ENGGA EVC600i User manual

OPERATING MANUAL FOR AUTOMATIC VOLTAGE REGULATOR
MODEL NO : EVC600i
1. INTRODUCTION
2. ENVIRONMENTAL
3. TECHNICAL SPECIFICATION
The EVC600i Voltage Regulator is thyristor base to control the DC exciter field power of conventional
50 or 60 Hz brushless generators. The AVR circuitry includes under speed and over load protection
features. Excitation power is derived directly from the generator terminals.
-30 to 80°C (-22 to 176°F)
-40 to 80°C (-40 to 176°F)
Less than 2600 meter
<90%
2.1. Operating temperature:
2.2. Storage temperature:
2.3. ALTITUDE:
2.4. RELATIVE HUMIDITY:
Sensing Input
Power Input
Voltage Adjust Range
Field Resistance
Voltage Regulation
Output Voltage
Output Current
Terminal V -V for 220 Vac
Terminal V -V for 400 Vac
Voltage: 180 to 250 Vac
Frequency: 50 Hz or 60 Hz
180 - 300 Vac, 300 - 520 Vac
Recommend 9 - 24
< 1%
Maximum 90 Vdc @ 220 Vac
Maximum continuous: 8 A @ 220 Vac
10 second forcing: 10 A @ 220 Vac
0 220
0 380
Ω
±
Paralleling
Voltage Buildup
External Volts Adjustment
Thermal Drift
Analog Voltage Input
Current Compensation
Dimensions
Weight
Internal burden and adjustment for 0 to 10%
droop at 5 A, 0.8 PF, (from external CT)
4Vac, 30 Hz
At least 10% with 100k ohm 1 watt trimmer
0.05% per Degree C change in AVR ambient
In : 5A Input
At least 10 % @ P.F. = 0.8
175 mm L x 129 mm W x 37.5 mm H
530 10g
±
±5VDC, adjustable output voltage is no less than
2% for 1VDC (i.e. for ±5VDC it come out to be
±10%)
±
EVC600i
Generator Automatic Voltage Regulator
Operation Manual
Page 1 of 7 Updated 26Jan 2015

OPERATING MANUAL FOR AUTOMATIC VOLTAGE REGULATOR
MODEL NO : EVC600i
4. MECHANICAL SPECIFICATION
DRAWING
Page 2 of 7
SW1: ON - Increase in Response Time.
OFF - Response as per STAB pot Set
SW2: ON - 60 HZ
OFF -50 HZ
1
2
175 mm
129 mm
143 mm
104 mm
X1
X2
F-
F+
V220
V380
VR
A2
A1
S2
S1
1
VR2
O/L O/L LED
FUSE 8 Amps
V0
4 X 4.4 mm
X1
X2
F-F+
V220
V380
37.5mm
H
V0
175 mm
129 mm
143 mm
104 mm
ENGGA
DROOP UFRO
TRIM STAB VOLT
www.engga.com.cn
Model EVC600i
Sensing Input V - V for 220 Vac , 180 to 250Vac, 50/60Hz
0 220
V - V for 400 Vac , 350 to 480Vac, 50/60Hz
Power Input 180 to 250Vac, 50/60 Hz, 1
Output 90Vdc , 8A
0 380
:
:
:
:
Figure 1. Outline Drawing
Figure 2. The Drawing For Trimmer
Updated 26Jan 2015

OPERATING MANUAL FOR AUTOMATIC VOLTAGE REGULATOR
MODEL NO : EVC600i
AVR can be mounted directly on the generator, switchgear or control panel that conforms to the
mounting specification.
All voltage readings are to be taken with an average-reading voltmeter. Meggers and high-potential test
equipment must not be used with AVR connected to generator. Use of such equipment could damage
the AVR.
5. WIRING
1. V - V - V : Sensing Input Voltage.
output voltage 220Vac
output voltage 400Vac
2. F+. F- : Excitation Output
3. Power Input:
For 400 Vac system
For 220 Vac system
4. S1 - S2:
0 220 380
Sensing Input is between & (220Vac) or
(400VAC). For 2 Phase sensing one phase is
connected to terminal of AVR and second
phase is connected to or as explained
below:-
- For generator , connect
sensing phase to terminal .
- For generator , connect
sensing phase to terminal .
The sensing should be connected “Line to Line”
from generator output. Refer Figure 3 & 4.
.
Connect the brushless exciter field to terminals F+
and F-. Be sure to observe polarity.
AVR power input is between X1
& V0. X1 is connected to
Neutral of generator & V0 to V Phase of generator.
, X1 is connected to U Phase
& V0 toV Phase of generator. Refer to Figure
3 & 4.
Current compensation input.
Current Transformer(CT) secondary current = 5A,
0.8 PF.
V V
V
V
V V
V
V
0 220
380
0
220 380
220
380
External Voltage Adjustment.
If an external voltage adjust control is being used,
connect a 100 K / 1 watt potentiometer to
terminals and as shown in Figure 3 & 4.
If not in use then let VR1 & VR2 left open.
: Analog Voltage Input.
Fully isolated analog voltage from PF controller or
any other type of Digital (PLC) controller can be
injected into AVR for variation of generator output
voltage. Analog voltage range is ± 5VDC maximum
and can be connected to A1 & A2 terminals for
at least 10 % variation in terminal voltage.
When 60Hz operation, AVR response
time needs to be reduced. For that turn ON Switch1
so that extra fixed response time is now added with
STAB POT setting such that no over or under shoot
of voltage occurs during loading-unloading of
generator at 60Hz.
: When 50Hz operation, no need to
decrease response time as STAB POT setting is
proper for optimum stability of generator with
minimum over-under shoot of Voltage during
loading - unloading of generator.
For 60 Hz operation of UFRO
For 50 Hz operation of UFRO
5. VR1 - VR2:
VR1 VR2
6. A1 - A2
7. DIP SWITCH:
a) SW1 - ON:
SW1 - OFF
b) SW2 - ON:
SW2 - OFF:
6. ADJUSTMENT
All trimmer build in back of the AVR board, except
the Trimmer. The trimmers include
as shown in Figure
2. For Trimmer refer to Figure 1
The generator output can be altered by
adjustment of the trimmer on the AVR board,
or by the external trimmer (100K ohm 1W) if fitted.
a) The terminals and must be left
unconnected if no hand trimmer is required.
O/L DROOP,
TRIM, UFRO, STAB and VOLT
O/L
1. VOLT: Voltage Adjustment.
VOLT
Vset is factory set for 400 Vac , If Vset is
disturbed and set value is not known then
proceed as below :
VR1 VR2
.
Connect a voltmeter to generator output voltage
terminals.
d) Start the generator set and run on no load at
nominal frequency 50 - 53 Hz or 60 - 63 Hz.
e) If the red Led is illuminated, refer to the under
frequency roll off adjustment.
f) Carefully turn volt trimmer clockwise until
required voltage is reached.
Stability Pot is factory set for optimum performance
& is advisable not to disturb. But if required then
with the generator in ON Condition, rotate STAB
POT clockwise direction till voltage start oscillating
fast.
b) Before starting the generator, please turn the
trimmer on the AVR board fully anti-
clockwise.
c)
VOLT
2. STAB: Stability Adjustment.
Page 3 of 7 Updated 26Jan 2015

OPERATING MANUAL FOR AUTOMATIC VOLTAGE REGULATOR
MODEL NO : EVC600i
Page 4 of 7
then after 20 seconds AVR cuts off field voltage and
generator voltage is shut off. O/L LED continues to
light indicating O/L Trip. Adjustable from 0.1Amp to
8Amp DC. When O/L POT is fully anticlockwise is
minimum setting and fully clockwise is maximum.
Internal delay timer is fixed and delay time is 20
seconds ±1%. Factory set is 8 Amps DC.
To operationally test any EVC600i, refer to Figure 5
and perform the following steps:
a. Connect the voltage regulator as shown in Figure
5 and apply 230 Vac 50 Hz.
b. Adjust the rear panel trimmer fully
clockwise (CW).
RESULT: Observe that the lamp lights up full.
c. Adjust the rear panel trimmer fully counter-
clockwise (CCW).
RESULT: Observe that the lamp is not lit.
d. Adjust the rear panel trimmer until the
lamp just goes out.
Regulator operation is satisfactory if the above
results are obtained. Stability, however must be
tested with the generator and regulator operating.
OPERATIONAL TEST
VOLT
VOLT
VOLT
From this position, rotate STAB POT anti-
clockwise direction till voltage is stable. Load the
generator and check for stable voltage and if not
then rotate more towards anticlockwise till voltage
is stable.
The EVC600i under frequency adjust is factory
preset to cause voltage drop in the generator
line voltage when the frequency is between 56.8
and 57.2 Hz for 60 Hz applications. For 50 Hz
applications, the frequency roll-off is factory preset
to between 46.8 and 47.2 Hz.
To reset the frequency roll-off, proceed as follows:
a. Adjust the prime mover RPM to the desired
frequency compensation (corner frequency roll-off)
point.
b. If UFRO LED is ON adjust the back panel
trimmer anticlock wise to just OFF the LED
If UFRO LED is OFF then adjust UFRO trimmer
clockwise to turn ON LED and then anticlockwise
to just turn it OFF.
c. Bring the prime mover up to rated speed. The
output voltage should return to set level.
Generator intended for parallel are fitted with a
quadrature droop CT which provides a power
factor dependent signal for the AVR. The CT
connected to and of AVR. CT with secondary
N:5A is required to provide at least 10% droop at
0.8 PF. Percentage of droop required can be
adjusted using DROOP POT in the range of 0 to
10%. Fully anticlockwise is 0% and fully clockwise
is maximum as per CT current and load power
factory.Factory set is 0% so that mostly during solo
operation there is no droop in terminal voltage.
Trim Pot is used to decrease the effect of analog
input voltage on generator output voltage. When
set fully anticlockwise, there is no variation in
generator voltage on application of DC voltage On
A1-A2 Fully clockwise has maximum effect. Thus
using this POT we can get intermediate percentage
variation of the full scale i.e 0 to 10% at ± 5VDC.
.
Over load protection provides protection to
generator against overloading. It is based on field
current when field current increase above set value
(which is set using O/L POT), internal timer starts
and if overloading condition continues for 20 seconds
3. UFRO: Frequency Roll-Off Adjustment.
UFRO
4. DROOP: Droop Adjustment.
S1 S2
5. TRIM: Analog Voltage Input Adjustment.
6. O/L : Over Load Protection
Updated 26Jan 2015

OPERATING MANUAL FOR AUTOMATIC VOLTAGE REGULATOR
MODEL NO : EVC600i
X2 F- F+ V220 V380
VR
A2
A1
S2
S1
1
VR2
2
1
FUSE 8 Amps
Exciter
Field
+
-
Armature Stator Wire
W
N
V
U
+ 5 Vdc
-
CT
5A
IN :
100K/1W
V0
X1
Figure 3. Connection Diagram for 400 Vac Operation
Page 5 of 7
Note : All doted lines are optional connections.
SW1: ON - Increase in Response Time.
OFF - Response as per STAB pot Set
SW2: ON - 60 HZ
OFF -50 HZ
O/L
O/L
LED
Updated 26Jan 2015

OPERATING MANUAL FOR AUTOMATIC VOLTAGE REGULATOR
MODEL NO : EVC600i
X2 F- F+ V220 V380
VR
A2
A1
S2
S1
1
VR2
2
1
FUSE 8 Amps
Exciter
Field
+
-
Armature Stator Wire
W
V
U
+ 5 Vdc
-
CT
5A
IN :
100K/1W
V0
X1
Figure 4. Connection Diagram for 200 Vac Operation
Page 6 of 7
O/L
O/L
LED
Note : All doted lines are optional connections.
SW1: ON - Increase in Response Time.
OFF - Response as per STAB pot Set
SW2: ON - 60 HZ
OFF -50 HZ
Updated 26Jan 2015

OPERATING MANUAL FOR AUTOMATIC VOLTAGE REGULATOR
MODEL NO : EVC600i
Figure 5. Operational Test
Page 7 of 7
X2 F- F+ V220 V380
VR
A2
A1
S2
S1
1
VR2
2
1
FUSE 8 Amps
V0
X1
220V100W
LAMP
230Vac/50Hz
O/LO/L
LED
Note : All doted lines are optional connections.
SW1: ON - Increase in Response Time.
OFF - Response as per STAB pot Set
SW2: ON - 60 HZ
OFF -50 HZ
Updated 26Jan 2015