Electrical Faults - Siemens SIMOTICS A 1FU9 Operating Instructions Manual

9.7.2

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 9-1 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
1FU9
Operating Instructions, 10/2023, A5E46712792A
↓ 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.
Operation
9.7 faults
99