Mitsubishi Electric MELSERVO-J4 Instruction Manual Trouble Shooting page 26

1. TROUBLESHOOTING
Alarm No.: 24 Name: Main circuit error
Alarm content
Detail
Detail name
No.
24.1 Ground fault (1) The servo amplifier is
detected by
hardware
detection circuit
(2)
(3) A ground fault occurred
(4)
(5) Something near the
24.2 Ground fault Check it with the check method for [AL. 24.1].
detected by
software
detection
function
A ground fault occurred on the servo motor power lines.
A ground fault occurred at the servo motor.
Cause
Disconnect the servo
malfunctioning. motor power cables
(U, V, and W) and
check if the alarm
occurs.
A ground fault or short Check if only the servo
occurred at the servo motor power cable is
motor power cable. shorted.
Disconnect the servo
at the servo motor. motor power cables on
motor side, and check
insulation of the motor
(between U, V, W, and
The main circuit power Shut off the power,
supply cable and servo and check if the main
motor power cable were circuit power supply
shorted. cable and servo motor
power cable are in
contact.
Check the noise,
device caused it. ambient temperature,
etc.
Check method Check result
It occurs.
It does not occur.
It is shorted.
It is not shorted.
It is shorted.
It is not shorted.
).
They are in contact.
They are not in
contact.
It has a failure.
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Action Target
Replace the servo [A]
amplifier. [B]
[WB]
Check (2).
[RJ010]
Replace the servo
motor power cable.
Check (3).
Replace the servo
motor.
Check (4).
Correct the wiring.
Check (5).
Take
countermeasures
against its cause.