Yaskawa Sigma II Series Servo System - Manual (Page 415)

Sigma II User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
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A.C8
A.C8: Absolute Encoder Clear Error and Multi-turn Limit Setting 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 Encoder defective. Replace servomotor.
B Servo amplifier defective. Replace servo amplifier.
At power ON.
When resetting the multi-turn
clear encoder alarm.
A, B A, B