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6.6.2
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 6-1 Electrical faults
↓ Motor fails to start
X X
X
X X X X
124
↓ 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
X
X
X X X
X
X
X
X Stator winding incorrectly
X X X
X Winding short circuit or
X
Possible causes of faults
Overload
Interrupted phase in the
supply cable
Interrupted phase in
the feeder cable after
switching on
Mains voltage too low,
frequency too high
Mains voltage too high,
frequency too low
connected
phase short circuit 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
consultation with the
manufacturer.
Check the connection.
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