Leroy-Somer R452 Instruction Manual

This manual is to be given
to the end user
VOLTAGE REGULATOR R452
R 452 X2
Z1
X1
Z2
E+
E-
J1
+
-
t
(12V - 10A)
Exciter field
Isolated DC
power supply
~ 10 ohms
Installation and maintenance
Ref. 3563 GB - 4.33 / a - 01.02

2
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
LEROY-SOMER
Ref. 3563 GB - 4.33 / a - 01.02
WARNING
IN ORDER TO AVOID ANY HARM TO EITHER PERSONNEL OR
THE INSTALLATION, THIS DEVICE MUST ONLY BE SET UP BY
A QUALIFIED ENGINEER.
CAUTION
DO NOT USE HIGH-VOLTAGE MEASURING APPARATUS.
INCORRECT USE OF CERTAIN APPARATUS MAY LEAD TO
DESTRUCTION OF THE SEMICONDUCTORS INCLUDED IN
THE VOLTAGE REGULATOR.
NOTE
THE CONNECTION DIAGRAMS IN THIS MANUAL ARE
PROVIDED FOR INFORMATION ONLY. FOR ACTUAL
CONNECTION, SEE THE DIAGRAMS SUPPLIED WITH THE
ALTERNATOR.
CAUTION
1) WHILE THE ALTERNATOR IS AT A STANDSTILL, MAINS
VOLTAGE MAY REAPPEAR AT THE MODULE VOLTAGE
SENSING TERMINALS.
LETHAL DANGER
2) DO NOT PERFORM DIELECTRIC TESTS WITHOUT
DISCONNECTING THE MODULE AND ITS ASSOCIATED
VOLTAGE REGULATOR.
RISK OF DESTRUCTION

3
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
CONTENTS
LEROY-SOMER
Ref. 3563 GB - 4.33 / a - 01.02
1 - Presentation of the R 452 .................................................................................................................. 4
1.1 - Application ................................................................................................................................ 4
1.2 - Description ............................................................................................................................... 4
1.3 - Electrical characteristics............................................................................................................ 5
1.3.1 - Operating diagram ....................................................................................................... 5
1.3.2 - Sensing ........................................................................................................................ 6
1.3.3 - Voltage accuracy ......................................................................................................... 6
1.3.4 - Voltage setting ............................................................................................................. 6
1.3.5 - Power supply ............................................................................................................... 6
1.3.6 - Output power ............................................................................................................... 6
1.3.7 - Quadrature droop (1F) ................................................................................................. 6
1.3.8 - Frequency/Underspeed ............................................................................................... 6
1.3.9 - Stability ........................................................................................................................ 8
1.3.10 - Limiting the excitation current Iex .............................................................................. 8
1.3.11 - Protection ................................................................................................................... 8
1.3.12 - Voltage build-up ......................................................................................................... 8
1.3.13 - Power usage .............................................................................................................. 8
1.3.14 - De-energising ............................................................................................................ 8
1.4 - Environment ............................................................................................................................. 8
2 - R 726: Regulation of power factor (2F) and mains voltage sensing (3F) ...................................... 9
2.1 - Potentiometers ......................................................................................................................... 9
2.2 - Operating diagram ................................................................................................................. 10
3 - Typical diagrams .............................................................................................................................. 11
3.1 - AREP 1F LV excitation ........................................................................................................... 11
3.2 - AREP 1F MV excitation .......................................................................................................... 12
3.3 - AREP 3F LV excitation ........................................................................................................... 13
3.4 - AREP 3F MV excitation .......................................................................................................... 14
3.5 - 1F LV shunt + booster excitation ........................................................................................... 15
3.6 - 1F LV PMG excitation ............................................................................................................ 16
4 - Commissioning ................................................................................................................................. 17
4.1 - For standalone regulation ...................................................................................................... 17
4.2 - For 1F regulation (parallel operation between alternators) .................................................... 17
4.3 - For 2F regulation (regulation of power factor) and 3F regulation (voltage match circuit) ....... 17
5 - Troubleshooting ............................................................................................................................... 19
5.1 - Checking the windings and rotating diodes using a separate excitation ................................ 19
5.2 - Static checking of the regulator .............................................................................................. 19
5.3 - Troubleshooting table ............................................................................................................. 20
5.3.1 - For 1F regulation, parallel operation between alternators ........................................ 20
5.3.2 - For 2F and 3F ............................................................................................................ 22
5.3.3 - Checking the alternator using a separate excitation .................................................. 22
5.4 - Replacing the regulator with a spare voltage regulator .......................................................... 22

4
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
P
RESENTATION OF THE
R 452
LEROY-SOMER
Ref. 3563 GB - 4.33 / a - 01.02
1 - PRESENTATION OF THE R 452
1.1 - application
The R 452 regulator is of a shunt type. It is designed to fit as
standard on alternators from the LSA 46.2 to the LSA 54, and
is used to replace R 448 or R 449 AVRs for any application
with high load impacts, leading to load reconnection
difficulties for the generator set. It can be supplied with power
either by a power VT, or by the AREP excitation system, or by
a single-phase or 3-phase PMG.
Using the R 726 external module, the regulator can control
the power factor (2F) and can match the alternator voltage to
the mains voltage (3F).
1.2 - description
The electronic components mounted in a plastic casing are
sealed with opaque elastomer. Connection is via 2
connectors (male ''Faston'' lugs 6.3).
The regulator includes:
- A main terminal block (10 terminals) J1
- A secondary terminal block (5 terminals) J2
- A frequency selection terminal block (3 terminals) J3
- A droop potentiometer P1
- A voltage potentiometer P2
- A stability potentiometer - Integral P3
- An underspeed potentiometer P4
- A maximum excitation potentiometer P5
- A LAM potentiometer P6
- A kU/F potentiometer P7
- A stability potentiometer - (proportional) P8
- A stability potentiometer - (derivative) P9
- A sensing selection jumper ST1
(Single/3-phase with an external module)
- A response time jumper ST2
- A frequency selection jumper ST3
- An external voltage setting jumper ST4
- A LAM (load adjustment module) jumper ST5
Two fuses (F1 and F2) are connected to this regulator; they
are mounted in the alternator on terminal block C.
Type: gG 10/38 16A 500V.
Simplified diagram of a potentiometer:
To adjust the potentiometer, check the actual position of the
potentiometer stop.
5
0
10
Stop
ST3 50Hz 60Hz
4 x Ø5.8 x 175 x 115
200 x 140 mm
X2
X1
Z2
E+
E-
0V
110
220
380
Z1
L2(V)
L3
(W)
340-520V
170-260V
R452
P5
P2
P4
P3
ST2
ST5
R731
C.T.
ST4
ST4
Option
S1 S2
P1
ST1
normal
5+ 6 -
85-140V
Option
Option
Response
time
With LAM Without LAM
Single phase
detection
3-phase detection
Excitation
ceiling
Frequency
Under
speed
Stability
External potentiometer
for voltage adjustment
or for R 726 connection
Voltage
Quad. droop
Exciter field
Supply
Stability
(derivative)
Stability
(proportio.) P9
J2
J1
J3
P8
P6
LAM
P7
kU/F
rapid

5
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
P
RESENTATION OF THE
R 452
LEROY-SOMER
Ref. 3563 GB - 4.33 / a - 01.02
1.3 - electrical characteristics
1.3.1 - operating diagram

6
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
P
RESENTATION OF THE
R 452
LEROY-SOMER
Ref. 3563 GB - 4.33 / a - 01.02
1.3.2 - sensing
The sensing is single-phase and is isolated using an internal
transformer.
Sensing VA: 5VA
J1 connector, input voltages:
Terminals 0-110V voltage range from 85 to 130V
Terminals 0-220V voltage range from 170 to 260V
Terminals 0-380V voltage range from 340 to 520V
1.3.3 - voltage accuracy
The voltage accuracy is +/- 0,5%Un, steady state, linear load.
1.3.4 - voltage adjustment
The voltage is adjusted either using an internal potentiometer
P2, with a voltage range of +/- 10%Un, or using an external
potentiometer (as an option).
The voltage is minimum when internal potentiometer P2 has
been rotated fully anti-clockwise.
Connecting the external potentiometer:
External potentiometer 470W 3W: Voltage range +/- 5 %Un
External potentiometer 1kW 3W: Voltage range +/-10 %Un
Remove the ST4 jumper and connect the external
potentiometer as shown in the diagram below. If a regulator is
built into the terminal box, remove the ST10 jumper from
terminal block C and connect the external potentiometer.
1.3.5 - power supply
The power can be supplied:
using 2 independent auxiliary windings integrated in the
alternator stator (AREP excitation) or using a single or
3-phase power VT or using a single or 3-phase PMG.
The single or 3-phase voltage must not exceed 240V AC.
1.3.6 - output power
The output power is 7A 63V under normal conditions and 15A
for 10s under overload conditions.
1.3.7 - quadrature droop (1F)
Quadrature droop is achieved using a parallel operation CT
(In/1A, 10VA Cl1). The voltage dip can be adjusted using
potentiometer P1. The voltage range is 5%Un for Pn PF 0.8.
The quadrature droop is at 0 when potentiometer P1 has
been rotated fully anti-clockwise.
1.3.8 - frequency/underspeed
Definition of underspeed potentiometers:
- P4: setting the knee-point - P6: setting the LAM - P7: setting
the kU/F
Selection of underfrequency threshold using the ST3 jumper
U/F: Action threshold adjustable using potentiometer P4
To avoid voltage oscillations, the trip threshold of the "LAM"
function should be set approximately 2 Hz below the lowest
frequency in normal operation.
(Adjustable using potentiometer P4).
- Setting the kU/F: Potentiometer P7 is used for this purpose.
It can be used to adjust the underspeed slope from U/F to 3U/F.
LAM: When it leaves the factory, the regulator is configured
with the LAM activated.
It is disabled by disconnecting the ST5 jumper, and operation
is then the standard U/F.
- Role of the "LAM" (load adjustment module).
When a load is applied, the speed of rotation of the generator
set decreases. When it falls below the preset frequency
threshold, the "LAM" causes the voltage to drop by approximately
15 %. This in turn reduces the active load scale applied by
approximately 25 %, until the speed returns to its rated value.
The LAM can therefore either be used to reduce the speed
variation (frequency) and its duration for a given applied load,
or to increase the possible applied load for one speed
variation (turbo-charged engines).
Pour régler le LAM procéder comme indiqué ci-dessous :
- P6 (LAM) : position médiane (LAM # 10%)
- P7 (kU/F) : position médiane (2U/F)
Appliquer la charge, enregistrer la vitesse et la tension.
En fonction des résultats, agir d’abord sur :
- P7 (kU/F) : position système horaire (34/F)
Refaire l’essai d’application de la charge, si nécessaire, agir
ensuite sur :
- P6 (LAM) : 3/4 horaire (LAM = 15%)
Puis si nécessaire à nouveau sur :
- P6 (LAM) : position extrème horaire (LAM = 20%)
- Setting the LAM:
Potentiometer P6 is used for this purpose.
It can be used to adjust the LAM from 5 to 20 %Un.
P2
J2
ST4 J2 ST4
Rhe
Internal External
Voltage setting : ST4
P1
ST3
J3
ST3
J3
50 Hz 60 Hz
P4
5
0
10
U/F
3U/F
2U/F
5
0
10
5%Un
20%Un
10%Un
LAM
UN
0
48 or 58 Hz
0.85 UN
Frequency
Voltage
P2
P6
P4
P7
U/f
50 or 60 Hz
fC fN
Under frequency and LAM
Voltage
ST5 cut
ST3

7
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
P
RESENTATION OF THE
R 452
LEROY-SOMER
Ref. 3563 GB - 4.33 / a - 01.02
- Typical effects of a ''LAM'' with a diesel engine.
UN
0
0.9
0.8
(U/f)
LAM
Transient voltage dip
0.9
0.8
Speed drop
"LAM" action
∆ P Load step
Time (s)
123
Load on the shaft (kW)
fN
w/o LAM (U/F only) with Lam
LAM
LAM
Voltage
Frequency
Load

8
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
P
RESENTATION OF THE
R 452
LEROY-SOMER
Ref. 3563 GB - 4.33 / a - 01.02
1.3.9 - stability
Definition of stability potentiometers:
- P3: integrator
- P8: proportional
- P9: derivative
- Standard position potentiometer positions: 5
Setting the stability:
The stability is initially set on voltage build-up, with the
alternator at rated speed, de-energised.
At the start of the test, set all 3 potentiometers to 5.
Find the best position for P3:
Close the de-energisation contact and monitor the voltage
making (overvoltage and oscillation) on build-up.
De-energise the alternator (open the de-energisation contact).
Set P3 to a different position from 5 and repeat voltage build-up.
Repeat this test several times and select the position of P3
which produces the best voltage build-up, ie. without
overvoltage and without oscillations.
Retain this position for subsequent tests.
Find the best position for P8:
Perform the same tests as before.
Select the position of P8 which produces the best voltage build-up.
Retain this position for subsequent tests.
Find the best position for P9:
Perform the same tests as before.
Select the position of P9 which produces the best voltage build-up.
Then do a test with load impact (or load shedding) and
fine-tune the settings.
1.3.10 - limiting the excitation current iex
- Potentiometer P5 is used to adjust Iex limitation. Limitation
of the excitation current is active for 10s. After this period of
time, the excitation current is limited to 2A.
The maximum limitation is 15A.
The minimum limitation is when the potentiometer has been
rotated fully anti-clockwise.
In the absence of specification to the contrary, P5 is
positioned at the clockwise limit.
- Static adjustment of the max. excitation current.
For this value, the static adjustment is possible when the
alternator is stopped, which will not endanger the alternator or
the installation.
Disconnect power supply wires X1,X2 and Z1,Z2, and the
voltage reference from the alternator (terminal block J1).
Connect the mains power supply, 200 to 240V, as indicated
(X1 and X2): 0-220V). Install a 20A D.C. ammeter in series
with the exciter field.
Turn P5 fully anti-clockwise, switch on the power supply
(switch A).
If there is no output current from the AVR, turn potentiometer
P2 (voltage) clockwise until the ammeter indicates a
stabilised current.
Switch the power supply off and then on again, turn P5
clockwise until the required excitation current is reached
(limited to 15A), (for precise adjustment contact Leroy-Somer).
Checking the internal protection:
Open switch (D): the excitation current should increase to its
preset ceiling, remain at that level for 10s and then fall back
automatically to a value less than 2A.
To reset, switch off the power supply by opening switch (A).
Note: After setting the excitation ceiling using this procedure,
re-adjust the voltage.
1.3.11 - protection
There are two fuses in the power section. They are fitted
externally to the AVR but inside the alternator terminal box.
Rating: gG 10/38 16A 500V
1.3.12 - voltage build-up
The voltage build-up is automatic (no overvoltage) from the
residual magnetism.
If there is no voltage build-up, a short pulse of continuous
isolated voltage (12VDC), will usually remedy this. Otherwise,
proceed in accordance with the diagram below to re-establish
the residual magnetism:
1.3.13 - power usage
The power used by the R 449 is 30W, when the alternator is
at rated power.
1.3.14 - de-energising
The regulator is de-energised by switching off its power
supply.
Contact rating: 15A, 250V AC
1.4 - environment
- Operating temperature: -20 ˚C to +70 ˚C
- Storage temperature: -55 ˚C to +85 ˚C
- Shocks on the base: 9g for the 3 right-angled directions
- Vibrations: Less than 10Hz: 2mm half-peak amplitude
10Hz to 100Hz: 100mm/s
Above 100Hz: 8g
Exciter field
~ 10 ohms
R 452
X2
Z1
X1
Z2
E+
E-
0V
220V
380V
P2
P3
P4
P5
50Hz 60Hz
S1 S2
ST1
ST2
P1
ST3
ST5
Mains
(Supply 50/60 Hz)
20A CC / DC
ST4
Max. excit.
Voltage
A
+
-
According to mains frequency
A
D
R 452 X2
Z1
X1
Z2
E+
E-
J1
+
-
t
(12V - 10A)
Exciter field
Isolated DC
power supply
~ 10 ohms
R 452
X2
Z1
X1
Z2
E+
E-
Aux. windings
J1

9
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
R 726 : R
EGULATION OF POWER FACTOR
(2F)
AND
MAINS VOLTAGE SENSING (3F)
LEROY-SOMER Ref. 3563 GB - 4.33 / a - 01.02
2 - R 726 : REGULATION OF POWER FACTOR (2F) AND MAINS VOLTAGE SENSING (3F)
The power factor and mains voltage sensing are regulated by the R726 module. See the specific manual.
2.1 - potentiometers
P1: Potentiometer for adjusting the alternator voltage to the mains voltage (operating mode 3F).
P2: Adjustment of the power factor
P3: Stability
P4: Limitation of the power factor
10
9
8
7
6
5
4
3
2
1
400
0
S1
S2
}
}
T3
T2
T1
1 2 3 4 5 6 7 8 9 10
LED
P3
P4
P1
ST1 ST2
MAINS VOLTAGE
(PHASES 2-3)
ALTERNATOR VOLTAGE
(PHASES 2-3)
RED
GREEN
"U = U"
"Cos
j "
}
}
J1
P5 C1 C2 P6
U
VOLTAGE U = U "Cos j ""Cos j "
J2
TI / CT / 1A (PHASE 1)
LIMIT
To A.V.R.
P1
P2
P3
P4
P5 : (-R) =
P6 : (+R) =
MORE ALT. VOLTAGE (U = U)
MORE REACTIVE POWER
STABILITY (// with mains)
P.F. LAG Limit
MORE VOLTAGE (isolated)
MORE REACTIVE POWER
U = U
100 mm
115 mm
SENSING 50/60 Hz
POTENTIOMETERS
+
+
ADJUSTMENTS / CONTROLS
CONTROL OUTPUT
P2
Cos j
STAB
R2 R1
Unused terminal
400
100
100
0
}
R 726

10
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
R 726 : REGULATION OF POWER FACTOR (2F) AND MAINS VOLTAGE SENSING (3F)
LEROY-SOMER Ref. 3563 GB - 4.33 / a - 01.02
2.2 - operating diagram

11
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
TYPICAL DIAGRAMS
LEROY-SOMER Ref. 3563 GB - 4.33 / a - 01.02
3 - TYPICAL DIAGRAMS
The following diagrams are supplied for information only and are not to be used in place of the actual alternator diagrams.
3.1 - AREP 1F LV excitation
U2 V2 W2 U1 V1 W 1
+
-
2
3
00
24 25
1
23
L1 L3L2
L1 L3L2
P1 P2
S1
S2
TI04
TI //
26
4
N
F 01
AC
ST 7
ST 10
P 1
P 2
P 3
P 4
P 5
ST3
X2
Z1
X1
Z2
E +
E -
0V
110
220
38 0V
S2
S1
pot .. e t ..
50 Hz 60 Hz
123
45
J 2
1
2
3
4
5
6
7
8
9
10
J 1
1
2
3
J 3
RT 01
Z1 X1 Z2 X2
F 02
6
21
22
UWV
5
A B
a b
TP05
P1
P2
S1 S2
TI05
5A/1A
C
12
11 10
8
9
7
P 7 P 6
P 8
P 9
Note: Phase order maybe
re ersed in case of
counter clockwise
rotation of the generator
(if necessary)
Exciter
fie ld
BUS BAR
De en ergizi ng
contacts (option)
TERMINAL BOX
Neutr alr
esistor
(If used)
OUT OF SUPPLY
REMARKS
Signals or command wires: min 1.5mm2 Field or supply wires: min 4mm2
Generat or power wires
I. Max. in all wires : 10A
PR01 : R egulation board :
Seri al A V R : R 452
F01 / F02 :
Fus es
500V 16A (type: gG / 10x38 )
Wiring case of clockwise rotation If count er clockw ise - R e erse w ir es
2 and 3 of termi nal block A
Str ap ol tage potentiomet er
St rap measure of the excit ati on curr ent
Auxiliary
windi ng
Terminal
block
ARE P E citation 1F MT

12
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
TYPICAL DIAGRAMS
LEROY-SOMER Ref. 3563 GB - 4.33 / a - 01.02
3.2 - AREP 1F MV excitation
U2 V2 W2 U1 V1 W1
+
-
2 3
00
24 25
1
23
L1 L3L2
L1 L3L2
P1 P2
S1
S2
TI04
TI //
26
4
N
F 01
AC
ST 7
ST 10
P 1
P 2
P 3
P 4
P 5
ST3
X2
Z1
X1
Z2
E +
E -
0V
110
220
38 0V
S2
S1
pot .. e t ..
50 Hz 60 Hz
123
45
J 2
1
2
3
4
5
6
7
8
9
10
J 1
1
2
3
J 3
RT 01
Z1 X1 Z2 X2
F 02
6
21
22
UWV
5
A B
a b
TP05
P1
P2
S1 S2
TI05
5A/1A
C
12 11 10
8 9 7
P 7 P 6
P 8
P 9
Note: Les phases peuve t
être cr oisées e
cas de rot ati o a t ihorai re
(si ècessai re)
Excitateur
JEU DE BARRES
C o nt acts de
dése citation (option)
BOITE A BORNES
Résistance
de neutre
(Si utilisé)
PR01 :
Plati e de r égulatio
F01 / F02 :
Fus es
500V 16A (type: gG / 10x38 )
St rap pote t iomèt re U
Strap mesure du cour a t d’exci tat io
Bobi ag es
auxiliaires
Bornier
HORS FO UR NITU RE
REMARQUES
Mesures ou com mandes: mi n 1.5mm2 Pu issance rég ulateu r : min 4mm2
Pui ssance alternateu r
E citation AREP 1F MT
Régul ateur séri e : R 452
B ran ch ement représen té pou r ro tation ho raire E cas de rotatio a tihoraire : - I verser les fils e 2 et 3 du bornier A
I . Max. da s tous les f ils : 10A

13
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
TYPICAL DIAGRAMS
LEROY-SOMER Ref. 3563 GB - 4.33 / a - 01.02
3.3 - AREP 3F LV excitation
U2 V2 W 2
U1 V1 W1
+-
2 3
00 24
25
1
23
32 31
L1 L3L2
L1 L3L2
L1 L3L2
P1 P2
S1 S2
TI04
//C T
34 26 33 35
100V
4
N
F 01
AC
ST 7
ST 10
P 1
P 2P 3P 4P 5
ST3
X2
Z1
X1
Z2
E +
E -
0V
110
220
38 0V
S2S1
pot .. e t ..
50 Hz 60 Hz
12345
J 2
1
2
3
4
5
6
7
8
9
10
J 1
1
2
3
J 3
RT 01
R1 R2
pot . U Cmd U = U
Cmd 2 F
po t cos Ø
S1
S2
0V
10 0V
40 0V
0V
100 V
40 0V
1
2
3
4
5
6
7
8
9
10
J 2
1
23
45
6789
10
J 1
MR 01
P 1
Z1 X1 Z2 X2
F 02
27
30
29
28
ST 11
P 2 P 3P 4
} } } }
12 11 10
8 9 7 6
400V
{
C
21 22
UWV
5
P 7 P 6
P 8
P 9
Note: Phase order may
be reversed n case of
counter clockw se
rotat on of t he generat or
( f necessary)
To u t l ty sta t on s et -up
transformer or ma ns
Exc ter
f e ld
BUS BAR
De energizing
contacts (option)
TERMINAL BOX
Ne utr al
resistor
(If us ed)
OUT OF SUPPLY
REMARKS
Signals or command wires: min 1.5mm2
Field o r supp ly wires: min 4mm2 Gen erat or power wires
I. Max. n all w res : 10A
PR01 : R egulat on board :
Module - 2/3F : R 726
parall el ng w th m a ns
Ser al A V R : R 452
F01 / F02 :
Fus es
500V 16A (type: gG / 10x38 )
Wirin g case of clockw ise rotati on If counter clockw se - Reverse w r es
2 and 3 of term nal block A
P1 : U= U Vol tage P2 : Power Fact. P3 : Stab l ty P4 : L m t Cos Ø
Str ap vol tage potent omet er
St rap power fact or potent omet er
St rap measure of the exc t at on curr ent
Vol tage match ng C md
P.F operat on Cmd
Au x l ar y
w nd ng
Terminal
block
(only poss ble when al l the breakers are cl osed)
AREP E citation 3F BT

14
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
TYPICAL DIAGRAMS
LEROY-SOMER Ref. 3563 GB - 4.33 / a - 01.02
3.4 - AREP 3F MV excitation
U2 V2 W 2
U1 V1 W 1
+
-
2 3
00 24
25
1
23
32 31
L1 L3L2
L1 L3L2
L1 L3L2
P1 P2
S1 S2
TI04
//CT
34 26 33 35
4
N
F 01
AC
ST 7
ST 10
P 1
P 2P 3P 4P 5
ST3
X2
Z1
X1
Z2
E +
E -
0V
110
220
38 0V
S2S1
pot .. e t ..
50 Hz 60 Hz
12345
J 2
1
2
3
4
5
6
7
8
9
10
J 1
1
2
3
J 3
RT 01
R1 R2
pot . U Cmd U = U
Cmd 2 F
po t cos Ø
S1
S2
0V
10 0V
40 0V
0V
100 V
40 0V
1
2
3
4
5
6
7
8
9
10
J 2
1
23
45
6789
10
J 1
MR 01
P 1
X1 X2
F 02
27
30
29
28
ST 11
P 2 P 3P 4
} } } }
12 11 10
8 9 7 6
C
21 22
UWV
5
A B
a
b
A B
a
b
TP05
P1
P2
S1 S2
TI05
5A/1A
Z1 Z2
P 7 P 6
P 8
P 9
Note: Phase order may
be re ersed in case of
counter clockwise
rotati on of the generat or
(if necessary)
To u tili ty sta tion set-up
transformer or mains
Exci ter
fie ld
BUS BAR
De energizing
contacts (option)
TERMINAL BOX
Ne utr al r es istor
(If us ed)
OUT OF SUPPLY
REMARKS
Signals or command wires: min 1.5mm2
Field o r su pp ly wires: min 4mm2 Generat or po wer wires
PR01 :
R egulation board :
Module - 2/3F : R 726
parall eli ng w ith m ains
Serial A V R : R 452
F01 / F02 :
Fus es
500V 16A (type: gG / 10x38 )
Wir ing case of clockwise rotation If counter cl ockwise - Re erse wires
2 and 3
of terminal block
A
P1 : U= U Vol tage P2 : Power Fact. P3 : Stability P4 : Limi t Cos Ø
Str ap ol tage potentiomet er
St rap power factor potentiomet er
St rap measure of the excit ati on curr ent
Vol tage matchi ng C md
P.F operation Cmd
Au xi liary
windi ng
Terminal
block
(only possi ble when al l the breakers are c l osed)
Terminal
block
ARE P E citation 3F MT
I.max. in all wires : 10A

15
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
TYPICAL DIAGRAMS
LEROY-SOMER Ref. 3563 GB - 4.33 / a - 01.02
3.5 - 1F LV Shunt + Booster excitation
U2 V2 W2 U1 V1 W1
+
-
+
L1 L3L2 L1 L3L2
P 1
P 2P 3P 4P 5
ST3
X2
Z1
X1
Z2
E +
E -
0V
110
220
38 0V
S2S1
pot .. ext ..
50 Hz 60 Hz
12345
J 2
1
2
3
4
5
6
7
8
9
10
J 1
1
2
3
J 3
T 01
UWV
71 70
ST 10
42
43
ST 7
Fus : Fus 500V 16A (type: gG 10x38 )
N
110V
140V
220V
0V 0V
400V
0V
TP00
5 6
44
45
A
3
15
16
+
-
02 C 06
C 01
22
+
-
C 03
Fus 40
41
12
89
10 C01
1
CC
D
A
D
13 11
9
P1
P1
P1
P2
P2
P2
S1
S1
S1 S2
S2
S2
TI01
TI02
TI03
10 12 14
8 7
P1 P2
S1 S2
TI04
Coupling Y or ¹
P 7
P 6
P 8
P 9
ote: Phase order may
be reversed in case of
counter clockw ise
rotation of the generator
(if necessary)
Exci ter
fie ld
De energi zing
contacts shown
energized
TE MINAL BOX
Ne utr al r es istor
(If us ed)
OUT OF SUPPLY
EMA KS
Si gnals or comman d wires: min 1.5mm2 Field or supply wires: min 4mm2
Generator power wires
Strap for exter nal
vol tage potent iomet er
Boos ter
CT's
REGULATIO BOARD P 01
Jumper ST7 for field cur rent measurem ent
T ermi nal B lo ck
T ermi nal B lo ck
Terminal Block
Ser i al A V R : R 452
Booster monito r
720
Wiring case of clockwise rotation If count er clockw ise - R everse w ir es
1 an d 3 o f P 01 termi nal block A
// C T
Shunt + Booster E xcitation 1F BT
I . Max in all wires : 10A
BUSBA ES

16
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
TYPICAL DIAGRAMS
LEROY-SOMER Ref. 3563 GB - 4.33 / a - 01.02
3.6 - PMG 1F LV excitation
U2 V2 W2 U1 V1 W1
+
-
2 3
00
24 25
1
23 32 31
L1 L3L2
L1 L3L2
P1 P2
S1
S2
TI04
//C T
26 33
4
N
F 01
AC
ST 7
ST 10
P 1
P 2
P 3
P 4
P 5
ST3
X2
Z1
X1
Z2
E +
E -
0V
110
220
38 0V
S2
S1
pot .. e t ..
50 Hz 60 Hz
123
45
J 2
1
2
3
4
5
6
7
8
9
10
J 1
1
2
3
J 3
RT 01
F 02
12 10
8 9 7 6
C
21
22
UWV
5
PM G 3 Ø
P 7 P 6
P 8
P 9
Note: Phase order may
be reversed i case of
cou ter clockwise
rotati o of the ge erator
(if ecessary)
Exci ter
fie ld
BUS BAR
De en ergizi ng
contacts (option)
TERMINAL BOX
Ne utr al
resistor
(If us ed)
OUT OF SUPPLY
REMARKS
Signals or command wires: min 1.5mm2 Field or supply wires: min 4mm2
Generator power wires
PR01 : R egulatio board : Seri al A V R : R 452
F01 / F02 :
Fus es
500V 16A (type: gG / 10x38 )
Wir ing case of clockwise rotation If cou ter cl ockwise - Reverse wires
2 and 3
of termi al block
A
Str ap vol tage pote tiomet er
St rap measure of the excit ati o curr e t
Terminal
block Terminal
block
PMG E citation 1F BT

17
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
COMMISSIONING
LEROY-SOMER Ref. 3563 GB - 4.33 / a - 01.02
4 - COMMISSIONING
The commissioning principle is the same regardless of the
type of excitation.
4.1 - for standalone regulation
- Check fuses F1 and F2 which are situated on terminal block
C in the alternator.
- Check the regulator:
- Check the position of the ST3 jumper (select the frequency,
50 or 60Hz).
- If an external voltage potentiometer is being used,
disconnect it from the regulator and install the ST4 jumper
(regulator terminal block J2) or the ST10 jumper (terminal
block C) in the alternator terminal box.
- Turn the internal voltage potentiometer P2 on the regulator
fully anti-clockwise.
- Set the alternator to its rated speed using the drive system.
- The alternator voltage should rise to a value of 85 to 90%Un.
- Adjust the voltage to the required value using potentiometer
P2.
- Turn potentiometer P1 fully anti-clockwise.
- Perform an on-load test with power factor = 0.8 or power
factor = 1. The voltage should remain constant within the
limits of the regulator. If it is not stable, see section 13-9.
- Stop the alternator and reconnect the external
potentiometer, setting it to the centre position.
- Set the alternator to its rated speed then, using the external
potentiometer, set the alternator to its rated voltage.
- The regulator set-up phase is now complete.
4.2 - for 1F regulation (parallel
operation between alternators)
- The previous settings should be made on each alternator.
- Set the droop potentiometer to the centre position and
perform an on-load test.
- With a load at power factor = 1, the voltage does not drop or
only drops slightly; with an inductive load, the voltage drops.
This voltage dip is set using the droop potentiometer P1. The
no-load voltage is always higher than the on-load voltage; if
the voltage rises, invert the parallel operation CT. The voltage
quadrature droop is generally 2 to 3% of the rated voltage.
- The no-load voltages should be identical on all the
alternators intended to run in parallel.
- Connect the alternators in parallel at no load.
- By adjusting the voltage setting P2 or the external voltage
potentiometer on one of the machines, try to eliminate (or
minimise) the circulating stator current between the
machines.
From now on, do not touch the voltage settings.
- Match the kW rating with a minimum of 30% of the load by
adjusting the drive system speed.
- By adjusting the droop potentiometer P1 on one of the
machines, match or divide the stator currents.
- If several alternators are running in parallel, take one as a
reference.
4.3 - for 2F regulation (regulation of
power factor and 3F regulation
(voltage match circuit) (consult R726
manual ref. 2440)
- Check the wiring between the R 452 and the R 726. (See the
connection diagram).
- Check the information given for the R 726: Mains voltage, 2F
contact, 3F contact.
- If an external voltage potentiometer is being used,
disconnect it from the R 726 and add the ST1 jumper
(terminals 3 and 4 of J1) or disconnect it from terminals 25
and 26 of terminal block C of the alternator and add the ST10
jumper.
- If an external PF potentiometer is being used, disconnect it
from the R 726 and add the ST2 jumper (terminals 9 and 10
of J1) or disconnect it from terminals 29 and 30 of terminal
block C of the alternator and add the ST11 jumper.
- Perform a 1F test.
The test principle is the same as in the case of 1F regulation.
- Matching the alternator and mains voltages prior to
synchronisation (3F):
If this function is not used, match the voltages by adjusting the
voltage potentiometer.
The following settings are for the R 726.
Close the 3F contact (terminals 5 and 6 of J1 of the R 726 or
terminals 34 and 35 of terminal block C of the alternator). The
red LED lights up. Adjust potentiometer P1 to match the
alternator voltage to the mains voltage.

18
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
COMMISSIONING
LEROY-SOMER Ref. 3563 GB - 4.33 / a - 01.02
- Power factor regulation with the alternator synchronised to
the mains voltage (2F):
- The following settings are for the R 726.
When the alternator is in phase with the mains and the mains
and alternator voltages are equal, proceed with
synchronisation. Contact 2F closes when the circuit breaker
is closed. The green LED on the R 726 lights up. Open
contact 3F and remove the mains voltage reference.
Preset PF potentiometer P2 to 5 and limit potentiometer P4 to
3.5.
Without supplying kW power to the mains, the reactive
current of the alternator should be at or around 0.
Increase the kW power. When it reaches 50% of the rated
power, adjust potentiometer P4 to obtain a PF of 0.9 LAG
(inductive) on the alternator. The PF range is then 0.7 LAG
(inductive) (P2 turned fully clockwise) to 0.95 LEADING
(capacitive) (P2 turned fully anti-clockwise).
Adjust P2 to obtain the required power factor value.
Increase the kW power until it reaches the rated power. The
PF should remain constant.
If it becomes unstable, adjust potentiometer P3 on the R 726
or potentiometer P3 on the R 452.
- Stop the alternator and reconnect the external
potentiometers.

19
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
TROUBLESHOOTING
LEROY-SOMER Ref. 3563 GB - 4.33 / a - 01.02
5 - TROUBLESHOOTING
5.1 - checking the windings and
rotating diodes using a separate
excitation
During this procedure, make sure that the alternator is
disconnected from any external load and inspect the terminal
box to check that the connections are fully tightened.
- Stop the generator, disconnect and isolate the regulator
wires.
- There are two ways of creating an assembly with separate
excitation: see the diagrams below.
- Assembly A: Connect the DC supply (2 batteries in series)
in series with a rheostat of approximately 20 ohms 500W and
a diode on both exciter field wires (5+) and (6-).
- Assembly B: Connect a "variac" variable power supply and
a diode bridge to both exciter field wires (5+) and (6-).
Both these systems must be compatible with the excitation
rating of the machine (see the nameplate).
- Run the generator set at its rated speed.
- Gradually increase the exciter field power supply current by
adjusting the rheostat or the variac and measure the output
voltages L1 - L2 - L3, monitoring the no-load excitation
voltages and currents. (See the alternator nameplate or ask
Leroy-Somer for the test log).
- If the output voltages are at their rated values and matched
to within < 1% for the given excitation value, the machine is
operating correctly and the fault is due to the regulation part
(regulator, wiring, sensing, auxiliary windings).
5.2 - static checking of the regulator
If the regulator operates correctly during a static test, this
does not necessarily mean that it will operate correctly under
real conditions.
If the regulator fails the static test, it can be concluded without
doubt that the regulator is faulty.
Connect a test bulb in accordance with the diagram.
The power supply voltage must be between 200 and 240V.
The bulb voltage is 220V. The bulb power rating must be less
than 100W.
- Turn potentiometer P1 fully anti-clockwise.
- Switch on the regulator; the bulb should light up briefly and
then go out.
- Slowly turn the voltage potentiometer clockwise, to the right.
- When turned fully to the right, the bulb lights up
continuously.
- At the regulation point, turning the voltage adjustment
potentiometer slightly in one director or the other should make
the bulb light up or go out. If the bulb is either lit continuously
or does not light up at all, the regulator is faulty.
- Perform one test supplying the regulator via terminals X1,
X2 then another supplying it via terminals Z1, Z2.
Static checking of the LAM:
P2 should be positioned at the point where the bulb lights up.
Turn the P4 potentiometer slowly to the left. The bulb should
dim suddenly and the voltage drops to approximately 85% of
the power supply voltage. Return to the P4 starting position.
The bulb should light up as brightly as before.
6 - 5 +
5 A diode
Battery 12V
Rh. 20 Ω- 500 W
-+
ASSEMBLY A
Exciter field
-
+
6 - 5 +
Variac
AC
220 V
Diode
5A
50
60
70
80
90
100
40
30
20
10
0
ASSEMBLY B
Exciter field
According to mains frequency 200 - 240 V
(220 V)
R 452
X2
Z1
X1
Z2
E+
E-
0V
220V
380V
P2
P3
P4
P5
50Hz 60Hz
S1 S2
ST1
ST2
P1
ST3
ST5
Mains
(Supply
50/60 Hz)
V 300 V :
D C
ST4
Frequency
Voltage

20
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
TROUBLESHOOTING
LEROY-SOMER Ref. 3563 GB - 4.33 / a - 01.02
5.3 - troubleshooting table
- Before any intervention on the R 452 or the R 726, carefully note the potentiometer and jumper positions.
5.3.1 - for 1F, parallel operation between alternators
Symptoms Probable causes Solutions
Absence of voltage
on start-up, at no load.
- No residual magnetism or polarity inversion
between the excitation output and the excitation
input.
- De-energising contacts open.
- The speed is less than the rated speed.
- Connection lost between the regulator and the
exciter.
- Alternator loaded or short-circuited.
- External potentiometer connected incorrectly.
- Faulty regulator.
- Faulty exciter or rotating diode bridge.
- Fuses blown.
- Voltage build-up is required.
- Close this contact.
- Adjust the speed.
- Check the wiring.
- Remove the load from the alternator.
- Check the wiring.
- Test it or change it.
- Check the exciter and the diodes.
- Replace the fuses.
Voltage too high and
adjustment potentiometer
has no effect.
- Incorrect voltage at the sensing terminals.
- Loss of sensing.
- The external potentiometer has an incorrect
value.
- Faulty regulator.
- Check the wiring of the 0, 110V, 220V and 380V
terminals on terminal block J1.
- Check the wiring.
- Set a potentiometer with the correct value.
- Test it or change it.
Voltage too high, but
adjustable by the
adjustment potentiometer.
- Voltage potentiometer set too high.
- Regulator sensing incorrect.
- Faulty regulator.
- Adjust voltage potentiometer P2 or the external
potentiometer.
- Check the wiring and the sensing value at the
0V, 110V, 220V and 380V terminals.
- Test it or change it.
Voltage too low, but
adjustable by the voltage
potentiometer.
- ST3 and ST4 jumpers.
- The speed is too low.
- Exciter and rotating diodes.
- Check the presence of the ST3 and ST4
jumpers.
- Set to the correct speed.
- Check the exciter and the rotating diodes.