Yaskawa MP940 Reference Manual - Manual (Page 375)

Troubleshooting MotionSuite™ MP940 Machine Controller Reference Manual
10-22
A.85
A.85 is the alarm display for an encoder overspeed. 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 x x
Cause Remedy
A Absolute encoder turned ON at a speed
exceeding 200rpm.
Turn the encoder power ON with the servo
motor stopped.
B Circuit board (1PWB) defective. Replace servo amplifier.
Alarm occurs at power ON A, B