Original Leroy Somer Generator Spare Parts Alternator AVR R731
1 - DESCRIPTION
The R 731 optional three phase sensing modul is designed to
be used with the R438, R448, R449 single phase sensing
voltage regulators.
2 - CHARACTERISTICS
2.1 - voltage sensing
The voltage sensing is done with three 2VA single phase
transformers.
Input voltage :
- High voltage tap (400V) :
340V-5% to 480V=5%
- Medium voltage tap (230V) :
200V-5% to 240V+5%
- Low voltage tap (110V) :
90V-5% to 140V+5%
Internal voltage rheostat :
The voltage can be adjusted using the internal rheostat P1.
This rheostat is designed to provide +/-5% adjustment from
any voltage within the above voltage ranges.
Remote voltage rheostat :
If required, remove the ST10 jumper in order to connect a
remote voltage rheostat.
A 470 Ohms - 3W rheostat can be used for a +/-5% voltage
adjustment range or a 1k Ohms - 3W rheostat for a +/-10%
voltage range.
An ST1 jumper was included on older R731 modules to
increase the voltage adjustment range but was discontinued.
2.2 - voltage droop
Current sensing : C.T. for // operation
Location : standard line 1 (U), option line 2 (V).
Consult diagrams.
- Maximum continuous current : 1.3A
- Nominal current : 1A
- Maximum current for 10s : 10A
Voltage droop rheostat :
The P2 rheostat on the R731 can be used to adjust the
voltage droop. It is designed to provide a minimum voltage
droop of 8% at 0 power factor and 1A from the paralleling CT.
3 - INSTALLATION
The R731 module is designed to be installed vertically next to
the voltage regulator.
4 - ELECTRICAL SCHEMATICS
2 typical wiring schematics are provided :
- with the CT for parallel operation on the phase U
- with the CT for parallel operation on the phase V
Consult drawing.
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