Electric Power Generation
Installation and maintenance
LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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8
Generator set: Class G2.5
Turbine: Class G1
The shaft end is cold-stamped to indicate the type of
balancing (as per ISO8221)
H: balancing with Half-key carried out as
standard
F: balancing with Full key (upon request)
N: balancing without key (upon request)
The balancing is carried out in two planes.
The first is on the fan. It is recommended, when the fan is
refitted (after servicing) to follow the initial indexing.
The second is at the rear of the machine.
The coupling must be balanced to adapt to the generator
rotor balancing.
2.3 TERMINAL BOX
2.3.0 Description (on damper buffers)
Use the attached Terminal box drawing.
The openings provide access to the terminals.
The gland plates are made of non-magnetic materials in
order to avoid circulating currents.
If accessories not supplied by Leroy-Somer have to be
installed in the terminal box (CT’s, VT’s, Shunt, etc.) refer
to chapter.3.4.3.
In order to limit the level of vibration of the accessories
contained in the terminal box, the terminal box is mounted
on rubber damper pads.
CAUTION:
RUBBER DAMPERS MUST BE CHECKED
PERIODICALLY AND REPLACED EVERY FIVE YEARS.
2.3.1 Automatic voltage regulator (AVR)
When the automatic voltage regulator is located in the
terminal box, it is fitted on a separate plate, insulated from
vibration by means of dampers. The operation of the
regulator is explained in Section 3.
2.4 NAMEPLATES
2.4.1. Main nameplate
The main nameplate is fitted to the stator. It gives the
manufacturer's electrical characteristics, the type of
machine and its serial number. The serial number is
necessary for any contact with the factory.
For machines with anti-friction bearings lubrication
parameters are indicated.
2.4.2. Lubrication nameplate
The machines with anti-friction bearings have the
lubrication parameters indicated on the main nameplate
fixed on the stator, indicating:
• Type of bearing
• Grease change frequency
• Amount of grease
• Grease type
2.4.3. Rotation direction nameplate
Located on the stator an arrow indicates the direction of
rotation.
2.5 ROLLER-BEARING
2.5.0 Description of roller-bearings
The bearings ensure the guiding of rotor rotation and its
axial positioning.
The bearings are protected from ambient dust by baffles.
They can be replaced.
The bearings must be lubricated regularly. The old grease
is forced out at the lower part of the bearings by the force
of the new grease being injected.
2.5.1 Bearing protection devices
Optionally, the bearing can be equipped with RTD sensors
to detect possible heating.
For special use in warm surroundings where the
temperature of the bearings exceeds the authorised limit
(for a bearing known to be in good condition), contact us.
Bearing; Alarm points and shutdown:
• alarm 90°C (194°F)
• shutdown 95°C (203°F)
To improve the machine protection we recommend to set
the alarm point following effective site conditions:
Alarm temperature (*) = Highest recorded temp + 15°K
(*) do not exceed the values of the previous table.
E.g. On-site, the normal temperature of the bearing is
60°C. Set the alarm temperature to 75°C instead of the
90°C shown in the previous table.
NOTE:
Specific dedicated devices based on the analysis of the
vibration signal are able to monitor bearings behaviour.
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