Series 16/18/160/180-Model C Maintenance Manual, GFZ-62755EN ...

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8. TROUBLESHOOTING B–62755EN/018.33ALARM 920, 922(WATCH DOG ORRAM PARITY)points Watch dog timer alarm RAM parity error920: Watch dog alarm or RAM parity in servo control modulehas occurred in servo control module on the main CPU board922: Above alarm has occurred in servo control module on the option 3boardThe timer used to monitor the operation of CPU is called the watch dogtimer. The CPU resets timer time every time a constant time has passed.When an error occurs in CPU or peripheral device, timer is not reset butthe alarm is informed.Refer to alarm 910 to 915Causes and Remedies Servo control module isfaultyThe servo module includes servo RAM, watch dog timer circuit, etc.Defectiveness of hardware, abnormality or malfunctioning of detectioncircuit or the like is considered. Therefore, replace servo module on themain CPU board for alarm 920 and 921; replace servo module on theoption 2 board for alarm 922 and 923.MainCPUROMRAMServo module(A20B–2902–0061, A20B–2902–0070) Main CPU board is faulty CNC control softwareROM module is faulty Power supply unit isfaultyCPU or peripheral circuits may be faulty. Replace the main CPU board.Software may not work properly due to failure of FROM module. ChangeFROM module.DC output voltage of power supply unit may be faulty. Replace the powersupply unit.378
B–62755EN/018.TROUBLESHOOTING Main CPU board (3) FROM moduleSpecification : A20B–2902–0341,0343A20B–2902–0411A20B–2902–0500, 0501(9) Servo module of 1st, 2nd axisSpecification : A20B–2902–0061, 0070(8) Servo module of 3rd, 4th axisSpecification : A20B–2902–0061, 0070(7) Servo module of 5th, 6th axisSpecification : A20B–2902–0061, 0070379
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GE Fanuc AutomationComputer Numeric
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B-62755EN/01PREFACEPREFACEDescripti
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B-62755EN/01PREFACERelated manualsT
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B-62755EN/01 2.7 HOW TO REPLACE TH
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B-62755EN/01 7. AC SPINDLE (ANALOG
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B-62755EN/012. HARDWARE2.5.2Main CP
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B-62755EN/012. HARDWARE2.5.4Option
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B-62755EN/012. HARDWARE2.6.3Control
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B-62755EN/012. HARDWARE2.6.4Modules
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B-62755EN/015. DIGITAL SERVO(2)MOTO
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Page 425 and 426: B-62755EN/01APPENDIXA. I/O UNIT MOD
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B-62755EN/01APPENDIXC. LIST OF MAIN
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B-62755EN/01APPENDIXD. BOOT SYSTEMD
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B-62755EN/01ENOTATIONAPPENDIXOF MDI
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B-62755EN/01Numbers16-TC/MC, 160-TC
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B-62755EN/01INDEXMMain CPU board, 1
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Revision RecordFANUC MAINTENANCE
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Series 16/18/160/180-Model C Maintenance Manual, GFZ-62755EN ...

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