EA05AF

Generator Automatic Voltage Regulator

Operation Manual

Self Excited Automatic Voltage Regulator

5 Amp AVR For Full Wave Generators

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 : service@mail.kutai.com.tw
 1. INTRODUCTION
Sensing & power Inpuut
Voltage 160 ~ 260 VAC, 1 phase2 wire External Volts Adjustmen
Frequency 50 / 60 Hz, selectable ± 10% with 5K ohm 1 watt trimmer

Output Unit Power Dissipation

Voltage Max. 170 VDC @ 240 VAC input Max. 8 watt
Current Continuous 5A
Intermittent 7A for 10 sec Under Frequency Protection (Factory Setting)
Resistance Min. 15 ohm Max. 100 ohm 60 Hz system presets knee point at 55 Hz
50 Hz system presets knee point at 45 Hz
Voltage Regulation
< ± 1% ( with 4% engine governing ) Soft Start Ramp Time
2 sec.
Voltage Build-up
Residual voltage at AVR terminal > 3 VAC Dimensions
150mm L * 100mm W * 74mm H
Thermal Drift
0.03% per °C change in AVR ambient Weight
421g ± 2%

2. WIRING (Refer to Fig4, Fig5) terminals.

7. Connect a 300VAC voltmeter to generator output
● Linked the generator field to F+ and F-.
voltage terminals.
● Linked sensing input to “AC”.
● Linked external trimmer to “Ext.VR” 3.3.2 Start the generator
● Selected 50Hz or 60 Hz system. 1. Start generator with no load. Adjust the speed at
correct position.
3. NOTE 2. Carefully turn volt trimmer clockwise until rated
3.1 Note before installation voltage is reached.
(Refer to Fig1) 3. Turn stability trimmer clockwise until the output
voltage is not stable, carefully turn stability
3.2 Note when generator running trimmer anticlockwise until rated stable voltage is
reached. That is the best match point between
● The temperature of AVR may be over 60°C when AVR and generator.
generator set is running.
● Please don’t touch the heat-sink there is a 4. ADJUSTMENT
warring mark, when generator set is running.
4.1 Under frequency adjustment
3.3 Procedure of generator running ● Linked “ COM ,50Hz ” terminals at 60Hz system,
open when 50Hz.
3.3.1 Setting
● Under frequency setting procedure, if necessary.
1. Check the connect wires are correct.
1. Start the generator set and the output voltage is
2. Check protect fuse is 15A 250V. normally.
3. Turn the volt trimmer fully anticlockwise. 2. Adjust the generator speed controller until under
4. Turn the external trimmer to midway position if frequency point is reached.
fitted.
5. Turn the stability trimmer fully anticlockwise.
6. Connect a 110VDC voltmeter to field F+, F-
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2 EA05AF
3. Carefully turn U/F trimmer until the U/F LED is down the Prime-mover and proceed with the following
illuminated. ( 50Hz is setting at 45Hz,60Hz is steps :
setting at 55Hz when outgoing ).
1. With the Prime-mover at rest and the regulator’s
4.2 Voltage adjustment field output wires disconnected, apply a DC
source ( NOT grounded ) of not more than 3~12
● Carefully turn volt trimmer until rated voltage is
Vdc with Positive to F+ and Negative to F-, in
reached.
series with a current-limiting resistor of 3~5 ohms
● Fitted a external VR 5000Ω 1 watt between 20 watt. (The set battery is a suitable source.)
“ Ext.VR ” terminal, if necessary.
2. Allow approximately 3 seconds before removing
4.3 Stability adjustment the DC source.

● Carefully turn stability trimmer until output voltage 3. With the voltage regulator disconnected ( wires 3
is stable. and 4 ), start the prime mover and measure the
“ residual ” voltage available at the auxiliary
winding. If this voltage is greater than 5 Vac,
5. FIELD FLASHING reconnect voltage regulator, and voltage build-up
When the regulator is operated with the generator for should be successful. If less than 5 Vac is
the first time, the polarity of residual magnetism may measured, repeat field flashing procedure.
be reversed or too small to achieve the necessary 4. If repeating steps a. and b. does not result in
build-up voltage for the regulator. If reversing the field generator voltage build-up, and residual is
connections does not induce build-up, and the residual greater than 5 Vac, replace voltage regulator.
voltage is less than the specified value of 5 Vac, shut

U/F Adjustment
STAB Stability Adjustment Outline dimension
Figure 1
VOLTS Volt Adjustment

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EA05AF 3
 120 120
GENERATOR OUTPUT VOLTAGE

GENERATOR OUTPUT VOLTAGE

100 100
( % OF MONINAL)

( % OF MONINAL)
80 80
50HZ
60HZ

60 60

40 40

20 20

0 10 20 30 40 50 60 0
1 2
FREQUENCY (HZ) SOFT START (V/Sec)
Frequency Compensation Curves Soft Start Curve
Figure 2 Figure 3

N N
R R
S GEN S GEN

T T

Field Field

Close 60Hz Close 60Hz

AC AC F+ F- VR Ext. AC AC F+ F- VR Ext.
Open 50Hz Open 50Hz
VR1 VR2 VR3

VR1 VR2 VR3

EA05AF EA05AF
PWR U/F

PWR U/F

FOR 380VAC FOR 220VAC

Figure 4 Figure 5

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