6
Installation and maintenance
LSRPM - PLSRPM
Synchronous permanent magnet motors
LEROY-SOMER
4155 en - 2012.05 / e
1.2 - Storage
Prior to commissioning, machines must be stored:
- protected from humidity: at relative humidity levels above
90%, the machine insulation can drop very rapidly, to just
above zero at around 100%. The state of the anti-rust protec-
tion on unpainted parts should be monitored.
For prolonged storage longer than 3 months, place the machine
in a sealed waterproof covering (for example heatshrunk
plastic) containing sachets of desiccant corresponding to the
volume and the degree of humidity of the location:
- Protected from frequent significant variations in temperature,
to avoid the risk of condensation. During storage the drain
plugs must be removed to allow condensation water to escape.
This location must be dry and protected from harsh weather
conditions, cold (temperature between – 15°C and + 80°C),
frequent temperature variations (to prevent the risk of conden-
sation), and free from vibration, dust and corrosive gases.
- If the area is subject to vibration, try to reduce the effect of this
vibration by placing the motor on a damping support (rubber
plate or similar).
Turn the rotor a fraction of a turn once a fortnight to prevent the
bearing rings from becoming marked.
- Do not remove the rotor locking device (where there are roller
bearings).
Even if the motor has been stored in the correct conditions,
certain checks must be carried out before it is started up:
Greasing
Bearings which cannot be regreased
Maximum storage: 3 years. After this time, replace the bearings
(see section 6.3)
.
Bearings which can be regreased
Grease
grade 2
Grease
grade 3
St
or
ag
e
pe
rio
d
less than
6 months
less than
1 year
The motor can be commissioned
without regreasing
more than
6 months
less than
1 year
more than 1
year
less than
2 years
Regrease before commissioning, as
described in section 3.1
more than
1 year
less than
5 years
more than
2 years
less than
5 years
Dismantle the bearing
- Clean it
- Replace the grease
completely
more than
5 years
more than
5 years
Change the bearing
- Regrease it completely
Greases used by LEROY-SOMER : POLYREX EM 103
2 - ASSEMBLY AND COMMISSIONING
RECOMMENDATIONS
2.1 - Checking the insulation
This check is essential if the motor has been stored for longer
than 6 months or if it has been kept in a damp atmosphere.
This measurement must be carried out using a megohmmeter
at 500 V DC (do not use a magnetoelectric system). It is better
to carry out an initial test at 30 or 50 volts and if the insulation
is greater than 1 megohm, carry out a second test at 500 volts
for 60 seconds. The insulation value must be at least 10
megohms in cold state.
If this value cannot be achieved, or if the motor may have been
splashed with water or salt spray, or kept for a long period in a
very humid place or if it is covered with condensation, it is ad-
visable to dry the stator for 24 hours in a drying oven at a tem-
perature of between 110°C and 120°C.
If it is not possible to place the motor in a drying oven:
- Switch on the motor, with the rotor locked, at 3-phase AC
voltage reduced to approximately 10% of the rated voltage, for
12 hours (use an induction regulator or a reduction transformer
with adjustable outlets).
Or supply the 3 phases in series with a DC current, with the
voltage at 1 to 2% of the rated voltage (use a DC generator with
independent excitation or batteries for motors of less than
22 kW).
- NB: The AC current must be monitored using a clamp ammeter,
and the DC current using a shunt ammeter. This current must
not exceed 60% of the rated current. It is advisable to place a
thermometer on the motor housing:
if the temperature exceeds 70°C, reduce the indicated voltage
or current by 5% of the original value for every 10° difference.
While it is drying, all the motor orifices must be open (terminal
box, drain holes).
In all cases, compatibility of the motor and its
environment must be guaranteed before its installation
and also throughout its life.
Electric motors are industrial products.
They must therefore be installed by
qualified, experienced and authorised personnel. The
safety of people, animals and property must be ensured
when fitting the motors into machines (please refer to
current standards.
Before starting the motor, it is advisable to
check the insulation between the phases and
earth, and between phases.
M
Warning: If the high voltage test which was carried
out at the factory before despatch needs to be
repeated, it should be performed at half the standard
voltage, i.e.: 1/2 (2U + 1 000V). Check that the capacitive
effect resulting from the high voltage test is eliminated
before connecting the terminals to earth.
