DATAKOM AVR-4 voltage regulator is a electronic device which lets the alternator to produce a fixed output voltage. The device has open chassis, resin molded design and is intended to be mounted in the alternator's terminal box. The unit does not include moving parts; therefore it is able to operate in highly vibrating environments. The device measures phase to neutral of the alternator and adjusts the DC voltage applied to the excitation winding in order to reach the desired voltage. The unit offers low-frequency protection feature. A frequency measuring circuit continually monitors the generator output and provides low-frequency protection of the excitation system, by reducing the output voltage proportionally with frequency below 45Hz. The excitation power is derived directly from the generator terminals. The required minimum residual voltage for build up is 2 V-AC. The output stage of the device is a Half Wave thyristor 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. FEATURES: Half-Wave thyristor output 0-115 volts output voltage Start-up with 2 VAC Compatible with various alternators Designed for highly vibrating environment Built in voltage adjustment Stability adjustment Soft starting of voltage Compatible for 50 and 60 Hz Low frequency protection Simple connection diagram. TECHNICAL SPECIFICATIONS: INPUT Voltage 195-265 V-AC (L-N) Frequency 50/60 Hz nominal OUTPUT Voltage max 115 V-DC at 230 V-AC input Current max 4 A-DC (continuous) REGULATION ±%1 (with %4 engine governing) SOFT START 2 sec UNDER FREQUENCY PROTECTION 45 Hz BUILD UP VOLTAGE 2 V-AC at AVR terminals DIMENSIONS 125x68x35mm (L x W x H), Weight: 200gr Fixing centers: 115mm, 2xM6 ENVIRONMENTAL Operating temperature -20 to +70 °C Maximum humidity 95% non-condensing. Storage temperature -30 to +80 °C WE DO NOT SHIP THIS PRODUCT TO USA AND CANADA