Kutai electronics EA125-8 User manual

KUTAI ELECTRONICS INDUSTRY CO., LTD.
TEL : [phone] FAX : [phone] Website : www.kutai.com.tw
Headquarters : No.3, Lane 201, Chien Fu St., Chyan Jenn Dist., Kaohsiung 80664, TAIWAN
EA125-8
Generator Automatic Voltage Regulator
Operation Manual
Self Excited Automatic Voltage Regulator

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2EA125-8
130.0
150.0
135.0 115.0
21.5
F+ S2
F- S1
P2P1P0
VR VRA2A1C2C1
2 ON 5A
2 OFF 1A
1 OFF 220
1 ON 440 3 OFF 50Hz
3 ON 60Hz Stab Volt DroopU/F Trim U/F
47
SECTION 1 : SPECIFICATION
Sensing Input (S1, S2)
Static Power Dissipation
Voltage 220/440 Vac, 1 phase
Max.12 watts
175 270 Vac @ 220 Vac
350 540 Vac @ 440 Vac
Quadrature Droop Input (C1, C2)
Frequency 50/60 Hz, SW1 selectable
CT 5A or 1A greater than 5VA, SW2 selectable
Max. +/- 7% @ P.F +/- 0.7
Power Input (P1, P2)
Voltage 30 260 Vac, 1 phase
Analogue Voltage Input
Frequency 40 500 Hz
Un 0 10% @ 0 10 Vdc
Excitation Output
Under Frequency Protection (Factory Presets)
Voltage Max. 85 Vdc @ power input 110 Vac
50/60 Hz, SW3 Selectable
Max. 170 Vdc @ power input 220 Vac
42 50 Hz @ 50 Hz Preset 45 Hz
Current Continuous 8A
51 60 Hz @ 60 Hz Preset 55 Hz
Intermittent 40A for 60 secs.
Resistance Max. 9 ohms
Voltage Thermal Drift
Fuse Spec. Slow blow 5 x 20mm 8A / 250V
Less than 3% at temperature range -40 to +70 ˚C
External Voltage Adjustment
Environment
Max. +/- 5% @ 1K ohm 0.5 watt potentiometer
Operating Temperature -40 to +70 ˚C
Max. +/- 10% @ 3K ohms 0.5 watt potentiometer
Storage Temperature -40 to +85 ˚C
Relative Humidity Max. 95%
Voltage Regulation
Vibration 3 Gs @ 100 2K Hz
Less than +/- 0.5% ( with 4% engine governing )
Dimensions
Build Up Voltage
135.0 (L) x 150.0 (W) x 47.0 (H) mm
5 Vac 25 Hz residual volts at power input terminal
Weight
Typical System Response
500 g +/- 2%
Less than 1 Cycle
Figure 1 Outline Drawing
ATTENTION
1. AVR can be mounted directly on the engine,
genset, switchgear, control panel, or any
position that will not affect operation. For
dimension reference, please see Figure 1.
2. All voltage readings are to be taken with an
average-reading voltmeter Meggers and
high-potential test equipment must not be used.
Use of such equipment could damage the AVR.
3. Secure all wiring connection. Do not install AVR
at a place with high vibrations to prevent loose
connections. For safety do not touch the heat
sink while in operation.
4. Terminal：“Fast-On” terminals 6.35mm (1/4 inch)
& With 4mm crimping terminal.
5. Improper setting of under-frequency
protection could cause the output voltage of
the unit to drop or become unstable under
with changes in load. Avoid making any
changes to the U/F setting unless necessary.
Unit : mm

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EA125-8 3
SECTION 2 : DIP SWITCHADJUSTMENT (SW)
2.1 SW1 Voltage Selection
SW1 is to select the suitable genset sensing input
voltage (S1, S2). When sensing input is 440 Vac (380 
480) Switch the SW1 to ON. If the sensing input is 220
Vac please switch SW1 to off position. (Please
Reference from Figure 2).
ATTENTION
If system voltage is 220V but the SW1 is setting at
“ON” (440V) then it will cause genset over voltage
and sever damage.
SW
12 3 45 6
ON
SW
Figure 2 DIP Switch (SW)
2.2 SW2 C.T. Current Compensation
SW2 is to select the suitable C.T. Current transformer
current input ( C1, C2 ) If C.T. Current is 5A then
please switch SW2 to ON. If C.T. Current is 1A then
please switch SW2 to OFF position.
2.3 SW3 Frequency Selection
If genset rated frequency is 60 Hz please switch SW3
to ON position and switch to OFF position is rated
frequency is 50 Hz.
ATTENTION
If the frequency 60 Hz is selected while the
generator rated frequency is 50 Hz then it may
result in under voltage. If a 60 Hz generator is
selected at 50 Hz, when executing engine stop,
the over excitation current may damage then AVR
and generator.
2.4 SW4, 5, 6 Genset Capacity Selection
If genset capacity is below 90 KW please switch SW4,
5, 6 to OFF position.
If capacity is 90 200 KW please switch SW4 to ON
position and 5, 6 remain in OFF position.
If capacity is greater than 200 KW please switch SW4,
5, 6 to ON position.
ATTENTION
Each time when SW4, 5, 6 position is changed,
the STAB (stability) must be readjusted to
achieve the optimum genset performance. The
setting of the DIP switches SW must be
conducted while the generator is not in
operation.
3. ADJUSTMENT
3.1 VOLT
●Voltage setting adjusting the genset rated output
voltage.
●When SW1 is “OFF”(220V) adjustable range is 175
270 Vac.
●When SW1 is “ON”(440V) adjustable range is 350 
540 Vac.
ATTENTION
AVR AC voltage readings are all average value.
●External VR：Connect 1K ohm 0.5W VR to the VR
terminal, the adjustable voltage range = +/- 5%Un,
3K ohms 0.5W adjustable voltage range = +/-
10%Un.
●If this function is not required, please short circuit the
two terminals.
3.2 STAB
Stability adjustment. Correct stability adjustment must
be conducted while the generator is operating without
load, firstly adjust the STAB potentiometer (POT)
clockwise until voltage becomes unstable, and then
slightly adjust anti-clockwise. (approximately 1/5 of
rotation). When the voltage just reaches the critical
point (knee point) of stabilization. Where the voltage is
stable yet very close to become unstable.
3.3 U/F
Under frequency protection adjustment. When
generator frequency falls below the knee point, the
under frequency protection circuit will begin to
intervene and voltage and frequency begin to decrease
in linear descend. Coordinate with the DIP switch SW3
frequency selection 50/60 Hz.
When selecting 50 Hz the adjustable range is from 42
to 50Hz and the factory presets at 45 Hz.
When selecting 60 Hz the adjustable range is from 51
to 60Hz and the factory presets at 55 Hz.

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4EA125-8
3.4 U / FL
When under frequency protection is activated, the RED
LED will light up.
3.5 DROOP
Droop adjustment. When paralleling, the AVR
compensate the input rating and voltage shifting basis
on load current, through internal circuit calculation and
increase or decrease the voltage. When phase current
lag the voltage, it decreases original voltage setting
and if the phase current lead the voltage then it
increases the original voltage setting. The increase and
decrease range can be preset by the DROOP
adjustment.
3.6 TRIM
Analogue voltage Input sensitivity. When terminal A1
and A2 is added with a DC input (0 10V), the TRIM is
used to adjust the influence level from the DC input to
the rated voltage. If the TRIM potential (POT) is
adjusted fully counter-clockwise, and then the
additional signal will not cause any influence. On the
contrary if the TRIM is adjusted fully clockwise, then
the additional signal will produce a maximum effect.
SECTION 4 : CONNECTION TERMINAL
4.1 P0, P1, P2：Fundamental / Harmonic / PMG
power input. (Input range 30 260 Vac, 40 500
Hz, 3 phase).(See Figure 3)
Connect to P1, P2 power input for 1 phase. (See
Figure 4 and 5)
4.2 F+, F-：Excitation output. Connect to generator
excitation winding.
4.3 VR：External voltage adjustment. Use an 1K ohm
0.5 watt VR (Voltage adjustable range +/- 5%),
3K ohms 0.5 watt VR (Voltage adjustable range
+/- 10%), If this function is not required, please
short circuit the two terminals.
4.4 C1, C2：Load current compensation. Input range
1A or 5A( Selected by SW2 ) greater than 0.2VA.
4.5 S1, S2：Sensing Input. Input range 220 or 440
Vac ( Selected by SW1 ) Input resistance greater
than 2M ohms.
4.6 A1, A2：Analogue voltage Input terminal.
WARNING
Please make sure you have read and understand
the contents of the instruction manual prior to
installation. Incorrect wiring connection may
result in irreversible damage to the product and
other equipments.
This Automatic Voltage Regulator is not equipped
with loss-Sensing Protection function / Over
Excitation Protection. An additional Over-Voltage
Protection device for load may be required to
avoid possible damage to the equipment or
severe personal injury or death.
F+ S2 F- S1 P2P1P0
VR VRA2A1C2C1
Stab Volt DroopU/F Trim U/F
ADJUST
EXT. VOLTS
F- FIELD
1K ohm
F+
W
N
C.T.
V
U
PMG
Analogue Voltage Input
PMG Wiring Diagram
Figure 3

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EA125-8 5
F+ S2 F- S1 P2P1P0
VR VRA2A1C2C1
Stab Volt DroopU/F Trim U/F
ADJUST
EXT. VOLTS
F- FIELD
1K ohm
F+
W
N
C.T.
V
U
Auxiliary
winding
Harmonics
Analogue Voltage Input
F+ S2F- S1P2P1P0
VR VRA2A1C2C1
Stab Volt DroopU/F Trim U/F
ADJUST
EXT. VOLTS
F- FIELD
1K ohm
F+
W
N
C.T.
V
U
Auxiliary
winding
Harmonics
Analogue Voltage Input
Harmonic / Fundamental
Auxiliary Winding Wiring
Connection
Figure 4
Fundamental Wiring
Connection
Figure 5