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MITSUBISHI CNC
Appendix 2 Explanation of Alarms
Excessive error 3
Alarm No.
54
When an excessive error 1 occurred, detection of the motor current failed.
Investigation details
Check that the PN voltage is supplied
1
to the drive unit.
[1] Is the CHARGE lamp ON?
Check the motor power cable (U, V, W
phases).
2
[1] The power cable is not connected.
[2] Is the cable connected to the motor
for another axis?
Supplement (servo)
Depending on the ideal machine position in respect to the command position, the actual machine
position could enter the actual shaded section shown below, which is separated more than the
distance set in OD1.
Position
Servo OFF
630
Investigation results
The voltage is not supplied.
It is correctly supplied (DC300V).
The connections are incorrect.
The connections are correct.
Command position
OD1
OD2
OD2
OD1
Servo ON
Remedies
Correctly supply the PN voltage.
Investigate item 2.
Connect correctly.
Replace the drive unit.
Ideal machine position
Time
SV SP
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Troubleshooting
