______________________________________________________________________________________
2
EA42-7
50
55
60
65
70
0
10
20
30
40
50
60
70
80
90
100
GENERATOR OUT
PUT(%F
RO
M NO
RMIN
AL
)
FREQUENCY (HZ)
50 HZ CURVE
60HZ CURVE
5
10
15
20
25
30
35
40
45
1. INTRODUCTION
Sensing Inp
u
t
Voltage
220 ~ 252 VAC ± 10%, 1 phase
Frequency
50 / 60 Hz selectable
Power Input
Voltage
200 ~ 260 VAC ± 10%, 1phase 2wire
Frequency
50 / 60 Hz
Output
Voltage
Max. 42 VDC
Current
Continuous 7A
Intermittent 15A for 10 sec
Resistance
Min. 6 ohm Max. 105 ohm
Voltage Regulation
< ± 1% ( with 4% engine governing )
Voltage Build-up
Residual voltage at AVR terminal > 5 VAC
Voltage Adjustable Range
180 ~ 277 VAC
Thermal Drift
0.05% per
C change in AVR ambient
External Volts Adjustment
± 10% with 1K ohm 1 watt trimmer
EMI Suppression
Internal electromagnetic interference filtering
Unit Power Dissipation
Max. 20 watt
Under Frequency Protection (Factory Setting)
60 Hz system presets knee point at 55 Hz
50 Hz system presets knee point at 45 Hz
Over Excitation Shutdown
Field volts shut down after a time delay
If exciter field volts exceed 52 ± 2 VDC
Quadrature Droop
Max. Sensitivity 1 VAC 2%
Max. Input 5 VAC @ 5 ohm Burden
Dimensions
140mm L * 125mm W * 79.4mm H
Weight
680g ± 2%
FREQUENCY COMPENATION (See Figure 1)
1. The frequency compensation characteristic of
Figure 1 used to improve system load pickup
performance by restraining voltage recovery
until frequency has also started to recover.
2. The regulator is shipped from the factory set at a
45
Hz “corner frequency” for 50 Hz systems. For
60 Hz systems, a 55 Hz corner frequency is
achieved by removing the “50-50” external link.
OVER-EXCITATION TIME DELAY
If exciter voltage exceeds 52
2 Vdc, the regulator
automatically removes the field current, after a time
delay. The time delay is inversely proportional to the
magnitude of the detected field over voltage condition
up to 95
5 Vdc point. Beyond 95
5 Vdc, the field
voltage is removed at a much faster rate. This
shutdown function may be disabled for parallel
operation by linking terminals N and D together.
TIM
E D
ELA
Y(SE
CO
ND
S)
FIELD VOLTAGE-Vdc
0.1
1
10
100
1000
55
60
65
70
75
80
85
90
95 100 105 110 115
Figure 1
Frequency Compensation Curves
Figure 2
Typical Time Delay Characteristic Curve
