Siemens SIMOTICS S-1FK7 - Page 112

Faults and their rectification
1FK7 G2 synchronous motors
110 Operating Instructions, 05/2021, A5E50907562B AA
Table 8- 1 Possible faults
Fault
Fault cause (see "Fault causes and remedial measures"
key table)
Motor does not start
A
B
Motor starts slowly
A
C
F
Humming sound when starting
C
F
Humming sound in operation
A
C
F
High temperature rise under no-load
operation
D
I
High temperature rise under load
A
C
I
High temperature rise of individual
winding sections
F
Uneven running
J
K
Grinding sound, running noise
L
Radial vibrations
M
N
O
P
R
Axial vibrations
O
Q
R
Table 8- 2 "Fault causes and remedial measures" key table
No.
Cause of fault
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
manufacturer
C
Interrupted phase in the feeder cable
after switching on
Check the frequency converter and supply cables/check the winding
resistances
D
Converter output voltage too high, fre-
quency too low
Check the settings on the frequency converter, perform automatic mo-
tor identification
F
Winding short-circuit or phase short-
circuit in stator winding
Measure the winding resistances and insulation resistances, repair after
consultation with manufacturer
I
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/outlet is blocked by for-
eign bodies
Remove the block and ensure that the cooling air can flow in and out
unimpeded
Fan motor does not start
Check the fan motor to ensure that it is functioning correctly
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
Send to manufacturer for repair
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 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 unit
Adjust/repair gear unit
If the fault still cannot be resolved after taking the measures stated above, please contact the
manufacturer or the Siemens Service Center.