AVR for generator R438

AVR for generator R438 The circuitry of the R438 Automatic Voltage Regulator(AVR) provides closed loop control of the generator output voltage by regulating the exciter field current. SPECIFICATION: Voltage regulation: +/- 0.5% Short circuit capability :3 × lrated for 10 seconds (AREP or PMG excitation ) Voltage sensing : 95 to 140 volts (50/60 Hz ) or 170 to 260 volts (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% 1000 series alternators do not have PMG option