Original DATAKOM AVR-20 Automatic Voltage Regulator for Generator Alternators

Original DATAKOM AVR-20 Automatic Voltage Regulator for Generator Alternators

Quick Details

Place of Origin: Turkey

Brand Name: DATAKOM

Model Number: AVR-20

FEATURES

• Half-Wave thyristor output
• 0-20 amps. output current
• 0-115 volts output voltage
• Relay-less circuit design
• Low-frequency protection
• Built-in voltage adjustment
• Remote voltage adjustment
• Stability adjustment
• Easy connection scheme
• Compatible with various types of alternators.

AVR-20 Voltage Regulator is an electronic device that lets the alternator produce a fixed output voltage. It has open chassis, resin moulded design, and is intended to be mounted in the alternator’s terminal box. Basically, the unit is compatible with all brushless type alternators. A stability adjustment potentiometer is also provided for this purpose.

The AVR-20 has a special relay-less electronic circuit design. The required minimum residual voltage for build-up is 5 VAC.

DESCRIPTION

AVR-20 Voltage Regulator is an electronic device that lets the alternator produce a fixed output voltage. It has an open chassis, resin molded design, and is intended to be mounted in the alternator’s terminal box.

AVR-20 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 freewheeling diode. Basically, the unit is compatible with all brushless type alternators. A stability adjustment potentiometer is also provided for this purpose. The AVR-20 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-20 includes a low-frequency protection circuit. This feature reduces the output voltage during an overload or engine stops. Therefore the diesel engine is protected from excessive torque generated by high startup currents of large electrical equipment. Similarly, the diesel engine may be stopped under load without damage. The easy connection scheme of the device allows fast and easy replacement.

OPERATION

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 sensing voltage. The device needs 5 V-AC for a 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-20 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-20 is able to produce up to 20 amps continuous current output. The alternator voltage may be adjusted via the built-in potentiometer. Also, an external voltage adjustment feature is provided, in this case, the external potentiometer value shall be 1 kilo-ohm. 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.

INPUTS AND OUTPUTS

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

TECHNICAL SPECIFICATIONS

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 230volts
Output Current: 20A continuous,
Residual Voltage For Build Up: 5 volts minimum
Regulation: +/- 2% typical.
Power Output Stage: Half Wave tyhristor.
Internal Fusing: 10A (fast-acting fuse)
Operating temp.: -10°C (14°F) to 60 °C (140°F).
Storage temp.: -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: 280grams