Pmg Excitation System; Shunt Or Separate Excitation System - Leroy-Somer R438 Installation And Maintenance Manual

LEROY-SOMER

1.2 - PMG excitation system

This excitation system consists of a «PMG»
(permanent magnet generator). This is fitted
at the rear of the machine and connected to
the R438 AVR.
The PMG supplies the AVR with constant
voltage which is independent of the main
PMG
14 15 16
Slow fuse
F1
250V 8 A
ST5
with LAM without LAM
ST3
50Hz
Frequency
ST10
LAM
13 %
Excitation
P5
ceiling
ST11
knee-point: 65 Hz
ST2 Response
time
P3
Stability

1.3 - SHUNT or separate excitation system

A.V.R. can be operated with SHUNT supply (with a transformer / secondary 50V or a 48V battery).
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Installation and maintenance
PMG SYSTEM
Armature
5+
6-
Field
X2 Z1
60Hz
25 %
open
normal
fast
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R438
A.V.R.
alternator winding. As a result the machine
has a short-circuit current capacity and
good immunity to distortions generated by
the load.
The AVR monitors and corrects the alterna-
tor output voltage by adjusting the excitation
current.
- 50/60 Hz selection via the ST3 jumper.
MAIN FIELD
according voltage
X1 Z2 E+ E- 0V 110 220 380
R 438
ST1
P2
Voltage
Single-
phase
detection
3971 en - 2010.11 / f
STATOR : 6 wires (marked T1 to T6)
STATOR : 12 wires (marked T1 to T12)
T1 T7 T2 T8
T5 T11
T4 T10
140 mm
4 x holes Ø 5.8 x
175 x 115 mm
Quad
P1
droop
AREP
ST9
PMG
T.I. P2
S2
Option
Ph.1
S1
P1
ST4
Option
External potentiometer
for adjusting the voltage
Option
R731
3-ph. detection
in 3-ph. detection ST1 open
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T3 T9
T6 T12
5
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