YASKAWA MECHATROLINK Sigma 2 Series User Manual page 179

9 Troubleshooting
A.81
A.81: Encoder Backup Error
Display and Outputs
Alarm Outputs
Alarm Code Outputs
ALO1 ALO2
OFF OFF
Note: OFF: Output transistor is OFF (alarm state).
Status and Remedy for Alarm
At power ON
Pn002.2 = 0
Pn002.2 = 1
Cause
A
The following power supplies to the absolute
encoder all failed:
• +5 V supply (supplied from the
SEROVPACK)
• Battery power
B Absolute encoder malfunctioned.
C Circuit board (1PWB) is defective.
ALM Output
ALO3
OFF OFF
At SENS_ON command
A, B, C
C
Follow absolute encoder set-up procedure.
Replace the servomotor.
Replace the SERVOPACK.
9-4
A, C
Remedy