Pmg Excitation System; Shunt Or Separate Excitation System - SDMO R33C3 User And Maintenance Manual

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
50Hz
Frequency
ST10
LAM
13 % 25 %
Excitation
P5
ceiling
ST11 open
knee-point: 65 Hz
ST2
Response
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
MAIN FIELD
Armature
6-
Field
X2 Z1
60Hz
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 alterna-
tor output voltage by adjusting the excitation
current.
- 50/60 Hz selection via the ST3 jumper.
X1 Z2 E+ E- 0V 110 220 380
R 438
ST1
P2
Voltage
Single-
phase
detection
231/242
3971 en -
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
Ph.1
S1
P1
ST4
Option
External potentiometer
for adjusting the voltage
Option
R731
3-ph. detection
in 3-ph. detection ST1 open
2010.11 / f
T8 T3 T9
T11
T6 T12
5