200 mm
140 mm
X2
X1 Z2 E+ E- 0V 110 220 380
Z1
T1
T2
T3
T4
T5
T6
5+
6-
T7
T8
T9
T10
T11
T12
R 438
F1
ST5
P5
ST11
ST2
ST1
P3
P2
ST4
ST9
AREP
PMG
PMG
T.I.
S1
P1
Ph.1
P2
S2
R731
50Hz
60Hz
ST10
13 %
LAM
25 %
P1
2010.11 / f
3971 en -
This manual is to be given to
the end user
R438
A.V.R.
Installation and maintenance
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2
LEROY-SOMER
2010.11 / f
Installation and maintenance
R438
A.V.R.
3971 en -
Before using your machine for the first time,
it is important to read the whole of this instal-
lation and maintenance manual.
All necessary operations and interventions
on this machine must be performed by a
qualified technician.
Our technical support service will be pleased
to provide any additional infor-mation you
may require.
The various operations described in this
manual are accompanied by recommen-da-
tions or symbols to alert the user to potential
risks of accidents. It is vital that you unders-
tand and take notice of the following warning
symbols.
This A.V.R. can be incorporated in a ma-
chine marked C.E.
Warning symbol for an operation ca-
pable of damaging or destroying the ma-
chine or surround-ing equipment.
Warning symbol for general danger to
personnel.
Warning symbol for electrical danger to
personnel.
Note: LEROY-SOMER reserves the right to
modify the characteristics of its products at
any time in order to incorporate the latest tech-
nological developments. The information
contained in this document may therefore be
changed without notice.
WARNING
This manual concerns the alternator A.V.R. which you have just purchased.
We wish to draw your attention to the contents of this maintenance manual. By following
certain important points during installation, use and servicing of your A.V.R., you can
look forward to many years of trouble-free operation.
SAFETY MEASURES
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LEROY-SOMER
3
2010.11 / f
Installation and maintenance
R438
A.V.R.
3971 en -
CONTENTS
1 - SUPPLY ..............................................................................................................................4
1.1 - AREP excitation system ...............................................................................................4
1.2 - PMG excitation system .................................................................................................5
1.3 - SHUNT or separate excitation system ..........................................................................5
2 - R438 A.V.R. ........................................................................................................................6
2.1 - Characteristics .............................................................................................................6
2.2 - Frequency compared with voltage (without LAM) .........................................................6
2.3 - LAM (Load Acceptance Module) characteristics...........................................................6
2.4 - Typical effects of the LAM with a diesel engine with or without a LAM (U/F only) ..........7
2.5 - R438 A.V.R. options .....................................................................................................7
3 - INSTALLATION - COMMISSIONING .................................................................................8
3.1 - Electrical checks on the AVR ........................................................................................8
3.2 - Settings ........................................................................................................................8
3.3 - Electrical faults ........................................................................................................... 11
4 - SPARE PARTS .................................................................................................................12
4.1 - Designation ................................................................................................................12
4.2 - Technical support service ...........................................................................................12
All such operations performed on the A.V.R. should be undertaken by personnel trained
in the commissioning, servicing and maintenance of electrical and mechanical
components.
The R438 is an IP00 product. It must be installed inside a unit so that this unit’s cover can
provide IP20 minimum total protection (it must only be installed on LS alternators in the ap-
propriate location so that when viewed externally, it has a higher degree of protection than
IP20).
Copyright 2005 : MOTEURS LEROY-SOMER
This document is the property of :
MOTEURS LEROY-SOMER
It may not be reproduced in any form without prior authorization.
All brands and models have been registered and patents applied for.
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4
LEROY-SOMER
2010.11 / f
Installation and maintenance
R438
A.V.R.
1 - SUPPLY
1.1 - AREP excitation system
For both AREP & PMG excitation systems,
the alternator voltage regulator is the R438.
With AREP excitation, the R438 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 propor-
tion to the stator current (compound charac-
teristic: Booster effect).
The power supply voltage is rectified and
filtered before being used by the AVR moni-
toring transistor. This principle ensures that
regulation is not affected by distortions ge-
nerated by the load.
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
Varistor
5+
6-
T7
T8
T9
T10
T11
T12
R 438
F1
ST5
P5
ST11
ST2
ST1
P3
P2
P1
ST4
ST9
Option
AREP
PMG
PMG
T.I.
Option
S1
P1
Ph.1
P2
S2
R731
Option
AREP SYSTEM
Field
Armature
10 Yellow
11 Red
9 Green
12 Black
MAIN FIELD
Aux. windings
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
3971 en -
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