4531 en - 2010.

10 / c

VOIR NOTICE
VOLT. STAB. I EXC LEDS FUSIBLES / FUSES SEE NOTICE

US
EXT.FREQ. 50Hz LAM

C
LAM SET. 0 OFF
ON 9 LAM
1 MODE 1
50 Hz EXT FREQ

LAM 8 90 1
60 Hz SETTING

2 LAM
OFF MODE 2

X2
23
78
ONLY FOR LAM
SPECIAL 7
4 56 3 OFF
CONFIG. LAM
4

Z1
MODE 1
KNEE
5 6 LAM
65Hz
LAM OFF 60Hz
MODE 2

E+ Z2 X1
1 PHASE SENSING
SERIES SERIES
LSA 49.1/50.2
3 0 LSA 46.2/47.2
7000/8000 3 5000/6000

Installation and maintenance

0
1
SERIES
2 SERIES
LSA 49.1/50.2 LSA 46.2/47.2

E-
7000/8000 2 1 5000/6000
3 PAHASES SENSING

380V 220 110 0V

SHUNT / AREP
RAPIDE 3 0 NORMAL
FAST NORMAL
3

0
R 450

1
2
RAPIDE NORMAL
FAST 2 1 NORMAL
PMG

r 450
3PH. 1k
S1 S2
STAT. Installation & maintenance manual :
www.leroy-somer.com

AVRs
n to ive
be g
er
man e end us
s t o
ual i
This t h
 LEROY-SOMER Installation and maintenance 4531 en - 2010.10 / c

r 450
AVRs

This manual concerns the alternator AVR 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 AVR, you can look
forward to many years of trouble-free operation.

SAFETY MEASURES

Before using your machine for the first time, WARNING

it is important to read the whole of this
installation and maintenance manual.

All necessary operations and interventions Warning symbol for an operation capable
on this machine must be performed by a of damaging or destroying the machine
qualified technician.
or surrounding equipment.
Our technical support service will be pleased
to provide any additional information you
may require.

The various interventions described in

this manual are accompanied by
recommendations or symbols to alert the
user to potential risks of accidents. It is vital Warning symbol for general danger to
that you understand and take notice of the personnel.
various warning symbols used.

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 technological developments. The
information contained in this document may
therefore be changed without notice.

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AVRs

CONTENTS

1 - GENERAL INFORMATION ................................................................................................4

1.1 - Description.................................................................................................................... 4
1.2 - Characteristic................................................................................................................ 4

2 - POWER SUPPLY................................................................................................................ 5
2.1 - AREP excitation system................................................................................................5
2.2 - PMG excitation system..................................................................................................6
2.3 - SHUNT or separate excitation system...........................................................................7

3 - TECHNICAL CHARACTERISTICS.....................................................................................8
3.1 - Electrical characteristics................................................................................................8
3.2 - Configurations............................................................................................................... 8
3.3 - U/F and LAM functions................................................................................................12
3.4 - Typical effects of the LAM with a diesel engine with or without a LAM (U/F only)......... 12
3.5 - AVR options . .............................................................................................................. 13

4 - INSTALLATION - COMMISSIONING................................................................................14
4.1 - Electrical checks on the AVR.......................................................................................14
4.2 - Setting up.................................................................................................................... 14
4.3 - Electrical faults............................................................................................................ 17

5 - SPARE PARTS.................................................................................................................. 18
5.1 - Designation................................................................................................................. 18
5.2 - Technical support service............................................................................................18

All servicing or repair operations performed on the AVR should be undertaken by

personnel trained in the commissioning, servicing and maintenance of electrical and
mechanical components.

Copyright 2005: LEROY-SOMER MOTORS

This document is the property of:
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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 LEROY-SOMER Installation and maintenance 4531 en - 2010.10 / c

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AVRs

1 - GENERAL INFORMATION 1.2 - Characteristic

1.1 - Description The connection is realised by “Faston”
connectors and the voltage sensing is
The R450 AVR is supplied in a casing single - phase.
designed to be mounted on a panel with
dampers.
- Operating temperature: - 30°C to + 65° C.
- Storage temperature: - 55°C to + 85°C.
- Shocks on the base: 9 g depending on the
3 axes.
- Vibrations: less than 10 Hz, 2 mm
half-peak amplitude 10 Hz to 100 Hz: 100
mm/s, above 100 Hz: 8 g.

WARNING
The AVR is IP00, it must be incorporated
in an environment which ensures it a
IP20 protection.

140 mm

4 holes Ø 6.5 mm 115 mm

R 450 50 Hz EXT FREQ

60 Hz SETTING

P1 Voltage

Rotating switch
VOLT.
LSA 49.1 /50.2

LSA 49.1 /50.2

ONLY FOR
65Hz

SPECIAL
CONFIG.

EXT.FREQ.
7000 /8000 2

7000 /8000

LAM OFF
RAPIDE

RAPIDE 3

LAM

LAM
OFF

P2
VOLTAGE 320V ~ 530V

KNEE

ON
FAST 2

FAST

VOLTAGE 80V ~ 320V

SERIES

SERIES

- Lam and U/F Stability

SHUNT / AREP

SET.

- Voltage
9
3

78
3PH.

STAB. I EXC
PMG

- Excitation
2

3
3

4 56
90 1

0 0
5

0
50Hz
60Hz

1 1 23
1k

1 5000/6000
0 NORMAL

0 LSA 46.2/47.2
1 NORMAL

1
LSA 46.2/47.2
NORMAL

NORMAL

3
2
5000/6000
SERIES

SERIES

MODE 1

MODE 1
MODE 2

MODE 2
LAM

LAM
LAM

LAM
LAM

LAM
OFF

OFF
S1

P3
S2

Excitation
200 mm

175 mm

STAT.

LEDS

Overrun
P4 indications
Installation & maintenance manual :
www.leroy-somer.com

Quad
FUSIBLES / FUSES

droop
Fuses 10A
SEE NOTICE
VOIR NOTICE

380V 220 110 0V E- E+ Z2 X1 Z1 X2 C US

4
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AVRs

2 - POWER SUPPLY characteristic), the second one has a

Both the SHUNT/AREP & PMG excitation voltage proportional to the stator current
systems are controlled by the AVR. (compound characteristic : Booster effect).
The power supply voltage is rectified and
2.1 - AREP excitation system filtered before being used by the AVR
With AREP excitation, the electronic AVR is monitoring transistor.
powered by two auxiliary windings which This system provides the machine with a
are independent of the voltage sensing short-circuit current capacity of 3 IN for 10 s.
circuit. The rotating switch should be in the AREP
The first winding has a voltage proportional position (see 3.2.3).
to the alternator main voltage (Shunt
STATOR : 6 wires ( T1 to T6)
MAIN FIELD STATOR : 12 wires ( T1 to T12)
AREP SYSTEM Aux. windings
T1 T7 T2 T8 T3 T9
Varistor

Armature
5+ 6-
T4 T10 T5 T11 T6 T12
10 Yellow

9 Green
12 Black

Field
11 Red

R 450 50 Hz EXT FREQ

60 Hz SETTING
VOLT.
LSA 49.1 /50.2

LSA 49.1 /50.2

ONLY FOR
65Hz

SPECIAL
CONFIG.

EXT.FREQ.
7000 /8000 2

7000 /8000

LAM OFF
RAPIDE

RAPIDE 3

LAM

LAM SET.
OFF
KNEE

ON
FAST 2

FAST

SERIES

SERIES
SHUNT / AREP

8
9
3

78
3PH.

STAB. I EXC
PMG

2
2

3
3

4 56
90 1

0 0
5

0
50Hz
60Hz

1 1 23
1k

1 5000/6000
0 NORMAL

0 LSA 46.2/47.2
1 NORMAL

1
LSA 46.2/47.2
NORMAL

NORMAL

3
2
5000/6000
SERIES

SERIES

MODE 1

MODE 1
MODE 2

MODE 2
LAM

LAM
LAM

LAM
LAM

LAM
OFF

OFF
S1
S2
STAT.

LEDS
Installation & maintenance manual :
www.leroy-somer.com

FUSIBLES / FUSES
SEE NOTICE
VOIR NOTICE

380V 220 110 0V E- E+ Z2 X1 Z1 X2 C US

according to voltage 10 Yellow

11 Red
12 Black
9 Green

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AVRs

2.2 - PMG excitation system The AVR monitors the alternator output
With PMG excitation, a permanent magnet voltage by adjusting the excitation current.
generator (PMG) added to the alternator The rotating switch should be in the PMG
supplies the AVR with voltage which is position (see 3.2.3).
independent of the main alternator winding.
This system provides the machine with a
short-circuit current capacity of 3 IN for 10 s.

STATOR : 6 wires ( T1 to T6)

MAIN FIELD STATOR : 12 wires ( T1 to T12)
PMG SYSTEM
T1 T7 T2 T8 T3 T9
Armature
Varistor

PMG

Field
5+ 6-
T4 T10 T5 T11 T6 T12

16
R 450 50 Hz EXT FREQ
60 Hz SETTING
15
14
VOLT.
LSA 49.1 /50.2

LSA 49.1 /50.2

ONLY FOR
65Hz

SPECIAL
CONFIG.

EXT.FREQ.
7000 /8000 2

7000 /8000

LAM OFF
RAPIDE

RAPIDE 3

LAM

LAM
OFF
KNEE

ON
FAST 2

FAST

SERIES

SERIES
SHUNT / AREP

SET.
9
3

78
3PH.

STAB. I EXC
PMG

2
2

3
3

4 56
90 1

0 0
5

0
50Hz
60Hz

1 1 23
1k

1 5000/6000
0 NORMAL

0 LSA 46.2/47.2
1 NORMAL

1
LSA 46.2/47.2
NORMAL

NORMAL

3
2
5000/6000
SERIES

SERIES

MODE 1

MODE 1
MODE 2

MODE 2
LAM

LAM
LAM

LAM
LAM

LAM
OFF

OFF
S1
S2
STAT.

LEDS
Installation & maintenance manual :
www.leroy-somer.com

FUSIBLES / FUSES
SEE NOTICE
VOIR NOTICE

380V 220 110 0V E- E+ Z2 X1 Z1 X2 C US

according to voltage

16
15
14

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 LEROY-SOMER Installation and maintenance 4531 en - 2010.10 / c

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AVRs

2.3 - SHUNT or separate excitation

system
With SHUNT excitation, the AVR is powered
by the main winding (100V to 140V -
50/60 Hz ) by using X1, X2 on the AVR.
The rotating switch should be in the SHUNT/
AREP position (see 3.2.3).

STATOR : 6 wires ( T1 to T6)

MAIN FIELD STATOR : 12 wires ( T1 to T12)
SHUNT SYSTEM
T1 T7 T2 T8 T3 T9
Armature
Varistor

Field
5+ 6-
T4 T10 T5 T11 T6 T12

R 450 50 Hz EXT FREQ

60 Hz SETTING
VOLT.
LSA 49.1 /50.2

LSA 49.1 /50.2

ONLY FOR
65Hz

SPECIAL
CONFIG.

EXT.FREQ.
7000 /8000 2

7000 /8000

LAM OFF
RAPIDE

RAPIDE 3

LAM

LAM
OFF
KNEE

ON
FAST 2

FAST

SERIES

SERIES
SHUNT / AREP

SET.
9
3

78
3PH.

STAB. I EXC
PMG

2
2

3
3

4 56
90 1

0 0
5

0
50Hz
60Hz

1 1 23
1k

1 5000/6000
0 NORMAL

0 LSA 46.2/47.2
1 NORMAL

1
LSA 46.2/47.2
NORMAL

NORMAL

3
2
5000/6000
SERIES

SERIES

MODE 1

MODE 1
MODE 2

MODE 2
LAM

LAM
LAM

LAM
LAM

LAM
OFF

OFF
S1
S2
STAT.

LEDS
Installation & maintenance manual :
www.leroy-somer.com

FUSIBLES / FUSES
SEE NOTICE
VOIR NOTICE

380V 220 110 0V E- E+ Z2 X1 Z1 X2 C US

X1
X2

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AVRs

3 - TECHNICAL CHARACTERISTICS 3.2.1.2 - Quadrature droop:

Quadrature droop adjustment via
3.1 - Electrical characteristics
potentiometer P4 within a range :
- maximum power supply: 150V - 50/60 Hz - from 0 to 8% with a PF=0.8 for 400V
- Rated overload current: 10 A - 10 s applications.
- Electronic protection: - From 0 to 14% with a PF=0.8 for 240V
- In the case of a short-circuit, the excitation applications.
current is reduced to a value less than 1A - From 0 to 8% for 110V applications with a
after 10 s step-up transformer (ratio of 4) placed on
- In the event of loss of voltage reference, the voltage reference.
the excitation current is reduced to a value The potentiometer P4 has a non linear
less than 1A after 1s for AREP/SHUNT, 10 s response. Then, when a 1A secondary CT is
for PMG. connected the effective range starts from
- In the event of overexcitation, the current the the second 1/3 of P4 range and in the
is reduced as indicated in the next diagram case of a 5A secondary CT the effective
(see 3.2.1.4). range starts from the first 1/3.
- Fuses: F1 on X1 and F2 on Z2 10A, 250V. When a 5A CT is used, the adjustment range
- Voltage sensing is higher, so P4 must be set to the first 1/4
• 0-110 V terminals = 95 to 140 V (anti-clockwise) and then progressively
• 0-220 V terminals = 170 to 260 V increase it.
• 0-380 V terminals = 340 to 528 V
For other voltages, a transformer should be WARNING
used. The CT must be connected.
- Voltage regulation:± 0.5%.
- Current sensing: (parallel operation): input 3.2.1.3 - Stability:
S1, S2 intended for 1 C.T. < 2.5 VA cl1, Stability adjustment via potentiometer P2.
secondary 1 A or 5 A. Selection of rotating switch according to the
machine type and the response time as
indicated in paragraph 3.2.3.
3.2 - Configurations:
3.2.1 - Settings 3.2.1.4 - Excitation limitation:
3.2.1.1 - Voltage Excitation limitation adjustment via
Voltage adjustment via potentiometer P1 in potentiometer P3 as described below.
the ranges described in the table below: The excitation current limitation threshold in
steady state is set by a potentiometer at
For 50 and 60 Hz Max. 110% of the rated value. The adjustment is
High range 320V < Un ≤ 530 V made by the operator during the on-load test
Low range 80 V ≤ Un ≤ 320 V at rated power by tuning the potentiometer.
When the excitation current exceeds this
value, a counter is activated at the speed of
WARNING one record per second for 90 s. When this
The allowed adjustment range is ±5%; time is elapsed, the current is reduced to the
when the setting exceeds these limits, value of the rated excitation current. If in the
please check that it is conform with the meantime the excitation current drops
power table. below the threshold value, the counter
counts down at the same speed.

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 LEROY-SOMER Installation and maintenance 4531 en - 2010.10 / c

r 450
AVRs
excitation current must be limited to
WARNING 9 A ± 0.5 A.

The limitation threshold must be Overrun indications:

adjustable between 1 and 5.5 A. The
genset breaker must be open during the One green LED:
short circuit. If the genset is restarted in - Lights up when the excitation current is
short circuit, there is a excitation build below the continuous operation threshold
up during 10s again at the maximum It signals the AVR normal operation.
value. - Turns off when the excitation current ceiling
used to obtain short-circuit operation is
Operation between 3 and 6 In when reached and when the excitation current is
short-circuited: reduced to the shutdown value.
The excitation current ceiling during a - Flashes when the over excitation counter
short-circuit equals 2.9 times the fixed is decrementing.
threshold when setting the permitted NB: After an obvious short-circuit, the
excitation ceiling in continuous operation. voltage is limited to 70% of the rated voltage.
When the threshold is exceeded for a period This avoids overvoltages on machines
= 10 s the current is reduced to a value whose no-load excitation current is below
between 0.5 and 0.7 A (shutdown). the “lower current” threshold (only in AREP).
In all operating conditions the maximum

I exc(A)
Diagram 1
2.9x I threshold 9.5
(Maximum current I exc)
(max. 9.5 A)

P3

I threshold
(1...5.5A)
t(s)
Shutdown Activation of
Activation of
0.5 ~ 0.7 90 s tempo. Decrease of
Activation of 10 s tempo. 10s tempo. elapsed :
90 s tempo.
90 s tempo. shutdown apllication

Red led
Green led

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 LEROY-SOMER Installation and maintenance 4531 en - 2010.10 / c

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AVRs

I exc(A)
Diagram 2
2.9x I threshold (Maximum current I exc)
(max. 9.5 A) 9.5

P3

I threshold
(1...5.5A)
t(s)
Shutdown
Activation of 90 s. tempo elapsed : application
0.5 ~ 0.7 90 s. tempo of permanent limitation

Red led
Green led

One red LED:

- Lights up simultaneously with the green led
when the continuous operation threshold is WARNING
reached for more than 90 s and the excitation If the overload protection is activated, a
current is reduced to the continuous voltage drop possibly exceeding 10% of
operation threshold. It is used to set the the reference voltage will be observed.
excitation current ceiling
- Turns off when the excitation current is less The AVR does not provide undervoltage
than the setting value (< 110% In) protection. The customer will need to
- Flashes when the excitation current is make sure that their installation is
above the continuous operation threshold correctly protected against under-
during less than 90 s. voltages.

During load shedding, an overvoltage is

Green LED stays on, observed, which will disappear in a few
- flashes when the excitation current has seconds.
reached the ceiling in < 10s with PMG
excitation.
- ftays on if Iexc = I Shutdown.

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AVRs

3.2.2 - Rotating switch selection: LAM 3.2.3 Rotating switch: excitation type
and U/F and time response
EXT.FREQ. 50Hz LAM
LAM SET.
ON 9
0
1
OFF
LAM
AREP
MODE 1 RAPIDE 3 0 NORMAL
LAM 8 901 2 LAM
OFF
23
MODE 2 FAST NORMAL
78

LAM
3

0
ONLY FOR 3
7 OFF
456
SPECIAL
CONFIG. LAM

1
4
2
KNEE 6
MODE 1 RAPIDE NORMAL
5 LAM
1 NORMAL
65Hz 60Hz
MODE 2 FAST 2
LAM OFF
PMG
- Pos 0: Change in the voltage according to
0: AREP excitation and normal time
the U/F ratio, knee-point position at 48 Hz.
response.
- Pos 1: Change in the voltage according to
the 2U/F, knee-point position at 48 Hz. 3: AREP excitation and fast time response.
- Pos 2: Change in the voltage according to 1: PMG excitation and normal time response.
the self auto-adaptating LAM combined with 2: PMG excitation and fast time response.
2U/F, knee-point position at 48 Hz.
- Pos 3: Change in the voltage according to For SHUNT applications, AREP excitation
the U/F ratio, knee-point position at 58 Hz must be selected.
- Pos 4: Change in the voltage according to
the 2U/F, knee-point position at 58 Hz.
- Pos 5: Change in the voltage according to 3.2.4 Rotating switch: voltage sensing
the self auto-adaptating LAM combined with
2U/F, knee-point position at 58 Hz. 1 PHASE SENSING
- Pos 6: Change in the voltage according to SERIES
LSA 49.1/50.2
3
SERIES
0 LSA 46.2/47.2
the U/F ratio, knee-point position at 65 Hz 7000/8000 3 5000/6000
0

(Tractelec application and variable speed

1

SERIES SERIES
2
above 1800 rpm). LSA 49.1/50.2 LSA 46.2/47.2
7000/8000 2 1 5000/6000
- Pos 7: Special (not used). ONLY WITH
EXTERNAL R731 MODULE

- Pos 8: Change in the voltage according to 3 PHASES SENSING

the U/F ratio, knee-point position at 48 Hz or 0: Single phase sensing
58 Hz according to selection of the frequency - LSA46.2/47.2 series.
by an external contact.
- Pos 9: Change in the voltage according to 3: Single phase sensing
LAM 1, knee-point position at 48 Hz or 58 Hz - LSA49.1/50.2 series.
according to selection of the frequency by
an external contact 1: Three-phase sensing with optional
module R731
- LSA46.2/47.2 series.
WARNING
2: Three-phase sensing with optional
For Pavers and hydraulic applications, module R731
select positions 0 (50 Hz) or 3 (60 Hz). - LSA49.1/50.2 series.

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AVRs

3.3 - U/F and LAM function 3.3.2.2 - Soft voltage recovery function
3.3.1 - Frequency variation compared During load impacts, the function helps the
with voltage (without LAM) genset to return to its rated speed faster with
a gradual increase in voltage according to
Voltage Bend 57.5 Hz
the principle:
48 Hz - If the speed drops between 46 and 50 Hz
100 %
U/UN
(in 50Hz operation), the rated voltage is
50 Hz
60 Hz recovered by following a fast gradient.
- If the speed drops below 46 Hz, since the
engine needs more help, the voltage follows
Frequency a slow gradient as it returns to the reference
50 Hz 60 Hz
Hz value.

3.3.2 - LAM (Load Acceptance Module)

characteristics U

3.3.2.1 - Voltage drop Drop N 46 Hz

The LAM system is integrated in the AVR. As Drop N > 46 Hz

Time
standard it is active. 0
Role of the LAM:
On application of a load, the genset rotation
speed decreases. When it falls below the 3.4 - Typical effects of the LAM with
preset frequency threshold, the LAM causes a diesel engine with or without a
the voltage to drop proportionately to the LAM (U/F only)
frequency (LAM1) or to the active power
(LAM2) depending the the rotating switch
position. This reduces the active load scale 3.4.1 - Voltage
applied until the speed returns to its rated Transient voltage drop
UN
value.
Hence the LAM can be used either to reduce
the speed variation (frequency) and its 0,9

duration for a given applied load, or to (U/f)

without LAM
increase the applied load possible for one 0,8
with
LAM
Time
speed variation (turbo-charged engine).
To avoid voltage oscillations, the trip 0 1s 2s 3s

threshold for the LAM function should be set

approximately 2 Hz below the rated 3.4.2 - Frequency
frequency.
Max. speed drop with

Voltage
fN LAM

Voltage
UN
0,9
without
U/f LAM
0,8 Time
0,85 UN LAM
0 1s 2s 3s

48 or 58 Hz 50 or 60 Hz
0 fC
ST3 fN

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AVRs

3.4.3 - Power - R729 module: same as R726 with

additional functions.
LAM • Detection of a diode fault.
• 4-20 mA input.
Load on the

• Possibility of kVAR regulation.

shaft (kW)

Variation in the load

Load shedding due to LAM - Voltage control: with an isolated

D.C. current source applied to the terminals
Time
0 1s 2s 3s used for the external potentiometer:
• Internal impedance 1.5 kΩ.
• A variation of ± 0.5 V corresponds to a
3.5 - AVR options voltage adjustment of ± 10%.
- Current transformer for parallel opera-
tion of....../1 A or 5 A according to the po-
tentiometer P4 position.

- Voltage transformer (adaptation)

- Remote voltage adjustment potentio­

meter: 1 k Ω, 0.5 W min: adjustment range
± 5% (range limited by internal voltage
potentiometer P1). (A 470 Ω potentiometer
can also be used to extend the adjustment
range).

The potentiometer input must be

isolated. Do not connect it to the ground.

- R 731 module : 3-phase voltage sensing

200 to 500 V, compatible with parallel
operation in balanced installations.

- R 734 module : 3-phase current and

voltage sensing for parallel operation on
unbalanced installations (unbalance >
15%).

- R 726 module: regulation system

changed to “4 - function” (see the
maintenance manual and connection
diagram).
• PF regulation (2F) .
• Equalization of voltages before
paralleling (3 F).
• Possibility of coupling to the mains of
alternators already running in parallel (4F).

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AVRs

4-INSTALLATION-COMMISSIONING
Action Factory setting Pot.
4.1 - Electrical checks on the AVR
Voltage
- Check that all connections have been minimum fully 400 V - 50 Hz
anti-clockwise P1
made properly as shown in the attached
wiring diagram. Not set
Stability P2
- Check the rotating switches selections (centre position)
- frequency,
Excitation ceiling 10 A
- type of alternator, - Factory-sealed maximum P3
- normal position (response time),
- external potentiometer, Voltage quadrature droop
Not set
(// operation with C.T.)
- rated voltage, - 0 quadrature droop fully (fully
P4
anti-clockwise)
- secondary current of the CT used, anti-clockwise

- type of excitation.
- R450 optional operating modes Stability adjustments in standalone
operation
4.2 - Setting up b) Install a D.C. analogue voltmeter (needle
dial) cal. 100 V on terminals F+, F- and an
A.C. voltmeter cal. 300 - 500 or 1000 V on
the alternator output terminals.

c) Check the rotating switch selection.

The various adjustments during tests d) Voltage potentiometer P1 at minimum,
must be made by a qualified engineer. It fully anti-clockwise.
is essential that the drive speed
specified on the nameplate is reached e) Stability potentiometer P2 around 1/3 in
before commencing adjustment. After from the anti-clockwise stop.
operational testing, replace all access f) Start the engine and set its speed to a
panels or covers. frequency of 48 Hz for 50 Hz, or 58 for
60 Hz.
The AVR is used to make any
adjustments to the machine. g) Set the output voltage to the desired
value using P1.
- Rated voltage UN for solo operation
4.2.1 - Setting up the R450 (eg. 400 V)
Before using the AVR, make sure that - Or UN + 2 to 4% for parallel operation with
the rotating switches have been C.T. (eg. 410 V -)
correctly configured with AREP/SHUNT If the voltage oscillates, use P2 to make
adjustments (try both directions), observing
or PMG excitation
the voltage between F+ and F- (approx.
10 V D.C.). The best response time is
obtained at the limit of the instability. If no
stable position can be obtained, try selecting
the fast position.

a) Initial potentiometer settings (see table h) Check LAM operation: depending on the
below) rotating switch selection.

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i) Vary the frequency (speed) around 48 or However, for applications requiring an
58 Hz according to the operating frequency, overload protection (see 3.2.1.4), the
and check the change in voltage from that excitation ceiling must be adjusted by using
observed previously (~ 15%). the following procedures in AREP and PMG.
j) Readjust the speed of the genset to its
Method 1 :
rated no-load value.
-Connect the AVR to the alternator
Adjustments in parallel operation -apply load to 110% of rated machine rated
Before starting work on the alternator, make at PF=0.8, the green led is on and the red
sure that the speed droop is identical for all one is off.
engines. -record the excitation current value
-adjust P3 until obtaining the red led flashing,
k) Preset for parallel operation (with C.T. the green one is always on.
connected to S1, S2) -decrease the load to 100% and make sure
- Potentiometer P4 (quadrature droop) in that the red led is off.
1/4 position in the case of 5A CT and at 1/2 - Increase the load at 115%, check that the
position in the case of 1A CT. red LED flashes during 90 seconds and that
Apply the rated load (PF = 0.8 inductive). the excitation current is brought back to the
The voltage should drop by 2 to 3% (400 V). above adjusted value (Iex adjusted).
If it increases, check that neither V and W
nor S1 and S2 have been reversed. Method 2 :
The rated excitation current (see machine
l) The no-load voltages should be identical plate) must be multiplied by 1.1 and the
for all the alternators intended to run in obtained value is used to set the
parallel. potentiometer P3 at the right position.
- Couple the machines in parallel. The following table must be used.
- By adjusting the speed, try to obtain 0 kW Position of I exc (A)
power exchange. P3
- By altering the voltage setting P1 on one of
the machines, try to cancel (or minimise) the 8h 1
current circulating between the machines. 9h 1.55
- From now on, do not touch the voltage
settings. 10h 1.95
11h 2.5 12H
m) Apply the available load (the setting is
only correct if a reactive load is available) 12h 3.15
- By altering the speed, match the kW (or 13h 3.65
divide the rated power of the units 8H 16H
14h 4.25
P3
proportionally)
- By altering the quadrature droop 15h 4.7
potentiometer P4, match or divide the 16h 5.15
currents.
NB: In the case of a permanent short-circuit,
4.2.2 - Max. excitation adjustment
(excitation ceiling) the excitation current must reach 2.9 x Iex
adjusted (limited to 9.5A), during 1 second
In standard setting, the potentiometer P3 is
in AREP or 10 seconds in PMG and shuts
in maximum position. down to a value less than 1A.

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The exciter is switched off by disconnecting
the AVR power supply (1 wire on each
auxiliary winding) - contact rating 16 A -
250 V A.C.
When the excitation current is set to the Connection is identical for resetting the AVR
rated value, a voltage dip is observed in internal protection.
excitation current limit when the
limitation is activated and the current
limit is reached.

4.2.3 - Special type of use If field weakening is used, provide field

forcing.
WARNING
4.2.3.3 - R450 field forcing
The excitation circuit F+, F- must not be
left open when the machine is running: (400V - 10A) Diode
this will irreparably damage the AVR. X2
Z1 t - +
X1 Battery (B Volt)
4.2.3.1 - R450 (SHUNT) field weakening Z2
E+
X2 E-
Z1 Exciter field winding

X1 Field forcing
B Volt
Z2
t
E+
E- Time

Applications B Volt Time t

The exciter is switched off by disconnecting
the AVR power supply (1 wire - X1 or X2) Guaranteed voltage build-up 12 (1A) 1-2s
Contact rating: 16 A - 250 V A.C. Parallel operation, de-energized 12 (1A) 1-2s

Parallel operation, at standstill 12 (1A) 5 - 10 s

4.2.3.2 - R450 (AREP/PMG) field
weakening Frequency starting 12 (1A) 5 - 10 s

Sustained voltage on overload 12 (1A) 5 - 10 s

X2
Z1
X1
Z2
E+
E-

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4.3 - Electrical faults

Fault Action Measurements Check/Cause
The alternator builds up and its - Lack of residual magnetism
voltage is still correct when the
battery is removed
No voltage at Connect a new battery The alternator builds up but its - Check the connection of the voltage
no load on of 4 to 12 V to terminals voltage does not reach the rated reference to the AVR
start-up F- and F+, respecting value when the battery is removed - Faulty diodes
the polarity, for 2 to 3 - Armature short-circuit
seconds
The alternator builds up but its - Faulty AVR
voltage disappears when the - Field windings disconnected
battery is removed - Revolving field coil open circuit. Check the
resistance
- Check the AVR connections and settings
(AVR faulty)
Correct speed - Field windings short-circuited
Voltage too Check the drive speed - Rotating diodes burnt out
low - Revolving field coil short-circuited
- Check the resistance
Increase the drive speed
Speed too low (Do not touch the AVR voltage pot. (P1)
before running at the correct speed)

Voltage too Adjust AVR voltage Adjustment ineffective - Faulty AVR

high potentiometer - 1 faulty diode

Voltage Adjust AVR stability If no effect: try normal/fast - Check the speed: possibility of cyclic
oscillations potentiometer recovery modes irregularity
- Loose connections
- Faulty AVR
- Speed too low when on load
(or U/F knee-point set too high)
Voltage between F+ and F- - Check the speed
Voltage Run at no load and AREP/PMG < 10 V (or U/F knee-point set too high)
correct at no check the voltage Voltage between F+ and F- - Faulty rotating diodes
load and too between F+ and F- on AREP/PMG > 15 V - Short-circuit in the revolving field coil.
low when on the AVR Check the resistance
load (*) - Faulty exciter armature
(*) Caution: For single-phase operation, check that the sensing wires coming from the AVR are correctly connected to
the operating terminals.
Voltage Check the AVR, the The voltage does not return to the - Exciter winding open circuit
disappears surge suppressor, the rated value - Faulty exciter armature
during rotating diodes, and - Faulty AVR
operation (**) replace any defective - Revolving field coil open circuit or
components short-circuited
- Overload (see LED)
(**) Caution: Internal protection may be activated (overload, open circuit, short-circuit)

Caution: After operational testing or

troubleshooting, replace all access
panels or covers.

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5 - SPARE PARTS
5.1 - Designation
Description Type Code
Voltage regulator R 450 AEM 110 RE 031
(AVR)

5.2 - Technical support service

Our technical support service will be pleased to
provide any additional information you may
require.

When ordering spare parts, you should indicate

the AVR type and code number.

Address your enquiry to your usual contact.

Our extensive network of service centres can

dispatch the necessary parts without delay.
To ensure correct operation and the safety of our
machines, we recommend the use of original
manufacturer spare parts.
In the event of failure to comply with this advice,
the manufacturer cannot be held responsible for
any damage.

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