Sensing; Voltage Accuracy; Voltage Setting; Power Supply - Leroy-Somer R452 Installation And Maintenance Manual

LEROY-SOMER

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.
Internal
Voltage setting : ST4

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
6
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
P
RESENTATION OF THE
P2
External
Rhe
P1
R 452
Selection of underfrequency threshold using the ST3 jumper
50 Hz
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.
U/F
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.
5%Un
20%Un
Voltage
ST5 cut
U
N
U/f
0.85 U
N
Frequency
0
Ref. 3563 GB - 4.33 / a - 01.02
60 Hz
P4
0
5 2U/F
10
0
10%Un
5
10
Voltage
P2
P6
LAM
Under frequency and LAM
P4
48 or 58 Hz 50 or 60 Hz
fC fN
ST3