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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
1MB155 / 1MB555
Operating Instructions, 03/2018, A5E41926185A
↓ High temperature rise of individual winding sections
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
X
Stator winding incorrectly connected
X
Winding short circuit or 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 insula-
tion resistances. Carry out repair work after
consultation with the manufacturer.
Check the connection.
Operation
8.6 faults
103
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