Faults and their rectification
SIMOTICS S-1FT2 synchronous motors for SINAMICS S120
80
Operating Instructions, 07/2021, A5E50610821B AB
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 re-
sistances and insulation resistances, repair after consultation with manufacturer
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, frequency too low
Check the settings on the frequency converter, perform automatic motor identi-
fication
F
Winding short-circuit or phase
short-circuit in stator winding
Measure the winding resistances and insulation resistances, repair after consul-
tation 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 flow in and
out unimpeded
Cooling air inlet/outlet is blocked
by foreign bodies
Remove the reason for the blocking and ensure that the cooling air can flow in
and out unimpeded
J
Insufficient shielding for motor
and/or encoder 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 gear-
box
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.
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