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Installation and maintenance - Three-phase induction motors
4850 en - 2018.11 / f
FLS/FLSES MOTORS
11.4 - FLS/FLSES 225 M to 280 motors
11.4.1 - Dismantling the NDE shield
- Remove the fixing screws (27) and then take off the cover
(13).
- Remove the shaft extension screw if necessary.
- Take out the fan (7).
- Remove the fixing screws from the inner NDE bearing retainer
(53).
- Remove the fixing screws (273) from the NDE shield (6).
- Remove the fan key if appropriate.
- Using two levers or a flexible hammer, disengage the NDE
shield (6) taking care not to place it aslant. Remove the shield
by sliding it along the shaft.
- Put the dismantled components to one side and recover the
preloading washer (59), which should be replaced in its
housing.
11.4.2 - Dismantling the DE shield
- Dismantle the DE shield without removing the rotor (3). To do
this:
- Remove the fixing screws (270) from the DE shield (5).
- Remove the fixing screws (40) from the DE internal cover
(33).
- Take out the key (21).
- Using two levers or a flexible hammer, disengage the DE
shield (5) taking care not to place it aslant.
- Remove the shield by sliding it along the shaft.
11.4.3 - Changing the antifriction bearings
- Using an appropriate lifting tool, take out the rotor without
knocking the winding.
- Take off the DE circlip (38).
- Remove the bearings (30) and (50) with an appropriate tool,
protecting the end of the shaft extension. Avoid knocking the
running surfaces of the shaft.
- Change the bearings in accordance with the instructions
described in the General information in section 6 (shrinkfitting
only).
IMPORTANT :
Before undertaking any of these procedures,
read the
«CHECKS BEFORE REASSEMBLY» section
.
11.4.4 - Reassembly
- Mount the DE bearing (30) on the rotor shaft (take care not to
forget the inner bearing retainer (33) and the circlip (38)!), and
also the NDE bearing (50) if and only if the stator inner Ø allows
the inner NDE bearing retainer (53) to pass through.
- Insert the rotor into the stator taking care not to knock the
winding. Install the NDE bearing if this has not already been
done.
- Fill the decompression grooves (416) located in the shaftway
with grease.
- Present the shields, grease nipples facing upwards. Begin
with the DE shield (5). Fix a dowel pin in one of the inner bearing
retainer (33) tapped holes
so that the grease inlet pipes fully
correspond.
- End with the NDE shield (6). Fix a dowel pin in one of the
inner bearing retainer (53) tapped holes
so that the grease
inlet pipes fully correspond.
- Lift the rotor slightly and fit the shields in place.
From now on, we recommend checking at every step that
the rotor turns freely by hand before continuing to the next
instruction.
- Replace the shield fixing screws (270) and (273).
- Insert the fixing screws on the inner bearing retainers (33) and
(53). Replace the AZ washers to ensure a perfect seal.
- Replace the fan key if appropriate.
- Replace the fan (7).
- Replace the shaft extension screw if necessary.
- Replace the cover (13) and reinsert the fixing screws (27).
- Lubricate the DE and NDE antifriction bearings, turning the
shaft by hand.
Amount of grease for ball bearings:
- Frame size 225 - 250: DE and NDE = 120 cm
3
- Frame size 280: DE = 170 cm
3
/ NDE = 120 cm
3
50
53
33
5
6
416
50
53
33
5
6
416
FLS/FLSES 225 M to 280
standard bearings
NDE
DE
FLS/FLSES 225 M to 280
drive end roller bearings
NDE
DE
