Installation and maintenance
R448 & R448 V50
A.V.R.
3972 en - 02.2008 / d
LEROY-SOMER
5
2 - SUPPLY
2.1 - AREP excitation system
For both AREP & PMG excitation systems,
the alternator voltage regulator is the R
448.
With AREP excitation, the R 448 electronic
AVR is powered by two auxiliary windings
which are independent of the voltage
match circuit.
The first winding has a voltage in proportion
to that of the alternator (characteristic
Shunt), the second has a voltage in
proportion to the stator current (compound
characteristic: Booster effect).
The power supply voltage is rectified and
filtered before being used by the AVR
monitoring transistor.
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
AREP 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
according voltage
10 Yellow
11 Red
9 Green
12 Black
Aux. windings
STATOR : 6 wires (marked T1 to T6)
STATOR : 12 wires (marked T1 to T12)
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
R731
Option
ST4
Option
T.I.
Option
S1
P1
Ph.1
P2
S2
Voltage
Single-
phase
detection
External potentiometer
for adjusting the voltage
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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