2020.05 / f
6
Electric Power Generation
Installation and maintenance
LSA R/H 49.1
Low Voltage Alternator - 4 pole
4528 en -
3 - INSTALLATION
3.1 - Assembly
All mechanical handling operations
must be undertaken using approved
equipment.
Whilst being handled, the machine
should remain horizontal.
• 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.
• Double-bearing coupling
- Semi-flexible coupling
Careful alignment of the machines is
recommended, checking that the lack of
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.
• Location
The machine must only be used in the
environmental conditions which are defined
when ordering.
LSA R only:
Warning : the ambient temperature can-
not 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 coupl-
ing. It is essential to prevent not only the re-
cycling of hot air from the machine or engine,
but also exhaust fumes.
3.2 - Checks prior to first use
• 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 2 possible methods for restoring
the above minimum values.
a) Dry out the machine for 24 hours in a
drying oven at a temperature of 110 °C
(without the regulator).
b) Blow hot air into the air intake, having
made sure that the machine is rotating with
the exciter field disconnected.
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.
Ensure that the alternator has the degree
of protection matching the defined
environmental conditions.
• Mechanical checks
Before starting the machine for the first time,
check that:
- all fixing screws are tight,
- the length of screw and the tightening
torque are correct,
- the cooling air is drawn in freely,
- the protective grilles and housing are cor-
rectly in place,
- the standard direction of rotation is clock-
wise 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
