6
2010.10 / i
LeRoY-SoMeR
3 - INSTALLATION
Personnel undertaking the various operations discussed
in this section must wear the appropriate personal
protective equipment for mechanical and electrical
hazards.
3.1 - Assembly
All mechanical handling operations must be undertaken
using approved equipment and the machine must be
horizontal. Check how much the alternator weight (see
4.9) before choosing the lifting tool. During this operation,
do not allow anyone to stand under the load.
3.1.1 - Handling
The generously-sized lifting rings are for handling the alternator
alone. They must not be used to lift the genset. The choice of
lifting hooks or handles should be determined by the shape of
these rings. Choose a lifting system that has regard for the
integrity and environment of the alternator.
3.1.2 - Coupling
3.1.2.1 - Single-bearing alternator
Before coupling the alternator and the heat engine, check they
are compatible by:
- undertaking a torsional analysis of the transmission on both
units
- checking the dimensions of the ywheel and its housing, the
ange, coupling discs and offset.
CAUTION
When coupling the alternator to the prime mover, the holes
of the coupling discs should be aligned with the ywheel
holes by cranking the engine.
Do not use the alternator fan to turn the rotor.
Make sure the alternator is securely bedded in position
during coupling.
Tighten the coupling disc screws to the recommended torque
and check that there is lateral play on the crankshaft.
3.1.2.2 - Two-bearing alternator
- Semi-exible coupling
Careful alignment of the alternator and the heat engine is
recommended, checking that the differences in concentricity
and parallelism of the two parts of the coupling do not exceed
0.1 mm.
CAUTION
This alternator has been balanced with a half-key.
3.1.3 - Location
Ensure that the ambient temperature in the room where the
alternator is placed cannot exceed 40 °C for standard power
ratings (for temperatures > 40 °C, apply a derating coefcient).
Fresh air, free from damp and dust, must be able to circulate
freely around the air intake grilles on the opposite side from the
coupling.
3.2 - Inspection prior to îš¿rst use
3.2.1 - Electrical checks
Under no circumstances should an alternator, new or
otherwise, be operated if the insulation is less than
1 megohm for the stator and 100,000 ohms for the other
windings.
There are three possible methods for restoring the above
minimum values.
a) Dry out the machine for 24 hours in a drying oven at a
temperature of approximately 110 °C (without the AVR).
b) Blow hot air into the air inlet, having made sure that the
machine is rotating with the exciter îš¿eld disconnected.
c) Run in short-circuit mode (disconnect the AVR):
- Short-circuit the three output terminals (power) using
connections capable of supporting the rated current (try not to
exceed 6 A/ mm
2
)
- Insert a clamp ammeter to monitor the current passing through
the short-circuit connections
- Connect a 48 Volt battery in series with a rheostat of
approximately 10 ohms (50 W) to the exciter îš¿eld terminals,
respecting the polarity
- Open all the alternator openings fully
- Run the alternator at its rated speed, and adjust the exciter
îš¿eld current using the rheostat to obtain the rated output current
in the short-circuit connections
Note: Prolonged standstill: In order to avoid these problems,
we recommend the use of space heaters, as well as turning
over the machine from time to time. Space heaters are only
really effective if they are working continuously while the
machine is stopped.
CAUTION
Ensure that the alternator has the degree of protection
matching the deîš¿ned environmental conditions.
INSTALLATION AND MAINTENANCE
LSA 43.2 / 44.2 - 4-poLe
ALTeRNAToRS
3434 en -
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