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The Automatic voltage regulator (AVR) is a compact, high performance encapsulated unit.The AVR incorporates latest technology and efficient semiconductor to achieve a high degree of miniaturization when applied to 3Ø and 1ØAC brushless generator within its input and output limits, the unit offers excellent reliability.

The AVR supplies DC excitation to the exciter field of a brushless generator to keep the terminal voltage within close limits from NO-LOAD to FULL LOAD.

The recovery time on sudden loading is likely to be around 0.5 sec. to recover 98% of the rated voltage. Please note that the transient performance like voltage dip and recovery time are mainly decided by the generator and exciter design parameters. Best performance from the regulator can be obtained by keeping full load excitation around 60V DC. The generator employs true average sensing circuit, dV/dt snubber and special loading like battery charger, DC drives etc.The voltage regulation is guaranteed only for linear loading. Severely distorting NONLINEAR loads can cause regulation problem.AVR is tested prior to dispatch through a quality plan, for standard voltage and frequency.Soft start circuitry is included which provides a smooth control on build up of generator output voltage.A frequency roll off circuit continually monitors the generator, under speed protection by reducing the generator output voltage proportionally with speed below a threshold.

TECHNICAL SPECIFICATION

1) Sensing input

- Voltage: 240 V AC ±20% for 1 phase, 

415 V AC ±20% for 3 phase, 2 line sensing 

AVR Senses true average of the line to line 

waveform. Use Resistor (SMD) network for 

trouble free sensing & control of sensed 

voltage / regulation.

2) Input power

- Voltage: 240V AC r m s ± 20%

- Frequency: 50/60 Hz

3) Output power

- Voltage: 95 V DC at 240V AC Input

- Current:

 • 4 Amps DC Continuous

• 6 Amps for 30ses.(when allowed by field resistance)

4) Operating temperature: -20ºC to +70ºC

5) Storage temperature: -40ºC to +80ºC

6) Voltage adjustment: min ± 10% of rated 

voltage.

7) Stability adjustment: adjustable to get 

Steady state Stability good transient 

response.

8) Under frequency roll - off adjustment: 

available below 46 Hz for 50 Hz & below 

56 Hz for 60 Hz.

9) Voltage Build up: 2 Volts (L-N)

10) Voltage regulation: ± 1% at AVR 

terminals.

11) Thermal drift: ± 1% for 30º C change in 

temperature.

12) Response time: less than 50 milli 

seconds.

13) Closed loop response: typically 0.5sec 

to recover to 98% of the set voltage for a 

field forcing ratio of 1:2.

14) Sense Loss protection: voltage should 

collapse, when the sensing circuit is open.

15) Over excitation protection: 10V DC to 

85V DC.

Set point : 60 V DC

16) Fuse for protection: 4 Amps, 240 Volts 

AC.

17) All potentiometers: multi-turn

18) Sealing of Potentiometers: except V – 

trim pot all pots are sealed.

19) Frequency roll off indicator: LED 

provided (UF).

20) Sense Loss indicator: LED provided 

(SL).

21) Over excitation indicator: LED provided 

(OE).

22) Protection on the devices: Suitable R-C 

Snubber to be provided for the device used 

to protect this from surge.

23) Potting/ Encapsulation Details: the 

components on the AVR should be 

completely encapsulated with suitable PU 

resin compound to absorb transients / 

vibrations while in operation.

24) Excitation details of alternator: (typical)

- Full load:

 • Excitation Voltage: 40 to 50 Volts

 • Excitation Current: 2.5 to 4.0 Amps

25) Terminal marking: refer drawing

26) Dimension:

- Overall: 104 x 94 x 40 (in mm)

- Mounting: 83 (in mm)

- Mounting hole dia: 5.5 (in mm)

27) Weight: 185 Gms