Troubleshooting Method - Fuji Electric Alpha7 VV User Manual

CHAPTER 7 MAINTENANCE AND INSPECTION

7.3 Troubleshooting Method

1. Overcurrent
[Display]
AL. o c1
AL. o c2
[Cause and remedy]
Wrong servomotor output wiring
Short circuit or grounding fault in
servomotor output wiring
Servomotor insulation fault
7
Failure of servomotor
Incorrect resistance of regenerative
resistor
Current imbalance caused by an encoder
fault
Unconnected grounding cable
7-8
Troubleshooting Method
[Description of detected alarm]
The output current of the servo amplifier exceeds the rated value.
OC1: Direct detection by internal transistor of servo amplifier
OC2: Indirect detection with software of servo amplifier
Cause Remedy
 Correct the wiring of power cables (U, V and W).
 Check cables visually or through continuity check
and replace the defective cable.
 Measure the insulation resistance. (Several MΩ or
over to ground)
 Measure the resistance across cables. (Several Ω
between cables)
 Replace with the regenerative resistor within the
rating.
 Replace the servomotor.
 Connect the grounding cable.