Operation
5.3 Fault diagnosis table
A5E01083943A AB
Siemens AG Operating Instructions 2.02 1FW4
69
Electrical faults
Table 5-1 Fault table, electrical causes
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Possible causes of faults Remedial measures
1)
X X X X Overload Reduce load
X Interruption of a phase in the supply cable Check switches and supply cables
X X X X Interruption of a phase in the supply after
switching on
Check switches and supply cables
X X X X X Stator winding incorrectly connected Check winding connections
X X X X Winding short circuit or phase short circuit
in stator winding
Measure the winding resistances and
insulation resistances, repair after
consultation with manufacturer
X X Rotor (partially) demagnetized Repair after consultation with
manufacturing plant
X Wrong direction of rotation of the external
fan
Check connections
(1) Apart from eliminating the cause of the fault (as described under "Remedial measures"), you must also rectify any
damage the motor may have suffered.
Mechanical faults
Table 5-2 Fault table, mechanical causes
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Possible causes of faults Remedial measures
1)
X Rotating parts are grinding Determine cause and adjust parts
X Reduced cooling Check the water flow, clean the motor and/or
check the external fan
X Rotor not balanced Consult the manufacturer
X Rotor out of true, shaft bent Consult the manufacturer
X X Poor alignment Align machine set, check coupling
2)
X Coupled motor out of balance Balance the coupled motor
X Coupled motor knocking Check coupled motor
X X Resonance of the overall system comprising motor and
foundation
After consultation, reinforce foundations
X X Changes in foundation Determine cause of changes, eliminate if
necessary; realign motor
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