6
INSTALLATION
LEROY-SOMER
3 - INSTALLATION
3.1 - Assembly
All mechanical handling operations must be undertaken
using approved equipment.
The machine should remain horizontal during handling.
3.1.1 - Handling
The generously-sized lifting rings are for handling the
alternator alone. They must not be used to lift the genset.
Choose a lifting system which respects the positioning of the
rings.
3.1.2 - Coupling
3.1.2.1 - single bearing alternator
Before coupling the two machines, check that both are
compatible by :
- undertaking a torsional analysis of the transmission
- checking the dimensions of the flywheel and its housing, the
flange, coupling discs and offset
When coupling the alternator to the prime mover, the
holes of the coupling discs should be aligned with the
flywheel holes by rotating the primary pulley on the
thermal engine.
Do not use the alternator fan to turn the rotor.
Tighten the coupling disc screws to the recommended torque
(see section 4.6.2.) and check that there is lateral play on the
crankshaft.
3.1.2.2 - two-bearing alternator
- Semi-flexible coupling
Careful alignment of the machines is recommended, by
checking that any differences in the concentricity and
parallelism of both parts of the coupling does not exceed 0.1 mm.
This alternator has been balanced with a 1/2 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
coefficient). Fresh air, free from damp and dust, must be able
to circulate freely around the air intake grille on the opposite
side from the coupling. It is essential to prevent not only the
recycling of hot air from the machine or engine, but also
exhaust fumes.
3.2 - Inspection prior to first use
3.2.1 - Electrical checks
Under no circumstances should an alternator, new or
otherwise, be operated if the isolation is less than 1
megohm for the stator and 100,000 ohms for the other
windings.
There are three possible methods for restoring these
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 intake, having made sure that the
machine is rotating with the exciter field disconnected.
c) Run in short-circuit mode (disconnect the AVR) :
- Short-circuit the three output power terminals using
connections capable of supporting the rated current (try not to
exceed 6 A/mm2).
- Insert a clamp ammeter to monitor the current passing
through the short-circuit connections.
- Connect a 24 Volt battery in series with a rheostat of
approximately 10 ohms (50 W) to the exciter field terminals,
respecting the polarity.
- Open fully all the alternator openings.
- Run the alternator at its rated speed, and adjust the exciter
field 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.
3.2.2 - Mechanical checks
Before starting the machine for the first time, check that :
- all fixing bolts and screws are tight
- cooling air is drawn in freely
- the protective grilles and housing are correctly in place
- the standard direction of rotation is clockwise as seen from
the shaft end (phase rotation in order 1 - 2 - 3).
For anti-clockwise rotation, swap 2 and 3.
- the winding connection corresponds to the site operating
voltage (see section 3.3)
WARNING
WARNING
WARNING
WARNING
