Dual Source Meter
3 Phase 4 Wire LT operated CT
USER MANUAL
L&T Electrical & Automation
Doc. No. 4D060151 Rev E.
1. Technical Specifications
Enclosure Engineering Plastic complying to IP-51
Dimension 96 X 96 X105 mm (HXWXD)Panel Cutout: 92 X 92 mm
Connection 3P 4W
Display LCD with Backlit
Type kWh Meter
Measurements kWh / kW / Frequency/ Voltage / Current
Starting Current 0.2% of rated current (5A)
Class of Accuracy Class 1.0
Current 5A (rated), 10A (max)
Voltage (P-N) 3 X 240 V (-30 % to +20 % of Vref)
Frequency 50 Hz ± 5%
Auxiliary Supply 88V TO 300 V AC/DC
DG Sensing Input 10V-60V DC/20V-300V AC
Weight(approximate) 470 g
Weight with Packaging 630 g
(approximate)
2. Standards Applicable
Accuracy : IEC62053-21 (Class 1.0)
Radio Interference : CISPR22
Fast Transient Burst : IEC61000-4-4
Surge Withstand : IEC61000-4-5
ESD : IEC61000-4-2
Impulse Voltage : IEC62052-11
3. Dual Energy Registers
Two separate energy registers are provided, one for EB (Electricity Board supply) and another for
G(Generator Supply).Normally meter accumulates energy in EB register. Whenever the DG sensing
signal (10 to 60V dc /20 to 300V ac) is present, meter accumulates energy in G register. Separate
LED indication is provided on the meter front Panel,which glows when DG sensing signal is present.
4. Power On Display
Display check will be the first display when meter is powered ON.
Followed by meter serial number and then firmware version will be displayed.
5. Display Modes
1) Auto Scroll Mode
By default meter will be in auto-scroll mode. All the display
parameters will be scrolling automatically in this mode. Scrolling
period for two energy parameters is 8 sec and 2 sec for all other
parameters.
2) Toggle Mode
Press and hold SELECT Key to move to Energy-toggle mode. The display
will alternately show“Generator energy”(indicated “G” on LCD display)
and “Electricity Board energy” (indicated“Eb” on LCD display. There is
no time out period in this mode. To exit from this mode press up/down
key.
3) Manual Scroll Mode
Press UP/DOWN Key to Scroll Manually. In this mode all the parameters
can be scrolled through manually. If no key is pressed for 1 minute,it
will go back to auto scroll mode.
4) Freeze Mode
To see the selected parameter continuously,press up & down buttons together
for 2 seconds. There is no time out period for freeze mode.Press up or down
button to come out of Freeze mode.The meter will go back to its previous
scroll mode(auto/manual).Freeze mode is not available in toggle mode.
6. Display Parameters
1.Cumulative Energy KWh
2.Cumulative Gen. Energy KWh
3. Average Voltage
4. Average Current
5. Total Active Power
6. Frequency
7. R Phase Voltage
8. Y Phase Voltage
9. B Phase Voltage
10. R Phase Current
11. Y Phase Current
12. B Phase Current
13. R Phase Active Power
14. Y Phase Active Power
15. B Phase Active Power
16. Phase Sequence
17. Power on duration (ddddd.hh.mm) - Eb Cumulative
18. Power on duration (ddddd.hh.mm) - Eb Resettable
19. Power on duration (ddddd.hh.mm) - G Cumulative
20. Power on duration (ddddd.hh.mm) -G Resettable
21. Slave id
22. Baud rate
23. Parity
Note:
· Power on duration will be incremented only when Phase voltage is present. Time will not be
incremented if meter is powered on in Aux voltage without any phase voltage
· Press SELECT key and DOWN key together to see the RS-485 parameters(last 3 Display parameters)
7.Entering in to Programming Mode
Press and hold the SELECT and scroll UP key together to move
to the Programming Mode. Press scroll DOWN key (used as
Escape key in programming mode) to come out from the
programming mode. “ESCAPE” will be displayed.
Enter the Password by pressing & holding the scroll UP key.
The default password is “0000”. Press and hold scroll UP
to increment the value of the blinking digit. Press and hold
SELECT and scroll UP together to shift to next digit.
Press SELECT key to enter the password. Password Accepted
('PASS ACPTD') or Password Error ('PASS Err') will be displayed.
Only if password is accepted meter will enter into programming
mode.
The following programming options are available
-Programming CT/PT ratio
-Reset Power on time
-Setting slave Id
-Setting communication port
-Set Password
Meter will not record energy when it is in programming mode.Time out period of 2 min is
provided for programming mode.
8. Communication Port Setting
In the Programming Menu, press and hold scroll UP key
to get “Set Port” and then press SELECT key.
Baud rate selection (1200 to 19200): Use UP key to
select the desired baud rate then press SELECT
key to set. Similarly parity (Even/odd/none)
can be set here.
9. Password Setting
In the Programming Menu, press and hold scroll UP key
to get “Set Pass” and then press SELECT key
Press UP key to change the blinking digit. Press UP and SELECT key
together to shift to next digit. Press SELECT key to save the password
10.Programming CT/PT ratio
In the Programming Menu, press and hold scroll UP key to get
“Ct Pt Ratio” and then press SELECT key.
-Press SELECT key When “Ct Pr 0001” is displayed to
program CT Primary current.
-Press and hold SELECT and scroll UP keys together to shift digit.
-Press scroll UP key to change value.
-Press SELECT key to save change. “L UPdAtE” will’
come in display. Again press select key to store the value.
-Scroll UP and press SELECT key When “Ct Se 0001” is displayed
to program CT Secondary current.
-Same as CT primary, program CT secondary.
-Scroll UP and press SELECT key When “Pt Pr 0001”
is displayed to program PT Primary voltage.
-Press and hold SELECT key and scroll UP key together
to shift digit.
-Press scroll UP key to change value.
-Press SELECT key to save changes. “L UPdAtE” will come in
display. Again press select key to store the value.
-Scroll UP and press SELECT key When “Pt SE0001”
is displayed to program PT Secondary voltage.
-In Same process program the PT Secondary value.
·CT RATIO * PT RATIO should not exceed 999999, if exceeded the meter will display “dAtA Err”
·Pulse Rate = 2500 imp / kWh (for CT * PT ratio = 1).
·Pulse rate will vary if CT/PT ratio is changed
·When CTPT Ratio is programmed ≥1000, energy in Mwh (Mega watthour) will be displayed as “kkWh”
.Decimal points on the display format will be changed according to the CTPT ratio programmed.
11. Reset Power On Time
In the Programming Menu, press and hold scroll
UP key to get “rSt Prt In” and then press Select key.
Press SELECT key to reset the power on duration.
Once reset is done, “rStdnE” will be displayed.
12. Slave ID Setting
In the Programming Menu, press and hold scroll UP to get “Set SL Id”
and then press SELECT key.
Press UP key to increment the SL Id value. Press together UP and
SELECT key to shift to next digit. Press select key to set the id.
Slave id can be set from 1 to 247.
Note: Once the parameters are set, press the DOWN key to come out of the programming mode.
“ESCAPE” will be displayed.This is followed by a “rEstArt” message and the meter gets restarted.
13. Communication Interface Details
RS485 interface is available to communicate with the meter.
The interface is available at the terminals. Refer “CONNECTION DETAILS” diagram.
The configuration details to communicate with the meter are given below
Standard RS485 (half duplex)
Baud Rate Selectable (19200, 9600,4800, 2400, 1200) Default is 9600.
Parity Selectable (None, Odd, Even) Default is Even.
The RS485 interface uses MODBUS Protocol in RTU mode.Communicating with the
meter involves sending commands to the meter for reading and writing the
Protocol
particular register. The meter can be addressed with specific user defined
meter address (Slave ID) from1 to 247
14. Memory Map
Password:
(Function Code 16)
Note: For changing any parameter, first password has to be entered, and then the parameters will
be enabled for writing. Once password is enabled, idle time is 2 minutes and then comes out of
programming mode.
Address Parameters Words
40513 Password for programming (PRIDES) 3
Read Only Parameters:
(Function Code 04)
Address Parameters Words MF
Instantaneous Parameters
30,001 Phase 1 Voltage 2 0.01
30,003 Phase 2 Voltage 2 0.01
30,005 Phase 3 Voltage 2 0.01
30,007 Phase 1 Current 2 0.001
30,009 Phase 2 Current 2 0.001
30,011 Phase 3 Current 2 0.001
30,013 Phase 1 Active Power 2 0.0001
30,015 Phase 2 Active Power 2 0.0001
30,017 Phase 3 Active Power 2 0.0001
30,019 Average Voltage 2 0.01
30,021 Average Current 2 0.001
30,023 Total Active Power 2 0.0001
30,025 Line Frequency 2 0.01
30,027 Cumulative Energy – Forward kWh (EB) 2 0.01
30,029 Cumulative Energy – Forward kWh (DG) 2 0.01
30,031 EB/DG status and Power in Mega/Kilo
2
00:EB and Power in Kilo
01:EB and Power in Mega
10:DG and Power in Kilo
11:DG and Power in Mega
30,033 Cumulative power on time EB Supply in minutes 2 1
30,035 Resettable power on time EB Supply in minutes 2 1
30,037 Cumulative power on time DG Supply in minutes 2 1
30,039 Resettable power on time DG Supply in minutes 2 1
st
For address 07 to 17,23 if MSB (1 word) is 1 then 2's complement of the value is to be
taken.
Read write Parameters:
(Supported by function code 6 and 16 for writing and by function code 3 for reading)
Address Parameters Words MF
Communication Parameters
Meter Address 1 1
42,385
Baud Rate
42,386
2->1200; 3->2400; 4-> 1 1
4800; 5->9600; 6->19200
Parity
42,387 0->None; 1->Odd; 2->Even 1 1
CT PT ratio settings (1 to 999999)
42,049 CT Primary 1 1
42,050 CT Secondary 1 1
42,051 PT Primary 1 1
42,052 PT Secondary 1 1
15. Warranty
Larsen & Toubro warrants that 3 Phase 4 Wire kWh Meter type Gemini is free from defects in workmanship
and material . Larsen & Toubro obligation under this warranty shall be for a period of 1 year from the
date of sale subject to the following terms and conditions provided the notice of defects and
satisfactory proof thereof is given to Larsen & Toubro by its customer within the warranty period.
1. Larsen & Toubro shall provide only repairs for the sold item.
2. Defective parts shall be serviced or replaced by Larsen & Toubro.
This warranty does not cover any defect in the product caused by accident, misuse, mishandling
includes improper electrical, mechanical installation), tamper, neglect, alteration/modification/
substitution of any of the components or parts or any attempt of internal adjustment by unauthorized
service personnel. For applicability of warranty, Larsen & Toubro shall be the sole judge. Under no
circumstance shall Larsen & Toubro Limited be liable for any consequential or resulting injury or for loss,
damage or expense directly or indirectly from the use of this product.The foregoing warranty is in lieu
of all other warranties expressed or implied and is the sole and exclusive remedy for any claim arising
from any defect in the product.
16. Disclaimer
Sufficient care is taken to provide all information regarding the product but Larsen & Toubro
does not claim any responsibility for the damage caused by using the product directly or indirectly.
OVERALL DIMENSIONS (mm) CONNECTION DETAILS
1.Meter connection should be done exactly as shown in above diagram
2.Make the CT connections on terminals 1-2 (R-Ph), 3-4 (Y-Ph) and 5-6 (B-Ph)
3.Make the PT connections on the terminals 9 (R), 10 (Y), 11 (B) and 12 (N)
4.Connect the Auxiliary Supply (88V TO 300 V AC/DC) to the terminals 13 (-ve)
and 14 (+ve) to power ON the meter. It can be done by shorting one phase
with auxiliary as shown in the above picture.
5.Connect the DG sensing input (10V-60V DC/20V-300V AC) on terminal
15 (-ve) & 16 (+ve).
17. Precautions
1.The device must be installed, wired and serviced only by qualified personnel
2.Prior to any work on the device, de-energize the connected circuits before meter
installation and disconnection.
3.Always use an appropriate voltage detection device to confirm the absence of voltage
4.Always supply the device with the correct rated voltage.
5.Failure to take these precautions could cause serious injuries
L&T Electrical & Automation
Manufactured by:
L&T Electrical & Automation
Larsen & Toubro Limited
KIADB Industrial Area
Hebbal, Hootagalli
Mysore 570018
Karnataka, INDIA
© 2013 LARSEN & TOUBRO
In case of complaint, please contact our toll free number 1800 233 5858 or E-Mail us on cic@lntebg.com
