The air-cooled alternator takes air in through filters;
leads the air through the alternator by means of a
built-in ventilator and out of the alternator again.
The water-cooled alternator circulates air internally
in the alternator by means of the ventilator. The air-
flow passes through a built-in water cooler, remov-
ing the heat from the alternator through the connec-
ted cooling water system.
The entrance to the electrical main cables can be
placed on the right or left side of the alternator with
a horizontal or vertical inlet.
Electrical alternator design
The alternator is a three-phase AC synchronous
alternator – brushless with built-in exciter and auto-
matic, electronic voltage regulator (AVR) with poten-
tiometer for remote control. (The potentiometer for
final adjustment of the voltage is included in the
standard delivery and normally part of the control
panel).
The alternator is intended for parallel running.
The insulation class for the windings can be H/H or
lower. H/H corresponds to 180° C on the windings
and 180° C operating temperature.
According to the GL classification rules the alterna-
tor must as maximum be used up to 155° C oper-
ating temperature – corresponding to insulation
class F. It may also be a customer requirement to
keep the efficiency below class H.
The windings have tropical resistance against high
humidity.
The alternator is equipped with anti-condensate
standstill heater.
For temperature surveillance in the windings, the
alternator is equipped with 2x3 PT100 sensors
(PT1000 sensors for engines with SaCoSone).
PT100/PT1000 sensors are also installed for sur-
veillance of the bearing temperature and for water
cooled alternators for surveillance of cooling air
temperature. Alternators may also be equipped with
visual thermometers on bearings.
The alternator can be delivered for the voltages 380
VAC to 13.8 KVAC. The frequencies are 50 Hz or
60 Hz.
The alternator fulfils the requirements for electro-
magnetic compatibility protection EMC, is designed
and tested according to IEC34 and fulfils the DIN
EN 60034 / VDE0530 requirements.
MAN Diesel & Turbo
B 50 00 0
Alternators for GenSets
1699895-2.1
Page 2 (2)
L27/38S, L21/31S, L16/24S, L16/24, L21/31, L27/38
2015.11.27
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