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