Table 9-2 "Fault causes and remedial measures" key table
No. Fault cause Remedial measures
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 man‐
ufacturer
C Interrupted phase in the feeder cable after
switching on
Check the frequency converter, supply cables and the winding resistances
D Converter output voltage too high, fre‐
quency too low
Check the settings on the frequency converter, perform automatic motor
identication
F Winding short-circuit or phase short-circuit
in stator winding
Measure the winding resistances and insulation resistances, repair after
consultation with the manufacturer, if required, replace the motor
I Heat dissipation impeded by dirt Clean the surface of the drives and ensure that the cooling air can ow in
and out unimpeded
Cooling air inlet/outlet is blocked by for‐
eign bodies
Remove the reason for the blocking and ensure that the cooling air can
ow in and out unimpeded
J Insucient shielding for motor and/or en‐
coder cable
Check the shielding and grounding
K Excessive drive controller gain Adjust the controller
L Rotating parts are grinding Determine cause and adjust parts
Foreign bodies inside the motor Replace the motor
Bearing damage Replace the motor
M Rotor not balanced Replace the motor
N Rotor out of true, shaft bent Consult the manufacturer
O Poor alignment Align motor set, check coupling
P Coupled machine not balanced Re-balance coupled machine
Q Shocks from coupled machine Check coupled machine
R Fault originating from the gearbox Adjust/repair gearbox
If the fault still cannot be resolved after taking the measures stated above, please contact the
manufacturer or the Siemens Service Center.
Faults and their rectication
SIMOTICS S-1FK2 synchronous motors for SINAMICS S120
92 Operating Instructions, 02/2022, A5E46089564B AD
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