Operation
8.6 faults
Standard motors SH 63 ... 355
Operating Instructions, 12/2018, A5E38483075A
93
8.6.2
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
↓ High temperature rise of
individual winding sections
Possible causes of faults
Remedial measures
X X
X
X
Overload
Reduce the load.
X
Interrupted phase in the supply cable
Check the switches and cables.
X X X
X
Interrupted phase in the feeder cable
after switching on
Check the switches and cables.
X
Mains voltage too low, frequency too
high
Check the power supply conditions.
X
Mains voltage too high, frequency too
low
Check the power supply conditions.
X X X X
X Stator winding incorrectly connected
Check the winding connection in the terminal
box.
X X X
X Winding short circuit or phase short
circuit in stator winding
Determine the winding resistances and insula-
tion resistances. Carry out repair work after
consultation with the manufacturer.
X
Incorrect direction of rotation
Check the connection.
