Yaskawa MP940 Reference Manual - Manual (Page 366)

MotionSuite™ MP940 Machine Controller Reference Manual Troubleshooting
10-13
A.51
A.51 is the overspeed alarm display. The alarm output appears below.
Note: The indicates the output transistor ON; 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 servo motor wiring. Check and correct the wiring.
(Check for wiring mistakes in the
motor U, V, and W phases.)
B Excessive position/speed reference input. Lower the reference value.
C Mistaken reference input gain setting. Check the user parameter settings.
D Circuit board (1PWB) defective. Replace servo amplifier.
Alarm occurs at Servo ON
(/S-ON) signal ON
Alarm occurs at
high-speed
operation upon
command input
Alarm occurs at power ON
B, C
D A