The circuitry of the R438 Automatic Voltage Regulator (AVR) provides closed loop control of the generator output voltage by regulating the exciter field current. The R438 can be powered by AREP or PMG field excitation system and is
fitted as an option on:
-1000 Series Generators*
-2000 Series Generators
– 3000 Series Generators
With the AREP excitation system the R438 AVR is powered by two auxilliary windings which are independent of the voltage detection circuit. With the PMG option the R438 AVR is powered by the PMG which is fitted at the rear end of the generator.
SPECIFICATION:
Voltage regulation ±0.5%
Short circuit capability: 3 x Irated for 10 seconds (AREP or PMG excitation)
Voltage sensing:
95 to 140 volts (50/60 Hz) or
170 to 260 voits (50/60 Hz) or
340 to 520 volts (50/60 Hz)
Response time:
Normal (1 sec) for ±20% voltage variation or Rapid (0.3 sec) for ±20% voltage variation
Remote voltage adjustment range of: ±5%
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