed revolutions (i.e. if you have fed revolutions as 100 then after receiving 100 number of pulses, the test completes) and % Error of MUT active energy import will be displayed as shown below:

Following heading for active energy and % error will be displayed: (a) Wh - I ⇒ MUT Active energy (fundamental) in Import mode. (b) Wh - E⇒ MUT Active energy (fundamental) in Export mode. (c) Wh - IT⇒ MUT Active energy (Total) in Import mode (d) Wh - ET⇒ MUT Active energy (Total) in Export mode 8.

You can see the energy logged by the Accuchek by pressing RESULT key. Its display example is shown below.

Percentage error is computed using following formulae: MUT Energy - Accuchek Energy

% Error =------------------------------------------- * 100 Accuchek Energy

9.

Pressing 'Start' key, while percentage error or energies are on the display can start a new test. For going to READY mode press 'Enter' key.

B

Testing of Electro-Mechanical / Static Meter with Snap-switch in 'Pulse' count mode (Mode entered as 0)

1. This test can be performed only when non-zero meter constant is entered. Connect snap switch and then press 'Start' key. Display will show header 'START' on the last line. Press the snap-switch as soon as red mark on disc crosses or pulse comes from MUT.

2. Repeat above process for every red mark cross over / pulse comes from MUT. On receiving first pulse from snap-switch, the display changes as follows and test will start. Last line is showing the pulse count remaining for completion of test.

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Press Snap-switch on subsequent crossing of red mark. The 'Pulse count' on display changes to 19 then 18, 17, 16…up to 0. 4. Test finishes automatically when you have pressed snap-switch for the fe d revolution number of times (i.e. if you have fed revolutions as 20 then after pressing snap-switch 20 number of times, the test completes) and % Error will be displayed. 5. You can see the energy logged by the Accuchek by pressing RESULT key. 6. Pressing 'Star t' key can start a new test. For going to READY mode press 'Enter' key. 3.

C

Testing of Electro -Mechanical Meter with Snap-switch in Start/Stop mode (Mode entered as 1)

1. 2. 3. 4.

After START is displayed, wait for the crossing of red mark. As soon as the red mark crosses, press the snap-switch. It will display 'Pulse count = 00001'. Count the subsequent crossing of the red mark, verbally (no need to press snap-switch on every red mark cross over). When the desired number of revolutions of the disc completes, press the snap-switch button again just as the red/black mark crosses the reference mark to stop the Accuchek recording. Test will finish & the Accuchek will display the % Error. 5. You can see the energy logged by the Accuchek by pressing RESULT key. D

Testing of Static Meter without Pulse O/P.

The Accuchek will consider a meter as a Static meter without pulse output when the meter constant is entered as 0. In this case, it will assume the revolutions as 1 & the mode of snap-switch operation as Start/Stop mode and here it will not ask for the revolutions as well as energy type. It is also useful to find out the correctness of register/counter increments in all type of meters. In some of the meters, disc rotation/pulses given by meter is correct but corresponding increments in register/counter is incorrect. This test is helpful in finding out such fault. 1. Make sure that snap-switch is connected. Complete all entries on Accuchek and press 'Start' key, it will display START. 2. Note down the initial kWh reading of the MUT and then press Snap-switch to start the test. The Accuchek will display Pulse count = 00001

3. When you want to end the test, note down the final MUT readings and then press Snap-switch. Accuchek will prompt for enter unit of difference MUT energy. Code '0' is for Wh and '1' is for kWh. User can also see the meaning of code 0 or 1 on display by pressing respective key. Option will be selected only on pressing 'Enter' key. By default it selects unit Wh, hence if user wants to enter in Wh units then he/she can go to next display by pressing 'Enter' key and by default Wh units will get selected. NOTE: User is recommended to choose the units in kWh only when the consumed difference energy is more than 1 kWh for better accuracy results.

4. Calculate the difference of MUT energy during the test. This can be calculated by subtracting initial MUT reading from final MUT reading. Then enter it into the Accuchek in the units entered just before.

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In case you want to enter 0 active energy then you can skip this by pressing 'Enter' and by default 0 will be taken by Accuchek.

5. On pressing the ENTER key, units for reactive+ (lag) will be asked then reactive lag energy, units of reactive- (lead) and

reactive lead energy and finally unit of apparent energy then apparent energy. Entering process is similar to one explained above. On entering apparent energy and pressing 'Enter' key, it will display percentage error .

6. User can see energy recorded by Accuchek by pressing 'RESULT' key . E Testing of Static Meter in meter communication mode This mode is useful for checking accuracy of static meters manufactured by us. Please check the compatibility of meters for this test, as meters with processor E201 or higher is only supporting this feature. Connect the nine pin male end of meter communication cord to Accuchek's nine pin female communication port and the other end of cord to the meter PACT port (optical port). Enter meter constant zero. Select test mode as 'Meter Comms' by pressing '2' in the mode selection option '1/2' as shown in the example screen 7.5.1

Screen: 7.5.1 On pressing 'Enter', key after selecting mode Accuchek will display message at the bottom line either ' Meter found' (screen 7.5.3) or 'Meter not found' (screen 7.5.2) depending on the connection and suitability of the meter. In case, it is showing message 'Meter not found' (screen 7.5.2) then user should check the communication cord connection between Accuchek and the MUT and connect the PACT port end properly. This message can also displayed if meter is not compatible. Accuchek + , will keep on retrying to establish communication with MUT until message 'Meter not found' is on the display .

Screen: 7.5.2

Screen: 7.5.3 Pressing 'Enter' while, message 'Meter not found' is on the display will select start-stop mode (mode=1). However, 'Enter' is pressed, while message, 'Meter found' is on the display will select meter communication mode (mode=2). On pressing 'Start', Accuchek will display message on the bottom line 'START → Press Snap'. Pressing snap-switch will start the test. For ending test press, snap-switch again. Accuchek will display percentage error, and energy logged during the test can be seen by pressing 'Result' key.

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NOTE (1) Maximum possible value of error is 100%, even if computed error is more than 100%, it is displayed as 100%. Examples above showing +0.01% error in active energy, -0.09% in reactive lag energy, 0.0% in reactive lead energy and +0.02% in apparent energy. (2) To print the results on printer, press SHIFT key and then press RESULT key, while the READY is on the display. Keys should be pressed one after another and not simultaneously. (3) A beep sound will be produced after 1 minute in all modes except meter communication mode, in which 4 minute after the test start. It will remind the user about the minimum test duration. If user finishes test before this time then the results are not so accurate and repeatable. (4) It is recommended to test 1A range MUT on 1A range of Accuchek, 5A MUT on 5A range of Accuchek and MUT of above 5A range with clamp-on CT of Accuchek to get full metrological advantage. (5) On power up it will not allow a new test to start by pressing 'Start' key until test mode is entered.

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8

Reading Data

Accuchek is having memory provision. It can store test data of maximum of 200 meters without data getting lost or over written. To read the Accuchek by means of suitable B ase C omputer Software (BCS ) named Accuchek.EXE follow the following steps. 1. Power On the Accuchek and bring it to 'Ready' mode. Make sure that communication cord is connected between Accuchek and Computer (The communication cord with 9 Pin D-type connector on the both sides is to be used for this purpose). 2. Run the BCS on computer. 3. Make sure Accuchek is in ready mode, i.e. when READY is displayed on the Accuchek, start reading Accuchek (Please refers to the instruction manual for BCS). 4. On successful reading through BCS, number of test remaining will resets to 200. That means Accuchek is ready again for storing 200 new test data. U ser can also dump data before completion of 200 tests to BCS. For details see section 5.9.J. Whenever, you perform a data upload operation, all test results available in the Accuchek memory are uploaded to BCS. However, the status being shown on display c hanges as follows: Uploading operation before completion of 200Nos. test results ü If the “Upload” operation is performed when display is showing “Test Remaining: N” message, the display status is not updated it still shows the same message- “Test Remaining: N”. Each subsequent test operation decreases value of “N” by one where N is number of remaining test results. However 200 test results available in Accuchek memory are uploaded to BCS (Always 200 test results only after “Over Flow” message is shown first time). Uploading operation after completion of 200Nos. test results or on “Overflow” message ü If the “Upload” operation is performed when display is showing “Over Flow” message, “Over Flow” statuson display is cleared and now display shows - “Test Remaining: 200” message again. Each subsequent test operation decreases value of remaining tests by one. In this case too, all 200 test results available in Accuc hek memory are uploaded to BCS. 5. Following information is available on BCS for each set of test: a) b) c) d) e) f) g) h) i) j) k) l) m) n) o) p)

File name and file security status Test number and its date & time Accuchek Serial Number Accuchek range selected (e.g. 3P3W, Clamp-on CT 5A) MUT Serial Number Consumer ID Meter constant and Energy type Test revolutions CT ratio PT ratio Test mode Test duration Percentage Error in Active, Reactive lag, Reactive lead and Apparent energy Active, reactive_lag, reactive_lead and apparent energy (Tri-vector energy) of Accuchek and MUT for the test duration. Average electrical parameters for the test duration, like percentage load, three phase active load, reactive_lag load, reactive_lead load, apparent load, and average power factor. Instantaneous parameters while test ended like, Individual phase voltages, Line currents, and reactive currents.

6. For details of Accuchek BCS refer its manual . 31 of 39

9

Dosage Testing

This test is useful for checking register increments in Meter Under Test (MUT). Amount of energy for which he/she wants to test MUT, should be fed to Accuchek. A port named 'dosage port' is provided which have potential free contacts. An external setup can be made by connecting 'contactor' through dosage port and current circuit through 'contactor' which is going to MUT and Accuchek. When Accuchek records the fed amount of energy after test start, it will disconnect the current circuit by opening dosage port. User can check increments in MUT register, and can compare with the energy fed to Accuchek. User can start this test by pressing 'SHIFT' and then 'DELETE' key. Accuchek will ask user to choose the vector for which he \she wants to perform the test by pressing choice 0/1/2/3. Choice is not selected until the 'ENTER' key is pressed. Zero is for active, 1 is for reactive_lag, 2 is for reactive_lead and 3 is for apparent energy dosage test.

Note down the initial reading of MUT. On the selection of energy type Accuchek, calib LED also starts blinking for that selected unit. Example below showing selection of active energy by pressing '0' key.

Now amount of energy is to be entered through keyboard for, which test is desired. In the example below user has entered 465.56 Wh energy for dosage test.

Test will start on pressing the snap-switch. Accuchek will close dosage port on getting pulse from snap-switch. Now display will show you decrementing energy on the 3rd line and the fed dosage energy on the 4th line as shown in the next display example. On the 3rd line Wh=237.21 is the energy remaining to register at this instant to complete the test and bottom line is showing the amount of dosage energy 465.56 Wh.

As soon as the dosage energy recorded by Accuchek, it will open the dosage port and user can check the increments in MUT energy by subtracting initial reading from final reading. Current will be switched on simultaneously in Accuchek and MUT on closing of dosage port (on pressing of snap-switch) and switched-off automatically by Accuchek when the fed dosage energy is registered by Accuchek. Following heading for active energy can be displayed as Wh = Accuchek active energy (decrementing) is fundamental type. Wh – T = Accuchek active energy (decrementing) is Total type.

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10

Printing Data

Connect the 9-pin male of printer cord to Accuchek + D-port and 25-pin male to printer and switch on the printer power supply. When the READY is on display of the Accuchek (it is in ready mode), press SHIFT and then PRINT/RESULT key (one after other), it will print the last completed test result as shown below: ---------------------------------------------------------DATE=25/01/1999 16:02 Accuchek NO. = AX000786 TEST NO. = 001 TEST DURATION = 00:03:23 ---------------------------------------------------------METER SR. NO = NIE0053689 CONSUMER ID = NIE METER CONST = 0000.000 CT RATIO = 00001.0000 TEST REV = 00001 --------------------------------------------------------Vr= 235.44V Ir= 000.93A Vy= 234.76V Iy= 003.06A Vb= 235.47V Ib= 003.41A POWER FACTOR = +0.48 --------------------------------------------------------ERROR Wh - I = −000.02 % ERROR VArh+ = −000.10 % ERROR VArh− = +000.00 % ERROR VAh = −000.10 % ---------------------------------------------------------Accuchek ENERGY Wh - I = 000047.5904 VArh+ = 000087.5792 VArh- = 000000.0000 Vah = 000099.6752 ----------------------------------------------------------SIGNATURE:______________ ---------------------------------------------------------Above example is of test conducted on LT CT operated meter using Accuchek LT+. Accuchek HT+ gives similar printout with PT RATIO information just after CT Ratio. Following heading for active energy (recorded by Accuchek as well as % error of active energy) can be displayed: (a) Wh - I ⇒ MUT Active energy (fundamental) in Import mode. (b) Wh - E ⇒ MUT Active energy (fundamental) in Export mode. (c) Wh - IT⇒ MUT Active energy (Total) in Import mode (d) Wh - ET⇒ MUT Active energy (Total) in Export mode

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Important Precautions

The following points must be given special attention: 1. Operate the Accuchek+ within its recommended voltage and current limits. Applying excessively high voltages or currents may damage the equipment. 2. If you have connected current on 5A socket and selected 1A range through keyboard then it will display wrong values of electrical parameters. Do the selection again through keyboard and then start a new test. 3. Ensure that all the potentials and all the currents are applied before you start the test. 4. During the test, do not change the power factor from lag to lead. 5. The Accuchek + is protected against internal faults by 200mA fuses. If all the connections have been made correctly, and the Accuchek + still indicates problems in the voltage circuits, it is likely that a fuse has blown. Replace the fuse. Four spare fuses are provided with the Accuchek +. Fuses of 200-mA rating, slow blow 20-mm glass type should be used. 6. There are no user serviceable parts inside the Accuchek +. Do not open and attempt to repair the instrument. 7. The minimum current threshold for the Accuchek is kept 0.6 % of Ibasic. Thus, if the Accuchek + is operated at the current level below this then it will display missing current in connection check display. 8. The maximum number of tests a user can do without downloading the data into BCS is 200. After 200 tests are done without, downloading an overflow message will be given with a buzzer sound indicating the user to download the data. 9. While entering the CT Ratio, please take care of the fact that CT Ratio is the transformation ratio looking from the primary side of the CT to the secondary of the meter i.e. if the CT is of 100/5 A, then CT Ratio = 20 should be entered. 10. The Test duration must be at least for 5 MINUTES for better metrological performance. 11. The Dosage mode relay contact rating is 240V AC, 5VA always use a interposing relay of coil rating 240 V AC & coil power less then 5 VA while using dosage mode. Such relays are available from OMRON, OEN, PLA make and are locally available in electronics hardware store. Driving directly high current contacts capacity contactors can damage the internal Dosage relay. Maintenance

Please ensure that the mating surfaces of the jaw of the clamp on ct are free of dirt or foreign matter. In case they are rusted, gently clean with sewing m/c oil or CRC 2-26, to prevent it from corrosion. Care and precaution in handling of clamp on CTs The clamp on CTs that provided with your Accuchek is a very important sensing element of the product. It needs suitable care and precaution in handling, in order to maintain its precision and accuracy. Good handling can ensure continued satisfactory operation of your equipment. The Current Transformer operates by principle of magnetic induction. The current in the primary conductor produces an Ampere-Turn, which is balanced by an equal and opposite Ampere-tur n in the secondary. The secondary current is however not exactly proportional to the primary current due to imperfections in the CT (called as ratio and phase errors). The Accuchek has the intelligence to compensate for these inaccuracies to a great extent. But uncertain errors introduced by varying air gaps in the CT, may exhibit as errors. It is therefore, very important to ensure that the air gap in the CT remains as far as possible constant from usage to the next. Following good practices can help you ensure accurate, precise and reproducible performance of the Accuchek over long periods: -

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1. Always keep the jaws of the CT clean. Dust particles can create havoc with the phase error of CTs. It is recommended that the CT be kept away from dust and packed suitably in the case provided after use. In no case should the CT be left in dusty environment for long periods.

2. Ensure that the jaws of the CTs are not rusted. It is recommended to use ordinary pencil erasers for rubbing off minor signs of rust that might appear on the CT jaw faces. However, care must be taken to carefully brush off any remnants of the eraser rubbings from the jaws before use. Do not use water, alcohol, or any other solvents to clean the jaw surface.

3. It is highly recommended to operate the jaws several times before actually starting the tests. This helps in making the swiveling action of the jaws free and reduces variation of air gap from one operation to the other.

4. The air gap in the CTs may be disturbed by unreasonable shocks. Precaution must be taken to prevent any shocks to the CTs.

5. The clamp on CT should be used in the hanging position from the wire

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Appendix A: Printer Details

Specifications Model Print method Print font Interface Paper width Number of columns Printing speed Printer Life Time Power requirement Dimension in mm

: WD400 : Line Thermal : Internal 8 x 24, External 16 x 24 : RS232C : 57 mm : 384 dots/line : 50 mm / sec : 50 Km. : 9 volt (D.C.), 2.5 A : 178(w) x 105 (d) x 82 (h)

Precautions 1. The printer is to be used free-standing and should be placed on a stable surface providing easy access to the control panel and to the paper well when lid is open 2. Do not site the printer in an exces sively hot or humid location. Exposure to grease, dust, metal scrap or liquids is best avoided. 3. When using the power adopter avoid using a main outlet, which also supplies heavy switching machinery since a noisy supply may impair printer operation. 4. Ensure that the adopter provides the correct operating voltage (when using external adopter) 5. Do not remove paper by pulling it from the back of the mechanism and do not pull excessive lengths through the top of the mechanism. Either of these operations may cause paper to tear and jam the mechanism.

Default Settings Data bits : 8 Parity Baud rate Character Handshaking Font mode

: None : 4800 BPS : USA : DTR : Normal (text)

Self-Test To perform a self- test, press the POWER ON and FEED switch simultaneously and keep depressed until the test starts. This will check all the mechanism and a large proportion of software issue will be printed.

Operating Instructions 1. Lights when the power to printer is ON. In auto power off mode, if no switches are pressed or no data from host for 5-min. power is automatically turned OFF. 2. Flashes when paper is out. Lift mechanism lever up and insert the top end of the paper into back of the mechanism, then paper will be inserted automatically. 3. Press feed button. If paper is out or lever is down status, do not perform paper feeding.

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Appendix B: Opto Scanner Details

Introduction: The Accuchek+ Scanner is general purpose sensing device for Disk rotation in Ferraris Wheel Meters & Calibrating LED pulses in static meters. It has two modes of operation viz. reflective mode and light emitting mode. Operating the miniature toggle switch can change the mode of operation. The sensitivity of the scanner can be adjusted to an optimum value by rotating the potentiometer knob on the front of the scanner. • Reflective Mode: In this mode the scanner detects the calibration mark on the rotating disk Ferraris meter. It uses a modulated high intensity visible green convergent beam to detect the calibration mark by reflection. When properly focused on the disk, it can detect the calibration marks accurately, even in the presence of fluorescent & other ambient light conditions. • Light Emitting Mode: This mode is used with electronic meters with calibrating LED outputs. The light from LED is focused on the wide band photodiode, for detection. The maximum frequency of the output can be as high as 200Hz, unmodulated.

13.1 Optical Specifications: 13.2 Reflective Mode: • • • A

Focal distance for optimum sensing : 25 – 50 mm Dominant frequency of Green LED: 570 nm. Maximum disk rotation rate: 1cycle / second

Light emitting mode: • Maximum sense frequency 200 Hz unmodulated. • Scanning LED wavelength: 450 – 850 nm.

13.3 Input and output: • Input 12 V DC ± 10% • Typical current consumption: 60mA (reflective mode), 20mA (Light emitting mode) • Output 12 V DC ± 10% pulse.

13.4 Physical Characteristics: • •

•

Dimensions: Approx. 100 mm x 60 mm x 30 mm profiled. Cable length 2 meters. Electrical connection Circular 4 pin female connector .

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Appendix C: Technical Specifications

14.1 Accuchek HT+ With 1A & 5A Current Range (A507GXX.H20) Electrical Parameters Voltage 3 phase 3 wire/3 phase 4 wire 110 Volt (3P3W) and 110/ √3 Volt (3P4W) Basic Current 1 Amp and 5 Amp. Voltage connection Insulated wire leads. Current connection Insulated wire leads Accuracy (kWh) Cl 0.2S Metrological standard IEC-687 Connections Check Missing volts. Missing current. Reverse current. Phase sequence Display Resolution (1A/5A) Voltage 0.01/0.01 Volt. Current 0.0001/0.001 Amp. Frequency 0.1Hz Individual Power factor 0.001 for all ranges Average 3-phase power factor 0.01 for all ranges Total Instantaneous Load 0.0001/0.001 kW/kVAr/KVA Energy Wh/VArh/VAh 0.0001 for all ranges

Voltage Max.Current Power factor Frequency Temperature Humidity (maximum)

Operating Conditions 110 V ± 30 % for 3P3W and 110/ √3 ± 30 % for 3P4W selection 120 % of Ib. 0 lag - UPF - 0 lead. 50 Hz ± 5%. -10°C to +50°C. 95% RH non-condensing.

Voltage circuit Current circuit

Burdens Within the limits of IEC687 Within the limits of IEC687

Voltage Frequency Temperature Magnetic fields

Influence Quantities Within the limits of IEC687 Within the limits of IEC687 Within the limits of IEC687 Within the limits of IEC687

Length Width Height Weight

Dimensions 465 mm. 350 mm. 160 mm. 8.0 kgs.

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14.2

Accuchek LT+ With 1A, 5A Current Range and Clamp-On CT

(A501GXX.H20) Voltage 3 phase /1 phase Basic Current Voltage connection Current connection Accuracy (kWh) Metrological standard Connections Check

Electrical Parameters 3 x 240 Volt / 1 x 240 Volt 1 Amp, 5 Amp and Clamp on CT Insulated wire leads. Insulated wire leads for 1A & 5A and Clamp-on CTs Cl 0.2S for 1A & 5A and Cl 0.5S for clamp-on CT IEC-687 Missing volts. Missing current. Reverse current. Phase sequence

Display Resolution (1 A/ 5 A/ Clamp on CT ) Voltage Current Frequency Individual Power factor Average 3-phase power factor Total Instantaneous Load kW/kVAr/Kva Energy Wh/VArh/VAh

Voltage Max.current Power factor Frequency Temperature Humidity (maximum)

Voltage circuit Current circuit

0.01/0.01/0.01 Volt. 0.0001/0.001/0.1 Amp. 0.1Hz 0.001 for all ranges 0.01 for all ranges 0.0001/0.001/0.1 0.0001 for all ranges

Operating Conditions 240 ± 30 % Volt 120 % of Ib. 0 lag - UPF - 0 lead. 50 Hz ± 5% -10°C to +50°C. 95% RH non-condensing.

Burdens (1 A, 5A ) Within the limits of IEC687 Within the limits of IEC687

Influence Quantities (1 A, 5A/ Clamp on CT ) Voltage Frequency Temperature Magnetic fields

Within the limits of IEC687 Within the limits of IEC687 Within the limits of IEC687 Within the limits of IEC687 Dimensions

Length Width Height Weight

465 mm. 350 mm. 160 mm. 9.5 kgs.

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