Yaskawa Sigma II Series Servo System - Manual (Page 416)

Sigma II User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
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A.C9
A.C9: Encoder Communications Error
Display and Outputs
Note: OFF: Output transistor is OFF (alarm state).
ON: Output transistor is ON.
Status and Remedy for Alarm
Alarm Outputs
Alarm Code Output
ALM Output
ALO1 ALO2 ALO3
ON OFF ON OFF
Cause of the Problem Solution
A
Incorrect or disconnected
encoder wiring.
Check wiring and connectors at
the encoder.
B Defective encoder. Replace servomotor.
C Defective servo amplifier. Replace servo amplifier.
D
Excessinve vibration/shock to
motor.
Reduce vibration/shock
During servomotor operation. At power ON. A, B, C A, B, C