Yaskawa MP940 Reference Manual - Manual (Page 382)

MotionSuite™ MP940 Machine Controller Reference Manual Troubleshooting
10-29
A.C9
A.C9 is the alarm display for an encoder communication error. The alarm
output appears below.
Note: The x indicates the output transistor is OFF (alarm state).
Status when Alarm Occurred
Alarm Output
Alarm Code Output ALM Output
ALO1 ALO2 ALO3
>_ x › _ x
Cause Remedy
A Mistaken encoder wiring. Review the encoder wiring.
B Encoder defective. Replace servo motor.
C Servo amplifier defective. Replace servo amplifier.
Alarm occurs at motor ON A, B, C
Alarm occurs during motor
operation
A, B, C