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LEROY-SOMER
2.2 - PMG excitation system
With PMG excitation, a permanent magnet
generator (PMG) added to the alternator
supplies the AVR with voltage which is
independent of the main alternator winding.
This is fitted at the rear of the machine and
connected to the R 448 AVR, and the ST9
PMG SYSTEM
PMG
5+
14 15 16
F1
Slow fuse
250V 10 A
ST5
with LAM without LAM
ST3
Frequency
50Hz
ST10
LAM
13 %
25 %
P5
Excitation
ceiling
ST11
open
knee-point: 65 Hz
ST2
Response
time
P3
Stability
6
Installation and maintenance
R448 & R448 V50
Armature
6-
Field
X2
Z1
60Hz
normal
ST6
fast
A.V.R.
jumper must be disconnected.
These two principles provide the machine
with a short-circuit current capacity of 3 IN
for 10 s, and good immunity to distortions
generated by the load.
The AVR monitors and corrects the
alternator output voltage by adjusting the
excitation current.
MAIN FIELD
X1 Z2 E+ E- 0V 110 220 380
R 448
ST1
46.2/47.2
49.1
Single-
No ST6 jumper
phase
for R448 V50
detection
3972 en - 05.2008 / e
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
(175 x 115 mm)
P1
ST9
AREP/SHUNT
T.I.
S2
S1
ST4
Option
External potentiometer
for adjusting the voltage
R731
3-ph. detection
in 3-ph. detection ST1 open
P2
Voltage
T8
T3
T9
T11
T6
T12
Quad
droop
PMG
P2
Option
Ph.1
P1
Option
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