Self Excited Automatic Voltage Regulator

Compatible withLeroy Somer R230*

* Use for reference only and not a genuine Leroy Somer product
 1. INTRODUCTION
Sensing Input External Volts Adjustment
Voltage 120 VAC ( 90 ~ 140 VAC) ±5% with 1K ohm 1/2 watt trimmer
1 phase 2 wire 50/60 Hz
EMI Suppression
Output Internal electromagnetic interference filtering
Voltage Max. 100 VDC @ 120 VAC input
Unit Power Dissipation
Current Continuous 8A
Max. 6 watt
Intermittent 10A for 10 sec
Resistance Min. 15 ohm Under Frequency Protection
Knee point 47 ~ 57 Hz (adjustable)
Voltage Regulation
< ± 1% ( with 4% engine governing ) Dimensions
140mm L * 75mm W * 51mm H
Voltage Build-up
Residual voltage at AVR terminal > 5 VAC Weight
310g ± 2%
Thermal Drift
0.03% per °C change in AVR ambient

110V 0V E+ E _

8A
FUSE

OUTLINE / DIMENSION
Place the EA230 inside of the
generator, in a moisture-
proof and anticorrosive space.
The Outline and Drilling Diagram see
Figure 1
VOLT
Connecting Terminal ： "Fast-On"
STAB terminals 6.35mm (1/4 inch).
U/F

VR HZ

UNIT : mm

Figure 1 Outline Diagram

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2 EA230
2. WIRING
2.1 Operation NOTE
All voltage readings are to be taken with an
The following system operation procedures provide
average reading voltmeter.
instructions for adjusting the EA230 voltage
regulator. Symptoms resulting from a faulty
regulator and certain generator system problems 2. Start prime mover and bring up to rated speed.
are included, together with suggested remedies.
RESULT :
2.2 WIRING (Refer to Fig2, 3)
Voltage should build up. If not, perform Field Flashing.
1. Connect E+1, E- to Generator field
3. Slowly adjust the regulator“ VOLT” CW until
2. Connect the sensing port at 100V, 0V
the generator output voltage reaches the nominal
3. External voltage regulator is as Figure 2, 3 value. If used, adjust the remote “ VOLT” to
set the generator voltage to the exact value
Complete the following steps before proceeding with desired.
the system start-up.
RESULT:
CAUTION
Voltage should build up to rated value. If voltage does
Meggers and high potential test equipment not build up to the rated value, check generator for
must not be used. Incorrect use of such short or excessive load.
equipment could damage the semiconductors
contained in the regulator. 4. Check regulator under normal operating and
loading conditions.
2.3 Preliminarty Set-Up RESULT:
1. Verify that the voltage regulator specifications Voltage regulation should be better than ±1.0%
conform with the generator system requirements. no-load to full-load. If regulation is not within this range,
2. Ensure the voltage regulator is correctly perform the following steps :
connected to the generator system.
Voltage reduction under load may be due to
3. Install the correct fuse (8A / 250V) to prevent speed change from no load to full load. causing
damage caused from short circuit. the frequency compensation (V/Hz) circuit to
4. Set the regulator “VOLT” and external “VOLT reduce voltage at lower frequencies.
ADJ” ( if used ) as follows: Replace voltage regulator.
Regulator “VOLT ” : Fully CCW
2.5 Operational Test
Remote “VOLT ” : Centered
1. Connect the test setup as shown in the following
5. Adjust the front panel STAB control that controls figure, Operational Test. Do not apply power.
the system stability. Rotation of the front panel Ensure that the light bulb is rated for 120V and is
STAB control in the counter-clockwise (CCW) less than 100W.
direction will speed up response time and if over 2. Adjust the regulator “ VOLT” and/or remote
rotated in CCW direction, the generator voltage “ VOLT” to maximum CW
may oscillate (hunt).
3. Apply 120V, 50/60 Hz power to the regulator. The
6. Rotated the front panel STAB control CCW until light bulb should illuminate
the system start oscillating and then rotate CW
just past the point where oscillation occurred. 4. Slowly adjust the regulator “ VOLT” control
CCW. At the regulation point, the light bulb should
2.4 System Start-Up extinguish.

1. Perform preliminary set-up as described in the

above paragraphs.

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EA230 3
 R
S
T
T
N S

EXTERNAL
EXTERNAL VOLT. ADJ.
VOLT. ADJ. RHEOSTAT Open 60Hz
RHEOSTAT Open 60Hz 1K 0.5W Close 50Hz
1K 0.5W Close 50Hz EXC.
EXC. FIELD
FIELD

110V 0V E+ E-
110V 0V E+ E-
VR VR HZ HZ
VR VR HZ HZ EA230
EA230

Interconnection Diagram, 120 /208 V Nominal, Interconnection Diagram, 120 /240 V Nominal,
3-phase, 4-Wire, Wye Connection 1-phase, 3-Wire
Figure 2 Figure 3

FIELD

Test Circuit

Figure 4

If the step above can’t make the AVR work

please contact with us.

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4 EA230