Yaskawa Sigma II Series Servo System - Manual (Page 407)

Sigma II User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
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A.81
A.81: Absolute Encoder Backup Power Supply Error
Display and Outputs
Note: OFF: Output transistor is OFF (alarm state).
Status and Remedy for Alarm
Alarm Outputs
Alarm Code Output
ALM Output
ALO1 ALO2 ALO3
OFF OFF OFF OFF
Cause of the Problem Solution
A
The following power supplies to the
absolute encoder both failed:
• +5V supply
• Battery power
Follow absolute encoder setup procedure.
B Absolute encoder malfunctioned. Replace servomotor.
C Circuit board (1PWB) defective. Replace servo amplifier.
A, B, C
At power ON.
When parameter
Pn002.2 = 0 or 2
When parameter
Pn002.2 = 1
C