DATAKOM AVR-12 Alternator Voltage Regulator For Sale

DATAKOM AVR-12 Alternator Voltage Regulator

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DATAKOM AVR-12 Alternator Voltage Regulator:

DATAKOM AVR-12 Alternator Voltage RegulatorDetail


AVR-12 Voltage Regulator is an electronic device which lets the alternator to produce fixed output voltage. It has open chassis, resin molded design and is intended to be mounted in the alternator's terminal box.

AVR-12 measures the voltage between one of the alternator phases and the neutral point and adjusts the DC voltage applied to the excitation winding until reaching the desired voltage. The output stage of the device is a Half Wave tyhristor output associated with a free wheeling diode. Basically the unit is compatible with all brushless type alternators. A stability adjustment potentiometer is also provided for this purpose.

The AVR-12 has a special relay-less electronic circuit design. The required minimum residual voltage for build up is 5 V- AC. The unit does not include moving parts; therefore it is able to operate in highly vibrating environments.

The AVR-12 includes a low frequency protection circuit. This feature reduces the output voltage during overload or engine stop. Therefore the diesel engine is

protected from excessive torque generated by high startup currents of large electrical equipments.

Similarly, the diesel engine may be stopped under load without damage. The easy connection scheme of the device allows fast and easy replacement.


Half-Wave tyhristor output

0-10 amps. output current

0-115 volts output voltage

Relay-less circuit design

Low frequency protection

Built in voltage adjustment

Stability adjustment

Remote voltage adjustment feature

Easy connection scheme

Compatible with various types of alternators


The device operates on 230-volt phase-to-neutral voltage. The output voltage, as well as the internal supply voltage, is directly picked up from the input ensing voltage. The device needs 5 V-AC for startup.

The half wave tyhristor output voltage is 115 volts maximum. During operation, the device continuously monitors the input voltage and increases/decreases the excitation voltage in order to maintain the input voltage to a constant value.

The AVR-12 keeps the alternator voltage change in minimum limits in case of a load change, and helps to reach the required voltage value quickly. The regulation is P-I type, the proportional reaction is fast and the slow acting integral reaction helps the unit to recover the precise set voltage. The stability potentiometer adjusts the reaction speed of the device. This helps the unit to comply with a large variety of alternators.

The AVR-12 is able to produce up to 12 amps continuous current output. The alternator voltage may be adjusted via the built in potentiometer. Also external voltage adjustment feature is provided, in this case the external potentiometer value shall be 1 kiloohms. The low frequency protection circuit shuts off the excitation voltage in order to prevent damage during engine stopping under load. The factory set value for the protection is 45Hz.

The alternator EXCITATION terminals shall not be connected to any point but the unit. The NEUTRAL and EXCITATION (+) points are internally connected.


PHASE-R: Alternator phase input.

NEUTRAL: Alternator neutral input, internally connected to the Excitation(+) terminal.

EXCITATION (+): Excitation winding (+) terminal, internally connected to the Neutral terminal.

EXCITATION (- ): Excitation winding (-) terminal


Phases: single phase ;

Voltage Adjustment Range: 210-250 Volts min ;

Frequency: 50/60Hz ;

Frequency Protection Adj. Range: 40-50Hz ;

Output Voltage: 0-115 volts-DC at 230 volts ;

Output Current: 10A continuous, 20A for 5sec forcing ;

Residual Voltage For Build Up: 5 volts minimum ;

Regulation: +/- 2% typical ;

Power Output Stage: Half Wave tyhristor ;

Internal Fusing: 10A (fast acting fuse) ;

Operating temperature: -10°C (14°F) to 60°C (140°F) ;

Storage temperature: -20°C (-4°F) to 80°C (176°F) ;

Maximum humidity: 95% non-condensing ;

Dimensions: 125x68x35mm (L x W x H) ;

Fixing centers: 115mm, 2xM6 ;

Weight: 200 grams ;

Duty For International Buyers

Importduties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer's responsibility.
Please check with your country's customs office to determine what these additional costs will be prior to offerding/buying.

Shipping Policy

● Expedited Shipping(FedEx/DHL/TNT/UPS): To USA 3-6 Workdays ,To other countries 3-8 Workdays

● Economy Shipping(Post/Airmail/DHL e-commerce): To USA 7-12 Workdays ,To United Kingdom & Australia 20-35 Workdays , To other countries 20-50 Workdays

● This is normal condition,but sometimes int'l delivery is highly depended on the courier company and local customs/duties

● We only accept Paypal payment.We are not able to ship to PO Boxes or APO/FPO addresses

● Please make sure to provide us with correct , precise and detailed shipping Address

● And it would be better to leave us correct phone number,so the delivery man can get in touch with you easily when your package arrive .And we wouldn't use your phone number for other purpose.

● Order will be shipped out within 1 to 3 business days upon payment received or cleared.

● If you don't receive package over 30 business workdays , please notify us.

Payment Mathord

● PayPal payment accepted only.

● Items will be shipped to your address. Please make sure it is correct.

● Payment must be received 4 days after sale ended.

Returns Policy

● Customer satisfaction is our top goal. We believe our items are so outstanding. All products are quality checked. They are new and in good condition when shipped to our customers. We are convinced you will be happy with your Purchase.

● If product is defective or damage upon arrival, or wrong product shipped, please contact us immediately. Returns accepted within 30 workdays of delivery date and item must be in original new condition, not worn or altered in any way with attached tags & wrap. Otherwise deal is final. Return shipping must be paid by buyer.

● Please contact us first if you have any problems/questions/concerns. We will be happy to resolve any issues you may have in a cordial and friendly manner.

About response

● When you satisfied with our product and services please leave us positive response.

● If a problem occurs, just contact us using the " Ask the seller a question" link on .

● We appreciate your Postive response, and will do the same in return. DO NOT leave negative response without first communication with us. Please allow max 3 business days for us to response .


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