Yaskawa FSP Amplifier - Manual (Page 297)

FSP Amplifier User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
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„ A.Cb: Encoder Echoback Error
Display and Outputs
Alarm Outputs
Alarm Code Output
ALO1 ALO2 ALO3
ALM Output
ON OFF ON OFF
Note: OFF: Output transistor is OFF (alarm state).
ON: Output transistor is ON.
Status and Remedy for Alarm
At power ON. A, B
Cause of the Problem Solution
A
Incorrect or disconnected
encoder wiring. Check wiring and connectors
at encoder.
B Defective encoder. Replace servomotor.
C Defective servo amplifier. Replace servo amplifier.