18
INSTALLATION AND MAINTENANCE
LSA 46.2 / 47.1 - 4 POLE
ALTERNATORS
SERVICING - MAINTENANCE
Ref. 2981 GB - 4.33/b - 07.02
LEROY-SOMER
4.6.3 - Access to diodes
- Open the air inlet louvre (51)
- Disconnect the diodes.
- Check the diodes using an ohmmeter or a battery lamp (see
section 4-5)
If the diodes are faulty
- Remove the surge suppressor (347).
- Remove the 6 "H" mounting nuts for the diode bridges on the
support.
- Change the crescents, respecting the polarity.
4.6.4 - Access to connections and the
regulation system
Access directly by removing the box lid (48) or the AVR
access door (466).
4.6.5 - Replacing the NDE bearing on single
bearing machines
- Remove the box lid (48) and the NDE panel (365) and
remove the 2 screws from the part (122).
- Disconnect the stator outputs (T1 to T12).
- Disconnect the auxiliary winding wires with AREP
(X1,X2,Z1,Z2).
- Disconnect the exciter wires (5+,6-).
- Remove the air inlet louvre (51)
- Remove the 2 bearing thrust screws (78).
- Remove all 4 screws (37).
- Remove the bearing (36).
- Remove the ball bearing (70) using a puller with a central
screw (see drawing below).
- Check the condition of the "O" ring seal (349) and, if
necessary, change it.
- Fit the new bearing, after heating it by induction to
approximately 80°C.
When dismantling the machine, always change the
bearings.
4.6.6 - Replacing the DE bearing on
two-bearing machines
- Remove the screws (31) and (62).
- Remove the shield (30).
- Remove the circlips (284).
- Remove the ball bearing (60) using a puller with a central
screw.
- Fit the new bearing, after heating it by induction to
approximately 80°C.
When dismantling the machine, always change the
bearings.
4.6.7 - Complete dismantling
- Remove the DE shield (30) as described in section 4.6.6.
- Support the DE rotor (4) with a strap or a support
constructed as shown in the drawing below.
- Remove the NDE shield bearing cover.
- Tap the shaft end lightly on the opposite side from the
coupling using a small mallet.
- Pull the strap in order to move the rotor and ensure its weight
is evenly supported.
- Remove the NDE shield following the instructions in section
4.6.5.
4.6.8 - Reassembling the end shields
- Place the “O” ring seal (349) and the preloading wavy
washer (79) in the bearing seat (36).
- Position shields (30) and (36) on the stator (1).
- Tighten screws (31) and (37).
- Reconnect all the exciter wires, auxiliary windings, stator,
etc.
- Fit the 2 support screws (122).
- Fit the air inlet louvre (51)
- Replace the cover.
4.6.9 - Reassembling the rotor
On single bearing machines :
- Mount the rotor (4) in the stator (1) (see drawing below)
- Check that the machine is correctly assembled and that all
screws are tightened.
On two-bearing machines :
- Mount the rotor (4) in the stator (1).
- Position shield (30) on the stator (1).
- Tighten screws (31).
- Mount the inner bearing retainer (68) using the screws (62).
WARNING
ARNING
WARNING
ARNING
