Bearing Maintenance; Preventive Maintenance - Leroy-Somer LSRPM Series Installation And Maintenance Manual

LEROY-SOMER

3.3 - Bearing maintenance

3.3.1 - Checking the bearings
As soon as you detect any of the following on the motor:
- abnormal noise or vibration
- abnormal temperature rise of the bearing when it is correctly
greased, the state of the bearings must be checked.
Damaged bearings must be replaced as soon as possible
to prevent worse damage to the motor and the equipment
being driven.
When one bearing needs to be replaced, the other bearing
must also be replaced.
The seals should be changed routinely when the bearings
are changed.
The free bearing must allow the rotor shaft to expand (check its
identification during dismantling).
3.3.2 - Reconditioning the bearings
Bearings without grease nipples
Dismantle the motor (see section 6.1); remove the old grease
and clean the bearings and accessories with degreasing agent.
Fill with new grease: the correct amount of new grease for the
bearing is 50% of the free space.

4 - PREVENTIVE MAINTENANCE

Please consult LEROY-SOMER who, in its continuous search
for ways to help customers, has evaluated numerous methods
of preventive maintenance.
The diagram and table below give the recommended equip-
ment to use and the ideal positions to take measurements of all
parameters which can affect the operation of the machine, such
as eccentricity, vibration, state of the bearings, structural
problems, electrical problems, etc.
Detector
1 - Accelerometer For measuring vibrations
2 - Photo-electric cell For measuring speed and phase (balancing)
3 - Clamp ammeter For measuring current (DC and 3-phase AC)
4 - Voltage probe For measuring voltages
5 - Infra-red probe For measuring temperature
Installation and maintenance
LSRPM - PLSRPM
Synchronous permanent magnet motors
Measurement
Bearings with grease nipples
Always begin by cleaning the waste grease channel
When using the type of grease indicated on the nameplate,
remove the covers and clean the grease nipple heads.
When using a different grease from that indicated on the name-
plate, the motor must be dismantled and the bearings and
accessories cleaned with degreasing agent (carefully clean
the grease inlet and outlet channels) to remove the old grease
before regreasing.
To ensure correct lubrication, fill the inner free spaces of the
bearing retainers, flanges and grease channels and 30% of the
bearing free space.
Then run the motor at low speed (< 500 min
grease.
Warning:
Too much grease causes the bearing to overheat (statistics
show that more bearings are damaged through too much
grease than too little grease).
Important note:
The new grease must be recently manufactured, of an equiva-
lent performance level and must not contain any impurities
(dust, water, etc.).
M 01V
3
1
5
M 01H
Measurement points
M 01V M 01H M 02V M 02H M 02A Shaft
• • • •
• •
4155 en - 2012.05 / e
) to distribute the
–1
M 02V
4
2
M 02A
M 02H
E01 E02
•
•
• • •
• • •
E03
19