Installation and maintenance
R448 & R448 V50
A.V.R.
6
3972 en - 02.2008 / d
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
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.
ST6
ST1
46.2/47.2
49.1
P2
No ST6 jumper
for R448 V50
4 x holes Ø 5.8
(175 x 115 mm)
200 mm
140 mm
X2
X1
Z2
E+
E-
0V
110
220
380
Z1
T1
T2 T3
T4
T5
T6
Varistor
5+
6-
T7
T8 T9
T10
T11
T12
R 448
F1
ST5
P5
ST11
ST2
P3
R731
Option
ST4
Option
T.I.
Option
S1
P1
Ph.1
P2
S2
14 15 16
PMG
PMG SYSTEM
Field
Armature
MAIN FIELD
Slow fuse
250V 10 A
with LAM
without LAM
Excitation
ceiling
knee-point: 65 Hz
open
Response
time
normal
fast
Stability
Voltage
Single-
phase
detection
External potentiometer
for adjusting the voltage
according voltage
STATOR : 6 wires (marked T1 to T6)
STATOR : 12 wires (marked T1 to T12)
in 3-ph. detection ST1 open
3-ph. detection
ST9
AREP/SHUNT
PMG
ST3
50Hz
60Hz
ST10
13 %
LAM
25 %
P1
Frequency
Quad
droop
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