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INSTALLATION AND MAINTENANCE
CPLS drip-proof 3-phase induction motors
4240 en - 2014.09 / b
LEROY-SOMER
6 - CORRECTIVE MAINTENANCE:
6.1 - General information
First switch off and lock the power supply.
Open the terminal box, identify the wires and their position.
- Disconnect the power supply wires.
- Uncouple the motor from the equipment being driven.
Always use an extractor to remove any devices mounted on
the motor shaft extension.
6.2 - HV1, HV2 and CPLS 132 HV3
standard motors
6.2.1 - Dismantling the motor
It is advisable to identify the shields in relation to the stator.
- Remove the encoder: disconnect its connection and loosen
the encoder driving ring. Slide the encoder and its anti-rotation
foot over the shaft and pull it out fully.
- Remove the forced ventilation unit (11) by undoing the
4 screws on the base.
- Open the terminal box (10).
-
Mark the position of the stator connection cables in the
terminal box.
- Disconnect the stator connection cables by unscrewing
the nuts.
- Remove the terminal plate (7).
- Remove the terminal box (8) by undoing all 4 screws, then the
terminal box support plate (6), by undoing all 4 countersunk
head screws (this will make reassembly easier).
- Remove the key, taking care not to damage the keyway.
- Unscrew the nuts holding the end shields (5) and (13).
- Undo the DE and/or NDE inner bearing retainer fixing screws
(if necessary).
- Using a bronze drift, remove the shields (5) and (13) by
tapping gently on the inside of the flange (above and below the
shutters – inspection doors). During this operation, support the
shields with a lifting system, taking care not to damage the
winding.
- Recover the preloading washer and/or spacer washers from
the bearings. Caution, they are in different positions at the
drive end and the non-drive end.
Note their position.
- Remove the circlip and/or the bush ring from the bearings (3)
and (15) if necessary (flanged motor).
- Remove the rotor from the stator (1), taking care not to touch
the winding.
- Pull out the bearings (3) and (15) using a bearing remover,
while protecting the end of the shaft extension with a washer.
Avoid knocking the running surfaces of the shaft.
6.2.2 - Before reassembling
Stator:
- Remove all dust from the stator: if the winding needs to be
cleaned, a suitable liquid must be used: dielectric and inert on
the insulating components and the external finish.
- Check the insulation (see section 2.1) and if necessary, dry
the stator in a drying cabinet.
- Clean the spigots, and remove all traces of impact on the
mating surfaces if necessary.
Rotor:
- Clean and check the bearing running surfaces. If they are
damaged, renew the running surfaces or change the rotor.
- Check the condition of the threads, keys and their housings.
End shields:
- Clean off any traces of dirt (old grease, accumulated
dust, etc).
- Clean the bearing housings and the spigot.
- If necessary, apply anti-flash varnish inside the shields.
- Clean the bearing retainers and the grease valves carefully.
Mounting the bearings on the shaft
The reference numbers for the bearings to be used are
indicated on the motor nameplate.
This operation is extremely important, as the slightest
indentation of a ball on the bearing tracks would cause noise
and vibration.
Lightly lubricate the running surfaces of the shaft.
There are several ways of mounting the bearings correctly:
- Cold state: the bearings must be mounted without any impact,
using a spanner
(do not use a hammer)
. The force applied
must not be transferred to the bearing track. You should
therefore use the internal cage for support (taking care not to
press on the seal shield for sealed bearings).
- Hot state: Heat the bearing to between 80 and 100°C: in a
drying cabinet, an oven or on a heating plate.
(A blowtorch must never be used for heating, just as an oil bath
must never be used for heating permanently greased bearings).
Содержание CPLS 112
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