Operation
8.2 Faults
1FT7 synchronous motors
Operating Instructions, 04/2010, 610.40075.40b
45
Table 8- 2 Key to causes of faults and remedial measures
No. Cause of fault How to remedy
A Overload Reduce load
B Interruption of a phase in the supply
cable/motor winding
Check the frequency converter and supply cables/measure the winding
resistances and insulation resistances, repair after consultation with
manufacturer
C Interruption of a phase in the supply cable
after switching on
Check the frequency converter and supply cables/check the winding
resistances
D Converter output voltage too high,
frequency too low
Check the settings on the frequency converter, perform automatic motor
identification
F Winding short circuit or phase short circuit
in stator winding
Measure the winding resistances and insulation resistances, repair after
consultation with manufacturer
Cooling water not connected/switched off Check cooling water connection/switch on cooling water G
Water connection/pipes defective Locate leaks and seal as necessary, or consult the manufacturer
Cooling water flow rate too low Increase cooling water flow rate H
Inlet temperature too high Set correct inlet temperature
Heat dissipation impeded by deposits Clean the surface of the drives and ensure that the cooling air can flow
in and out unimpeded
Cooling air inlet and/or outlet is blocked
by foreign bodies
Remove the blockage and ensure that the cooling air can flow in and
out unimpeded
I
Fan motor does not start up Make sure that the fan motor works properly
J Insufficient shielding for motor and/or
encoder cable
Check the shielding and grounding
K Drive controller gain too high Adjust the controller
Rotating parts are grinding Determine cause and adjust parts
Foreign bodies in the motor Send to manufacturer for repair
L
Bearing damage Send to manufacturer for repair
M Rotor not balanced Decouple rotor and rebalance
N Rotor out of true, shaft bent Consult the manufacturer
O Poor alignment Align motor unit, check coupling
P Coupled machine not balanced Re-balance coupled machine
Q Shocks from coupled machine Check coupled machine
R Imbalance originating from gearing Adjust/repair gearing
S Cooling water pipes/water connection
defective
Locate leaks and seal as necessary, or consult the manufacturer
If the fault still cannot be resolved after applying the measures specified above, please
contact the manufacturer or the Siemens Service Center.
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