↓ 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
↓ High temperature rise of individual winding sections
Possible causes of faults
Remedial measures
X
X
X
X
Interruption of a phase in the feeder
cable after switching on
Check the frequency converters and feeder cables.
X
X
X
X Winding short circuit or interphase
short circuit in stator winding
Determine the winding and insulation resistances.
Contact the Service Center.
X
Converter output voltage too high,
frequency too low
Check the settings at the frequency converter and
perform the automatic motor identification.
X
X
Cooling water not connected
Cooling water supply switched off
Water connection / pipes defective
Check the cooling water connection. Switch on the
cooling water supply.
Find the leak and seal it. Contact the Service Center.
X
X
Cooling water flow rate too low
Intake temperature too high
Increase the cooling water flow rate.
Set the correct intake temperature.
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
Remedial measures
X
Rotating parts are grinding
Establish the cause and realign the parts.
X
Rotor not balanced
Decouple the rotor and then rebalance it.
X
Rotor out of true, shaft bent
Contact the Service Center.
X X Poor alignment
Align the machine set and check the coupling.
1)
X
Coupled machine not balanced
Rebalance the coupled machine.
X Shocks from coupled machine
Examine the coupled machine.
X X Resonance of the overall system comprising mo‐
tor and foundation
Reinforce the foundation after prior consultation with the
Service Center.
X X Changes in foundation
Determine the cause of the changes and, if necessary,
rectify. Realign the machine.
X
Reduced air supply, direction of rotation of fan
possibly incorrect
Check the air ducts; clean the machine.
X X Uneven gearbox operation
Resolve any gearbox faults.
1)
Take into account possible changes which may occur during overheating.
Operation
8.10 Faults
SIMOTICS M-1PH8 1PH818., 1PH822., 1PH828.
102
Operating Instructions 10/2017
Summary of Contents for SIMOTICS M-1PH818
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Page 104: ...Operation 8 10 Faults SIMOTICS M 1PH8 1PH818 1PH822 1PH828 104 Operating Instructions 10 2017 ...
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