Mitsubishi Electric MELDAS MDS-B Series Instruction Manual page 171

Power module error (Overcurrent):
Alarm No.
The IPM used for the inverter detected an overcurrent.
32
Investigation details
1 Check whether the unit's output U, V
and W phases are short circuited.
•
Disconnect the U V W connection
from the terminal block and the
motor's cannon plug, and check
between UVW with a tester.
2 Check whether there is a ground fault in
the UVW wires.
•
Check between the UVW wires and
ground with a tester in the state given
in item 1.
3 Check whether there is a ground fault in
the motor.
•
Check between the motor's UVW
wires and ground with a tester
(megger) in the state given in item 1.
4 Check the servo parameter setting
values.
Refer to the adjustment procedures.
5 Wiggle the connectors by hand to check
whether the detector connectors (unit
side and detector side) are
disconnected.
6 Turn the power OFF, and check the
detector cable connection with a tester.
7 Check the repeatability.
8 Connect to another normal axis driver,
and check whether the fault is on the
unit side or scale side.
9 Check if there is any abnormality in the
unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
Chapter 11 Troubleshooting
Investigation results
The phases are short circuited or there
is no continuity.
The phases are normal.
The phases are short circuited or there
is no continuity.
The phases are normal.
The phases are short circuited or there
is no continuity.
The phases are normal.
(same level as other axes)
The settings are incorrect.
The settings are correct.
The connector is disconnected (or
loose).
The connector is not disconnected.
There is a connection fault.
The connection is normal.
The alarm is not repeated.
The alarm is repeated sometimes.
The alarm is always repeated.
The alarm is on the unit side.
The alarm is on the detector.
No abnormality is found in particular.
An abnormality was found in the
ambient environment.
11–15
Alarm check timing
f1 f2
–
Remedies
Replace the UVW wires.
Investigate item 2.
Replace the UVW wires.
Investigate item 3.
Replace the motor.
Investigate item 4.
Correctly set.
Investigate item 5.
Correctly install.
Investigate item 6.
Replace the detector cable.
Investigate item 7.
Investigate item 9.
Investigate item 9.
Investigate item 8.
Replace the drive unit.
Replace the motor (the detector).
Monitor the state for a while.
Take remedies according to the causes of
the abnormality.
Ex. High
temperature ... Check the
cooling
fan.
Incomplete grounding .... Additionally
f3 f4
ground.