Kutai electronics EA05A Operation Manual

EA05A

Generator Automatic Voltage Regulator

Operation Manual

Kaohsiung : No.3, Lane 201, Chien Fu ST., Chyan Jenn Dist., Kaohsiung, TAIWAN

Tel : + 886-7-8121771 Fax : + 886-7-8121775

URL : http://www.kutai.com.tw Email : [e-mail]

Self Excited Automatic Voltage Regulator

5 Amp AVR For General Generators

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2 EA05A

1. INTRODUCTION

Sensing Inpuuuut

Voltage 220 / 380 / 440 VAC, 1 phase2 wire
DIP switch selectable
Frequency 50 / 60 Hz, DIP switch selectable

Power Input

Voltage 100 ~ 300 VAC, 1 phase 2 wire

Output

Voltage Max. 90 VDC @ 240 VAC input
Current Continuous 5A
Intermittent 7A for 10 sec
Resistance Min. 15 ohm Max. 100 ohm

Voltage Regulation

< ± 0.5% ( with 4% engine governing )

Voltage Build-up

Residual voltage at AVR terminal > 5 VAC

Thermal Drift

0.03% per °C change in AVR ambient

External Volts Adjustmen

± 7% with 1K ohm 1 watt trimmer

EMI Suppression

Internal electromagnetic interference filtering

Unit Power Dissipation

Max. 8 watt

Under Frequency Protection (Factory Setting)

60 Hz system presets knee point at 55 Hz
50 Hz system presets knee point at 45 Hz

Soft Start Ramp Time

3 sec.

Dimensions

101mm L * 69mm W * 47.5mm H

Weight
183g ± 2%

2. WIRING

When generator supply is over load, N phase will be
different with the sharing load by 3 phases (load
imbalance). Hence, the voltage from N phase to 3
phases (R.S.T.) will be altered. When the rated
voltage of the traditional single input’s AVR is above
220V, it will increase the voltage drift rate by using N
phase as the detective input. It will also cause the
voltage imbalance.

EA05A can improve the above situation, and
increase the generator’s rated voltage usage space,
such as 380V, 440V. We can all detect by the
“phase voltage”.

1. When the rated phase voltage of the generator is
220VAC, the input terminals B, C and sensing
terminals A, C can join together (as show as
figure3. It’s the original setting).or connect
independent.(as show as figure2).

2. When the rated phase voltage of the generator is
380V, 440V, the input terminals B, C and sensing
terminals A, C must separate connect the wiring
(as show as Figure 4 or figure 5). The voltage
between B and C must not be over 300 VAC.

3. F+ F- terminals connect to the generator field. (J
and K)

FEXT.VR is the potentiometer (1KΩ 1W). These two
terminals must be by-pass when external
potentiometer is needless.

P.S. : A, B, C, F+ F- the usage of wire gauge are

AWG16 or 1.25 mm2 85°C above 600V.

The EXT.VR connection wires must be made of
isolated wiring.

3. ADJUSTMENTS

The voltage setting for 220V/380V/440V and the
frequency setting for 50/60HZ is show in figure7.
Please check the voltage/frequency selector setting
is correct before start the generator.

CAUTION :

THE GENERATOR OR AVR MAY BE DAMAGED
IF THE VOLTAGE / FREQUENCY SELECTOR
SETTING IS INCORRECT.

UFRO DIP:
Close - please refer to solid curre in Figure8.
Open - please refer to dotted curre in Figure8.