LEROY-SOMER
5
2010.11 / f
Installation and maintenance
R438
A.V.R.
1.2 - PMG excitation system
This excitation system consists of a «PMG»
(permanent magnet generator). This is îš¿tted
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
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.
4 x holes Ø 5.8 x
175 x 115 mm
200 mm
140 mm
X2
X1
Z2
E+
E-
0V
110
220
380
Z1
T1
T2 T3
T4
T5
T6
V a r i s t o r
5+
6-
T7
T8 T9
T10
T11
R 438
F1
ST5
P5
ST11
ST2
ST1
P3
P2
P1
ST4
ST9
Option
AREP
PMG
14 15 16
PMG
T.I.
Option
S1
P1
Ph.1
P2
S2
R731
Option
PMG SYSTEM
Field
Armature
MAIN FIELD
Slow fuse
250V 8 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
Quad
droop
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
ST3
50Hz
60Hz
ST10
13 %
LAM
25 %
Frequency
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).
3971 en -
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