6
INSTALLATION AND MAINTENANCE
LSA R 49.1 Air/air heat exchanger
ALTERNATORS - Ex II 3 G
INSTALLATION
4081 en - 09.2006 / a
LEROY-SOMER
3 - INSTALLATION
3.1 - Assembly
All mechanical handling operations must be undertaken
using approved equipment.
Whilst being handled, the machine should remain
horizontal.
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
Two-bearing alternator
- Semi-flexible coupling
Careful alignment of the machines is recommended,
checking that the concentricity and parallelism of both parts
of the coupling do not exceed 0.1 mm.
This alternator has been balanced with a 1/2 key.
3.1.3 - Location
The machine must only be used in the environmental
conditions which are defined when ordering
.
Warning : the ambient temperature cannot exceed 50˚C.
. 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. 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 insulation 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) .
- With the machine stopped, 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 12 Volt battery to the exciter field terminals,
respecting the polarity, in series with a rheostat for adjusting
the resistance in order to obtain an excitation current equal to
the rated stator current (eg : 10
Ω
/50W),
- 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