Yaskawa MP940 Reference Manual - Manual (Page 383)

Troubleshooting MotionSuite™ MP940 Machine Controller Reference Manual
10-30
A.CA
A.CA is the alarm display for encoder parameter errors. 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 Encoder defective. Replace servo motor.
B Servo amplifier defective. Replace servo amplifier.
Alarm occurs at power ON A, B