Fanuc Axis Jumper Plugs

AXIS JUMPER PLUGS FOR CNC AND SERVO DRIVE BC950801 DUMMYPLG.DOC ______________________________________________________________________________

INTRODUCTION Axis jumper plugs are often used by GE Fanuc Field Service personnel to jumper out certain signals to the Axis Command, Axis Feedback, and Servo Drive connectors. They have proven useful during the initial powerup of a system and also when troubleshooting. Axis jumper plugs consist of Honda MR or PCR series 20-pin connectors that contain jumper wires (and pull-up resistors in one case) to loop back the required signals. The MR series are used with 0/10/11/12/15 controls with A quad B or serial feedback (0/15 only) and also with analog and digital drives. The PCR series are used with newer controls (16/18/Power Mate D/etc.) and drives (C-series, Alpha). Refer to the following figures for detailed connections. DESCRIPTIONS 1. CNC Axis Command Plug (for Digital Servo systems) This plug connects to the CNC where the command cable normally goes. It loops back the *MCON (MCC-on command) signal to the *DRDY (drive ready acknowledgement) signal. This tells the CNC that the Digital Servo Drive has successfully powered up. With this connector installed, the axis can be commanded with the Machine Lock (MLK) interface bit active. Position registers will update and blocks will transfer but no actual axis motion occurs. Without this connector, a VRDY OFF error message will occur.

2. CNC Axis Command Plug (for Analog Servo systems) This plug connects to the CNC where the command cable normally resides. It loops back the motor/drive overheat signal and the drive acknowledgement signals. With this connector installed, the axis can be commanded with the Machine Lock (MLK) interface bit active. Position registers will update and blocks will transfer but no actual axis motion occurs. Without this connector, a VRDY OFF and OVERLOAD error message will occur.

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3. Axis Feedback Plug (A quad B type for Digital and Analog Servo) This plug connects to the feedback connector on the axis or master board for digital servo systems. It connects to the servo drive PCB, axis, and master boards for analog systems. It provides the A quad B and Marker signals to the CNC to satisfy the hardware portion of the "Pulse Coder Disconnect" detection circuitry in the CNC. The Motor Overheat input is also jumpered to prevent the "Overload" message on the CRT. This plug can be used on both the Built-in feedback and the Separate-type feedback connections (even though the Motor Overheat sensing is only performed on the Built-in feedback). Use of this plug allows you to isolate each unit and check for errors on the CRT or servo drive (analog only).

4. DRIVE Command Plug (for Digital Servo Drive units) This plug connects to CN1 of the Digital Servo Drive PCB. It allows the MCC contacter to energize if 100Vac is present at T1-3,4 and there are no HV, LV, HC, and OH alarms detected in the drive. For multi-axis drives, any or all drive elements may be jumperedout to allow local powerup and error detection of the drive unit. If a problem is detected with jumpers installed on the drive unit, your troubleshooting attention can be focused on the drive instead of the CNC. Since no PWM signals are connected, no axis motion can occur when the drive is jumpered. For Alpha drives, the same dummy plug can be used with Type A or Type B interface.

5. DRIVE Command Plug (for Analog Servo Drive units) This plug connects to CN1 of the servo drive PCB. It allows the MCC contacter in the Analog Servo Drive to energize if 100Vac is present at T1-3,4 and there are no HV, LV, HC, TG and OH alarms detected in the drive. For multi-axis drives, any or all drive elements may be jumpered-out to allow local powerup and error detection of the drive unit. If a problem is detected with jumpers installed on the drive unit, your troubleshooting attention can be focused on the drive or built-in feedback instead of the CNC. Although VCMD is jumpered to zero, a slight drift in axis motion can occur. If you adjust the balance pot on the drive unit to alter this drift, you will have to check the CNC balance setting (parameter).

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CONNECTIONS:  

       

    

 

 

  





                         

       

    

   

                   

               

        

       

                  

      

                            

           

 

             

      

        

       

       

 

  

           



       

    

  

           



      

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      

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