Yaskawa MP940 Reference Manual User 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