Operation
7.2 Dealing with faults
Naturally cooled 1FW6 built-in torque motors
Operating Instructions, 07/2017, 6SN1197-0AF02-0BP2
89
Table 7- 1
Possible faults
Fault
Cause of the fault (see following table)
Motor does not start
A B
D
Motor starts up slowly
A
C D E
Humming noise when starting
C D E
Humming noise during operation
A
C D E
High temperature rise during no-load operation
D
High temperature rise when under load
A
C
Overheating of individual winding sections
E
Uneven running
H
J
Grinding sound, running noise
K
Radial vibrations
L
Axial vibrations
L M
Table 7- 2
Key to causes of faults and remedial measures
No.
Cause of fault
How to remedy the problem
A
Overloading
Reduce load
B
Interrupted phase in the supply cable
Check frequency converter and supply cables
C
Interrupted phase in the supply cable after
switching on
Check frequency converter and supply cables
D
Motor commutation is faulty
Check the commutation, if required re-adjust the
commutation angle offset
E
Winding short circuit or phase short circuit in stator
winding
Measure the winding resistances and insulation
resistances, motor replacement after consultation with
the manufacturer
H
Insufficient shielding for motor and/or encoder cable
Check the shielding and grounding
J
Drive controller gain too high
Adjust the controller
K
Rotating parts grind
Determine cause and adjust parts
Foreign bodies in the motor
Consult the manufacturer
Bearing damage
Contact the manufacturer; where required, repair by the
manufacturer
L
Poor alignment
Align motor unit, check coupling
M
Shocks from coupled machine
Check coupled machine
If the fault still cannot be resolved after applying the measures specified above, please
contact the manufacturer or your local Siemens office.
