Yaskawa Large Capacity Sigma II Series - Manual (Page 363)

8 Inspection, Maintenance, and Troubleshooting
8.2.1 Troubleshooting Problems with Alarm Displays
8-24
„ A.b1
A.b1: Reference Speed Input Read Error
Display and Outputs
Note: OFF: Output transistor is OFF (alarm state).
Status and Remedy for Alarm
Alarm Outputs
Alarm Code Outputs ALM Output
ALO1 ALO2 ALO3
OFF OFF OFF OFF
Cause Remedy
A Error in reference read-in unit (A/D Con-
verter, etc.). Reset alarm and restart operation.
B Reference read-in unit faulty. (A/D Con-
verter, etc.). Replace SERVOPACK.
C Circuit board (1PWB) defective. Replace SERVOPACK.
At power ON C
During servomotor
operation
A, B