Siemens 1FT7 Operating Instructions Manual page 45

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