Electrical Faults - Siemens SIMOTICS SD Operating Instructions Manual

Operation
8.7 faults
8.7.2

Electrical faults

Note
If you are operating the motor with a converter, the operating instructions of the converter must
also be observed 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
94
↓ 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
Mains voltage too low, frequency too
high
Mains voltage 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 the switches and cables.
Check the switches and cables.
Check the power supply conditions.
Check the power supply conditions.
Check the winding connection in the terminal
box.
Determine the winding resistances and insulation
resistances. Carry out repair work after consulta‐
tion with the manufacturer.
Check the connection.
1LE5, 1PC4 shaft heights 280 ... 355
Operating Instructions, 11/2022, A5E41454666A