EA16
Generator Automatic Voltage Regulator
Operation Manual
Universal 16Amp Self Excited Automatic Voltage Regulator
for use in 220 / 380 / 440 / 480 VAC brushless generators
with paralleling compatibility
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1 EA16
1. SPECIFICATION
Sensing Input Analogue Voltage Input
Voltage 170 ~ 510 VAC, Single Phase 2 wires Max. ±5VDC. ±10% @ ±3VDC
Voltage is DIP Switch selectable
Over Excitation Protection
Frequency 50/60 Hz, DIP Switch selectable
Max Output DCV 95% 20Sec
Power Input
External Volts Adjustment
Voltage 60 ~ 300 VAC, Single Phase 2 wires
± 5% with 2K ohm 1 watt trimmer
Output
Unit Power Dissipation
Voltage Max. 90 VDC @ 240 VAC input
Max. 10 watt
Current Continuous 16A
Intermittent 20A for 10 sec Under Frequency Protection ( Factory Setting )
Resistance Min. 5 ohm 50/60 Hz DIP SW selectable
Voltage Regulation Soft Start Ramp Time
< ± 0.5% ( with 4% engine governing ) 2 sec.
Voltage Build-up Dimensions
Residual voltage at AVR terminal > 5 VAC 156mm L * 106mm W * 43mm H
Thermal Drift Weight
0.03% per °C change in AVR ambient 450g ± 2%
Load Current Compensation
1A or 5A Max. 7% @ PF0.5 DIP Switch Selectable
The EA16 AVR is an update of the EA15A AVR. It is similar to the original EA15A in power and voltage
sensing capabilities but with new enhanced paralleling functions; the user can now select the CT inputs either
1 & 5 Amp or use new A1 & A2 analogue signal inputs terminals for use with PLC paralleling controls. It has
new over-voltage excitation safety circuits to prevent damage caused by the accidental detachment of the
sensing wires or irregularities on the generator’s excitation circuits.
ATTENTION
1. AVR can be mounted directly on the engine,
genset, switchgear, control panel, or any position
that will not affects 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.
High Temperature
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. Fuse specification : 16A / 250V slow blow type.
5. Terminal："Fast-On" terminals 6.35mm (1/4 inch) &
UNIT : mm With 4mm crimping terminal.
Figure 1 Outline Drawing
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2 EA16
2. CONNECTION TERMINAL 2. DROOP：Select switch S1 or S2 pending on the
secondary current of the CT that you are using.
1. P1, P2 ： Power Input Terminals from 60 to Voltage droop works when the CT and the AVR
300VAC 50/60Hz -16A rated. senses that the output of the generator voltage
and current waveforms are out of synch and the
2. F+, F−：Maximum Output current 16A.
AVR droops the output voltage of the generator
3. VS1, VS2：Voltage sensing input terminals, Volts to correct it.
selected using DIP SW1 for 220V or 400V.
3. STAB：If the generator output voltage oscillate,
4. S1, S2：Load Current Compensation (Droop), CT adjusting the STAB potentiometer will stabilize
secondary current input selected by using DIP the output voltage, over adjustment will result in
SW 1A or 5A (If droop not used leave terminals high voltage variation when load is applied. Use
open). an analog type multimeter when making this
adjustment. Connect the meter to terminals F+
5. VR1, VR2：External Voltage trim use, 2K Ohms 1
and F− and slowly adjust STAB potentiometer to
watt trimmer for ±5% voltage adjustment. Keep
the point when the pointer stops moving.
terminals shorted when not in use.
4. VOLT：Move to set the generator output voltage.
6. A1, A2：Analogue Voltage Input terminals used
Set DIP Switch 1 to the generator working
for Power Factor correction from a external PLC-
voltage.
The PLC controls provides a DC voltage signal to
adjust the generator voltage. Max. Adjustment Set SW1 to OFF (220V) for use from 170 to 260V
range is ±5VDC. Keep terminals open when not Set SW1 to ON (400V) for use from 340 to 510V
used.
When using and external VR set it to the central
7. DIP Switch 1 to 4 position and adjust the AVR VOLT trim to the
SW1：OFF 220VAC (170 to 260VAC) rated voltage.
ON 400VAC (340 to 510VAC)
NOTE
SW2：OFF CT Secondary Input 1A
If the external VR is not used, short terminal
ON CT Secondary Input 5A VR1 and VR2.
SW3：OFF Generator Frequency 60Hz,
52 ~ 61Hz Adjustment 5. U/F：Under Frequency protection setting.
ON Generator Frequency 50Hz, At 60Hz U/F factory set at 55Hz
42 ~ 51Hz Adjustment At 50Hz U/F factory set at 45Hz
SW4：OFF Over excitation protection enabled To adjust the U/F setting, select the correct
ON Over excitation protection disabled system frequency, start engine and adjust engine
speed to the required U/F frequency (for
8. LED Indicator
example 55Hz or 45Hz), slow adjust U/F
U/F：Under Frequency Indicator potentiometer until the U/F red LED turn ON,
O/E：Over Excitation Indicator returning the engine speed to normal turn the
LED off.
3. ADJUSTMENT AND SETTING Function of the Under Frequency trim pot：
1. TRIM works together with a bias voltage applied ● During start up or shutdown, the engine speed
to terminals A1 and A2. This signal is supplies by changes going over or under its rated RPM (Hz).
an external Power Factor Paralleling PLC. Use This AVR has an Under Frequency circuit to
the TRIM potentiometer to adjust the DC voltage protect the AVR and exciter; you do not need to
input that controls the level of the generator’s disconnect the AVR when idling the engine.
output voltage. When set counter-clockwise the
control level is zero, and if moved clockwise the ● If load is higher than the generator’s capacity, the
maximum control range is 10%. The signal Under Frequency activates, reducing the
connected to A1 and A2 can be unipolar (0,+) or generator’s voltage preventing generator
bipolar (+,−). Check with the manufacture of the overload.
Paralleling control PLC.
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6. Over Excitation Protection： 3. Disconnect the AVR AC power input terminals
and restart the generator, re-measure the
● This AVR has over Excitation Protection
residual voltage. If this voltage is greater than
preventing the generator from working under
5VAC, reconnect voltage regulator, and voltage
unusually high excitation. Excitation Protection
build-up should be successful. If measured less
includes generator overload, accident removal of
than 5VAC, repeat steps 5.1 and 5.2.
sensing wires, and incorrect voltage setting.
When problems occur, the AVR will gradually 4. If repeating steps 5.1 and 5.2 does not result in
shutdown the excitation voltage to the minimum generator voltage build-up, and residual is
residual voltage. If the O/E LED turn ON and greater than 5VAC, replace with a new voltage
stays ON, you need to reset the AVR by shutting regulator.
the engine for 10 seconds. When working the
generator in parallel this protection is not required, CAUTION
the user can disable this function by placing the Over excite may damage the AVR or the
jumper from terminals JUMP 1 to 2. To reactivate exciter.
protection, place the jumper back to 2 and 3.
4. NOTICE OF USE
1. Installation Notice：(Refer to Figure 2 and 4).
● Only, a trained professional can Installation,
calibrate and inspections this AVR.
● Install this AVR inside the generator enclosure
away from moisture, corrosion and from any easy
to reach area.
2. Generator Operation Notice：
● During operation, the temperature on the surface
of the AVR can reach higher the 60 °C / 140°F.
● “DANGER” When the AVR is working never
touch or ground the heat sink on the AVR. The
AVR heat sink is an electrically live terminal.
A warning sticker is in place on top of the heat
sink.
5. FIELD FLASHING
When operating this AVR for the first time, the
polarity of the residual magnetism may be reversed
or too weak to achieve the necessary build-up on
the regulator. If reversing the field connections does
not induce build-up, and the residual voltage is less
than 5 VAC, shut down the Prime-mover and
proceed with the following steps：
1. Stop the generator and disconnect the field wires
(F+ and F−), apply a DC Voltage using a
batteries positive terminal to F+ and the negative
terminal to F−, using a current-limiting resistor of
3~5 ohms 20 watt.
2. Allow approximately 3 seconds before removing
the battery.
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4 EA16
R
R
GEN S
S
GEN T
T
N
N
Field
Field
P1 P2 F+ F- VS1 VS2 K L
P1 P2 F+ F- VS1 VS2 K L
EA16A EA16A
VR1 VR2 VR1 VR2 A1 A2
A1 A2
EXT. VR EXT. VR
S
Figure 3 220V Connection
GEN
T
R
N
GEN S
T
Field
N
P1 P2 F+ F- VS1 VS2 K L Field
EA16A
VR1 VR2 P1 P2 F+ F- VS1 VS2 K L
A1 A2
EA16A
VR1 VR2 A1 A2
EXT. VR
EXT. VR
Figure 2 Paralleling Connection Figure 4 380 / 480V Connection
Field
R
GEN S
Aux. N
Winding
60~300v
P1 P2 F+ F- VS1 VS2 K L
EA16
VR1 VR2 A1 A2
EXT. VR
Figure 5 Auxiliary Winding
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6. TROUBLE SHOOTING
SYMPTOM CAUSE CORRECTION
Voltage does not Residual voltage below 5VAC Reference from 5. Field Flashing
build up F+, F− polarity reversed F+ and F− reverse the connection
F+, F−, P1, P2, VS1, VS2 not Reference from Figure 3 and 4 connection
connected
Burnt fuse Change fuse 16A 250V
Ext. Switch (Breaker) not turned on Switch on (ON)
Engine RPM under speed Increase engine speed / frequency above25HZ
Out voltage low Poor adjustment is made Read start procedure carefully and adjust again
U/F protection activated Increase generator speed
U/F activated / Incorrect voltage Read user’s manual to select correct voltage
selection
Out voltage high Poor adjustment is made Read start procedure carefully and adjust again
Incorrect voltage selection Read user’s manual to select correct voltage
Out voltage instable Poor adjustment is made Read start procedure carefully and adjust again
Field voltage requirement lower Inquire our distributor to solve
the rang of regulator
※ Use only original supplied spare protection fuse for fuse replacement.
※ Please accept our sincere apology if any modification in performance, specification or appearance is
made without prior notice.
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