Electrical Faults; Mechanical Faults; Table 8-1 Electrical Faults; Table 8-2 Mechanical Faults - Siemens SIMOTICS FD 1MH1 Operating Instructions & Installation Instructions

8.12.2

Electrical faults

Note
If you are operating the motor with a converter, the operating instructions of the converter must
also be observed if electrical faults occur.
Table 8-1 Electrical faults
↓ Motor fails to start
↓ Motor accelerates sluggishly
↓ Rumbling noise during startup
↓ Rumbling noise during operation
↓ High temperature rise during no-load operation
↓ High temperature rise with load
X X X X
X
X X X X
X
X
X X X X
X X X
X
8.12.3

Mechanical faults

The following table shows the possible causes of and remedial measures for mechanical faults.
Table 8-2 Mechanical faults
↓ Grinding noise
↓ Overheating
↓ Radial vibrations
↓ Axial vibrations
Possible causes of faults
X Rotating parts are grinding
X Rotor not balanced
X Rotor out of true, shaft bent
SIMOTICS FD 1MH1
Operating Instructions 08/2017
↓ High temperature rise of individual winding sections
Possible causes of faults
Overload
Interrupted phase in the supply cable
Interrupted phase in the feeder cable af‐
ter switching on
Mains voltage too low, frequency too high Check the power supply conditions.
Mains voltage too high, frequency too low Check the power supply conditions.
X Stator winding incorrectly connected
X Winding short circuit or phase short cir‐
cuit in stator winding
Incorrect direction of rotation
Remedial measures
Reduce the load.
Check the switches and cables.
Check the switches and cables.
Check the winding connection in the terminal box.
Determine the winding resistances and insulation
resistances. Carry out repair work after consulta‐
tion with the manufacturer.
Check the connection.
Remedial measures
Establish the cause and realign the parts.
Decouple the rotor and then rebalance it.
Contact the Service Center.
Operation
8.12 faults
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