1.Caterpillar AVR VR6 

VR6 controls the DC exciter field power of conventional, 50 or 60 Hz brushless genera tors.The regulator(VR6) includes frequency compensation with selectable slope, inverse time over-excitation shutdown, solid-state build-up circuitry, single-phase or three-phase voltage sensing, single-phase or three-phase shunt, or permanent magnet power input, and parallel droop compensation, and an accessory input. The accessory input provides compatibility with accessories such as a var/power factor controller. 

 

2.VR6 Technical specification:

Input:
Voltage, rated                     120 V  240 V
Voltage, limits                90-140 V   180-280 V
Frequency                   50-240 Hz  50-240 Hz
Burden (at rated V)         1440 VA  2400 VA
Output:
Voltage, continuous           65 Vdc  125 Vdc
Voltage, forcing 10 sec.   100 Vdc  200 Vdc
Current, continuous           12 Adc  10 Adc
Current, forcing 10 sec.     25 Adc  20 Adc
Min. feld resistance          4 Ohms  10 Ohms 

Sensing: 100 to 120 V +/-10% with standard 10K Ohm control, 1 phase or 3 phase, 50/60 or 400 Hz;

Paralleling: 1 A or 5 A for 6% droop maximum; 10 VA maximum burden;

Regulation accuracy: +/- 0.5% maximum;

Under frequency protection breakpoints: Adjustable 45 to 65 Hz;

Regulator response: Less than 4 milliseconds;

Thermal stability: Less than 0.5% per 40° ambi-ent temperature change;

 Power dissipation: Less than 50 W at maximum continuous rating;