Yaskawa MP940 Reference Manual - Manual (Page 361)

Troubleshooting MotionSuite™ MP940 Machine Controller Reference Manual
10-8
A.10
A.10 is the overcurrent or heat sink overheat alarm display. The alarm output
appears below.
Note: The indicates the output transistor is ON; the x indicates the output transistor is OFF (alarm
state).
Status when Alarm Occurred
Note: E ~ H may cause alarms in 1.5kW ~ 3kW servo amplifiers.
Alarm Output
Alarm Code Output ALM Output
ALO1 ALO2 ALO3
x x x
Cause Remedy
A Wiring grounded between servo ampli-
fier and servo motor. Check and correct the wiring.
B Servo motor U, V, or W phase grounded. Replace servo motor.
C Circuit board (1PEB) defective.
Power transistor defective. Replace servo amplifier.
D Current feedback circuit, power transis-
tor, DB circuit, or circuit board defective. Replace servo amplifier.
E The ambient temperature of the servo
amplifier exceeds 55ºC. Lower the ambient temperature
to below 55ºC.
F Poor airflow around heat sink. Make the mounting, peripheral
space as per manual.
G Fan stopped. Replace servo amplifier.
H Running above rated load. Lighten load.
Alarm occurrs during
motor operation
A,B,D,E,
F,G,H
C, D
C
Alarm occurrs at power
ON
Alarm occurrs when servo
ON signal (S-ON) is ON