2021.06 / o
5
Electric Power Generation
Installation and maintenance
LSA 42.3
Low Voltage Alternator - 4 pole
4803 en -
2 - TECHNICAL
CHARACTERISTICS
2.1 - Electrical characteristics
This alternator is a machine without
sliprings or revolving armature brushes,
wound as “2/3 pitch”
,
4 or 12-wire
, with
class H insulation and a field excitation
system available in either SHUNT, AREP or
PMG version (see diagrams and AVR
manuals).
• Electrical options
- Stator temperature detection sensors
- Space heaters
- R791 interference suppression
2.2 - Mechanical characteristics
- Steel frame
- Aluminum end shields
- Protected ball bearings, greased for life
- Mounting arrangement: single bearing
with standard feet and SAE flanges/
coupling discs, two-bearing with SAE flange
and standard cylindrical shaft extension
- Drip-proof machine, self-cooled
- Degree of protection: IP 23
• Mechanical options
- Direct output power by cables (not
reconnectable)
, regulator fitted outside the
alternator
- Protection against harsh environments
- Air inlet filter, air outlet filter
Alternators fitted with air inlet filters are
subject to a power derating of 5%.
To prevent excessive temperature rise
caused by clogged filters, it is advisable to fit
the stator winding with thermal sensors
(PTC).
• SHUNT dedicated single-phase 4-wire
Varistor
R221
T1
T2
T3
T4
STATOR: 4-wire (marking T1 to T4)
MAIN FIELD
Power supply /
Detection
EXCITER
Field
Armature
