Leroy Somer R438 AVR Original Replacement for Brushless Generator

1. Directly Manufacturer
2. Over 15 years experience in generator field
3. OEM Service

LEROY SOMER R438 AVR Original Replacement Automatic Voltage Regulator is built to fully replace the original version, same fit, form and function
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).
The power supply voltage is rectified and filtered before being used by the AVR monitoring transistor. This principle ensures that regulation is not unnatural by distortions generated by the load. 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.
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

Founded in 1997, Aztechy Power Technology Co., Ltd is the professional manufacturer of marine generator, RV generator, ultra-silent generator, brushless AC alternator and AVRs. OEM of Kubota, Doosan, FAW and LOVOL diesel engine, and agent of SmartGen genset controller.

Our main products are

• Marine Generator - range from 5-30kW, powered by Kubota, Yanmar and OUMA engine.
• RV Generator - range from 5-30kW, powered by Kubota, Yanmar and OUMA engine
• Rainproof Ultra-Silent Generator - range from 8-300kW, powered by, Kubota, Doosan, Perkins and OUMA engine.
• Alternators - rating from 5.4KVA to 2830KVA, 50Hz/60Hz with class H insulation as standard.
• All kinds of AVR series such as Stamford, Leroy Somer, Mecc Alte, Marelli, Marathon, etc.
• Housing&Coupling Disk, PMG, Droop Kits, Rectifier, Diodes&Varistor, Isolating Transformer, Anti Vibration Mounting and other spare parts.

We have passed the certification of CE; CSA; ISO9001. By right of skillful producing technique and exquisite processing technique, our products win trust and recognition of customers. Our products are exported to over 30 countries and regions in Europe, South America, Southeast Asia and the Middle East. Aztechy Power enjoys an excellent reputation at home and abroad.

Holding “Fine Materials, Perfect Manufacture,Efficient Management” as its production principle, Aztechy Power adopts the strict quality inspection in every material, parts and components, production procure and product. At APower, we are committed to providing the highest level of customer service, competitive pricing, speedy delivery and a comprehensive, cutting-edge product offering. Our ultimate goal is your satisfaction.