8.10.2 Electrical faults at force-ventilated motors
Note
When operating the machine with a converter, also refer to the operating instructions of the
frequency converter if electrical faults occur.
Table 8-1 Electrical faults
↓ Motor fails to start
↓ Motor accelerates sluggishly
↓ Humming noise when starting
↓ Humming noise in operation
↓ High temperature rise under load
↓ High temperature rise of individual winding sections
Possible causes of faults Remedial measures
X X Rotor (partially) demagnetized Contact the Service Center.
X X X X Overload Reduce the load.
X Interruption of a phase in the
feeder cable
Check the frequency converters and feeder cables.
X X X X Interrupted phase in the feeder
cable after switching on
Check the frequency converters and feeder cables.
X X X X Winding short circuit or inter-
phase short circuit in stator wind‐
ing
Determine the winding resistances and insulation resistan‐
ces. Contact the Service Center.
X Converter output voltage too
high, frequency too low
Check the settings at the frequency converter and perform
the automatic motor identification.
X External fan is not running Check the external fan and its connections.
X Reduced air intake Check the air ducts; clean the machine.
8.10.3 Electrical faults at water-cooled motors
Note
When operating the machine with a converter, also refer to the operating instructions of the
frequency converter if electrical faults occur.
Operation
8.10 Faults
SIMOTICS M-1PH8 1PH818., 1PH822.
Operating Instructions 07/2016 97
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