Mechanical Faults - Siemens SIMOTICS M-1PH818 Operating And Installation Instructions

Operation
8.10 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
8.10.4

Mechanical faults

The following table shows the possible causes of and remedial measures for mechanical faults.
Table 8-3 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 of the overall system comprising mo‐
tor and foundation
X X Changes in foundation
X Reduced air supply, direction of rotation of fan
possibly incorrect
X X Uneven gearbox operation
Take into account possible changes which may occur during overheating.
1)
102
↓ High temperature rise of individual winding sections
Possible causes of faults
Interruption of a phase in the feeder
cable after switching on
X Winding short circuit or interphase
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
Intake temperature too high
Remedial measures
Check the frequency converters and feeder 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 cooling water connection. Switch on the
cooling water supply.
Find the leak and seal it. Contact the Service Center.
Increase the cooling water flow rate.
Set the correct intake temperature.
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.
Reinforce the foundation after prior consultation with the
Service Center.
Determine the cause of the changes and, if necessary,
rectify. Realign the machine.
Check the air ducts; clean the machine.
Resolve any gearbox faults.
SIMOTICS M-1PH8 1PH818., 1PH822., 1PH828.
1)
Operating Instructions 10/2017