7
LEROY-SOMER
2011.03 / a
Installation and maintenance
LSA VS 40
ALTERNATORS
4779 en -
3.2 - Checks 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 several 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 AVR, the rectifier and the CCM).
b) Blow hot air into the air inlet, 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.
3.2.2 - Mechanical checks
Before starting the machine for the first time,
check that:
- All fixing bolts and screws are tight
- The cooling air is drawn in freely
- The protective guards 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)
3.2.2 - Connection checks
Electrical installations must comply with
the current legislation in force in the
country of use.
Check that:
- The residual circuit-breaker, in compliance
with the legislation on protection of personnel
in force in the country of use, has been
correctly installed on the alternator power
output as close as possible to the alternator.
(In this case, disconnect the wire from the
interference suppression module linking the
neutral).
- Any protection devices in place have not
been tripped.
- If there is an external AVR, the connections
between the alternator and the cabinet are
made in accordance with the connection
diagram.
- There is no short-circuit between phase or
phase-neutral between the alternator output
terminals and the genset control cabinet
(part of the circuit not protected by circuit-
breakers or relays in the cabinet).
- The machine has been connected with the
busbar separating the terminals as shown in
the terminal connection diagram.
The PTO placed under the heatsink must
be connected to the genset safety system
(contact characteristics : 240 V max - 10A
on resistance)
WARNING
WARNING