OPERATION & INSTRUCTION MANUAL

MODEL- GB-VI-3L-12

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 IMPORTANT
 Read the manual carefully before the device is installed.

 Connect the relay as per the wiring diagram in the manual.

 Before connecting the relay check the supply voltage.

 Please check whether the C.T. is connected at the Main Incomer.

 Connect the C.T. when the relay is in OFF condition. Use suitable size cable for the C.T.

 Do not disturb the connection when the relay is ON.

 Please ensure the discharge time interval of capacitor.

 Disconnect the device if it does not work during commissioning.

 Do not install the device if it is in damaged condition.

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Contents

Features 04

Specifications

Connector Details 06

Installation Scheme 07

Control Wiring diagram 10

Communication Port Diagram 11

Display 12

Method For Keyboard/ Display Editing 16

EDIT PARAMTERS
Edit Parameters General and IO 17
Edit Parameters System 19
Edit Parameters Fault 21
Edit Parameters Step 27
Edit Parameters Communication 31
Edit Utilization Counter 32

Auto Operation 33

Manual Operation 34

Commissioning instructions before panel is powered up 35

Commissioning Instructions after panel is powered up 37

Fault Finding Guidelines

Installation Scheme 07
Fault Finding Guidelines 38

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FEATURES:

 Totally microprocessor controlled Digital Signal Processing logic for measurements.

 Suitable for Contactor Switched Automatic Power Factor Correction panel.
 All measurements with 1.0 class accuracy.
 Load voltage, load current and capacitor current THD measurement with odd
harmonic coefficient upto15th harmonic. Neutral current analysis too.
 Various modes for switching are as follows:
1) Binary
2) Un-equal (user defined)
3) LIFO
4) FIFO
 Output of relay contacts available up to 12
 One Auxiliary Input and Auxiliary Output with user defined functionality.
 Capable of doing the KVAR measurements every cycle of the mains waveform.
 Standard 144 X 144 mm panel flush mounting arrangement. Max depth 150 mm.

Recommended cutout for panel front door is 138x138 mm.

 Serial communication through standard protocols. In case of requirements with MODBUS
connectivity, this can be provided on optional basis.
 One RS-232 communication port with protocol is provided on front fascia.

 Protections provided (user settable):

Over / Under Voltage
Capacitor Over-current/ THD
Over / Under load
Load Unbalance
Over Temperature
Out Of Steps (only for indication)

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SPECIFICATIONS:

 Feed-back Voltage: 3 phase, 3 wires, 11kVolt (+20% / -40%).

 Current input: Selectable 1A/5A for load and capacitor feed-back.

 Measurement Accuracy: 1.0% (Dynamic range 10).

 Auxiliary Supply: 110V / 230V / 415 Volt (L-L) (+20% to -40%).

 Output commands: Maximum 12 outputs (Isolated ‘NO’ contacts of rating 5Amp,

250 Vac).

 RS-232 baud rate selectable upto 57.6 KBPS.

 1.0 class measurement Operating temperature: 0 to 55ºC.

 Storage temperature: -10 to +75ºC.

 Humidity: 0 to 98%.

 Supply frequency: 45Hz to 55Hz.

 Output commands models for 12 outputs.

 Display of instantaneous waveform of KW, KVAR, KVA, VOLTAGE, CURRENT of each

phase, through communication port RS-232.

Terminal and Connector arrangement is at the Back and Bottom side of the instrument. Terminals provided are plug in
type connectors. While installation/dismantling the unit, the terminals should be removed by plugging them out.

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CONNECTOR DETAILS:

Connector 1: Measurement Voltage connector

R-Ph Y-Ph B-Ph Fuse
0.5 A

Connector 2: Supply voltage feedback connector

L1 L2 Fuse
0.5 A

Connector 3:Load Current feedback connector

RS1 RS5 RS YS1 YS5 YS BS1 BS5 BS

Connector 4:Capacitor Current feedback connector

RS1 RS5 RS YS1 YS5 YS BS1 BS5 BS

Connector 5:Output commands connector(Bank ON Signal)

b
com B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12

COM: Common of Output

C1 – C12: Command Output No.1 to 12 for controller GB-VI-3L-12

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INSTALLATION SCHEMES:

Scheme-1: C.T. & P.T. Sense from LT side.

HT SIDE
SCEME 1

T/F

LT SIDE

LOAD
CT

LOAD

CAP APFC
CT

This scheme is considered for the LT consumers of electricity where the metering is carried out on LT side.
This is more beneficial when the user is interested in maintaining the Power Factor on the secondary side of
the transformer.

As per this scheme the Voltage feedback is taken from the LT bus & C.T. sense is taken from output of
Transformer in such a way that the C.T. senses the Load as well as Capacitor Current.

Capacitor current feedback is taken from all the capacitor banks that are controlled by i.e. the
GB-VI-3L-12 capacitor feedback C.T. senses the overall current of the capacitor banks in the circuit.

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Scheme-2: C.T. & P.T. Sense from HT side.

HT SIDE SCEME 2

LOAD
CT

PT
T/F

LT SIDE

LOAD

CAP APFC
CT

This scheme is considered for LT consumers of electricity, where the metering is carried out on HT side.

In this scheme, the compensation is also against magnetizing current of the transformer (i.e. No Load
Compensation of Transformer). Hence the consumer will get the results with more accuracy.

In this scheme, the load sensing of C.T. and the voltage feedback of P.T. is taken from the primary side of
the transformer (i.e. HT Side).

Capacitor current feedback is taken from all the capacitor banks that are controlled by i.e. the
GB-VI-3L-12 capacitor feedback C.T. senses the overall current of the capacitor banks in the circuit.

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Scheme-3: Usage with Mains/Generator changeover system & P.T. Sense from LT side

Figure.1 Figure.2

HT SIDE SCEME 3 HT SIDE SCEME 3

GENERATOR T/F GENERATOR T/F

LT SIDE LT SIDE

LOAD CT

SUMMATION
CT

LOAD LOAD

APFC APFC
CAP CAP
CT CT

In case of system with dual sources of supply, i.e. Supply grid and Generator. Under such case, the system
can be shifted between the two sources. For every source there may be different requirements of maximum
loading on sources as well as requirements of different P.F. target settings.

In this scheme, a summation C.T. is used as shown in Figure.1 or C.T. must be used at common bus of
Mains and Generator supply as shown in Figure.2. The changeover between the two sources is indicated to
through its GB-VI-3L-12 Auxiliary Input port.

Using this scheme, user has an advantage of using single P.F. improvement system with either of source in
operation.

Capacitor current feedback is taken from all the capacitor banks that are controlled by i.e. the
GB-VI-3L-12 capacitor feedback C.T. senses the overall current of the capacitor banks in the circuit.

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CONTROL WIRING DIAGRAM:

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 COMMUNICATION PORT DIAGRAM:

RS-232 serial communication 9 pin D connector:

5 4 3 2 1

6 7 8 9

GND TXD RXD

RS-232 cable connection Details:

PIN PC side CONNECTION GB-VI-3L-

NO Connection 16

1 NC
2 RXD TXD
3 TXD RXD
4
5 GND GND
6
7
8
9 NC

Communication Terminals: GB-VI-3L-08 has one serial communication port that is on front D type
connector. The default is RS-232.

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 RS-485 serial communication 9 pin D-Connector:

5 4 3 2 1

6 7 8 9

+ 485 - 485 GND

RS-485 cable connection Details:

PIN PC side CONNECTION GB-VI-3L-

NO Connection 16

1 GND VCC
2 NC -
3 NC +
4 - 485 GND
5 + 485
6
7
8
9 NC

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DISPLAY:
The first line of LCD Display (Default) condition shows ‘’ PF = ‘’ i.e. Power factor sensed from the load
sensing CT i.e. the Transformer / Supply grid. Further, screen also shows “IND” for Inductive Power Factor
& “CAP” for Capacitive Power Factor. Controller works with two set points. One group of set points is for
Transformer/Supply grid and other group of set points is for generator operation. Transformer/Supply grid
operation is indicated by “↑” and generator operation is indicated by “↓”.Then it shows the operation mode
i.e. “A “ for auto mode and “M” for Manual mode. Last digit of first line shows “OK” (blinking) indicates status
of the system, healthy or faulty.
The bottom line of the LCD display shows capacitor bank status which is also shown by LEDs for each step

= This symbol indicates that bank is connected and it is in ON state.

= This symbol indicates that bank is declared as fixed bank and is ON.

C = This symbol indicates that bank is declared as faulty and is OFF.

= This symbol indicates that output is in discharging mode (blinking red LED).

There are number of options on screen that shows various parameters that are measured or derived. These
various options can be used to display parameters by pressing the Scroll UP and DOWN keys.

DISPLAYING OF OTHER PARAMETERS:

To observing other system related parameters Scroll up/down keys and then pressing ENT key. To exit from
a sub-menu press MODE. Following is the sequence of the parameters displayed on LCD screen.

1. Display Overall Values: Overall values give overall system parameters are as follows:

1) Average Voltage 5) Apparent power 9) Load Side KVAR

10960.8V (L-L) 002830.3 KVA 003875.0
2) Average Current 6) Cap-Current 10) Load Side KVA
0148.5 Amp 0074.6 A 0004110.0
3) Active Power 7) C-KVAR 11) Frequency
001389.2 KW S001412.9 50.0 Hz
4) Reactive Power 8) Load Side PF
002461.3 KVAr 0.33 IND

2. Display Per-Phase RMS: Per Phase RMS values for the instantaneous parameters like:

1) R-Y Voltage 4) R-Phase Current 7) R-Phase Cap Cur

10940.0 V(L-L) 149.8A 0074.6
2) Y-B Voltage 5) Y-Phase Current 8) Y- Phase Cap Cur
10940.0 V(L-L) 148.9A 0074.6
3) B-R Voltage 6) B-Phase Current 11) Y-Phase Cap Cur
10940.0 V(L-L) 150.1 A 0074.2 A

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3. Display Power: It gives per phase values of parameters like:

1) R-Phase PF 8) Y-Phase KVAR

0.48 IND 000870.7
2) Y-Phase PF 9) B-Phase KVAR
0.48 IND 000870.2
3) B-Phase PF 10) R-Phase KVA
0.48 IND 000977.8
4) R-Phase KW 11) Y-Phase KVA
000459.0 000990.0
5) Y-Phase KW 12) B-Phase KVA
000469.0 0001005.3
6) B-Phase KW 13) R-Phase CKVAR
000475.0 000496.3
7) R-Phase KVAR 14) Y-Phase CKVAR
000868.7 000500.3

4. Display Energy: It gives overall energy parameters like:

1) KWH
00000000.0
2) KVAH
00000000.0
3) CAP-KVARH
00000000.0
4) IND KVARH
00000000.0
5) CKVARH
00000000.

5. Display Harmonics: This gives per phase Voltage, Current, Neutral current & Capacitor per phase
current THD as well as odd harmonics coefficients up-to 15th.

1) Vr-THD-F 6) Ib-THD-F
000.0% 000.0%
2) Vy-THD-F 7) CCr-THD-F
000.0% 000.0%
3) Vb-THD-F 8) CCy-THD-F
000.0% 000.0%
4) Ir-THD-F 9) CCb-THD-F
000.0% 000.0%
5) Iy-THD-F
000.0%

6. Display Step KVAR: It gives the values of KVAR that is measured for every output step.

1) Step[01] KVAr
0300
2) Step[02] KVAr
0600
UPTO
12) Step[12] KVAr
0600

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 7. Display Aux-Function: It displays auxiliary functions like internal and external temperature.

1) Unit Serial No.

5535
2) Temperature
35 Deg C
3) Time : 17:05:1
Date : 10/10/15

8. Time: 02:02:08: It displays Date and Time that is set on internal RTC.
Date: 10/10/18

9. GB CONTROLS : It displays the version of software.

Ver – 1.0.1

Harmonic data of various current & voltage parameters can be viewed by pressing ENT on the respective
parameter screen of the Harmonics menu. Following are the sub-menus giving the harmonic data of voltage, current
& capacitor current for each phase.

V-Harmonics:
1) Vr harmonics 7) Vr harmonics 13) Vy harmonics 19) Vb harmonics
03rd: 00.0% 15th: 00.0% 13th: 00.0% 11th: 00.0%
2) Vr harmonics 8) Vy harmonics 14) Vy harmonics 20) Vb harmonics
05th: 00.0% 03rd: 00.0% 15th: 00.0% 13th: 00.0%
3) Vr harmonics 9) Vy harmonics 15) Vb harmonics 21) Vb harmonics
07th: 00.0% 05th: 00.0% 03rd: 00.0% 15th: 00.0%
4) Vr harmonics 10) Vy harmonics 16) Vb harmonics
09th: 00.0% 07th: 00.0% 05th: 00.0%
5) Vr harmonics 11) Vy harmonics 17) Vb harmonics
11th: 00.0% 09th: 00.0% 07th: 00.0%
6) Vr harmonics 12) Vy harmonics 18) Vb harmonics
13th: 00.0% 11th: 00.0% 09th: 00.0%

I-Harmonics:
1) Ir harmonics 8) Iy harmonics 15) Ib harmonics
03rd: 00.0% 03rd: 00.0% 03rd: 00.0%
2) Ir harmonics 9) Iy harmonics 16) Ib harmonics
05th: 00.0% 05th: 00.0% 05th: 00.0%
3) Ir harmonics 10) Iy harmonics 17) Ib harmonics
07th: 00.0% 07th: 00.0% 07th: 00.0%
4) Ir harmonics 11) Iy harmonics 18) Ib harmonics
09th: 00.0% 09th: 00.0% 09th: 00.0%
5) Ir harmonics 12) Iy harmonics 19) Ib harmonics
11th: 00.0% 11th: 00.0% 11th: 00.0%
6) Ir harmonics 13) Iy harmonics 20) Ib harmonics
13th: 00.0% 13th: 00.0% 13th: 00.0%
7) Ir harmonics 14) Iy harmonics 21) Ib harmonics
15th: 00.0% 15th: 00.0% 15th: 00.0%

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CC-Harmonics:

1) CCr harmonics 8) CCy harmonics 15) CCb harmonics

03rd: 00.0% 03rd: 00.0% 03rd: 00.0%
2) CCr harmonics 9) CCy harmonics 16) CCb harmonics
05th: 00.0% 05th: 00.0% 05th: 00.0%
3) CCr harmonics 10) CCy harmonics 17) CCb harmonics
07th: 00.0% 07th: 00.0% 07th: 00.0%
4) CCr harmonics 11) CCy harmonics 18) CCb harmonics
09th: 00.0% 09th: 00.0% 09th: 00.0%
5) CCr harmonics 12) CCy harmonics 19) CCb harmonics
11th: 00.0% 11th: 00.0% 11th: 00.0%
6) CCr harmonics 13) CCy harmonics 20) CCb harmonics
13th: 00.0% 13th: 00.0% 13th: 00.0%
7) CCr harmonics 14) CCy harmonics 21) CCb harmonics
15th: 00.0% 15th: 00.0% 15th: 00.0%

METHOD FOR KEYBOARD/DISPLAY EDITING:

GB-VI-3L-12 relay keyboard has 7 keys.
ENT- key is at center,
UP, DOWN - for scrolling the display windows located at up and down position from ENT key respectively,
MODE and SAVE - keys are placed at left and right side of DOWN key respectively.
RIGHT and LEFT - keys for shifting cursor right and left located right and left side of ENT key respectively.
MODE - key is used to have access in different mode of relay operations and
SAVE - key is used for storing edited data in memory. For editing any parameter in the relay, press mode
switch the Password window will be displayed, if password is enabled (By default it is disabled). Enter
password by using arrow keys then press ENT.

Using UP & DOWN key, select one of the following mode.

 EDIT PARAMETERS

 AUTO OPERATION

 MANUAL OPERATION

Then press ENT switch to enter the specific mode.

(During commissioning edit the required parameters by setting in the EDIT PARAMETER mode, then follow
the AUTO or MANUAL mode selection).

EDIT PARAMETERS:

Select
1.EDIT
PARAMETERS

The Editing of various system parameter settings can be carried out by using UP and DOWN keys & also by
selecting various options, which can be edited as per the requirement. For saving/Setting the editing
parameters choose one of the options and press ENT to sub menus of the specific types. The details of sub
menus are given below. Coming out of menu/sub-menu press MODE key once.
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To store edited parameters permanently, press SAVE when either in EDIT Parameter type or submenu areas.
To come out of EDIT Parameters without saving the changes, press MODE key again.
(Note: During Editing if the key is not pressed within a minute time span (60 sec) then default screen will
appear and the changes done will get discarded.)

Following is the sequence for editing Parameters:

EDIT PARAMETERS GENERAL AND IO:

1. Password: “Password” to enter into any mode can be enabled by setting the parameter as “Enable”. The
default value is “Disable”. The status Enable/Disable can be made by changing digits 0/1 by
UP/DOWN keys when the cursor is blinking.

Password
Disable: 0

Password
Enable: 1

2. Change Password: The 3 digit number that can act like a password can be changed by changing the value
in this parameter.

Change Password :111

2. Load Default: There are number of parameters that are already set during the manufacturing
process. The settings can be changed as the customer’s requirement and for retrieval
the factory settings the load default can be set to “Yes” and then by pressing the
“SAVE” command.

Load Default
No: 0

Load Default
Yes: 1

4. THD To Display: It can be helpful for selecting the type of THD to be displayed for Voltage, Current
and Capacitor Current. R-THD means RMS values & F-THD means Fundamental values.

THD TO DISPLAY
R-THD: 0

THD TO DISPLAY
F-THD: 1

5. Reset Energy: It resets the Energy , No = 0 & Yes = 1.

RESET ENERGY
No: 0
RESET ENERGY
Yes: 1

6. Reset Data? : It resets the Data , NO = 0 & Yes = 1.

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 RESET DATA?
No : 0
RESET DATA?
Yes : 1

EDIT PARAMETERS SYSTEM:

1. Measurement Voltage: 110 V

110 Volts is the measurement voltage of GB-VI-3L-12 Relay (Non-editable)
Meas. Voltage : 110V

2. External P.T. Ratio: For rated system voltages other than 110 Volts, a external P.T. can be used. The P.T.
ratio of secondary to primary has to be edited. Without external P.T. the ratio is 0001.0:1, e.g. With 11kV
system with 110V secondary P.T., this ratio is “100.00”.

EXT-PT Ratio
0100.0:1

3. Current C.T. Primary Mains: GB-VI-3L-12 Relay displays the primary current rating of the connected load
side C.T.

CUR CT Primary
Mains: 800

4. Current C.T. Secondary :

Sec 1: 0
Sec 5: 1

5. Capacitor Current C.T. Primary Mains: This parameter will define the capacitor current feedback
. C.T primary ratings in terms of Amperes.

CAP CUR CT Prim: 0500

6. Capacitor Current C.T. Sec :

Sec 1: 0
Sec 5: 1

7. P.F. Upper Limit: Mains : Upper target P.F. setting. The limit setting can be selected as
Inductive by setting ‘1’ or Capacitive by setting ‘0’.

PF Up Lim : Mains
[Cap :0] : 0. 999

PF Up Lim : Mains
Cap 0 : [0. 999]

8. P.F. Lower Limit: Mains : Lower target P.F. setting. The limit setting can be selected as
Inductive by setting ‘1’ or Capacitive by setting ‘0’.

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 PF Up Lim : Mains
[Cap :0] : 0. 999

PF Up Lim : Mains
Cap 0 : [0. 999]

9. P.F. Upper Limit : GEN : Upper target P.F. setting. The limit setting can be selected as
Inductive by setting ‘1’ or Capacitive by setting ‘0’.

PF Up Lim :GEN
[Cap :0] : 0. 820

PF Up Lim : GEN
Cap 0 : [0. 820]

10. P.F. Lower Limit: GEN : Lower target P.F. setting. The limit setting can be selected as Inductive
by setting ‘1’ or Capacitive by setting ‘0’.

PF Up Lim :GEN
[Cap :0] : 0. 820

PF Up Lim : GEN
Cap 0 : [0. 820]

11.Mains/Generator : This parameter will informs controller whether default operation is

Mains or Generator.

Mains Generator
Mains: 0

Mains Generator
Generator: 1

12. Phase Auto Sync :

NO : 0
YES : 1

13. Auto Sync Fault Tol (%) :

Auto Sync Fault
Tol (%) : 20

14. Reset Auto Sync :

NO : 0
YES : 1

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EDIT PARAMETERS FAULT:

1. Over Voltage Fault: During Over Voltage conditions, the action taken by is indicated GB-VI-3L-12 as
follows. The options displayed on the screen are
Over Vol Fault
Disable: 0
Over Vol Fault
Indicate: 1
Over Vol Fault
Off Step: 2
Over Vol Fault
Off Fix: 3

Over Vol Fault

Fast Off: 4

0: Disable: Display screen will not indicate the fault nor action will be taken by
the relay.
1: Indicate: Only the Fault will be displayed by the Relay.
2: Off Step: In this option, Variable Banks will be switched OFF step by step with
1sec step delay by the relay.
3: Off Fix: The fixed banks will be switched OFF along with Variable Banks, if the
fixed banks are controlled by GB-VI-3L-12
4: Fast Off: Variable and Fixed banks are turned Off simultaneously.

2. Over Voltage Limit (%): The parameter defines the level of over voltage at which fault would be detected.
Over Voltage Limit (%): 115

3. Over Voltage Resume (%): The parameter defines the level of over voltage at which fault would be reset
and GB-VI-3L-08 operation will resume.

Over Voltage Resume (%): 110

4. Under Voltage Fault: During Under Voltage conditions, the action taken by GB-VI-3L-12 is indicated as
follows. The options displayed on the screen are

Under Vol Fault

Disable: 0

Under Vol Fault

Indicate :1
Under Vol Fault
Off Step :2
Under Vol Fault
Off Fix: 3
Under Vol Fault
Fast Off: 4

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 0: Disable: Display screen will not indicate the fault nor action will be taken by
the relay.
1: Indicate: Only the Fault will be displayed by the Relay.
2: Off Step: In this option, Variable Banks will be switched OFF step by step with
1sec step delay by the relay.
3: Off Fix: The fixed banks will be switched OFF along with Variable Banks, if the
fixed banks are controlled by GB-VI-3L-12.
4: Fast Off: Variable and Fixed banks are turned Off simultaneously.

5. Under Voltage Limit (%): The parameter defines the level of under voltage at which fault would be
detected.
Under Voltage Limit (%): 115

6. Under Voltage Resume (%) : The parameter defines the level of under voltage at which fault would be reset
and operation GB-VI-3L-12 will resume

Under Voltage Resume (%): 110

7. Over Load Fault: During Over load conditions, the action taken by is indicated GB-VI-3L-12 as
follows. The options displayed on the screen are
Over Load Fault
Disable: 0
Over Load Fault
Indicate :1
Over Load Fault
Off Step :2
Over Load Fault
Off Fix :3
Over Load Fault
Fast Off: 4

0: Disable: Display screen will not indicate the fault nor action will be taken by
the relay.
1: Indicate: Only the Fault will be displayed by the Relay.
2: Off Step: In this option, Variable Banks will be switched OFF step by step with 1sec
step delay by the relay.
3: Off Fix: The fixed banks will be switched OFF along with Variable Banks,
if the fixed banks are controlled by GB-VI-3L-12.
4: Fast Off: Variable and Fixed banks are turned Off simultaneously.

8. Over Load Cur Limit (%): The parameter defines the level of Over load at which fault would be
detected.
Over Load Limit (%): 115

9. Over Load Resume (%): The parameter defines the level of Over Load at which fault would be reset and
GB-VI-3L-12 operation will resume.

Over Load Resume (%): 110

10. Under Load Fault: During Under load conditions, the action taken by is indicated GB-VI-3L-12 as follows.
The options displayed on the screen are

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 Under Load Fault
Disable: 0

Under Load Fault

Indicate :1

Under Load Fault

Off Step :2

Under Load Fault

Off Fix: 3

Under Load Fault

Fast Off: 4

0: Disable: Display screen will not indicate the fault nor action will be taken by
the relay.
1: Indicate: Only the Fault will be displayed by the Relay.
2: Off Step: In this option, Variable Banks will be switched OFF step by step with
1 sec step delay by the relay.
3: Off Fix: The fixed banks will be switched OFF along with Variable Banks, if the
fixed banks are controlled by GB-VI-3L-12
4: Fast Off: Variable and Fixed banks are turned Off simultaneously.

11. Under Load Cur Limit (%): The parameter defines the level of Under load at which fault would be
detected.
Under Load Limit (%): 115

12. Under Load CUR Resume (%): The parameter defines the level of Under Load at which fault would be
reset and GB-VI-3L-12 operations will resume.

Under Load Resume (%): 110

13. Load Unbalance Fault: The limits defined here are in % of maximum of the three phase source
current compared with the minimum of three phase source current.

Load Unbalance Fault

Disable: 0

Load Unbalance Fault

Enable: 1

Load Unbalance Fault

OFF STEP : 2

Load Unbalance Fault

OFF Fix : 3

Load Unbalance Fault

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 Fast OFF : 4

14. Load Unbalance limit (%):

Load Unbalance
Limit (%) : 040

15. Load Unbalance Resume(%):

Load Unbalance
Resume (%) : 040

16. Over Capacitor Current Fault: This fault is capacitor Over current for the given KVAR connected.

Over CAP-I Fault

Disable: 0

Over CAP-I Fault

Enable: 1

Over CAP Current

Limit: 130%

Over CAP Current

Resume: 125%

OverCC Auto Rstrt

Disable: 0

OverCC Auto Rstrt

Enable: 1

Auto Restart Time

Seconds: 0060

17. Over Capacitor Current Limit (%): The parameter defines the level of Over Capacitor Current at
which fault would be detected.

Over Capacitor Current

Limit (%) : 130

18. Over Capacitor Current Resume (%):The parameter defines the level of Over Capacitor Current at
which fault would be reset and GB-VI-3L-08 operation will resume.

Over Capacitor Current

Resume (%) : 110

19.OverCC Auto Restart Time Seconds:

Disable: 0
Enable: 1

20.Auto Restart Time Seconds :

Auto Restart Time
Seconds : 060

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21. Temperature Fault: GB-VI-3L-12 is capable of sensing the temperature inside its own cabinet. In case of
excessive limit of the temperature, the unit can be used to disable all the
output commands to the capacitor banks. Upper limit is for tripping and lower
limit is for normal operation.

Temperature Flt
Disable: 0

Temperature Flt
Indicate :1

Temperature Flt
Off Step :2

Temperature Flt
Off Fix: 3

Temperature Flt
Fast Off: 4

0: Disable: Display screen will not indicate the fault nor action will be taken by
the relay.
1: Indicate: Only the Fault will be displayed by the Relay.
2: Off Step: In this option, Variable Banks will be switched OFF step by step
with 1sec step delay by the relay.
3: Off Fix: The fixed banks will be switched OFF along with Variable Banks, if
the fixed banks are controlled by GB-VI-3L-12
4: Fast Off: Variable and Fixed banks are turned Off simultaneously.

Temperature Deg C
L .Limit: 50

Temperature Deg C
U.Limit: 60

22. Temperature L.Limit:

Temperature
L .Limit : 010 To 60 Deg C

23. Temperature U.Limit:

Temperature
U .Limit : 060 To 100 Deg C

24. Capacitor Current THD Fault: The controller can sense the THD value of the capacitor current
and in case of THD exceeding can give this fault.

CapCur THD Flt

Disable: 0

CapCur THD Flt

Enable: 1

Cap Cur THD

Limit: 010%
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 Cap Cur THD
Resume: 008%

25. Capacitor Current THD Limit (%):

Capacitor Current THD

Limit (%):

26. Capacitor Current THD Resume (%):

Capacitor Current THD

Resume (%) : 020

27. Step Health Check: GB-VI-3L-12 carries out on line monitoring of the KVAr values of every step when the
step is put in the circuit. In case the tolerance limit defined here is exceeded, that
specific bank is declared faulty.

Step Health Chk

Disable: 0

Step Health Chk

Enable: 1

Cap Cur Fault

Tolerance: 10%

28. Cap Cur Fault Tolerance :

Cap Cur Fault
Tolerance : 070

29. Out Of Banks Fault: In case GB-VI-3L-12 after switching on all the possible capacitor banks finds,
that for next two consecutive correction cycles, P.F. is lower than the P.F. lower limit, then this fault is indicated if
enable option is selected. But this fault does not switch off capacitor banks

Out Of Banks Flt

Disable: 0

Out Of Banks Flt

Enable: 1

EDIT PARAMETERS STEP:-

1. Steps Connected: The parameter indicates the total number of Steps (either declared as fixed or variable)
that can be switched ON/OFF by GB-VI-3L-12.

Steps Connected: 12

2. Default Mode: US-HT-5004can be used in Auto or Manual mode of operation. Usually it is Auto mode but
in case, it is operated in manual mode as normal default, the setting ‘1’ here will do the same. In case of
power failure and again power is resumed the operation mode will be selected before the failure.

Default Mode Auto : 0

Default Mode Manual

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3. Compensation . Method
Fine : 1
Fair : 2
Max : 3
R - ph : 4
Y - ph : 5
B - ph : 6
Mean : 7

4. Compensation KVAR: In auto mode, the KVAR to be inserted in the system can be calculated by
two methods.

0 :( Instant.): On instantaneous value at the moment of compensation.

1 :( Mean): On basis of the mean KVAR over a period of one compensation cycle.

Compensation KVAR
Instant: 0

Compensation KVAR
Mean: 1
5. Capacitor Bank Voltage: Line to line value of Capacitor bank voltage is defined here. i.e. it defines the
Voltage value at the defined KVAR.

Cap Bank Voltage

(L-L): 00415V

6. Correction Time: Correction time is the time during which there is total inactivity (except
measurement) as far as capacitor switching is concerned
i.e. it is the time period between the two successive KVAR compensations.

Correction Time
Seconds: 010

7. Discharge Time: Time defined here is the time for discharge of the capacitors to a level, so that they
can be turned ON again. Discharge time should be always kept at 1 minute.

Discharge Time
Seconds: 060

8. Step Response: Step Response defines the time after which the KVAR of any step should be measured
when the step turns on.

Step Response
Cycles: 00045

9. Fix-Bank Setting: By using the keys “ENT”, “UP” and “DOWN”, the fixed banks can be defined for
specific output of GB-VI-3L-12. Fixed banks are the banks that are kept ON at minimum loading or for
no-load compensation of transformer.

10. Operating Mode :

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 UNEQUAL : 0
FIFO : 1
LIFO : 2
BINARY : 3

1) UNEQUAL : If the capacitor banks does not having a definite ratio. Un-Equal banks
option to be selected.

Correction Type
Un-Equal : 1

If Unequal KVAR bank configuration is used, these parameters are to

be defined for every bank KVAR.
GB-VI-3L-12. has an in built intelligent algorithm to select the best possible
combination to match the exact KVAR requirement for compensation.
Unequal Bank [1] KVAr : 010
Unequal Bank [2] KVAr : 025
 
 
 
 
Unequal Bank [8] KVAr : 075

2) Binary : In this configuration, banks can be configured in ratio of 1, 2, 4, 8, 16

Correction Type
Binary : 0

11. Ext-Fixed Bank KVAR: In case APFC system uses some capacitor bank as fixed step and not
controlled by GB-VI-3L-12, then it should be specified here
Ext Fix Bank
KVAr: 010

EDIT PARAMETERS COMMUNICATION:

1) UNIT ID: Value of Unit ID can be 0000 to 9999. This ID is used for serial communication on RS-232
protocol.
UNIT ID: 0000

2) Baud Rate: Selectable: 0 = 9600bps; 1 = 19200bps; 2 = 38400bps; 3 = 57600bps; 4 = 115200bps;

BAUD RATE – COM1

9600:0

3) TIME: It defines Time settings for Controller.

TIME
14: 47:57

4) DATE: It defines Date settings for Controller.

Date
19:08:10

5) Initialization of RTC: It initializes the real time clock by defining ‘Yes’. Press SAVE button after
setting this parameter
Initialize RTC
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 No: 0
Initialize RTC
Yes:1

6) COM2 Function:

Disable : 0
ASCII : 1
RTU : 2

7) Data Log Interval: It defines the data logging period of controller.

Data Log Interval

Minute : 60

EDIT UTILIZATION COUNTER:

1. Utilization Bank Counter: The value on the screen indicates the total switching of a single step capacitor
bank. These counters are used for equal utilization for the Banks of same
KVAR value. This improves the life of switch and capacitor.
For the Banks with the same KVAR value, this value is used for FIFO
operation. The counter values are for indication purpose only and are not
editable.
Utilization Cntr
Bank [1] : 000006
Utilization Cntr

Bank [2] : 000005

.
.
Utilization Cntr
Bank [8] :000008

2. Clear Bank Counter: In case of APFC system, if a capacitor bank or the associated equipment’s
(Contactors etc) are replaced, then the corresponding step utilization counter value can be set to zero so that the
replaced bank can be operational in the system. If GB-VI-3L-12 is replaced with some other new system, these
counters can all be reset to zero by setting Yes option here.
Clr Bank [1] Cntr
No : 0
Clr Bank [1] Cntr
Yes : 1
.
.
Clr Bank [8] Cntr
No : 0
Clr Bank [8] Cntr

Yes: 1

AUTO AND MANUAL OPERATION MODES:

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 Control operates in two modes of operation “Auto” and “Manual”.

AUTO OPERATION:

Select
2.Auto Operation

Press “ENT” button on the screen that will operate the GB-VI-3L-12 in Auto mode. The set mode will continue
till alternate operation mode is selected or unit is put to Power down condition.

In auto mode operations, the GB-VI-3L-12 will switch the capacitor bank ON/OFF as per the load requirement.

Here GB-VI-3L-12 calculates the KVAR compensation value and selects the closest equivalent capacitor
combination and the same are activated in the system so that the P.F. is maintained at the desired level.
Relay calculates internally C/K ratio for correct compensation. On the default display, the status of capacitor
bank is seen as activated by GB-VI-3L-12.

While performing the compensation, GB-VI-3L-12 can even calculate the KVAR of every step that operates in
the system. This enables on line Health-monitoring of every capacitor bank operating in the circuit. assumes
that during the switching of contactor, spikes currents are generated. Hence to avoid a major spike current,
the banks are switched ON after a safe time delay. Switching time is inbuilt in the relay.

MANUAL OPERATION:

Select
3.Manual Operation
Press “ENT” button on the screen that will operate the GB-VI-3L-12 in Manual mode. The set mode will
continue unless it is purposely changed or Power is down.

This mode is normally used to perform the following operations:

• Indication of Faulty Bank on the screen can be reset.
• Checking the Capacitor banks by switching them ON/OFF.
• Declaring specific banks faulty/ Masking of the banks so that once auto mode is selected, these faulty
declared banks cannot be used.

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For Testing banks with manual ON / OFF commands:

Press “ENT”, the cursor will start blinking. Use LEFT & RIGHT keys to select the specific bank. Use UP key to
turn On and DOWN key to turn Off the capacitor banks. After pressing UP key, symbol will appear with cursor
blinking status and when DOWN key is pressed symbol will disappear. To come out of Manual On/Off edit
mode, press “ENT” key so that cursor stops blinking.

COMMISSIONING INSTRUCTIONS BEFORE PANEL IS POWERED ON:

For Contactor Switch operated scheme:

1. Panel Wiring Check:

Ensure that there are no loose connections and the wiring is as per the wiring diagram.

2. Power Wiring Check:

Ensure that the power cables are connected properly from source to the Panel incomer and then to
the feeder incomer. Refer the schemes given in earlier part of this manual for C.T. and P.T.
connection.

Ensure that the Bus Bars and/or Lugs are Clean, Dust free, No Corrosion or Oxidation on the
contact sides so that it does not disrupt electrical connection. Use proper lugs/connectors to get
maximum contact area.

3. Load Feed Back C.T. connection.

Ensure that the load feedback C.T. connections are proper and the C.T. is connected in proper
phase as per the wiring diagram and check polarity. Also ensure that there is provision for
shorting the C.T.

C.T. connections to be done carefully so as to ensure that the wires do not remain open and no
loose connection.

Loose connections or open C.T. secondary can result to very high voltages developed in the
circuit that can damage the C.T. and also risk of noise in the system. GB-VI-3L-08 relay is
provided with three terminals for each phase of C.T. secondary so that 1 Ampere and 5 Ampere
can be selectable. For 1A secondary C.T. connections, connect C.T. of R-Phase, Y-Phase and
B-Phase to RS - RS1, YS -YS1 and BS - BS1 terminals of controller respectively. For 5A
secondary C.T. connections, connect C.T. of R-Phase, Y-Phase and B-Phase to RS - RS5, YS
- YS5 and BS - BS5 terminals of controller respectively

4. Neutral & Earth connections.

Ensure that the neutral and earth connections are proper. The Panel should not be powered before
confirmation.

Follow the below instructions:

• Remove the power connection to the Controller.

• Remove all control fuses in the panel.
• Switch off all MCB’s /remove fuses for capacitors in the panel.
• Switch on the incoming MCCB/SFU/ACB in the panel.
• Measure the three-phase voltages w.r.t. Neutral.
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 • Measure the voltage at the Earth terminal w.r.t. Neutral. This voltage should not exceed
5V ac.
• In case any of the above measured voltages are out of the specified range, switch OFF the
MCCB, rectify the wiring and then repeat the procedure.

The controller and the control sections should not be powered before the Neutral and Earth connections
are proper, to avoid permanent damage to the controller, contactor coils, fans and other equipment’s in the
panel. The Power connections are done, to source side, in such a way that, the wires are not accidentally
disconnected. If required, use proper labels on the wires to identify them.

COMMISSIONING INSTRUCTIONS AFTER PANEL IS POWERED UP:

1. Remove the fuses or switch off MCBs / MCCBs in series with every capacitor bank. Connect the
supply to the controller. Keep the load current (C.T.) feedback in short condition.

2. Turn On the supply to the panel and set Date/time and various other parameters as per the panel
configuration. It is important to understand the meaning of every parameter from the instructions
given before and then put the appropriate values in them. Wrong values entered can give the
wrong performance of the panel.

3. Once the setting of parameters is complete, put the GB-VI-3L-12 in Manual mode to check every
bank command is transmitted to the switch. This can be observed by switching the contactors ON &
OFF.

4. Once all the contactors get the correct commands, switch OFF the supply and place all the fuses
(or turn on MCB’s/MCCB’s if they are provided instead of fuses).Turn on the panel.

5. Put GB-VI-3L-12 back in Manual mode and turn ON/Off the individual steps. Use Current Clamp (AC
current measurement) to check the current in all the three phase of the corresponding banks.

6. Keep all the banks in off mode. Remove the short-link of Load feedback C.T. In case KW value is
seen as negative, reverse the C.T. polarity.

7. Switch OFF all the banks manually and put the GB-VI-3L-12 in Automatic mode. Observe the panel
performance for a period of about 2hrs after the commissioning.

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FAULT FINDING GUIDELINES:

Fault Type Probable Reason Action to Take

Unit Does not turn  Input
supply not coming.  Check the input supply to
ON. LCD is blank  Input
side fuses blown or restore.
with no Backlit. MCB’s gets damaged.  Check fuses/MCB’s in the
unit for OK.
Unit not turning ON  This is perfectly OK if unit is  As this is normal action,
any capacitor banks, powered up, there is a need not take any action.
immediately after delay of correction time that Unit will start performing
Power on. is provided in the unit only normally after the
after which units can turn stipulated time delay.
on outputs.
With whatever  Check connection as per  Correct the wiring as
capacitor banks ON, control wiring diagram. per the scheme
SPF3-08M does not Check that Load C.T. requirements and the
indicate the P.F. as connected is in correct C.T. positioning.
improved. phase.
Relay shows  Phase Sequence of C.T.  Check the KW in the
Capacitive P.F. Relay if it is negative
while there is No Interchange the C.T.
Capacitive Load. polarity.
Main Energy Meter  C.T. position & rating.  Check the C.T. position
P.F. reading &  Excessive Distance & correct it as per given
Relay P.F. reading between Relay & Energy in Scheme 1/2/3.
are not matched. Meter.  C.T. wiring should be
up to 10mtr.
Contactors controlled  Wiring to the contactor  Check the continuity for
by this unit is/are not wiring is open circuit. any open circuit.
turning ON/OFF  Contactor control circuit  Check the common
even if front LCD fuses are blown or MCB’s terminal of relay.
indication shows gets damaged.  Replace the fuses/MCB in
correct.  Relays in SPF3-08M control circuit.
module faulty.  If above all is in OK
condition replace the
SPF3-08M relay new one.
Lots of faults that are seen as faults are due to wrong parameter setting.
It is recommend that by going through the details on parameters setting explained in the
manual, set them correctly.

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