ENGGA EVC300i User manual

OPERATING MANUAL FOR AUTOMATIC VOLTAGE REGULATOR
MODEL NO : EVC300i
1. INTRODUCTION
2. ENVIRONMENTAL
3. TECHNOLOGY SPECIFICATION
The EVC300i 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 2800 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
< 1%
Maximum 90 Vdc @ 240 Vac
Maximum continuous: 6.3 A @ 240 Vac
10 second forcing: 10 A @ 240 Vac
220
380
Recommend 9 - 24
±
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 1 A, 0.8 PF, (from external CT)
4Vac, 30 Hz
At least 10% with 100k ohm 1 watt trimmer
0.05% per ‘C’change in AVR ambient
In : 1A Input
Not Less than 10 % @ P.F. = 0.8
122 mm L x 93 mm W x 38 mm H
300 10g
±
±5VDC, adjustable output voltage is no less than
2% for 1VDC (i.e. for ±5VDC it come out to be
±10%)
±
EVC300i
Generator Automatic Voltage Regulator
Operation Manual
Page 1 of 7 Updated on 02 Feb2015

Updated on 02 Feb2015
122 mm
93 mm
80 mm
108 mm
VOLT STAB UFRO DROOP
ENGGA
www.engga.com.cn
Sensing Input : V - V220 for 220Vac , 180 to 250Vac, 50/60 Hz
V - V380 for 400Vac , 350 to 480Vac, 50/60 Hz
Power Input : 180 to 250Vac, 50/60Hz, 1
Output : 90 Vdc,6A
EVC300i
Figure 1. Outline Drawing
OPERATING MANUAL FOR AUTOMATIC VOLTAGE REGULATOR
MODEL NO : EVC300i
Page 2 of 7
4. MECHANICAL SPECIFICATION
DRAWING
S 1 ON - Increase in
Response Time.
OFF - Response as per
STAB pot Set
:
SW : ON - 60 HZ
OFF - 50 HZ
2
122 mm
93 mm
108 mm
80 mm
S1S2 VR VR V380 N
V220 V F+ F-
2 1
A-
A+
2 X 4.4 mm
1
2
O/L
LED
O/L
POT
TRIM
UFRO LED
FUSE 6.3 Amps
38 mm
U
U
U
F+
V
V380 VR1
S1
S2
VR2
V220 NF-
H
Figure 2. The Drawing For Trimmer
ON
W

OPERATING MANUAL FOR AUTOMATIC VOLTAGE REGULATOR
MODEL NO : EVC300i
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.
V
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:
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 N
& V. N is connected to
Neutral of generator & V to V Phase of generator.
, N is connected to U Phase
& V to V Phase of generator. Refer to Figure
3 & 4.
Current compensation input.
Current Transformer(CT) secondary current = 1A,
0.8 PF.
V V
V
V
V V
V
V
220
380
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 is 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 A+ & A- 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. A+ & A-
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 and Trimmer. The trimmers include
as shown in
Figure 2. For Trimmer and 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 TRIM
DROOP, UFRO, STAB and VOLT
O/L TRIM
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 rated
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 on 02 Feb2015

OPERATING MANUAL FOR AUTOMATIC VOLTAGE REGULATOR
MODEL NO : EVC300i
Page 4 of 7
value (which is set using O/L POT), internal timer
starts and if overloading condition continues for 20
seconds 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 7Amp 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%
To operationally test any EVC300i, 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 EVC300i 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:1A is required to provide minimum
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
A+ & A- Fully clockwise has maximum effect. Thus
using this POT we can get intermediate
percentage variation of the full scale - 10% at
± 5VDC.
.
Over load protection provides protection to
generator against overloading. It is based on field
current when field current increase above set
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 on 02 Feb2015

Figure 3. Connection Diagram for 400 Vac Operation
OPERATING MANUAL FOR AUTOMATIC VOLTAGE REGULATOR
MODEL NO : EVC300i
Page 5 of 7
S1 S2VRVR
V380
NV220
V
F+F- 21
Exciter
Field
+
-
Armature Stator Wire
100K/1W
+ 5 Vdc Analogue Input
CT
1A
1
2
W
N
V
U
-
IN :
A+A-
FUSE 6.3 Amps
O/L LED
O/L POT
TRIM
ON
SW : ON - 60 HZ
OFF -50 HZ
.2
SW1 ON - Increase in
Response Time.
OFF - Response as per
STAB pot Set
:
Note : All doted lines are optional connections.
Updated on 02 Feb2015
UFRO LED

Figure 4. Connection Diagram for 200 Vac Operation
OPERATING MANUAL FOR AUTOMATIC VOLTAGE REGULATOR
MODEL NO : EVC300i
Page 6 of 7
S1 S2VRVR
V380
NV220
V
F+F- 21
A+A-
Exciter
Field
+
-
Armature Stator Wire
+/- 5 Vdc Analogue Input
W
V
U
CT
1A
IN :
100K/1W
SW : ON - 60 HZ
OFF -50 HZ
.2
SW1 ON - Increase in
Response Time.
OFF - Response as per
STAB pot Set
:
FUSE 6.3 Amps
O/L LED
O/L POT
TRIM
ON
1
2
Note : All doted lines are optional connections.
Updated on 02 Feb2015
UFRO LED

UFRO LED
Figure 5. Operational Test
OPERATING MANUAL FOR AUTOMATIC VOLTAGE REGULATOR
MODEL NO : EVC300i
Page 7 of 7
S1 S2VRVR
V380
NV220
V
F+F- 21
220V100W
LAMP
230Vac/50Hz
A+A-
FUSE 6.3 Amps
O/L LED
O/L POT
TRIM
SW : ON - 60 HZ
OFF -50 HZ
.2
SW1 ON - Increase in
Response Time.
OFF - Response as per
STAB pot Set
:
ON
1
2
Updated on 02 Feb2015