20
Installation and maintenance
LSRPM - PLSRPM
Synchronous permanent magnet motors
LEROY-SOMER
4155 en - 2012.05 / e
5 - 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 conforms to the type of
balancing (see section 2.3)
- damaged bearings
- change the bearings
- mechanical friction: ventilation, coupling
- check
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 terminals
- abnormal voltage
- check the power supply line
- 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
- faulty supply voltage
- check
- terminal connection fault
- check
- 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
at no load
- mechanical locking
When switched off:
- check that rotation of the shaft is locked
(Note: the rotor magnets generate resistance to
rotation)
- broken power supply line
- check the fuses, electrical protection, starting
device
- position feedback (drive message)
- check the drive wiring and settings, operation of the
position sensor
- thermal protection
- check
on load
- phase imbalance
When switched off:
- check the direction of rotation (phase order)
- check the resistance and continuity of the windings
- check the electrical protection
- drive
- check the settings and sizing (max. current that can be
delivered by the drive)
- position feedback (drive message)
- check the drive wiring and settings, operation of the
position sensor
- thermal protection
- check
