The DATAKOM AVR-8 voltage regulator is an electronic device that allows the generator to produce a fixed output voltage.
The device has an open chassis, resin construction and is designed for installation in the generator terminal box. The device does not include moving parts; therefore, it is capable of operating in conditions of strong vibration.
The device measures the phase-to-neutral or phase-to-phase voltage of the AC generator and adjusts the DC voltage applied to the excitation winding until the desired voltage is reached. The device has a low-frequency protection function. The frequency measurement circuit continuously monitors the generator output and provides an output for low-frequency protection of the excitation system, reducing the output voltage in proportion to the frequency below a manually adjustable threshold.
The nominal frequency can be easily changed to 50 or 60 Hz in the field by selecting a click link.
The sensitivity loss protection circuit stops excitation and protects the windings if there is no voltage at the sensor input.
The excitation power is obtained directly from the generator terminals. The minimum residual voltage required for build-up is 4 V AC.
The output stage of the device is a half-wave thyristor output connected to a free diode.
The device is basically compatible with all brushless AC generators. For this purpose, a stability adjustment potentiometer is also provided.
The ±3 V analog input provides external voltage regulation.
The AVR has the ability to connect CTs to allow parallel operation with other similarly equipped generators. The overload protection circuit limits the output current to its rated value, preventing the unit from malfunctioning under overload or short circuit conditions.
FEATURES: Half-wave thyristor output Designed for highly vibration environments Built-in voltage regulation system Stability regulation Compatible with various generators External trimmer input for voltage regulation Analog voltage regulation input Parallel start input Sensor input provides phase-phase or phase-neutral control Compatible with frequencies of 50 and 60 Hz Low-frequency protection Exciter protection from overcurrent High-temperature protection Sensor loss protection Additional adjustable overload limit.
TECHNICAL SPECIFICATIONS: INPUT CHILDREN'S voltage 195-265 V-AC (LN) 340-450 V-AC (LL) (see wiring diagram) Frequency 50-60 Hz nominal POWER INPUT Voltage 195-265 V-AC (LN) Frequency 50-60 Hz nominal OUTPUT Maximum voltage 90 V DC at 207 V AC input Maximum current 8 A-DC (continuous) REGULATION ± 1% (see note 1) THERMAL DRIFT 0.03% per °C change in ambient AVR (see note 2) TYPICAL SYSTEM RESPONSE AVR response 20 ms SOFT START 2 sec EXTERNAL REGULATION VOLTAGES±10% with 2kΩ 1W trimmerFREQUENCY PROTECTION42-50 Hz or 52-60 Hz (adjustable)POWER DISSIPATIONMaximum 18WOUT VOLTAGE4 V-AC on AVR terminalsANALOG INPUT±10% with ±3 V-DC (see note 3)SQUARED INPUTMax. input: 5AMax. drop: 10% (adjustable)DIMENSIONSHeight: 37 mm, Weight: 250 gECOLOGICALOperating temperature -20 to +70 °CMax. humidity 95% without condensation.Storage temperature -30 to +80 °CNOTEs1. With 4% motor regulation.2. Heated to 70°C3. Any device connected to the analog input must be galvanically isolated from ground with an insulation strength of 500 V AC.
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