Digital Multi Function Meter

™ Digital Multi Function Meter
Manual for Installation and Use
Measurement of Energies
Maximum Demand measurement
Programmable features
Separate models for Unidirectional and bidirectional measurement
Suitable for 50Hz & 60Hz supply
Class 1 and 0.5 meters available
With RS485 MODBUS & without RS485 MODBUS communication
With Relay & without Relay
Freeze mode feature
Navigation for ease of display parameter scroll
L&T Electrical & Automation
Doc. No. 4D060193 Rev.
L
1
™ Digital Multifunction Meter
Table of Contents
Sl. No.
1
2
3
4
5
6
Descriptions
General Details
Front Panel Details
Mechanical Dimensions
Installations
Programming the meter
Warranty & Disclaimer
Appendix 1: Technical Specifications
Appendix 2: Modbus communication details
Appendix 3: Addressing in Modbus
Appendix 4: Display Parameters
Appendix 5: Catalogue Number
Page No.
2
2
4
4
5
6
6
7
8
11
16
1. General Details:
™ is a digital panel meter for measuring electrical parameters with multiple displays in
size 96 x 96 mm. The meter is designed with high performance processor to combine measurements of
both instantaneous and cumulative values in an electrical system. The device is built with bright 7
segment displays and provides high-resolution value of various parameters. The parameters can be scrolled
up & down by front panel push buttons. The parameters like CT / PT ratings, baud rates, port address,
demand parameters etc, can set by push buttons on the front panel as well through as Modbus protocol
(RS485). The programming parameters are password protected. Meter is provided with measurement
energies, MDs with programmable integration period. The unique feature of Multi Function meters, it is
provided with two relays which are used to trip circuits/isolate circuits in case of predefined
fault/threshold conditions. Relays & RS485 are available for specific models only.
2. Front Panel Details:
2.1 Display & LED indications
™ Digital Multi Function Meter features with 7
segment display and LEDs for multipurpose
indications.
1. Bright 7 segment Displays for displaying the
Parameters.
2. LEDs for indicating units (kilo (k), Mega (M) & Giga
(G) values.),LEDs indication for phase’s R,Y & B.
3. LEDs for indicating Reverse of individual phases. If
any of the phases are reversed, the reversed phase
is indicated through LEDs.
4. LEDs for indicating Lead, export and
Communication.
Figure 1: Front view of digital multifunction meter
2.2 Front panel push buttons:
Three push buttons Up
, Down
& Mode
to do following functions:
1. Navigation through display parameters
2. Programming of parameters
3. Increase /Decrease the numeric values during programming
2
2.3 Programming using push buttons
Sl. No
1
2
3
4
5
6
7
8
9
Action with keys
Press up key and down key simultaneously to enter to programming
mode. Meter displays PASS & 0000 with first digit blinking.
Enter the password for user authentication (Default password is
0000). Press mode key. Password can be changed in the
programming mode once meter displays “PASS” (Password).
If password is correct, meter displays ACPt followed by first
programming parameter.
If entered password is incorrect, meter displays PErr & meter will
return to display parameters.
Press up key to scroll the main menu programming pages.
Press mode key to select the page. Parameter default / Previous
value will display.
Press up key to increment the cursor position value
Press down key to shift cursor position to right
i) Press mode key to update the values. “UUPd” will be displayed.
ii) Press up key to accept the entered value/down key to skip the
entered value.
10
Press up & down key to exit programming mode, meter will display
‘ESCP’ & ‘rSEt’ then followed by restart
11
For manual reset press up key and mode key simultaneously in
default screen. Meter displays “rSt” and continued by display
parameter.
12
In Freeze mode, ‘Desired parameter can be monitored continuously’.
1) To enter Freeze mode:
Press DOWN & MODE key simultaneously for 3sec to Freeze the
parameter. The meter displays “diSP StAY On” and then continues to
show display parameter on which it has been freezed.
2) To exit Freeze mode (To Unfreeze):
Press DOWN & MODE key for 3sec, the meter displays “diSP
StAY OFF” and continues to display scroll mode.
3) In case of power fail and resume:
If the freeze mode is activated, on power resume, Meter
Displays “diSP StAY On” and then continue to show display
parameter on which it was freezed.
13
Press Mode key to display parameters block wise
14
Press UP or Down key to scroll within blocks
15
Once block display comes, press Mode key again to display the
parameters under that block
16
Press Mode key to go back to display parameters block wise
Display Status
Pages scrolling
0/1/2/3/4/5/6/7/8/9
---Step i
step ii
“Inst”
( sequence:- “InSt”,
“Pwr”, “Md”, Engy”,
“rst”, Othr”)
Time out for programming mode is 1minute.After time out, meter exits programming mode & restarts.
3
3. Mechanical Dimensions
Figure 2. Mechanical Dimensions
Figure 3. Panel cut out dimension ( 92 x 92 mm)
4. Installations
1. Dimensions of panel cut-out (92mm x 92mm) for mounting Multi Function is shown in Figure 3. Care to
be taken for proper connection.
2. Auxiliary voltage:Multi Function meter will power ON with auxiliary voltage(Range from 80V to 300VAC).
3.
™ Multi Function meter is suitable for operating in Star connected system and Delta connected
system. For connection refer Figure 4. The meter should be programmed appropriately for the type of
system. The default setting is for 3P4W system. To change the settings to 3P3W configuration mode,
change “cnfg” setting from “0000” to “0001” in programming mode. Refer section 5.2 for details.
4. The rating of input measurement current is 5A (maximum current rating is 6A).In case of higher current
measurement, external Current Transformers (CT) to be used. The CT ratios need to be programmed
appropriately. Refer section 5.2 for programming details. The ‘terminal S1’->’terminal S2’ is forward
direction and ‘terminal S2’->’terminal S1’ is reverse direction. In case of reverse connection the meter is
capable of detecting the reverse connection & will indicate through reverse LEDs. In case of Model C the
forward direction is based on majority current lines. The reverse current detection logic is applicable for
3P4W connection only.
5. Maximum measuring input voltage is 300V phase to neutral. External potential transformers are to be
used for high voltage measurement (HV/MV systems). The PT ratios need to be programmed in the meter
suitably. Refer section 5.2 for programming details.
6. The meter is provided with two relays, to trip circuits in case of fault\threshold conditions. The setting
for fault conditions can be decided by the customer. The default factory settings are available in section
5.1. Relay terminals for relay 1 is RL1C, RL1N and for relay 2 is RL2C, RL2N. Refer section A.1.2(Applicable
for specific models only).
7. The parameters on display can be monitored remotely using RS485 communication. The terminal
connections of RS485 are D+ & D-. Modbus protocol is implemented with RS485 communication. The
communication parameters need to be programmed appropriately. For connections details, settings &
memory map refer section 5.1 and Appendix 2.
4.1 Installations
Model A meters: Terminal
connection 17 & 18 not applicable
3P3W connection: Neutral wire
(Terminal 1) & Y Current (Terminal
13 & 14) not to be connected.
Figure 4 3P4W connection
Check these programming parameters during installation: CTPT ratios, System configuration (3P3W or
3P4W) mode, MD integration period, Relay operation setting if applicable & RS485 communication setting
if applicable.
4
5. Programming the meter
5.1 List of relay programming parameters
Meter is programmed with default factory settings. These parameters can be changed by authenticated
user/customer. Relay features are available for specific models only. Refer page 16 for the same.
Sl. No.
#
1
#
2
Parameter
Lower Voltage cut off Limit
Min / Max Value
Upper Voltage cut off Limit
264.0V
Display
Factory setting
9.6V
9.600V
264.0V
π
3
Lower Current cut off Limit
0.1A/0.02A
4
Upper Current cut off Limit
5.867A/1.1734A
5
Lower Frequency cut off Limit
40.0Hz
40.00Hz
6
Upper Frequency cut off Limit
70.0Hz
70.00Hz
7
Relay cut-off occurrence persistence time
1 – 9999 s
15 seconds
0.100A/0.02A
π
π
5.867A/1.1734A
π
Relay cut off restoration persistence time
8
1 – 9999 s
15 seconds
‘π’ indicates applicable for -/1A meter(otherwise -/5A meter)
#
Relay cut-off limits is not applicable for 3P3W system, the immediate below table is applicable.
Sl. No.
1
2
Parameter
Min / Max Value
Lower Voltage cut off Limit
Upper Voltage cut off Limit
Display
16.62V
457.2V
Factory
setting
16.62V
457.2V
To disable the condition/parameter specific relay trip, set that specific parameter(s) to zero.
5.2. List of programming parameters
Sl. No.
1
Min / Max Value
Display
Factory
setting
1
Slave ID
1- 247
Baud rate
9600 & 19200
9600
Parity
Odd/Even/None
Even
3
CT Primary
Max up to 9999
1
4
CT Secondary
1A or 5A
1
5
PT Primary
Max up to 9999
1
6
PT Secondary
Max up to 9999
1
7
Meter wiring configuration
0000 for 3P4W,0001 for 3P3W
0000
8
Programming Password
0000 to 9999
0000
9
Number of poles
MD Active Integration period
(Model B/Model C)
2,4,6,8,10,12,14,16
2
10α
‘α’
Parameter
2
30
Minutes
1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
11α
MD Apparent Integration
Period (Model B/Model C)
1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
30
Minutes
12α
MD Current (I) Integration
Period (Model B/Model C)
1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
30
Minutes
13
Command to clear the Power fails count (rest Intr).
Step 1: Press mode key meter displays “CnFn reSt”.
Step 2: Press mode key meter displays “UUPd”.
Step 3: Press up key meter displays ACPt.
Applicable for Model B &C only
Note :-  Ct Pr X Pt Pr  ≤ 10000000
 CtSE
PtSE 
5
Step 1:
Step 2:
Step 3:
6. Warranty and Disclaimer
6.1 Warranty
Larsen & Toubro warrants that Digital Multi Function meter is free from defects in workmanship and
material. Larsen & Toubro’s obligation under this warranty shall be for a period of 18 months 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 or 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 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.
6.2 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.
Appendix 1: Technical Specifications
A.1.1 Specifications
Auxiliary supply
Auxiliary burden
Class of accuracy
Input current
measurement range
Current range for
accuracy class
-/5A
-/1A
-/5A
-/1A
Class 1
Auxiliary
circuit
Measurement
circuit
Class 0.5
Class of accuracy
Input current
measurement range
Current range for
accuracy class
-/5A
-/1A
-/5A
-/1A
Line frequency measurement range
Measurement circuit burden
Input voltage measurement range
Voltage range for class of accuracy
Insulation
properties
Electrical
requirements
Impulse voltage test
AC voltage Test
Insulation resistance
Test of power consumption
Voltage dips and interrupts
Short time over current Protection
6
80 to 300VAC
< 4VA
1.0$ as per IEC 62053-21
40mA to 6A
40mA to 1.2A
250mA to 6A
50mA to 1.2A
Active Energy 0.5$ as per IEC 62053-22
Reactive Energy 1.0 as per IS14697:2004
40mA to 6A
40mA to 1.2A
250mA to 6A
50mA to 1.2A
50Hz ± 10% & 60Hz ± 10%
(Suitable for both 50Hz & 60Hz supply)
< 0.2VA per phase
10V to 300V(P-N)
17.32V (P-P) to 520V (P-P)
57.7V (P-N) to 277V (P-N)
100V (P-P) to 480V (P-P)
±4kV as per IEC 62053-21
4kV double insulation as per IEC 62053-21
500V DC Voltage as per IS 13779
As per IEC 62053-21
As per IEC 61326-1
20 times of Imax for half a second as per
IEC 62053-21
ElectroMagnetic
Compatibility
(EMC)
Operating
Conditions
Mechanical
testing
‘$’
Electrical fast transient/burst immunity
test
±4kV as per IEC 61000-4-4
Electrostatic discharge immunity test
±8kV air discharge , ±6kV contact
discharge as per IEC 61000-4-2
Radiated, radio-frequency,
electromagnetic field immunity test
Immunity to conducted disturbances,
induced by radio-frequency fields
Surge immunity test
Rated power frequency magnetic fields
Emission
Operating Temperature
Storage Temperature
Humidity
Shock
Vibration
Casing
Weight
Available in separate Models
10 V/m as per IEC 61000-4-3
3V as per IEC 61000-4-6
±4kV as per IEC 61000-4-5
1A/m as per IEC 61000-4-8
Class B as per CISPR 22
0 º C to +55 º C
-20 º C to +70 º C
0 to 95% relative humidity non-condensing
40g in 3 planes
10 to 55Hz,0.15mm peak amplitude
Plastic mould protected to IP51 from front
side
400gms(approximately)
A.1.2 Relay specifications:
Multi Function meter is provided with two normally closed (NC) relays which can be programmed
to trip in abnormal system conditions. There will be continuity between the contacts RL1C & RL1N and
continuity between the contacts RL2C & RL2N in system healthy condition. The relay trip option can be
disabled for one or all of the parameters by setting the corresponding parameter(s) to zero.
The relay setting can be programmed for the following fault condition.
1. Abnormal voltage
2. Abnormal current
3. Abnormal frequency
The abnormal voltage, current & frequency can be decided by the customer. The upper & lower limit can
be programmed appropriately. Refer section 5.1 for details.
Relay specifications
Continuous Contact Rating
5A
Maximum Switching Voltage
277V
Maximum Switching Current
5A
Maximum Switching Power
Figure 6 Relay Contacts
1250VA
Note: Relay option is applicable to selected models only.
Note:
Relay option
applicablecommunication
to selected models only.
Appendix
2: isModbus
details
A.2.1 Introduction:
The Default slave ID is 1, baud rate is 9600 & parity is EVEN. In Case of multiple meters connected
in a network, the slave IDs to be unique to network. RS485 Modbus protocol allows up to 247 meters to be
connected in a network. But the driver of RS485 allows only 32 meters to be connected in a network.
Repeaters shall be connected to improve the signals strength for longer distance network. Figure 7 shows
the typical network connection for RS485 communication. Repeaters are not shown in figure7 for
simplicity. The value of the termination resistor should be equal to the cable impedance. The cable
impedance can be obtained from the cable manufacturer.
7
In case value of cable impedance is not known, usually 120Ω, 0.5W resistor will work fine. The function of
the termination resistor is to reduce the reflection of signals at the ends.
Figure 7. Typical connection diagram of RS485
A.2.2 Modbus Address Map for Data read /write:
1. Maximum bytes that can be collected in single query - 180 Bytes
2. Recommended no response timeout – 400 milli Second
3. Updating rate for each parameter is 3 Second, so recommended polling frequency anything
above 3 Second is preferred.
Appendix 3: Addressing in Modbus
For changing any programming parameter through Modbus, first password has to be entered then followed
by the address of the parameters. Once password is entered the password is enabled for an idle time of 2
minutes.
Address
40513
40337
40338
42305
41025
41026
41027
42561
41281
41283
41285
41287
Parameters
Password (PRIDES) for programming
Words
3
MF
--
Data Type
ASCII Value
Address
Parameters
Words
H-REGS Function code 0x06 is used for writing for following parameters
1.Relay Occurrence / Persistence Time
Relay Occurrence time (in Seconds)(0001 to 9999)
1
Relay Persistence time (in Seconds)(0001 to 9999)
1
2.Meter Configuration (3W/4W)
0000 for 3-Phase 4-Wire Configuration
1
0001 for 3-Phase 3-Wire Configuration
Function code 0x06 or 0x10 is used for writing for following parameters
3.Communication Parameters (password not required)
Meter Address (1 to 247)
1
Baud Rate (Only following values are possible
1
Write 6 for 9600, 7 for 19200)
Baud parity
0-none, 1- odd, 2 – even.
1
(Only following values are possible while writing)
4.No of Poles
No of Poles (2 to 16)(only even values)
1
Function code 0x10 is used for writing for following parameters
1.External CT/PT Values
CT Primary (1 to 9999)
2
CT Secondary (1A or 5A)
2
PT Primary (1 to 9999)
2
PT Secondary (1 to 9999)
2
MF
Data type
1
1
integer
integer
1
1
1
integer
integer
integer
integer
1
1
integer
1
1
1
1
integer
integer
integer
integer
Ct Pr
Pt Pr 
Note:- max. 
 CtSE X PtSE  ≤ 10000000

40769*
40770*
40849*

2. MD Information
MD1(Apparent MD) - Integration Period
1
1
integer
MD2(Active MD) - Integration Period
1
1
integer
MD Current-Function code 0x06 is used for writing for following parameter
MD3(Current MD)- Integration Period
1
1
integer
(While programming, MD1& MD2 integration periods have to be programmed together. Individual
programming is not supported.MD3 can be programmed separately.)
8
40257
40258
40259
40260
40261
40262
30001
30003
30005
30007
30009
30011
30013
30015
30016
30018
30019
30021
30022
30024
30025
30027
30028
30030
30031
30033
30034
30036
30037
30039
30040
30042
30044
30046
30048
30049
30051
30052
30054
30055
30057
30059
30061
30063
30065
30067
30069
30071
30073
30075
30077
30079
30081*
30083*
30085*
30087*
30089*
30091*
30093*
3.Relay Cut off Limits
Voltage Lower Limit(VL) (9.6<VL<VU)
1
0.01
integer
Voltage Upper Limit(VU) (VL<VU<264)
1
0.01
integer
Current Lower Limit(CL) (0.1<CL<CU)
1
0.01
integer
Current Upper Limit(CU) (CL<CU<5.867)
1
0.01
integer
Frequency Lower Limit(FL) (40<FL<FU)
1
0.01
integer
Frequency Upper Limit(FU) (FL<FU<70)
1
0.01
integer
For all the above relay cut off limits, if value is programmed to zero then that parameter won’t be
considered for relay operations. (ZERO is a valid input value).All programming to be done together.
I-REGS Read Only Registers (Function Code: 0x04)
1.Instantaneous Values
R Phase Voltage
2
0.01
integer
Y Phase Voltage
2
0.01
integer
B Phase Voltage
2
0.01
integer
R Phase Current
2
0.001
integer
Y Phase Current
2
0.001
integer
B Phase Current
2
0.001
integer
Active Power R Phase
2
0.0001
integer
Active Power R Phase(unit)
1
1
integer
Active Power Y Phase
2
0.0001
integer
Active Power Y Phase(unit)
1
1
integer
Active Power B Phase
2
0.0001
integer
Active Power B Phase(unit)
1
1
integer
Reactive Power R Phase
2
0.0001
integer
Reactive Power R Phase(unit)
1
1
integer
Reactive Power Y Phase
2
0.0001
integer
Reactive Power Y Phase(unit)
1
1
integer
Reactive Power B Phase
2
0.0001
integer
Reactive Power B Phase (unit)
1
1
integer
Apparent Power R Phase
2
0.0001
integer
Apparent Power R Phase(unit)
1
1
integer
Apparent Power Y Phase
2
0.0001
integer
Apparent Power Y Phase(unit)
1
1
integer
Apparent Power B Phase
2
0.0001
integer
Apparent Power B Phase(unit)
1
1
integer
Power Factor R Phase
2
0.001
integer
Power Factor Y Phase
2
0.001
integer
Power Factor B Phase
2
0.001
integer
Total Active Power
2
0.0001
integer
Total Active Power(unit)
1
1
integer
Total Reactive Power
2
0.0001
integer
Total Reactive Power(unit)
1
1
integer
Total Apparent Power
2
0.0001
integer
Total Apparent Power(unit)
1
1
integer
Total Power Factor
2
0.001
integer
Line Frequency
2
0.01
integer
RY-Line Voltage
2
0.01
integer
YB-Line Voltage
2
0.01
integer
BR-Line Voltage
2
0.01
integer
Average Phase Voltage
2
0.01
integer
Average Phase Current
2
0.001
integer
R Phase Voltage Harmonic
2
0.01
integer
Y Phase Voltage Harmonic
2
0.01
integer
B Phase Voltage Harmonic
2
0.01
integer
R Phase Current Harmonic
2
0.001
integer
Y Phase Current Harmonic
2
0.001
integer
B Phase Current Harmonic
2
0.001
integer
Phase Difference-R Voltage & Current
2
0.01
integer
Phase Difference-Y Voltage & Current
2
0.01
integer
Phase Difference-B Voltage & Current
2
0.01
integer
Voltage Unbalance R Phase
2
0.001
integer
Voltage Unbalance Y Phase
2
0.001
integer
Voltage Unbalance B Phase
2
0.001
integer
Current Unbalance R Phase
2
0.001
integer
9
30095*
30097*
30099*
30101*
30103*
30105*
30107*
30109
30112
30115
30118
30121**
30124**
30127**
30130**
30133*
30135*
30136*
30138*
30139**
30141**
30142**
30144**
30145*
30147*
30148*
30150*
30151**
30153**
30154**
30156**
30157
30160
30163
30166
30169**
30172**
30175**
30178**
30181*
30183*
30184*
30186*
30187**
30189**
30190**
30192**
30193
30194
30196
30198**
30200
30202**
30204
30205*
30206*
30207*
Current Unbalance Y Phase
2
0.001
Current Unbalance B Phase
2
0.001
Percentage Load R Phase
2
0.01
Percentage Load Y Phase
2
0.01
Percentage Load B Phase
2
0.01
RPM
2
1
Neutral Current
2
0.001
2.Read Cumulative Energies. ( 5 Bytes for value + 1 byte for unit) ref page 11 Note 3
Import Apparent energy + unit
3
0.01
Import Active energy+ unit
3
0.01
Import Reactive Lag energy +unit
3
0.01
Import Reactive Lead energy +unit
3
0.01
Export Apparent energy + unit
3
0.01
Export Active energy +unit
3
0.01
Export Reactive Lag energy +unit
3
0.01
Export Reactive Lead energy +unit
3
0.01
3.Read MD
MD Import Apparent
2
0.0001
MD Import Apparent (unit)
1
1
MD Import Active
2
0.0001
MD Import Active(unit)
1
1
MD Export Apparent
2
0.0001
MD Export Apparent (unit)
1
1
MD Export Active
2
0.0001
MD Export Active(unit)
1
1
4.Read Rising Demand
Import Apparent Rising Demand
2
0.0001
Import Apparent Rising Demand(unit)
1
1
Import Active Rising Demand
2
0.0001
Import Active Rising Demand(unit)
1
1
Export Apparent Rising Demand
2
0.0001
Export Apparent Rising Demand(unit)
1
1
Export Active Rising Demand
2
0.0001
Export Active Rising Demand(unit)
1
1
5.Cumulative Energy Backups ( 5 Bytes for value + 1 byte for unit) ref page 11 Note 3
Import Apparent Energy +unit
3
0.01
Import Active Energy +unit
3
0.01
Import Reactive Energy – lag +unit
3
0.01
Import Reactive Energy – lead +unit
3
0.01
Export Apparent Energy +unit
3
0.01
Export Active Energy+unit
3
0.01
Export Reactive Energy – lag +unit
3
0.01
Export Reactive Energy – lead +unit
3
0.01
6.Read MD Backup
MD Import Apparent Backup
2
0.0001
MD Import Apparent Backup(unit)
1
1
MD Import Active Backup
2
0.0001
MD Import Active Backup(unit)
1
1
MD Export Apparent Backup
2
0.0001
MD Export Apparent Backup(unit)
1
1
MD Export Active Backup
2
0.0001
MD Export Active Backup(unit)
1
1
7.Other Parameters
No. of Resets
1
1
Total Forward Load Time (Days(1) + hr(1))
2
1
Total Power On Time (Days(1) + hr(1)
2
1
Total Reverse Load Time (Days(1) + hr(1)
2
1
Total Forward Load Time Backup (Days(1) + hr(1)
2
1
Total Reverse Load Time Backup (Days(1) + hr(1)
2
1
Total Power Fail Count
1
1
8.Time Remaining
Time Remaining KVA MD (Import and Export)
1
1
Time Remaining KW MD (Import and Export)
1
1
Time Remaining Current MD
1
1
10
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
integer
30208*
30209*
30211*
30212*
30214**
30215**
30217**
30218**
30220*
30221*
30223*
30225*
30226*
30228*
30229*
30231*
30232
30236
30240
30244
9.Hour MD Occurred
Hour Import KVA MD Occurred (days)
1
1
integer
Hour Import KVA MD Occurred(1st word hour+2nd word minute)
2
1
integer
Hour Import KW MD Occurred(days)
1
1
integer
Hour Import KW MD Occurred(1st word hour+2nd word minute)
2
1
integer
Hour Export KVA MD Occurred (days)
1
1
integer
Hour Export KVA MD Occurred(1st word hour+2nd word minute)
2
1
integer
Hour Export KW MD Occurred(Days)
1
1
integer
Hour Export KW MD Occurred(1st word hour+2nd word minute)
2
1
integer
Hour Current MD Occurred(Days)
1
1
integer
Hour Current MD Occurred(1st word hour+2nd word minute)
2
1
integer
10.Current MD
Read Current MD
2
0.0001
integer
Read Current MD(unit)
1
1
integer
Read Current Average Demand
2
0.0001
integer
Read Current Average Demand(unit)
1
1
integer
Read Current MD Backup
2
0.0001
integer
Read Current MD Backup(unit)
1
1
integer
11. Energy values with high precisions (without multiplying CTPT value) ref page 11 Note 4
Import Apparent energy
double
4
Import Active energy
double
4
Import Reactive Lag energy
double
4
Import Reactive Lead energy
double
4
-
* Applicable for model B & C only. ** Applicable for model C only.
Note 1: 0- No Scale(x10^0), Unit 1-KILO(x10^3), Unit 2-MEGA(x10^6), Unit3-GIGA(x10^9).
When no value (empty register) is to be displayed in Modbus, then not applicable value will be displayed
A410 (-23536).Then multiplication factor is not applicable.
Note 2: Response for addresses 30007 to 30028, 30040 to 30049 & 30055
1st Word
2nd Word
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
x
1
Represents the Modbus data Value
If X is 0, then Modbus data value is positive.
If X is 1, then Modbus data value is negative and it is in 2’s Complement form.
Note3: Cumulative Energy and its Backups - Address = 30109 to 30130 and 30157 to 30178
Ex: For import apparent energy (30109 to 30111), 3 word length. Each word is of 2 bytes.
30109 – 1st Byte (Most Significant Byte of value), 2nd Byte
30110 – 3rd Byte, 4th Byte
30111 - 5th Byte (Least Significant Byte of value), 6th Byte is unit
Not applicable parameters: Export energies are not applicable for model A and model B, not applicable
value will be displayed (00 00 00 A4 10 00).It is recommended to check unit value. If unit value is 00, then
that parameter is not applicable.
Note 4: Energy values with high precisions (30232 to 30244)
These parameters should be read as double value of 8 byte size, without MF factor. This value shall be
multiplied by CTPT ratio to get actual value.
Appendix 4: Display Parameters
4 Display Features: On Power ON, following will be displayed sequentially:
1) All the segments of 7 segment display and all the LEDs will glow
2) The firmware version
3) Display parameters
The meter has a provision to scroll the display parameters automatically after ~3 seconds. The
meter enters into the manual mode by up/down key press. In manual mode, display shall scroll
up & down by every up & down key press respectively. If key is not pressed for ~1 minute, it
returns to auto scroll mode. Any display parameter can be monitored continuously using ‘freeze
mode’ feature.
The display parameters are divided into 6 blocks:
11
(a) Instantaneous Parameters(InSt) (b) Power(PYr) (c) MD (Md) (d) Energy(EngY) (e) Backup(rSt)
(f) Others(Othr) . Meters shall be in normal mode (Auto/manual) as existing.
On pressing mode key, the display will show Inst, which corresponds to instantaneous parameters. On
pressing the mode key the display will start from 1 (Starts in manual mode, with standard time out of 1
min). On time out, the meter goes to auto scroll starting from the last display.
To move to different block, up and down arrow will be used for scrolling.
Example (Model C): Move from Frequency (Parameter 6) to Apparent Energy (parameter 39)
•
•
•
•
Press
Press
Press
Press
mode key. Display will show INST
the down key 3 times to get ENGY
mode key. Display screen will now show active energy(parameter 38)
down key to move to parameter 39.
Meter will now be in this screen until a key is pressed for scrolling or manual scroll time out occurs (1min).
In case of latter, meter resorts to auto scroll mode of the entire display list.
Energy display format:
Unit
Min Display
SL
MF (CTxPT)
Display Format
Maximum value
Range
Resolution
999999.99 KWh
1
< 10
XXXXXX.XX
0.01 kWh
k
9999999.9 KWh
2
< 100
XXXXXXX.X
0.1 kWh
99999999 KWh
3
≤1000
XXXXXXXX
1 kWh
999999.99
MWh
4
< 10,000
XXXXXX.XX
0.01 MWh
M
9999999.9 MWh
5
< 1,00,000
XXXXXXX.X
0.1 MWh
99999999 MWh
6
< 10,00,000
XXXXXXXX
1 MWh
G
999999.99 GWh
7
≤ 1,00,00,000
XXXXXX.XX
0.01 GWh
When any energy value exceeds the maximum value for selected CTPT ratio, then that particular energy
rolls over and starts accumulating fresh from 0.
All Power, MD and Rising Demand are displayed in same format as energy (Display format and unit are
fixed depending on the CTPT ratio).
Parameter
Phase voltage (V)
Line to line
voltage (V)
Instantaneous Parameters
Phase Current(A)
Average Voltage(V)
Average current(A)
Neutral Current(A)
Line Frequency(Hz)
Percentage Load
Voltage
Unbalance(V)
Current
Unbalance(A)
RPM
Display
Line1
Display Line2
U1
U1 Value
U12
U12 Value
A1
A1 Value
AU
AU Value
An
U2
U2 Value
U23
U23 Value
A2
A2 Value
AA
AA Value
An Value
U3
U3 Value
U31
U31 Value
A3
A3 Value
F
PLd1
PLd1
Value
Uub1
Uub1
Value
Iub1
Iub1 Value
F Value
Blank
PLd2
PLd2 Value
PLd3
PLd3 Value
Uub2
Uub2 Value
rPM
Display
Line3
Display
LED
Indication
Display
sequence
§
A
B
C
R,Y,B
1
1
1
R,Y,B
2
2
2
R,Y,B
3
3
3
R,Y,B
4
4
4
5
5
6
6
R,Y,B
7
7
Uub3
Uub3 Value
R,Y,B
8
8
Iub2
Iub2 Value
Iub3
Iub3 Value
R,Y,B
9
9
rPM Value
Blank
10
10
12
Blank
Blank
5
6
Power factor R
,Y,B phase
System Power
factor
Power
Phase Angle
Active Power R
,Y,B phase
PF-2
PF-2 Value
PF-3
PF-3 Value
7
11
11
PF-t
PF-t Value
Blank
8
12
12
PA1
PA1 Value
W1
W1 Value
PA2
PA2 Value
W2
W2 Value
W-t
(MSB)
UA2
UA2 Value
UA-t Value
(MSB)
UAr2
Value
UArt Value
(MSB)
PA3
PA3 Value
W3
W3 Value
W-t
(LSB)
UA3
UA3 Value
UA-t Value
(LSB)
UAr3
Value
UArt Value
(LSB)
13
13
9
14
14
10
15
15
11
16
16
12
17
17
13
18
18
14
19
19
20
20
21
21
Total active power
W-t
Apparent Power R
,Y, B phase
Total apparent
power
Reactive Power
R,Y,B phase
Total reactive
power
UA1
UA1 Value
UA-t
UAr1
Value
UArt
R,Y,B
R,Y,B
kilo
R
kilo
R,Y,B
kilo
R
kilo
R,Y,B
kilo
R
kilo
MD Import Active
MD
Value
W
Value
Blank
Occurrence Time
of MD Import
Active
MD
Days
W
Hours
TIME
Minutes
MD
Value
W
Value
Blank
Exp, R
kilo
22
Occurrence Time
of MD Export
Active
MD
Days
W
Hours
TIME
Minutes
Exp
23
MD Apparent
MD
Value
VA
Value
Blank
R
kilo
Occurrence Time
of MD Import
Apparent
MD
Days
VA
Hours
TIME
Minutes
MD Export
Apparent
MD
Value
VA
Value
Blank
Exp, R
kilo
26
Occurrence Time
of MD Export
Apparent
MD
Days
VA
Hours
TIME
Minutes
Exp
27
MD
I
Value
24
28
Occurrence Time
of MD Current
MD
Days
I
Hours
TIME
Minutes
25
29
Rising MD Import
Active
RD
W
Value
R
kilo
26
30
Rising MD Export
Active
RD
W
Value
Exp, R
kilo
MD Export Active
MD
PF-1
PF-1 Value
MD Current (I)
13
R
kilo
22
24
23
25
31
Remaining Time of
MD Active (Import
and Export)
RT
W
n.xx
Minutes
Rising MD Import
Apparent
RD
UA
Value
R
kilo
RD
UA
Value
Exp, R
kilo
Remaining Time of
MD Apparent
(Import and
export)
RT
UA
n.xx
Minutes
29
35
Rising current(I)
MD
RD
I
Value
30
36
Remaining Time of
MD Current
RT
I
n.xx
Minutes
31
37
Import Active
Energy
Wh
Value
<MSB>
Value
<LSB>
R
kilo
15
32
38
Import Apparent
Energy
UAh
Value
<MSB>
Value
<LSB>
R
kilo
16
33
39
Import reactive lag
Energy
UArh
Value
<MSB>
Value
<LSB>
R
kilo
17
34
40
Import reactive
lead Energy
UArh
Value
<MSB>
Value
<LSB>
18
35
41
Export Active
Energy
Wh
Value
<MSB>
Value
<LSB>
Lead,
R
kilo
Exp, R
kilo
Export apparent
Energy
UAh
Value
<MSB>
Value
<LSB>
Exp, R
kilo
43
Export reactive
lag Energy
UArh
Value
<MSB>
Value
<LSB>
Exp ,R
kilo
44
Export reactive
lead Energy
UArh
Value
<MSB>
Value
<LSB>
Lead,
Exp, R
kilo
45
Total Import load
run hour Mains
rnh
d.xxx
h.xx
19
36
46
Total Power on
time
tPot
d.xxx
h.xx
20
37
47
Total Power fail
count
Pr
FAIL
Value
21
38
48
Total Export load
run hour Mains
rnh
d.xxx
h.xx
Energy
MD
Rising MD Export
Apparent
14
Exp
27
32
28
33
34
42
49
Backup values
Import Active
Energy backup
rSt
Value
Wh
Value
Blank
R
kilo
22
39
50
Import Apparent
Energy backup
rSt
Value
UAh
Value
Blank
R
kilo
23
40
51
Import Reactive
Lag Energy backup
rSt
Value
UArh
Value
Blank
R
kilo
24
41
52
Import Reactive
Lead Energy
backup
rSt
Value
UArh
Value
Blank
Lead,
R
kilo
25
42
53
Export Active
Energy backup
rSt
Value
Wh
Value
Blank
Exp, R
kilo
54
Export Apparent
Energy backup
rSt
Value
UAh
Value
Blank
Exp, R
kilo
55
Export Reactive
Lag Energy backup
rSt
Value
UArh
Value
Blank
Exp, R
kilo
56
Export Reactive
Lead Energy
backup
rSt
Value
UArh
Value
Blank
Exp,
Lead,
R
kilo
57
MD Import Active
backup
rSt
Value
MD
Value
W
R
kilo
MD Export Active
backup
rSt
Value
MD
Value
W
Exp, R
kilo
MD Import
Apparent backup
rSt
Value
MD
Value
UA
R
kilo
MD Export
Apparent backup
rSt
Value
MD
Value
UA
Exp, R
kilo
MD Current backup
rSt
Value
MD
I
Total load run hour
Backup
rSt
d.xxx
rnh
h.xx
Blank
Total Export load
run hour Backup
rSt
d.xxx
rnh
h.xx
Blank
15
43
59
44
60
61
26
Exp
58
45
62
46
63
64
Others
Phase Distortionvoltage
UH1
Value
UH2
Value
UH3
Value
Distortion-phase
Current
AH1
Value
AH2
Value
AH3
Value
Modbus Slave ID
Sl.Id
Value
Blank
Modbus comm.
Baud rate and
parity
Baud
Value
Parity
No. of resets
n.rSt
Value
Blank
R,Y,B
27
47
65
R,Y,B
28
48
66
29
49
67
30
50
68
31
51
69
R
kilo
MSB: Most Significant Bit, LSB: Least Significant Bit, § Blank cells denote feature not applicable for that
model. In LED indication column -Unit led will change to k/M/G depending on the value, the unit of
energy is fixed depending on the CTPT ratio.
Model A & Model B are unidirectional meters and Model C is bi-directional meter.
Second letter from right in Catalogue number represents the model. For example WDM303FDWA0
represents Model A.
Sl. No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Note: All
Variant
MF model A with relay -/1A
MF Model B with relay -/1A
MF Model C with relay -/1A
MF model A with relay -/5A
MF Model B with relay -/5A
MF Model C with relay -/5A
MF model A without relay -/1A & -/5A
MF Model B without relay -/1A & -/5A
MF Model C without relay -/1A & -/5A
MF model A without relay -/1A & -/5A (without RS485)
MF Model B without relay -/1A & -/5A (without RS485)
MF Model C without relay -/1A & -/5A (without RS485)
MF model A without relay -/1A & -/5A
MF Model B without relay -/1A & -/5A
MF Model C without relay -/1A & -/5A
the Models are with RS 485 except (10, 11&12)
Class
1
0.5
Catalogue Number
WDM303ODWA0
WDM303ODNB0
WDM303ODNC0
WDM303FDWA0
WDM303FDNB0
WDM303FDNC0
WDM303FDWA1
WDM303FDNB1
WDM303FDNC1
WDM303FDWAX
WDM303FDNBX
WDM303FDNCX
WDM313CDWA1
WDM313CDNB1
WDM313CDNC1
L&T Electrical & Automation
Manufactured by:
L&T Electrical & Automation
Larsen & Toubro
KIADB Industrial Area
Hebbal, Hootagalli
Mysore 570018
Karnataka, INDIA
 2015 L&T Electrical & Automation
16