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Leroy Somer Alternator Automatic Voltage Regulators AVR R448

Place of Origin Franch
Brand Name Leroy somer
Certification ISO9001
Model Number R448
Minimum Order Quantity 1-5 pieces
Price Negotiable
Packaging Details Carton box
Delivery Time Within 7 days after 100% payment
Payment Terms T/T,Western Union,Cash or L/C
Supply Ability 500 pieces per Month
Product Details
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automatic voltage regulator circuit

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Product Description




Leroy Somer Alternator Automatic Voltage Regulators AVR R448




Leroy Somer Alternator Automatic Voltage Regulators AVR R448 0Leroy Somer Alternator Automatic Voltage Regulators AVR R448 1



R448 Automatic Voltage Regulator (AVR) provides closed loop control of the alternator output voltage by regulating the exciter field current. The primary winding has a voltage in ratio to that of the alternator (characteristic shunt), the next has a voltage in proportion to the stator current (compound characteristic: booster effect). Which is powered by two auxiliary windings which are independent of the voltage equal circuit. The power supply voltage is rectified and filtered before being used by the AVR monitoring transistor. With PMG excitatioin, a permanent magnet generator (PMG) added to the alternator supplies the AVR with voltage which is free of the main alternator winding. This is built-in at the rear of the machine and connected to the R448 AVR, and the ST9 jumper must be disconnected.


*Quadrature droop adjustment


*AVR Voltage adjustment


*Stability adjustment


*LAM Threshold (underspeed) adjustment


*Excitation ceiling adjustment


*Selection of single phase or three phase


*voltage sensing


*Selection of normal or rapid response time


*50 Hz or 60 Hz frequency option


*Remote voltage adjustment option


*LAM enable/disable option


*Alternator frame selection


*Excitation system selection




Input voltage: 70-140V AC, (PMG, or auxiliary winding, single, three phases)
Reaction is measured : 90-480V AC
MAX. output :DC 10A 125V
Function: Built-in low-speed , over excitation LAm



Leroy Somer Alternator Automatic Voltage Regulators AVR R448 2Leroy Somer Alternator Automatic Voltage Regulators AVR R448 3


Voltage regulation ± 0.5%
Remote voltage adjustment range ± 5%
Short circuit capability 3 x Irated for 10 seconds
Voltage sensing 95 to 140 volts (50/60 Hz)
170 to 260 volts (50/60 Hz)
340 to 520 volts (50/60 Hz)
Response time Normal (1 sec) for ± 20% voltage variation
Rapid (0.3 sec) for ± 20% voltage variation


Sensing voltage

terminal 0-110V=95-140V

terminal 0-220V =170-260V

terminal 0-380V=340-520V

Frequency 50-60Hz
Voltage input 40-50VAC, 3 phase
Harmpnic auxiliary winding 6-150VAC (no-load rms)
Output Voltage max 160VDC at 120VAC input
Current max 10A
Resistance 15 ohms minimum
Regulation +/-5% RMS with 4% engine governing
Voltage build-up Residual voltage at avr terminal≥5VAC
External Voltage Adjustment +/-10% with 1k ohm 1 watt trimmer
Generator Power 50-300kw


Shipment Term


1. We Ship to Worldwide, except APO/FPO


2. Orders processed timely after showing remittance copy.

3. We only ship to confirmed order addresses. Your order address MUST MATCH your address.


4.Items are shipped from China by Airmail, reach most of the countries within 4 to 20 business days.


5.Delivery time depends on destination and other factors, it may takes up to 20 business days.


automatic voltage regulator R448 3 phase generator avr

6. SERVICE TRANSIT TIME is provided by the carrier and excludes weekends and holidays. Transit times may vary, particularly during the holiday season.


7. If you have not received your shipment within 30 days from payment, please contact us. We will track the shipment and get back to you as soon as possible with a reply. Our goal is customer satisfaction!




1. Guarantee:1 year after selled.

2. During guarantee,the items share free repairs or replacement.

3. Customer is responsible for the freight come-and-go,and the custom tax.

4. You may consider to send the defective item with a economical way,and we send back the repaired items with your new order together.

5. To save the cost,pls send the item back without packing.

6. Pls provide the defective appearance and related invoice number.

7.We do not repair or replace item with an expired warranty.

8.All emails will be answered within 1 business day. If you do not receive our reply, please kindly re-sent your email or give us a call any time.