Yaskawa MP940 Reference Manual - Manual (Page 359)

Troubleshooting MotionSuite™ MP940 Machine Controller Reference Manual
10-6
A.04
A.04 is the alarm display for user parameter setting 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 x x
C Remedy
A An out-of-range parameter was
previously set or loaded. Reset all user parameters in the range, or re-load
the correct user parameters.
B Circuit board (1PEB) defective. Replace servo amplifier.
Rises at Power ON A, B