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Operation
8.7 faults
8.7
faults
8.7.1
Inspections in the event of faults
Natural disasters or unusual operating conditions, such as overloading or short circuit, are faults
that overload the machine electrically or mechanically.
Immediately perform an inspection after such faults.
Correct the cause of the fault as described in the respective remedial measures section. Repair
any damage to the machine.
8.7.2
Electrical faults
Note
If you are operating the motor with a converter, the operating instructions of the converter must
also be complied with if electrical faults occur.
Table 8-1
Electrical faults
↓ Motor fails to start
↓ Motor accelerates sluggishly
↓ Rumbling noise during startup
↓ Rumbling noise during operation
↓ High temperature rise during no-load operation
↓ High temperature rise with load
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
86
↓ High temperature rise of individual winding sections
Possible causes of faults
Overload
Interrupted phase in the supply cable
Interrupted phase in the feeder cable af‐
ter switching on
Output voltage at the converter too low,
frequency too high
Output voltage at the converter too high,
frequency too low
X
Stator winding incorrectly connected
X
Winding short circuit or phase short cir‐
cuit in stator winding
Incorrect direction of rotation
Remedial measures
Reduce the load.
Check frequency converters and supply cables.
Check frequency converters and supply cables.
Check the settings at the converter (U/f).
Check the settings at the converter (U/f).
Check the winding connection in the terminal
box.
Determine the winding resistances and insulation
resistances. Repair this after prior consultation
with the manufacturer.
Check the connection.
Operating Instructions, 07/2020, A5E46712792A
1FU9
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