Mechanical Faults - Siemens SIMOTICS M-1PH8 Operating Instructions & Installation Instructions

Table 8-1 Electrical faults
↓ Motor fails to start
↓ Motor accelerates sluggishly
↓ Humming noise when starting
↓ Humming noise in operation
↓ High temperature rise during no-load operation
↓ High temperature rise under load
X X X X
X
X X X X
X X X
X
X
X
8.9.3

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
X X Poor alignment
X Coupled machine not balanced
X Shocks from coupled machine
X X Resonance with the foundation
X X Changes in foundation
Take into account possible changes which may occur during overheating.
1)
SIMOTICS M-1PH8
Operating Instructions 05/2012 A5E03986435A AA
↓ High temperature rise of individual winding sections
Possible causes of faults
Overload
Interruption of a phase in the
supply cable
Interruption of a phase in the
supply after switching on
X Winding short circuit or phase
short circuit in stator winding
Converter output voltage too
high, frequency too low
External fan is not running
Reduced air intake
Remedial measures
Reduce the load.
Check frequency converters and supply cables.
Check frequency converters and supply cables.
Determine the winding and insulation resistances.
Contact the Service Center.
Check the settings at the frequency converter and
perform the automatic motor identification.
Check the external fan and its connections.
Check the air ducts; clean the machine.
Remedial measures
Establish the cause and realign the parts.
Decouple the rotor and then rebalance it.
Contact the Service Center.
Align the machine set and check the coupling.
Rebalance the coupled machine.
Examine the coupled machine.
Stabilize the foundation following consultation.
Determine the cause of the changes and, if
necessary, rectify. Realign the machine.
Operation
8.9 Faults
1)
83