Specifications of Leroy Somer R438 AVR Automatic Voltage Regulator for Brushless Generator
1. Directly Manufacturer
2. Over 15 years experience in generator field
3. OEM Service

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 self-sufficient 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 proportion to the stator current (compound characteristic: Booster effect).
This excitation system consists of a "PMG" (permanent magnet generator). This is fitted at the rear of the machine and connected to the R438 AVR.
The LAM system is integrated in the R 438 AVR as standard. Role of the "LAM" (Load Adjustment Module) On function of a load, the rotation speed of the generator set decreases.
the purpose helps the genset to return to its rated speed faster thanks to a gradual increase in voltage according to the principle:
General Characteristics
> Voltage regulation +/- 0.5 % at steady state and constant speed.
> Phase to phase voltage sensing.
> Control by transistor means the regulation quality is independant of load applied.
> Integrated "LAM" system to cope with increased loads applied to the engine
> Suitable for high levels of vibration and harsh environments.
> The R 438 is compatible with other modules giving additional functions.
> Standard power supply: AREP or PMG.
> Rated overload current: 8 A - 10 s
> Electronic protection (overload, shortcircuit on opening of voltage sensing circuitexcitation overload current for 10 seconds then return to approximately 1A.
> Fuse : F1 on X1, X2. 8A ; slow - 250V
> Voltage sensing : 5 VA isolated via transformer;
> 0-110 V terminals = 95 to 140 V,
> 0-220 V terminals = 170 to 260 V,
> 0-380 V terminals = 340 to 520 V.
> Voltage regulation ± 1%.
> Normal or rapid response time via ST2 jumper
> Voltage adjustment via potentiometer P2
> Current sensing (parallel operation): C.T. 2.5 VA cl1, secondary 1 A (optional).
> Quadrature droop adjustment via potentiometer P1
> Max. excitation current adjustment via P5





Depending on various circumstances, three different delivery methods have been taken: by sea, by air cargo and by express service.
*By sea. This is the most economical way of delivery. Suit for big quantity order, the delivery cost dramatically low and assist you in achieving maximum profit. It normally would take about one month for cargoes to reach their destination port.
*By air cargo. The advantage of air cargo is it costs much less time than delivery by sea. Generally it would take about one to two weeks for cargo reaching its destination.
*By express service. It is the most expensive way of delivery, but it is really quick and convenient. Normally this door to door service can deliver the goods to your company only in 3-5days. Fortunately, we have signed big discount contract with most express companies, such as TNT, DHL and UPS, to help our customers cut their delivery expenditure.


In most situations, we accept T/T (telegraphic transfer or wire transfer) as the main payment method for normal orders. There are other different payment methods which are listed below:
T/T(telegraphic transfer): For order value which is lower than 3000 USD, 100% payment need to be made in advance. For order value which is higher than 3000 USD, 30% deposit need to be made in advance and the balance should be transferred when cargo is ready for delivery.
Western union: western union could be accepted only when the cargo sent by express service and do not need clear the custom in China.
PayPal: only be accepted for easy buy customers who delivery the goods by express service and do not need clear the custom in China.
After you transferred the deposit or complete payment of an order, please remember to send the copy of bank slip to our sales personnel by either e-mail or fax as the evidence of payment.

1. Our warranty period is 12 months from the date when the goods have been notified as ready for despatch by us.

2. During the guarantee period, we will repair or replace any damage that under proper use appears in the goods, except for the incorrect operation.

Tony (Export Manager)

Skype: benjamin-hua

Email: info@alternator-avr.com

Web: http://www.alternator-avr.com