Milton CAT D100-6_S 100 kW Automatic Voltage Regulator R438 - Manual

AUTOMATIC VOLTAGE
REGULATOR – R438
The R438A Automatic Voltage Regulator (AVR) is
an advanced electronic component that provides
closed loop control of the generator output voltage.
Used when the generator is configured with the
AREP excitation system (Option AVR14) or the
Permanent Magnet Generator (PMG) system
(Option AVR12) on the following generators:
– 1000 Series Generators
– 2000 Series Generators
– 3000 Series Generators
With the AREP excitation system the R438 AVR
is powered by two auxiliary 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 of
the generator.
SPECIFICATION:
● Voltage regulation ± 0.5%
● Short circuit capability: 300% of I-rated for
10 seconds when in AREP or PMG configuration
● 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
● Capable of remote voltage adjustment: ± 5%
LOAD ADJUSTMENT MODULE (LAM):
On load impact, the rotation speed of the
generator set decreases. When it passes below
the preset frequency threshold, the LAM is
activated and causes the voltage to drop by
approximately 15% and consequently the
amount of active load applied is reduced by
approximately 25% until the speed reaches
it’s rated value again.
G E N E R A T O R S
LEHE4006-00