Ea07 Manual en

EA07
Generator Automatic Voltage Regulator

Operation Manual
Suitable for Single or Three Phase Self Excited Brushless Generator

Compatible replacement for Mecc Alte SR-7
* Not a genuine Mecc Alte product.
Headquarters : 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
1. SUMMARY
EA07 is a self excited Analogue type Automatic
Voltage Regulator. The sensing and power inputs
are independent and accept power input from the
auxiliary winding. The wide voltage adjustment
range fulfills any voltage adjustment requirements.
The EA07 is equipped with adjustable under

frequency protection and adjustable over excitation
voltage protection for preventing generator from
over loading or over excitation.
Both protections status are indicated by two
individual LED when protection is activated. Also the
AVR has a built in EMI filter to prevent interference
to the generator.
2. SPECIFICATION
Sensing Input
Voltage
Power Input
Voltage
4, 5C
Range 90~350VAC
3A, 5
80 ~ 270V
1 phase 50/60Hz
1 phase 50/60Hz
Output F+, F
Voltage
Max. 63 VDC @ 220VAC
Current
Continuous 6A
Max. Intermittent 7A for 10 sec
Exciter Field DC Resistance
10 ~ 100 Ohm
Over Excitation Protection

40~Max VDC @ 0.3~20sec
Under Frequency Protection
Adjustable range 42 ~ 60 Hz
EMI Suppression
Internal electromagnetic interference filtering
Unit Power Dissipation
Max. 5 watt
Operating temperature
-40 ~ 65 C
Voltage Regulation
< 1% (with 4% engine governing)
Storage temperature
-40 ~ 80 C
Voltage Build-up
Residual voltage at AVR terminal > 5 VAC, 25Hz
External VR
100K ohm 1/2 watt 7%
Dimensions
97mm L * 92mm W * 39mm H
Weight
275g 2%
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. Use of such equipment could
damage the AVR.
High Temperature
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.
UNIT : mm
4. Fuse specification : 20mm 6.3A / 250V.

Outline and Drilling Diagram
Figure 1
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2
EA07
3. WIRING / ADJUSTMENTS
3.1 Field Excitation Wiring
3 F+, 1 F
Connect AVR terminal 3 to field +, connect
AVR terminal 1 to the field .
NOTE
The Exciter field resistance is between 10~
100 Ohm.
If field resistance is less than 10 Ohm when
generator is under full load and the field voltage is
under the maximum output, please series a
suitable wattage (W) resistor to have the overall
field resistance to equal to 10~ 100 Ohm.
3.2 Sensing Input

4, 5C
The rated sensing input range is 90 to 350VAC. If

the generator voltage is greater than the rated,
please connect through N (Neutral) to phase.
(Reference from Figure 2).
adjustment will cause voltage instability and over

adjusting will cause sudden overly voltage
variation under heavy load.
Analogue type multi voltmeter is suggested when
adjusting the voltage stability. Adjust the STAB
potentiometer until the pointer on the multi
voltmeter is oscillating to its minimal.
3.8 Circuit Protection

AMP. Over Excitation Protection Adjustment
(Overload protection).
Set the AMP Overload protection value according

to the generator maximum excitation voltage
(40~Max VDC). When over excitation occurs
maintain the status for a short period of time then
decrease the generator voltage down to residual
voltage. When the Over excitation protection is
activated the O/E LED will illuminate, the higher the
over excitation value is the shorter delay time
becomes. The generator will require stopping
operation to reset.
NOTE
3.3 Frequency Selection

6, 5A
When the terminals 6 & 5A on the AVR are bridged,

the system frequency is 60Hz. In the contrary, when
bridge is removed the system frequency is 50Hz.
When AMP potentiometer is adjusted fully

clockwise, the Over Excitation protection will
be disabled.
Hz. Is used to set the under frequency protection
Hz. Under Frequency Protection Adjustment
3.4 External Voltage Adjustment VR

7, 5B
Connect a 100K Ohm 1/2W voltage rheostat at VR

terminals to enable a 7% voltage adjustment from
rated voltage.
* The terminals must be bridged when the external
voltage adjustment function is none required.
knee point. When the generator frequency declines

to setting point, the generator voltage will also
decrease in the same time to prevent high excitation
current from damaging the AVR or the exciter.
Adjustment procedure
1. Start generator and let voltage build up.
3.5 Power Input

3A, 5
The Power input range is 80 to 270VAC, connecting

from either main winding or auxiliary winding.
3.6 VOLT. Voltage Adjustment

User can adjust the generator voltage by rotating
the VOLT potentiometer on the AVR. Rotate the
potentiometer clockwise to increase voltage and
decreasing when rotate counterclockwise. The
voltage adjust rate is less than 1% when the power
factor equals to 1 to 0.8 (PF 1 to 0.8) and frequency
variation within 6%.
3.7 STAB. Stability Adjustment
2. Adjust engine frequency to the appropriate low

frequency value.
3. Slowly adjust Hz. Potentiometer until the U/F LED
illuminates.
4. Finally adjust the engine frequency until the LED
is turned off.
4. OPERATION PROCEDURE
4.1 Please confirm the follow condition
before starting the generator :
Starting Setting
1. Confirm if the AVR specification conforms to the
system requirements ?
Slowly and precise adjustment of STAB

potentiometer can change the respond time
2. Confirm the AVR wiring ?
between the AVR and generator. Inadequate
______________________________________________________________________________________
EA07
3. Confirm correct frequency selected ?

4. Confirm the generator rated voltage with the AVR
sensing input ?
5. Adjust VOLT potentiometer fully counterclockwise?
Adjust STAB potentiometer to the center position?
Adjust AMP potentiometer fully clockwise?
4.2 Starting Generator

1. Reconfirm all setting and wiring.
ATTENTION
The AVR reading AC voltage are all average
value.
2. Start generator and adjust to rated frequency.
The first measured voltage value should be under
the rated voltage. If not, then reconfirm the start
setting.
3. Slowly adjust VOLT potentiometer to the rated
voltage, at this time the generator voltage may
become unstable. Adjust the STAB. potentiometer
anticlockwise, until the oscillation stabilizes. Over
adjustment may cause short oscillation when
load applied or load type varies.
SUGGESTION
Adjust the STAB. potentiometer to the
point where the oscillation occurs and then
adjust the potentiometer counterclockwise
by 1/6 of rotation.
4. If voltage can not be adjusted or to the rated
value, please check to see if the generator
frequency is too slow (Under frequency
protection activated). If residual voltage is below
5VAC, then please execute field flashing to help
build up the residual voltage.
Under over excitation

(Overload protection).
voltage
protection
4.3 Field Flashing

When the regulator is operated with the generator
for the first time, the polarity residual magnetism
may not correct or the magnitude not enough. If the
generator does not build-up after startup, shut down
the prime mover and proceed with the following
steps :
1. Stop generator operation, disconnect AVR + and
wirings then apply a DC source (Not grounded) of
not more than 12VDC, to generator F+ (Positive)
and F (Negative) in series with a limiting resistor
of 3 to 5 ohms 20 watt.
2. Allow approximately 3 seconds before removing
the dc source.
3. Start generator and measure residual voltage at
generator leads 3A, 5. If measured voltage is
greater then 5VAC please carefully reconnect all
AVR wirings. Please repeat field flashing
procedure if less than 5VAC residual voltage is
measured.
4. If residual voltage is greater than 5VAC, but AVR
still unable to build up voltage, please replace
with another AVR.
WARNING
Overly field flashing may damage the AVR or
generator excitation winding.
4.4 Maintenance
Regular maintenance to make sure the AVR surface
is clean and free from oil or moisture. All connection
terminals and wirings must be firmly tightened and
no signs of visible oxidation or erosion.
5. Make sure the generator and AVR are both under

normal operation conditions.
6. The voltage adjustable range should be 1%
under no load or full load. If the adjustable range
in not within such range, please check the below :
Generator under frequency (Lower than low
frequency protection knee point).
Severely deformed generator output wave
form.
Capacitive load over ratio (Power factor in
lead).
Change the AVR and restart.
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4
EA07
F+
F-
O/E U/F
EXCITER
AMP. HZ. STAB VOLT
EA07
10
9
12
OUT
IN
STATOR
11
Figure 2
Diagram
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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EA07

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EA07

Generator Automatic Voltage Regulator

Suitable for Single or Three Phase Self Excited Brushless Generator

The EA07 is equipped with adjustable under

Over Excitation Protection

3. Secure all wiring connection. Do not install

4. Fuse specification : 20mm 6.3A / 250V.

3.2 Sensing Input

The rated sensing input range is 90 to 350VAC. If

adjustment will cause voltage instability and over

3.8 Circuit Protection

Set the AMP Overload protection value according

3.3 Frequency Selection

When the terminals 6 & 5A on the AVR are bridged,

When AMP potentiometer is adjusted fully

Hz. Is used to set the under frequency protection

Hz. Under Frequency Protection Adjustment

3.4 External Voltage Adjustment VR

Connect a 100K Ohm 1/2W voltage rheostat at VR

knee point. When the generator frequency declines

3.5 Power Input

The Power input range is 80 to 270VAC, connecting

3.6 VOLT. Voltage Adjustment

3.7 STAB. Stability Adjustment

2. Adjust engine frequency to the appropriate low

Slowly and precise adjustment of STAB

3. Confirm correct frequency selected ?

4.2 Starting Generator

Under over excitation

4.3 Field Flashing

5. Make sure the generator and AVR are both under

AMP. HZ. STAB VOLT

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