Mechanical Faults - Siemens SIMOTICS HT Series Operating Instructions & Installation Instructions

Operation
8.8 Faults
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
X X
X X
8.8.3

Mechanical faults

Table 8-2 Mechanical faults
↓ Grinding noise
↓ 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.
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↓ High temperature rise of individual winding sections
Possible causes of faults
Rotor (partially) demagnetized
Overload
Interruption of a phase in the feeder
cable
Interrupted phase in the feeder ca‐
ble after switching on
X Winding short circuit or inter-phase
short circuit in stator winding
Converter output voltage too high,
frequency too low
Cooling water not connected
Cooling water supply switched off
Water connection / pipes defective
Cooling water flow rate too low
Inlet temperature too high
Remedial measures
Contact the Service Center.
Reduce the load.
Check the frequency converters and feeder cables.
Check the frequency converters and feeder cables.
Determine the winding resistances and insulation re‐
sistances. Contact the Service Center.
Check the settings at the frequency converter and
perform the automatic motor identification.
Check the cooling water connection. Switch on the
cooling water supply.
Find the leak and seal it. Contact the Service Center.
Increase the cooling water flow.
Set the correct upstream temperature.
Remedial measures
Establish the cause and realign the parts.
Contact the Service Center.
Contact the Service Center.
Align the machine set and check the coupling.
Rebalance the coupled machine.
Examine the coupled machine.
Stabilize the foundation after prior discussion.
Determine the cause of the changes and, if necessa‐
ry, rectify. Realign the machine.
SIMOTICS HT Series HT-direct 1FW4...1......A
1)
Operating Instructions 11/2018