Power Master R438 Automatic Voltage Regulator

Power Master R438 Automatic Voltage Regulator

R438 Automatic Voltage Regulator. Volt. Sensing: 95 to 140 volts (50/60 Hz) or 170 to 260 volts (50/60 Hz) or 340 to 520 volts (50/60 Hz)

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VOLTAGE INPUT

40-50VAC, 3 phase

OUTPUT

Voltage: max 160VDC at 120VAC input/ Current: max 8

WEIGHT

1.4 POUNDS

SIZE

7 x 6 x 2 Inches

STORAGE

-55°C ; +85°

Key Features
Description

R438 AVR Automatic Voltage Regulator Exact Generic Replacement

OPERATION

-40°C ; +70°C

FUSE

F1 on X1, X2. 8A ; slow - 250V

VOLTAGE SENSING

95 to 140 volts (50/60 Hz)

Voltage regulation - ±0.5%
Voltage input - 40-50VAC, 3 phase
Current - max 8A
Output - Voltage: max 160VDC at 120VAC input/ Current: max 8
Resistance - 15 Ω minimum
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 volts (50/60 Hz) or 340 to 520 volts (50/60 Hz)

Storage - -55°C ; +85°
Operation - -40°C ; +70°C
Standard power supply - AREP or PMG.
Rated overload current - 8 A - 10 s
Fuse - F1 on X1, X2. 8A ; slow - 250V
Response time - Normal (1sec) 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.

R438 AVR 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

The 3-phase Generator AVR Automatic Voltage Regulator R438 AVR is powered by two auxiliary windings which are self-sufficient of the voltage match circuit, the first winding has a voltage in proportion to that of the alternator (characteristic shunt)