12
LEROY-SOMER
2011.03 / a
Installation and maintenance
LSA VS 40
ALTERNATORS
4779 en -
4.6.3 - Access to connections and the
regulation system
The terminals and AVR are accessed
directly by removing the terminal box lid
[41].
4.6.4 - Accessing, checking and replacing
the diode bridge
4.6.4.1 - Dismantling
- Remove the terminal box lid [144].
- Cut the fixing clamps on the exciter cables,
disconnect E+, E- from the exciter.
- Remove the 4 nuts on the tie rods.
- Remove the NDE shield [36] using a puller:
eg. U.32 - 350 (Facom).
- Unsolder the connections.
- Check the bridge using an ohmmeter or a
battery lamp (see section 4.5.1.).
4.6.4.2 - Reassembly
- Replace the bridges, respecting the
polarity (see section 4.5.1.).
- Resolder the connections.
- Fit a new O ring seal in the shield.
- Refit the NDE shield and pass the bundle
of wires between the top bars of the shield.
- Replace the fixing clamps on the cables.
- Replace the terminal box lid [48]
4.6.5 - Replacing the NDE bearing on
single-bearing machines
4.6.5.1 - Dismantling
- Remove the NDE shield [36] (see section
4.6.4.1.)
- Remove the antifriction bearing [70] using
a screw puller.
4.6.5.2 - Reassembly
- Heat the inner slipring of a new bearing by
induction or in a drying oven at 80°C (do not
use an oil-bath) and fit it to the machine.
- Place the preloading wavy washer [79] in
the shield and fit a new O ring seal [349].
- Replace the NDE shield [36] (see section
4.6.4.2.).
4.6.7 - Accessing the revolving field coil
and stator
4.6.7.1 - Dismantling
Follow the procedure for dismantling the
bearings (see section 4.6.6).
- Remove the coupling disc (single-bearing
machine) or the DE end shield (two-bearing
machine) and insert a tube of the
corresponding diameter on the shaft
extension or a support made according to
the following diagram.
Rotor
NDE shield
M8 threaded rod
