Milton CAT D100-6_S 100 kW Automatic Voltage Regulator R250 - Manual

G E N E R A T O R S
AUTOMATIC VOLTAGE
REGULATOR – R250
The circuitry of the R250 Automatic Voltage
Regulator (AVR) provides closed loop control
of the generator output voltage by regulating
the exciter field current. The R250 is powered
by the shunt field excitation system and is fitted
as standard on:
– 1000 Series Generators
– 2000 Series Generators
– 3000 Series Generators
SPECIFICATION:
● Steady state voltage regulation ± 0.5%
● Voltage supply and sensing 85 to 139 volts
(50/60 Hz)
● Rapid response time (500 ms) for a transient
voltage variation amplitude of ± 20%
● Capable of remote voltage adjustment ± 5%
LOAD ADJUSTMENT MODULE (LAM):
On load impact, the rotation speed of the generating
set decreases. When it passes below the preset
frequency threshold, the LAM causes the voltage
to drop by approximately 13% and consequently
the amount of active load applied is reduced by
approximately 25% until the speed reaches its
rated value again.
ADJUSTMENT CAPABILITY:
The R250 AVR features the following adjustment
capabilities: (Please note that no adjustments
should be made prior to careful consultation
of the generator installation and maintenance
manual).
● Generator output voltage adjustment
● Stability adjustment
● Underspeed threshold adjustment
● 50 Hz or 60 Hz frequency option
● Remote voltage adjustment option
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Market: N. America Materials and specifications are subject to change without notice.
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4 x holes Ø 5.8 x
50 x 115 mm
140 mm
75 mm
R 250
VO
L
T
FREQ. & L.A.
M. CONFIG.
ST
AB
F1
Slow fuse
250V 8 A
P1
Voltage
P2
Stability
110 E+ E- 0V
0 9
8
7 6 5 4
3
2
1
o
1
2
3
5
6
7
9
8
4
60Hz
65Hz
57Hz
47.5Hz 50Hz KNEE
SPECIA L
LAM
OFF
OFF
13%
13%
25%
25%
LAM
KNEE
KNEE
LAM OFF
LAM OFF
LAM OFF
External potentiometrer
for voltage adjusting
ST4 Option
Frequency selector 50 Hz/
60 Hz for U/F function
and LAM adjustment
Exclusively from your Caterpillar ® dealer