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Alternator Voltage Regulators

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

AVR-4 AVR-5 AVR-8 AVR-12 AVR-20 AVR-40 AVR8-380

Output Current 4A 5A 8A 10A 20A 40A 8A
Min. Input Voltage (V) 190 190 190 190 190 190 190

Max. Input Voltage (V) 260 260 260 260 260 260 450

Max. Output @230V L-N 115 115 115 115 115 115 200

Voltage Adjust Pot ■ ■ ■ ■ ■ ■

External Voltage Adjust ■ ■ ■ ■ ■ ■ ■

Stability Adjustment ■ ■ ■ ■ ■ ■ ■
50 / 60 Hz selection ■ ■ ■ ■ ■ ■ ■

Low Freq. Protection ■ ■ ■ ■ ■ ■ ■

Voltage Adjust Input ■ ■ ■ ■ ■ ■ ■

CT Droop Input ■ ■ ■

Overload Protection ■ ■ ■

High Temp. Protection ■ ■ ■

Input Low Voltage Prot. ■ ■ ■
Output Current Limit

Isolated Measuring Input ■