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TROUBLESHOOTING GUIDE
LSHRM - FLSHRM - PLSHRM - Permanent Magnet Assisted Reluctance motors
5411 en - 2019.04 / b
7 -
TROUBLESHOOTING GUIDE
Incident
Possible cause
Remedy
Abnormal noise Originating in motor or machine being driven?
Uncouple the motor from the equipment being driven
and test the motor on its own
Noisy motor
The cause is mechanical
if the noise persists
after switching off the power supply, with the
drive set to “freewheel” mode
- vibration
- check that the key is suitable for the type of balancing
(see section 3.3)
- damaged bearings
- change the bearings
- mechanical friction: ventilation, coupling
- check installation
The cause is electrical
if the noise stops after
switching off the power supply
- check the power supply at the motor terminals
- check the drive settings
- normal voltage and 3 phases balanced
- check the connection of the terminal block and the
tightening of the connectors
- abnormal voltage
- check the power supply at the terminals of the motor
and the drive supply
- phase imbalance
- check the winding resistance
Other possible causes
:
- incorrect settings
- drive malfunction
- refer to the drive manual
Motor heats
abnormally
- faulty ventilation
- check the environment
- clean the fan cover and the cooling fins
- check that the fan is correctly mounted on the shaft
- unsuitable switching frequency
- comply with the minimum switching frequency indicated on
the motor nameplate
- faulty supply voltage
- check the voltage
- terminal connection fault
- check that the bars are correctly positioned, as described in
section 3.5.3.1.
- overload
- check the current consumption in relation to that indicated
on the motor nameplate
- partial short-circuit
- check the electrical continuity of the windings and/or the
installation
- phase imbalance
- check the winding resistance
Other possible causes
:
- incorrect settings
- drive malfunction
- refer to the drive manual
Motor does not
start
off load
- mechanical obstruction
When disconnected from a power supply:
- check that rotation of the shaft is not blocked
- check that no voltage is present at the motor
terminals
- check the voltage at the motor terminals and the drive
supply voltage as well as electrical protection devices
(e.g. fuses)
- speed feedback (drive message)
- check wiring, drive settings and the operation of the speed
feedback sensor
- thermal protection
- check the continuity of the PTC sensor
On load
- phase imbalance
When disconnected from a power supply:
- check the resistance and continuity of the windings
- drive
- check the settings and sizing (max. current that can be
delivered by the drive)
- speed feedback (drive message)
- check wiring, drive settings and the operation of the speed
feedback sensor
- thermal protection
- check the continuity of the PTC sensor
Refer to the manual for the drive used for the trips displayed by the drive.
