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2
EA341
SECTION 1 : SPECIFICATION
Sensing Input
Quadrature Droop Input
Voltage
190
264 Vac Max, 1 phase 2 wire
Burden
10 ohms
Frequency
50/60 Hz, selectable
Max. input
0.33 A
Max. sensitivity
0.07 A for 5% droop (PF = 0)
Power Input (PMG)
Voltage
170
220 Vac Max, 3 phase 3 wire
Over Voltage Detector Input
Current
3A / Phase
Set point 300V. Time delay 1 sec (fixed)
Frequency
100
120 Hz, nominal
CB trip coil volt
10
30 Vdc / 0.5 Amp
CB trip coil resistance 20
60 ohms
Excitation Output
Voltage
Max. 120 Vdc @ power input 220 Vac
Current Limit Input
Current
Continuous 2.7A
Burden
10 ohms
Intermittent 6A for 10 secs.
Sensitivity range
0.5
1A
Resistance
Min. 15 ohm
Under Frequency Protection (Factory Presets)
External Voltage Adjustment
Set point 95% Hz
Max. +/- 10% @ 1K ohm 1 watt potentiometer
Slope 170% down to 30 Hz
Voltage Regulation
Over Excitation Protection
Less than +/- 1% ( with 4% engine governing )
Set point
90 Vdc
Time delay
10 secs. (fixed)
Build Up Voltage
5 Vac residual volts at power input terminal
Voltage Thermal Drift
Less than 3% at temperature range -40 to +70
˚C
Soft Start Ramp Time
2 s/- 10%
Environment
Operating Temperature -40 to +70
˚C
Static Power Dissipation
Storage Temperature
-40 to +85
˚C
Max.12 watts
Relative Humidity
Max. 95%
Vibration
3.3 Gs @ 100
2K Hz
Analogue Voltage Input
Input Resistance 1K ohm
Dimensions
Max. Input
+/- 5 Vdc
150.0 (L) x 135.0 (W) x 48.0 (H) mm
Sensitivity
1V for 5% generator volt
Weight
394 g +/- 2%
SECTION 2 : GENERAL DESCRIPTION
2.1
EA341 is a two phase sensed Automatic Voltage
Regulator and forms part of the excitation system
for a brush-less generator. Excitation power is
derived from a three-phase permanent magnet
generator (PMG), to isolate the AVR control
circuits from the effects of nonlinear loads and to
reduce radio frequency interference on the
generator terminals. Sustained generator short
circuit current is another feature of the PMG
system.
2.2
The AVR senses the voltage in the main
generator winding and controls the power fed to
the exciter stator and hence the main rotor to
maintain the generator output voltage within the
specified limits, compensating for load, speed,
temperature and power factor of the generator.
2.3
Soft start circuitry is included to provide a smooth
controlled build up of generator output voltage.
