Yaskawa Sigma II Series Servo System - Manual (Page 413)

Sigma II User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
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A.b1, A.b2
A.b1: Reference Speed Input Read Error
A.b2: Reference Torque Input Read Error
The alarm output, status, and remedy for A.b1 are the same as for A.b2.
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
Error in reference read-in unit (A/
D Converter, etc.).
Reset alarm and restart opera-
tion.
B
Faulty reference read-in unit (A/D
Converter, etc.).
Replace servo amplifier.
C Defective circuit board (1PWB). Replace servo amplifier.
During servomotor operation. At power ON. A, B A, B, C