Mitsubishi Electric M700VS Series Setup Manual page 635

MITSUBISHI CNC
Appendix 2 Explanation of Alarms
Power module overcurrent
Alarm No.
32
Overcurrent protection function in the power module has started its operation.
Investigation details
Disconnect the power cable (U, V, W)
from the unit's terminal block and
motor, and check whether a short-
1
circuit between the power cable or
whether conduction at both end of
wiring occurs with a tester.
Check the motor insulation with a
(megger) tester.
-Between motor power and ground
earth
2
Check the unit capacity.
[1] The same size but smaller than the
selected capacity.
[2] The combination of the motor and
axis is alternated in a 2-axis unit.
Check the current loop gain
3
parameters.
Jiggle the detector connectors (drive
4 unit side and detector side) and check
if they are disconnected.
Turn the power OFF, and check the
5 detector cable connection with a
tester.
6 Check the repeatability.
Replace with another unit, and check
7 whether the fault is on the drive unit
side or detector side.
Check for any abnormalities in the
unit's ambient environment.
8
(Ex.: Ambient temperature, noise,
grounding)
618
Investigation results
[1] Before disconnecting the power
cable, the cable connector or screw
has been loosened.
[2] The short-circuit condition persists
even after disconnecting the cable
from the unit and motor.
There is no problem.
Less than 1M . (Grounding)
1M or more. (Normal)
The capacity is small.
The smaller capacity side was used in
2-axis unit.
The motor meets the selected
capacity.
Different from the standard parameter
settings.
Equivalent to the standard parameter
settings.
The connector is disconnected (or
loose).
The connector is not disconnected.
Connection is faulty.
Connection is normal.
The state returns to normal once, but
occurs sometimes thereafter.
The error is always repeated.
The alarm is on the drive unit side.
The alarm is on the detector side.
Take remedies according to the causes of the abnormality in the ambient
environment.
Remedies
[1] Tighten it.
[2] Check the motor wiring.
[3] Replace the power cable.
Check the investigation item No. 2.
Replace the motor.
Check the investigation item No. 3.
Replace to the unit of the selected
capacity or change the axis.
Check the investigation item No. 3.
Adjust the value to the standard
setting.
Check the investigation item No. 4.
Correctly install.
Check the investigation item No. 5.
Replace the detector cable.
Check the investigation item No. 6.
Check the investigation item No. 8.
Check the investigation item No. 7.
Replace the drive unit.
Replace the detector.
SV SP