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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 SYSTEM
PMG
5+
14 15 16
Slow fuse
F1
250V 8 A
ST5
with LAM without LAM
ST3
Frequency
50Hz
60Hz
LAM 13 %
ST10
LAM 25 %
Excitation
P5
ceiling
open
ST11
knee-point: 65 Hz
Response
ST2
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).
Installation and maintenance
Armature
6-
Field
X2
Z1
normal
fast
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
alternator output voltage by adjusting the
excitation current.
- 50/60 Hz selection via the ST3 jumper.
MAIN FIELD
X1 Z2 E+ E- 0V 110 220 380
R 438
ST1
P2
Voltage
Single-
phase
detection
3971 en - 11.2006 / c
STATOR : 6 wires (marked T1 to T6)
STATOR : 12 wires (marked T1 to T12)
T7
T1
T2
T5
T4
T10
according voltage
140 mm
4 x holes Ø 5.8 x
175 x 115 mm
Quad
P1
droop
AREP
ST9
PMG
T.I.
P2
S2
Option
S1
P1
ST4
Option
External potentiometer
for adjusting the voltage
Option
R731
3-ph. detection
in 3-ph. detection ST1 open
T8
T3
T9
T11
T6
T12
Ph.1
5
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