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USERS MANUALFOR

ER300NElectronic Trivector Meter

Class 1.0 / Class 0.5S

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Table of contents

1 General

2 Design

2.1 Theory of Operation

2.1.1 Analog section2.1.2 Digital processing section2.1.3 Power supply

2.2 Hardware

2.2.1 Compact2.2.2 Efficient2.2.3 Ruggedness and Safety2.2.4 User interfaces2.2.5 Data Safety

2.2.5 Features

2.3.1 Energy Accumulators2.3.2 MD Registers

2.3.2.1 Methods of MD calculation2.3.3 Reset

2.3.3.1 Reset modes2.3.3.2 Reset data2.3.4 Instantaneous parameters2.3.5 Programmable features

2.3.5.1 Uni/Bi-directional configuration2.3.5.2 VAh calculation methods2.3.5.3 External CT/PT ratios2.3.5.4 CT Tapping

2.3.5.5 MD settings2.3.5.6 Reset settings2.3.5.7 RTC setting2.3.5.8 Display details2.3.5.9 Unitcode setting

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2.3.6 Communication2.3.6.1 Data collection2.3.6.2 Programming

2.3.7 Accuracy tests2.3.7.1 Pulse counting method2.3.7.2 High resolution method

3. Installation

3.1 Incoming Inspection3.2 Re-packing

3.3 Optimum field conditions3.4 Storage3.5 Mounting3.6 Extra precautions3.7 Connections

4. APPENDIX A - Connection diagram &Dimensional details

5. APPENDIX B - Technical specifications

6. APPENDIX C - Display parameters

7. APPENDIX D - MODBUS details and memory map

8. APPENDIX E - Programming through front panel- Detailed programming using front

panel keys

9. APPENDIX F - List of errors

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1. GENERAL

Meter measures active, reactive and apparent energieson 3 phase 4 wire/ 3 wire systems in all four quadrants.

8 Energy accumulators kWh, kVArh lag, kVArh lead &kVAh in forward and reverse directions.

Measures instantaneous parameters - voltages,currents, frequency, rising demand, prediction demand,spare load, phase sequence, power factor and date &time.

Meter configuration/data collection possible throughRS485 port using MODBUS protocol.

Keys on the front panel to scroll through display / toperform manual reset / to configure meter.

Maximum Demand registers with programmable

Block/Sliding methods, integration periods and energytypes.

Meter can be configured as Uni / Bi-directional meter.

Different means of Reset - Manual, Auto monthly, Autodaily & Auto monthly-Manual modes of resets.

kWh & kVArh pulse output LEDs available on frontpanel.

LCD Segments for indicating presence of voltages andcurrents in each phase separately is available.

Built in selfsupervision.

Conforms to standards: IEC61000-4, IEC60255,CISPR14, IS14697, CBIP88, IEC 60687

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2. DESIGN

2.1. THEORY OF OPERATIONThe meter consists of the following sections.

2.1.1. ANALOG SECTIONHigh precision current transformers and voltage transducersstep down input currents and voltages that are fed to an analogto digital converter.

2.1.2. DIGITAL PROCESSING SECTIONA powerful microcontroller controls the analog and digital

sections. The digital samples are processed to obtain variousmetering data that is stored in non volatile memory.High precision clock used for energy computation.A high precision real time clock controls all time keepingactivities.External interface is through display, key board and RS485communication port.

2.1.3. POWER SUPPLY SECTIONA switched mode power supply supplies power to the metersinternal circuitry.

2.2 HARDWAREThe hardware of the meter has been designed to make it lightin weight, rugged, reliable and safe for the users.

2.2.1. CompactThe meter is designed using Surface Mount Technology, whichmakes it light in weight and compact.

2.2.2. EfficientSwitched Mode Power Supply is used for meter operation,which reduces the burden per phase of the meter making it

more efficient. An extended temperature LCD is used fordisplaying various parameters.

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2.2.3. RuggednessAll components used in the meter are of extendedtemperature range, which makes the meter ideal for tropicalclimates.

2.2.4. User interfaces LEDs - LEDs for WH & VArh. PULSE outputs are

available on front panel.

Keys - In closed condition, two keys are provided onthe front panel, for scrolling through the display.With top cover removed, 4 keys and a recessed key

are available for programming the meter.

LCD - The meter uses an extended temperature LCD,with back lighting, which displays various parameters.

RS485 port for communication using MODBUSprotocol.

2.2.5. Data safety Built in self supervision system avoids data

corruption.

EEPROM backup is used to store the meteringdata. This ensures data safety in case of powerfailures. The data will be retained for 10 years in case

of power failures.

RTC with external battery backup is used for timekeeping. It has a calendar of 100years.

Watch dog timer is used to monitor theprocessing activities which ensures the reliableoperation of the meter.

Power down sensor senses power failure and shutsdown the system safely.

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Data security lock is provided for storing meteringdata. This makes the metering data immune tospurious signals on power lines.

The meter is designed to conform to IEC standardsfor EMI/EMC, which makes the system immune toElectromagnetic Interference.

Periodic setup/program data check is carried outand anomaly is indicated on error occurrence.

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2.3. FEATURES

2.3.1. ENERGY ACCUMULATORS

8 energy accumulators record the following energies-

1. Forward Active Energy2. Forward Lagging (Inductive) Reactive Energy3. Forward Leading (Capacitive) Reactive Energy4. Forward Apparent Energy5. Reverse Active Energy6. Reverse Lagging (Inductive) Reactive Energy

7. Reverse Leading (Capacitive) Reactive Energy8. Reverse Apparent Energy

Cumulative energiesAll eight energy types get accumulated from the time ofInstallation. These accumulators cannot be reset by performingany type of reset.

Reset energies (cumulative)The cumulative energies of all eight energies at the time ofreset are stored, for 4 backups.

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2.3.2. MAXIMUM DEMAND (MD) REGISTERS

A max. of three MD registers out of the eight energy types canbe selected and programmed for separate integration periods.

Each MD can be configured separately for Block/Slidingwindow method.

Integration periods of 10,15,30,60 minutes & Subintegrationperiods of 1, 2, 3,5,10,15,30,60 minutes are programmable.

Reset MD Registers

These are the MDs, for the present billing period i.e. from thetime of latest reset. If a reset is performed, these values arepushed to backups and these registers get cleared.

Cumulative MD RegistersWhenever a reset is performed the reset MDs are added to theexisting cumulative MD registers.Cumulative MD feature helps to discourage unauthorised MDreset.

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2.3.2.1. Methods of MD calculation

Normal or Block method: At the end of each fixed intg. periodaverage power for that period is calculated. If this value is

greater than the already existing value then this is stored asthe MD.

Sliding window Method: At the end of a sub intg. period theaverage power is calculated for one intg. period. If this value isgreater than the already existing value then this is stored asthe MD. The intg. Period slides by a window of the sub intg.period.

e.g. MD no. Method Intg. period Sub Intg. periodMD1 Sliding 30 min. 15 min.MD2 Block 30 min. 30 min.

Assume a load pattern of the following type

20kVA 30kVA 30kVA 20kVA

15 mins. 15 mins. 15 mins. 15 mins.09:00 09:15 09:30 09.45 10:00

For MD1 (Sliding window method)-Demand - 09:00 to 09:30 block = (20*15+30*15)/30 = 25kVADemand - 09:15 to 09:45 block = (30*15+30*15)/30 = 30kVADemand - 09:30 to 10:00 block = (30*15+20*15)/30 = 25kVA

MD1 at the end of 10:00 = 30 kVA

For MD2 (Block method)-Demand - 09:00 to 09:30 block= (20*15+30*15)/30= 25kVADemand - 09:30 to 10:00 block= (30*15+20*15)/30= 25kVAMD2 at the end of 10:00 = 25 kVA

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2.3.3. RESET

2.3.3.1. RESET MODESMeter can be configured for one of following modes of

reset-1. Manual ResetThe meter can be reset manually by operating a pushbutton on the front panel.Lockout days i.e. no. of days before which anothermanual reset can be performed, is programmablebetween 0 to 99 days.

2. Auto Monthly Reset:The meter can be reset automatically on a preset dateand at the preset time.The date could be a positive absolute date (1 to 28) i.e.the meter resets on the date set at the preset timeORThe date could be set as a negative no. (0 to 27) i.e.the no. of days from the end of the month.

Eg. If the date is programmed to -2, then reset willoccur automatically on 29th Jan, 26th Feb. (if non leapyear), 29

thMarch, 28

thApril and so on at the preset

time.

3. Auto Monthly and Manual ResetBoth auto monthly and manual reset options are

available together.

4. Auto Daily Reset:The meter can be reset automatically daily at a presettime.

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2.3.3.2. RESET DATA

4 RESET BACKUPS are provided.The following resetparameters are available-

Date and Time stamp of reset -Whenever a reset is performed, the date and time ofthe reset is stored along with the TYPE of reset(poweron-auto / poweroff-auto / poweron-manual /battery-manual) performed.

Reset energies (cumulative at reset) for all backups.

MDs for all backups

Cumulative MD at all backups

Reset count No. of resets performed(rolls over after 99 to 0)

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2.3.4. INSTANTANEOUS PARAMETERS

Voltages and Currents - The instantaneous values ofcurrents and voltages are available phasewise.

Three segments on LCD indicate the presence/absence ofphase voltages and currents.If voltage is absent in a phase, the corresponding phasesegment is OFF. If only voltage is present in that phase then itis ON. If both voltage and current are present in that phasethen it blinks at a fixed rate.

Frequency - The meter calculates the instantaneous

value of the system frequency.

Power Factor (PF) - The meter calculates theinstantaneous PF of the system, phasewise & all phases.

Instantaneous Powers - The meter calculatesinstantaneous true active, reactive & apparent powersirrespective of the configuration of the meter.

Phase Sequence - The meter detects the phasesequence of both voltage and current circuits.

Rising Demand (RD)Rising demand indicates the average power being consumedupto an instant in the integration period, averaged over the

entire integration period.Or RD = Energy consumed in the integration period till the

particular instant the complete integration period.The same settings of MDs i.e. no., type, method andintegration period, is applicable to rising demand registers.

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2.3.5. PROGRAMMABLE FEATURESMeter can be programmed via front panel or RS485 port(password protected)- See appendix D for address list(memory map) for programming using MODBUS protocol.

Front panel Enter programming mode by pressing therecessed button on the front panel. Then using the other 4keys on the front panel, the meter can be programmed.Refer appendix E. Front panel programming is passwordprotected.

RS485 port Using MODBUS protocol.

2.3.5.1. UNI/BI-DIRECTIONAL CONFIGURATIONThe meter can be programmed as a uni-directional or a bi-directional meter.

Uni-directional configurationThe meter records forward energies in forward registers. Thereverse energies are added to the forward registers and arealso recorded separately in reverse registers. i.e.Forward register = Forward energy + Reverse energyReverse register = Reverse energy

Bi-directional configurationThe meter records forward energies in forward registers andreverse energies in reverse registers separately. i.e.

Forward register = Forward energyReverse register = Reverse energy

NOTE: The convention followed for forward / reverse is-Forward direction - when current flows from M to L of thecurrent terminals.Reverse direction - when current flows from L to M of thecurrent terminals.

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2.3.5.2. VAh (MD & average PF) CALCULATION METHODSThe meter can be configured for

Leading PF to be treated as UPF

Whenever the PF is leading, apparent energy is same asactive energy, lead reactive energy is ignored.

Leading PF to be treated as LeadEven if the PF is leading, lead reactive energy isconsidered along with active energy for apparent energycalculation.

2.3.5.3. EXTERNAL CT/PT RATIOSThe meter can be programmed for external CT/PT ratios.Primary & secondary turns can be programmedindependently between 1 to 9999. (max. CTxPT

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2.3.5.8. DISPLAY DETAILS

LCDThe various parameters calculated by the meter aredisplayed on LCD.

Display parameters selectable - Can select any out ofmany parameters.

Sequence - The sequence of display parameters isselectable.

Scroll rate - The scroll rate of the display parameters isprogrammable from 3 to 60 secs. in steps of 3 secs.

Display modes - 3 display modes are available.Mode 1:- Display parameters selectable upto 55 nos. in any

sequence required.- Auto and manual scroll facility available.Mode 2:- All display parameters selected.

(Parameters are fixed and are not programmable infield)

- Manual scroll facility onlyMode 3:- Display parameters fixed- High resolution cumulative

forward & reverse Wh/VArh.- Manual scroll facility only

Mode SwitchingSwitching between modes is possibleby simultaneously pressing the UP and DOWN keys.If no key is pressed for 5mins. then meter automaticallyswitches back to MODE 1 auto display.

Manual scrolling Manual scrolling within a display modeis possible by using UP or DOWN keys.

Refer Appendix C for more details of display parameters.

2.3.5.9. UNIT CODE SETTING (AT FACTORY ONLY)Each meter is given a unique no. at the factory.

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2.3.6 COMMUNICATIONThe communication interface is RS485 (half duplex) port.Selectable baud- 300, 600, 1200, 2400, 4800 or 9600 bpsSelectable parity- none, even or odd

Data collection and programming of the meter is possiblethrough this interface using MODBUS protocolRTU mode (8 bit data, 1 start bit, 1 stop bit)

2.3.6.1. DATA COLLECTIONSpecific data can be collected using the modbus protocol. Thedifferent types of data available are

- Total cumulative energies

- Cumulative reset energy backups- MD since reset- Reset MD backups- Reset dates & times- Cumulative MD at resets- Reset count- Instantaneous values- Communication count - i.e. no. of times meter

programmed via front panel- Anomaly string

See appendix D for the complete address list of dataaccessible via RS485 port.

2.3.6.2. PROGRAMMINGSee appendix D for the complete address list of parametersthat can be programmed using MODBUS protocol.See appendix E to program meter via front panel (passwordprotected).

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2.3.7 ACCURACY TESTSAccuracy class 1.0 conforms to standards IEC1036/13779.

class 0.5S conforms to standardsIEC 60687/CBIP-88/IS 14697

The meter supports different means for testing accuracy.

2.3.7.1 Pulse counting methodkWh & kVArh pulse output LEDs are provided on the frontpanel.Pulses/kWh (or kVArh) Voltage/Current

2,500 / (external CT*PT) 3ph 4W 415V (L-L) / 5A

12,500 / (external CT*PT) 3ph 4W 415V (L-L) / 1A10,000 / (external CT*PT) 3ph 4W/3W 110V (L-L) / 5A50,000 / (external CT*PT) 3ph 4W/3W 110V (L-L) / 1A

2.3.7.2 High resolution displayA high resolution display of 8 energies is available. The displayformat is xx.xxxxxx

This value is dependent on the meter configuration- uni/bidirectional and method of VAh calculation set in the meter.

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3. INSTALLATION

3.1 Incoming InspectionBefore the meter is installed, visual inspection, for any damage

in the process of transportation, has to be carried out. Ifdamages are found, refer to warranty sheet and take properaction.

3.2 Re-packingIf the meter has to be returned to the supplier, repack the unitin the packing in which it was supplied.

3.3 Optimum Field ConditionsFor the reliability and better life of the product the unit has tobe operated at moderate temperatures and humidity. Themeter is designed to work from -5 to 60 deg C and humidity of95% RH non condensing.

3.4 StorageIn case if the meter is not installed after receiving, it has to be

stored in a dry place in the original packing material.

3.5 MountingMeter is flush mounting type.

3.6 Extra precautionsMake sure of supply voltage, supply current and configuration.

Wrong connection can severely damage the instrument, whichis not covered under our warranty.

3.7 ConnectionThe WIRING connections are to be done as shown inAppendix A.

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WARRANTY

Larsen & Toubro Limited warrants that all the L&T products willmeet L&T's published product specifications, and will be free ofdefects in workmanship and materials for a period of 12 monthsfrom the date of invoice from L&T.

L&T's obligation under this warranty shall be limited to servicing orreplacing defective parts subject to the following terms andconditions provided the notice of defects and satisfactory proofthereof is given to L&T by its distributor or its customer withinthe Warranty period.

1. L&Ts shall provide repairs and maintenance service for allequipment sold/or distributed by L&T, and products which cannotbe repaired by L&T will be returned, subject to L&T's prior consentfor free repairs .

2. Defective parts shall be serviced or replaced by L&T on oneway freight paid basis.

This warranty does not cover any defect in the product caused byaccident, misuse, neglect, alteration modification or substitution ofany of the components or parts, or any attempt at internaladjustment by unauthorized service personnel .

Under no circumstance shall L&T be liable for any consequentialor resulting injury or for loss, damage of expense directly orindirectly from the use of this product .

The foregoing warranty is in lieu of all other warranties, expressedor implied, and is the sole and exclusive remedy for any claimarising from any defect in L&T products.

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DisclaimerSufficient care is taken to provide all information regarding theproduct but L & T does not claim any responsibility for thedamages caused by using the product directly or indirectly.

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APPENDIX A Connection diagram

WIRING DIAGRAM - 3Phase 4Wire

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WIRING DIAGRAM 3Phase 3Wire

DIMENSIONAL DETAILS

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APPENDIX B Technical specifications

Accuracy Class 1.0 IEC 1036/IS 13779Class 0.5S - IEC 60687/CBIP-88/

IS14697

Voltage(Vn) 3Ph 4W- 415V AC (-40% to +20%)110V AC (-40% to +20%)

3Ph 3W- 110V AC (-40% to +20%)

Current (In) 5A or 1A (to 200%)Starting current 0.2% In (Class 1.0)

0.1% In (Class 0.5S)

Power Factor 4 quadrant operation

Frequency 50 Hz +10%

Load characteristics

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APPENDIX C - DISPLAY PARAMETERSNOTE:THE ACTUAL DISPLAY ON LCD IS AS INDICATED IN QUOTES""Instantaneous Values

1-3) R,Y,B Phase Voltage " xxx.x ""Up V"

(p=1,2,3 phase)4-6) R,Y,B Phase Current " x.xxx "

"Ap A"(p=1,2,3 phase)

7) Frequency " xx.xx Hz "

8) Phase Sequence " ryb ryb ""SE "

9) Inst. Active Power " x.xxxx "(Pr indicates present "Pr kW "or instantaneous data)

10) Inst. ReactivePower " x.xxxx kVAr""Pr "

11) Inst. Apparent Power " x.xxxx kVA ""Pr "

12) Instantaneous PF " PF x.xxx ""Pr "

13) RTC " DD.MN|HH:MM "(YY=year, MN=month, "YY "DD=date,MM=minute, HH=Hour)

14-16)Rising MD "RD "(MM=minutes,SS=seconds " m SS x.xxxx "m=1,2,3 => MD1,MD2,MD3 ) "MM kW"

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High Precision Energies

17) Cumulative Forward kWh " ->+ "(->+ indicates Forward; " xx.xxxxxx "

"C_ kWh "

18) Cum. Forward kVArh lag " ->+ lag "" xx.xxxxxx kVArh""C_ "

19) Cum. Forward kVArh lead " ->+ lead "" xx.xxxxxx kVArh""C_ "

20) Cum. Forward kVAh " ->+ "" xx.xxxxxx kVAh""C_ "

21) Cumulative Reverse kWh " -+ "

" xxxxxx.xx ""C kWh"

26) Cum. Forward kVArh lag " ->+ lag "" xxxxxx.xx kVArh""C "

27) Cum. Forward kVArh lead " ->+ lead "" xxxxxx.xx kVArh""C "

28) Cum. Forward kVAh " ->+ "" xxxxxx.xx kVAh""C "

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29) Cum. Reverse kWh " -

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Previous reset Average PF (Billing period)

59)Previous reset Avg.PF " PF x.xxx ""b "

Reset counts

60) Reset Count " xxx ""rC "

61) Total Power On Time " dddd:hh "(dddd=days; hh=hours) "tP "

62) Communication Count " Count xx ""Pr "

63) CT Ratio " x.xxx ""Ct "

64) PT Ratio " x.xxx ""Pt "

65) Multiplication Factor " xxxxx.xxx ""LF "

66) Anomaly String "A ESt "(A = indicates anamoly string;E = anomaly indicating Flash checksum errorS = anomaly indicating NVRAM setup Checksum errort = anomaly indicating invalid RTC time

67) Version " XXXX.XX "

"PC "(XXXX.XX =Flash version; PC = Lucid version )

68) Display check"-+ RD MD 123 * LOBAT Lead Lag x103""T8 8.8.8.8:8.8:8.8 kVArh ""88 kWh "

Note : 123- indicates the presence of voltages in phases R,Yand B .The respective displays blink to indicate the presence ofcurrents also.

LOBAT- indicates RTC battery low conditionx103 - indicatesMega Units when it appears along with k.

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APPENDIX D MODBUS DETAILS & MEMORY MAP

MODBUS DETAILS

1. DETAILS OF COMMUNICATION INTERFACERS485 interface is available to communicate with the meter.The interface is available at the terminals as well as on a 9 pinD connector.

1.1) Interface Standard:The configuration details to communicate with the meter aregiven below-

Standard RS485 (half duplex)Baud rate Selectable- 9600,4800, 2400,1200,600 or

300 bpsParity Selectable- None, odd or evenStart bit 1Stop bit 1

1.2) Protocol:

The RS485 interface uses MODBUS Protocol inRTU mode.Communicating with the meter involves sending commands tothe meter for reading and writing the particular register. Themeter can be addressed with specific user defined meteraddress (slave ID) from 1-255.

2. DETAILS OF MODBUS PROTOCOL

In the explanation of protocol the examples used are specific toL&T meters. The details of the protocol are also limited to L&Tmeters.

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2.1) Remote Terminal unit Framing:In RTU mode data is sent as 8-bit binary characters. In RTUmode, message characters must be transmitted in acontinuous mode. The receiving device monitors the elapsed

time between receipt of characters i.e. inter byte delay. If interbyte delay is three and one half the character time (for e.g.at 9600bps, the max. inter byte delay expected will be1ms*3.5), the receiving device can timeout.If the time between characters of the frame (command)received by the meter is greater than 40ms., the meter timesout and flushes the frame and assumes that the next bytereceived will be an address.

The max. response time of the meter to a command, i.e. thetime taken to send the first byte out in response to the

command is max. 240ms.

ADDRESS FUNCTION DATA CHECK

8 BITS 8 BITS N * 8 BITS 16 BITS

2.2) Address field:The meter can be addressed with specific user defined addressfrom 1-255. Each slave must be assigned a unique addressand only the addressed slave responds to query that containsits address. When the slave sends a response the slaveaddress informs the master which slave is communicating.In broadcast message, an address of 0(zero) is used. Allslaves interpret this as an instruction to read and take action onthe message, but do not issue a response message.

2.3) Function field:The function code field tells the addressed slave what functionis to be performed.The higher order bit in this field is set by the slave device to

indicate that other than a normal response is being transmittedto the master device (See SECTION 3 for exception response).The following functions have been implemented in the meter.

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CODE MEANING ACTION

03 Read holding registers Obtains current binary value

in one or more

holding registers.

06 Preset single register Place a specific binary valueinto a holding register.

16 Preset multiple registers Places specific binary values

into a series of consecutive

holding registers.

2.4) Data Field:

The data field contains the information needed by the slave toperform the specific function or it contains data collected by theslave in response to a query.

2.5) Error Check Field:This allows the master and slave device to check a messagefor error transmission.The error check field uses a CRC-16 check in the RTU mode.

3. EXCEPTION RESPONSES

Exception response is a notification of an error. The exceptionresponse codes are listed in the table 3-1.When a slavedetects one of these errors, it sends a response to the masterconsisting of slave address, function code, error code and errorcheck field.To indicate that the response is a notification of an error, thehigh order bit of the function code is set to 1.

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Table 3-1

CODE NAME MEANING

01 ILLEGAL FUNCTION The message function

received is not anallowable action for

slave.

02 ILLEGAL DATA

ADDRESS

The address referenced

in the data field is not an

allowable address for the

addressed slave location.

03 ILLEGAL DATA

VALUE

The value referenced in

the data field is not

allowable in the

addressed slave location.

Example:Query Message

SLAVE

ADDR

FUNC H.O

START

ADDR

L.O.

START

ADDR

H.O

NO. OF

REG

L.O NO.

OF REG

ERROR

CHECK

FIELD

ERROR

CHECK

FIELD

0A 01 00 24 00 02 FC BB

The query requests the status of input 0036 in slave no.10.Since the function is an invalid function for the L&T meters sothe following error response will be generated.

Response MessageSLAVEADDR

FUNC EXCEPTIO

N CODE

ERROR

CHECK

ERROR

CHECK

0A 81 01 F0 52

The function code field is the original function code with thehigh order bit set and exception code 01 indicates an illegalfunction field.

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4. EXPLANATION OF VARIOUS FUNCTION

The purpose of this section is to define the general format for thespecific command available to programmers. The form of eachquery message (in RTU transmission mode) and an explanation of

the function the query message performs are provided.All numbers in Modbus format are entered in hexadecimal.

4.1) Read Output Register (Function Code 03) QueryRead output Register(03) allows the user to obtain the binarycontents of holding register in the addressed slave.The addressing allows up to Max.90 registers to be obtained ateach request.

Broadcast mode is not allowed.The below example reads registers of R phase voltage from slavenumber 17(decimal). Since R phase voltage is stored in theaddress 0000 and 0001 so to read R phase voltage both addressesshould be read simultaneously.

Example:Query Message

SLAVE

ADDR

FUNC H.O

START

ADDR

L.O.

START

ADDR

H.O NO.

OF REG

L.O NO.

OF REG

ERROR

CHECK

FIELD

ERROR

CHECK

FIELD

11 03 00 00 00 02 C6 9B

NOTE: If a particular parameter is stored in more than one addresslocation. Then for reading that particular parameter all the addresslocations should be read simultaneously. Otherwise meter will not

respond or the response will not be the correct value.For further details see memory map of parameters.

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Response:The addressed slave will respond with its address and the functioncode, followed by the information field. The information fieldcontains 1 byte describing the quantity of data bytes to be returned.

The contents of register requested (DATA) are two bytes each. Thefirst byte includes the higher order bits and the second byteincludes lower order bits.

Response MessageSLAVE

ADDR

FUNC BYTE

COUNT

DATA

O/P

REG

H.O.

0000

DATA

O/P

REG

L.O.

0000

DATA

O/P

REG

H.O.

0001

DATA

O/P

REG

L.O.

0001

ERROR

CHECK

FIELD

ERROR

CHECK

FIELD

11 03 04 00 00 5D E6 52 E8

In this particular example the data obtained for R phase voltage is0x00005DE6 which if converted into integer will be 24038.So to getthe voltage of R-phase this particular value should be multipliedwith the specified multiplication factor(MF) which is 0.01 in thiscase. (For further details see the memory map of the parameters).

So 24038 x 0.01=240.38 which is R-phase voltage.

4.2) Preset Single Register(Function Code 06)

CAUTION:Function (06) will overwrite controller memory.

Function (06) allows the user to modify the contents of a holdingregister. The contents of only those holding registers can bemodified which are writeable only. The values are provided inbinary, up to the maximum capacity of the controller (16-Bits in L&Tmeters)and unused higher bits must be set to zero.When used with slave address zero(Broadcast mode), all slavecontrollers will load the specified registers with the contentspecified.

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Example:This example will set the CT primary value in slave number 17.Theaddress of CT primary is 2048 and value to be programmed is1000.

Query MessageSLAVE

ADDR

FUNC H.O

START

ADDR

L.O.

START

ADDR

DATA

VALUE

H.O

DATA

VALUE

L.O

ERROR

CHECK

FIELD

ERROR

CHECK

FIELD

11 06 08 00 03 E8 89 84

The normal response to a preset single register request is totransmit the query message after the register has been altered.


ADDR

FUNC H.O

START

ADDR

L.O.

START

ADDR

DATA

VALUE

H.O

DATA

VALUE

L.O

ERROR

CHECK

FIELD

ERROR

CHECK

FIELD

11 06 08 00 03 E8 89 84

If the value is an illegal value then the response message will be an

exception response(Error message). For the details of max. andmin. values of any parameter refer to manual.

NOTE: For programming RTC the values the data for setting theRTC should be BCD(Binary Coded Decimal).

Example:For setting date 29 and day 5 at location 257 the query message

will be as follows

Query MessageSLAVE

ADDR

FUNC H.O

START

ADDR

L.O.

START

ADDR

DATA

VALUE

H.O

DATA

VALUE

L.O

ERROR

CHECK

FIELD

ERROR

CHECK

FIELD

11 06 01 01 29 05 04 F5

4.3) Preset Multiple Registers(Function Code 16)

CAUTION:Function(16) will overwrite controller memory.

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Function(16) allows the user to modify the contents of holdingregisters.The contents of only those holding registers can be modified whichare writeable only. The values are provided in binary up to the

maximum capacity of the controller (16-Bits in L&T meters), unusedhigher bits must be set to zero.Maximum of 10 registers can be programmed by this function.When used with slave address zero(Broadcast mode) all slavecontrollers will load the specified registers with the contentsspecified.

Example:

This example will set the CT primary and CT secondary value inslave number 17.The address of CT primary is 2048,CT secondaryis 2049 and value to be programmed for CT primary and secondaryare 1000 and 100 respectively.

Query MessageAD

DR

FU

NC

H.O.

AD

DR

L.O.

AD

DR

QT

Y.

H.O

QT

Y.

L.O

BYT

E

SENT

H.O

DA

TA

L.O

DA

TA

H.O

DA

TA

L.O

DA

TA

ER

R

FIELD

ER

R

FIELD

11 10 08 00 00 02 04 03 E8 00 64 41 34

The normal response to a preset multiple register request is toecho the address function code, starting address and number ofregisters to be loaded.


ADDR

FUNC H.O

START

ADDR

L.O.

START

ADDR

QUANTI

TY H.O

QUANTI

TY L.O

ERROR

CHECK

FIELD

ERROR

CHECK

FIELD

11 10 08 00 00 02 41 38

MEMORY MAP (Address list)

Address Parameters Words MF

(if no specific format is mentioned, format is HEX)

READ ONLY PARAMETERS

Instantaneous Parameters

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0 R Phase Voltage (4W), RY Voltage(3W) 2 0.01

2 Y Phase Voltage (4W), BY Voltage(3W) 2 0.01

4 B Phase Voltage (4W) 2 0.01

6 R Phase Current (4W), R Current(3W) 2 0.001

8 Y Phase Current (4W), B Current(3W) 2 0.001

10 B Phase Current (4W) 2 0.001

12 Active Power R Phase (4W), RY Active Power(3W) 2 0.0001

14 Active Power Y Phase (4W), BY Active Power(3W) 2 0.0001

16 Active Power B Phase (4W) 2 0.0001

18 Reactive Power R Phase (4W), RY Reactive Power(3W) 2 0.0001

20 Reactive Power Y Phase (4W), BY Reactive Power(3W) 2 0.0001

22 Reactive Power B Phase (4W) 2 0.0001

24 Apparent Power R Phase (4W), RY Apparent Power(3W) 2 0.0001

26 Apparent Power Y Phase (4W), BY Apparent Power(3W) 2 0.0001

28 Apparent Power B Phase (4W) 2 0.0001

30 Power Factor R Phase (4W), Power Factor R Phase(3W) 2 0.001

32 Power Factor Y Phase (4W), Power Factor B Phase(3W) 2 0.001

34 Power Factor B Phase (4W) 2 0.001

36 Total Active Power 2 0.0001

38 Total Reactive Power 2 0.000140 Total Apparent Power 2 0.0001

42 Total Power Factor 2 0.001

Format:for above addresses 6 to 421

stword (MSW) 0x0000 if value positive

0XfffF if value negative2

ndword value itself, if positive as indicated by 1

stword

2s complement of value, if negative as indicated by 1st

word

* For addresses 30,32,34 & 42, if the value is 2A (Indicating invalid PF), convert it

to ASCII character. For other values, convert it to decimal.

44 Line Frequency 2 0.01

46 Phase Sequence 2

Format- 1st word-(MSW) Voltage seq., 2nd word-Current seq.123(0x007B) if RYB, 132(0x0084) if RBY

Cumulative energies since installation

512 Cumulative energy - forward kVAh 2 0.01

514 Cumulative energy - forward kWh 2 0.01516 Cumulative energy - forward kVArh lag 2 0.01

518 Cumulative energy - forward kVArh lead 2 0.01

520 Cumulative energy - reverse kVAh 2 0.01

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522 Cumulative energy - reverse kWh 2 0.01

524 Cumulative energy - reverse kVArh lag 2 0.01

526 Cumulative energy - reverse kVArh lead 2 0.01

Cumulative energies at reset (Backup energies )

528 Backup 1 Cumulative energy - forward kVAh 2 0.01

530 Backup 1 Cumulative energy - forward kWh 2 0.01

532 Backup 1 Cumulative energy - forward kVArh lag 2 0.01

534 Backup 1 Cumulative energy - forward kVArh lead 2 0.01

536 Backup 1 Cumulative energy - reverse kVAh 2 0.01

538 Backup 1 Cumulative energy - reverse kWh 2 0.01

540 Backup 1 Cumulative energy - reverse kVArh lag 2 0.01

542 Backup 1 Cumulative energy - reverse kVArh lead 2 0.01







556 Backup 2 Cumulative energy - reverse kVArh lag 2 0.01558 Backup 2 Cumulative energy - reverse kVArh lead 2 0.01










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Maximum demand

1280 Reset MD1 2 0.01

1282 Reset MD2 2 0.01

1284 Reset MD3 2 0.01

1286 Backup 1 MD1 2 0.01

1288 Backup 1 MD2 2 0.01

1290 Backup 1 MD3 2 0.01

1292 Backup 2 MD1 2 0.01

1294 Backup 2 MD2 2 0.01

1296 Backup 2 MD3 2 0.01

1298 Backup 3 MD1 2 0.01

1300 Backup 3 MD2 2 0.01

1302 Backup 3 MD3 2 0.01

1304 Backup 4 MD1 2 0.01

1306 Backup 4 MD2 2 0.01

1308 Backup 4 MD3 2 0.01

Reset backups date, time & type

1536 Backup 1 reset date, time & type 4 1




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Format:YMDHMSTJ (BCD)Y=year, M=month , D=date, H=hour, M=minute, S=second,T=type of reset, J=00 (not used)Type of reset: A for power ON auto reset, M for power ON manual reset, P for power fail autoreset, B for battery manual reset.

Cumulative MD

1792 Reset Cumulative MD1 2 0.01



Rising demand

1872 RD1, elapsed time 3 0.01



Format: xxxxSSMMRDs xxxx (HEX) Elapsed time - SS(BCD) MM(HEX))

1920 Anomaly string (Format: MSB 'A', all other bytes must be 0xFF)Faults are indicated by digits `AENRXD >`Eflash code corruption, N-EEPROM setup corruption, R-RTCcorruption, XD-exception illegal opcode.

8 1

1928 Reset count (Format: 00 to 99(0x0063)) 1 1

1929 Com.count- no. of times meter programmed via front panelFormat: 00 to 99(0x0063)

1 1

1930 CT Tapping - (0x0001 1A tapping, 0x0005 5A tapping) 1 1

1931 Reserved

READ AND WRITE PARAMETERS

Real time clock (RTC)

256 Current Time : Year,Month (Format:YYMM (BCD)) 1 1

257 Current Time : Date,Day (Format:DTDY (BCD)) 1 1

258 Current Time : Hour,Minute (Format:HHMM (BCD)) 1 1

259 Current Time : Second (Format:SS00 (BCD)) 1 1

CT PT ratio settings (1 to 9999 max)

2048 CT Primary 1 1

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2049 CT Secondary 1 1

2050 PT Primary 1 1

2051 PT Secondary 1 1

(max. CTpri/Ctsec)*(PTpri/Ptsec) + , Days : +1 to + 28 Days

1 -> - , Days: 0 to27 DaysLockout Days : 0 to 99 days.Format for 2

ndword:

15 14 13 12 11 10 9 8 | 7 6 5 4 3 2 1 0Hour | Min.

Hour : 23 max.Min. : 59 max.

MD Settings

2160 Setting for MD1 2



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Format of MD Setting :1

stWord :

15 14 13 12 11 10 9 8 | 7 6 5 4 3 2 1 0No. of MD | MD Type

2nd

Word :16 15 14 13 12 11 10 9 | 8 7 6 5 4 3 2 1

Intg. Period | Sub.Intg. PeriodNo. of MD's: 1 to 3MD Type : 0 to 7Forward 0-kVA, 1-kW, 2- kVAr lag, 3-kVAr leadReverse 4 -kVA, 5-kW, 6- kVAr lag, 7-kVAr leadIntg. Period : 10,15,30,60 min.Sub.Intg. Period : 1,2,3,5,10,15,30,60 min.

2304 Method of energy calculation (Lead=Lead / Lead=UPF) 1

Format: 0x0000 - lead treated as lead

0x0001 lead treated as upf2305 Meter direction ( Uni-directional / Bi-directional) 1

Format: 0x0000 -> Uni-directional0x0001 -> Bi-directional

Note:Unit for energies & MDs (not instantaneous parameters) are dependent on CT PTratios.

If[(CT primary/CT secondary) * (PT primary/PT secondary)] > 1000 then unit is M(Mega) else it is k (kilo).

Every time any settings of the meter are modified, the data logging or scanningsoftware must1. give a hint that settings have been changed and hence whether data base

has to be backed up2. collect new settings from meter3. use Com. Count, that increments every time meter is programmed via front

panel, to see if meter has been programmed from front panel.

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APPENDIX EProgramming through front panel

1> Press the recessed key on front panel.

Meter displays ProG indicating programming mode andthen prompts to enter the password.

2> Enter the password (only numeric) using & keys. Press key.If entered password is correct, then PASS ACP i.e

accepted message, appears on the display.

3> 01GEnErAL display appears.

4> To change settings

To enterdifferent levels within the programming menupress key.To get back to previous menu, press key.

To scroll through different menus in the same level

press key. After reaching the last sub level for a particular setting

(meter displays the present setting of the meter),pressing prompts (blinks at cursor) to edit .

To edit the settings at the blinking cursor position, use

key (to move cursor) and key (to change thevalue at the blinking cursor).

Press to change the editted setting.Meterdisplays UPdAtE.

Press so that meter updates to the newsetting. Meter displays ACCEPtEd.

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Detailed programming using front panel keys

Use key to move through columns of table below

Use key to move through rows of table belowLevel1 Level2 level3 level4 level5 Description

01GenErAL 11SL Id_000 edit Unique Slave ID 0 to 255

12SEt CtPt CtPr:0001 edit CT primary 0 to 9999

CtSE:0001 edit CT secondary 0 to 9999

PtPr:0001 edit PT primary 0 to 9999

PtSE:0001 edit PT secondary 0 to 9999

13SEt ConF LEAd:UPF edit Meter config: lead as lead/UPF

UnI dIr edit Uni or Bi directional meter

14SEt PASS PASS:0000 edit Numeric password

15SEt bdPr bAUd: 9600 edit Baud rate (300 to 9600)

Prt:nOnE edit Parity (none, odd,even)

02rES InFo 21 tYPE: 0 edit Reset Info.: Type 0=manual,

1=Auto monthly, 2=Auto daily,

3=Automonthly & manual

22 LoC:00 edit Lockout days 0 to 99

23 dAYS 01 edit Reset date. (In edit mode plussign appears as underscore

i.e. _ & minus sign as -.)24 t 00:00 edit Reset time

03dnd InFo 31no: 3 edit MD info: No. of MDs -1 to 3

32SEtt InG SEt no_ 1 1 IntG :30 edit MD1 setting: Integration period

1S IntG:30 edit sub integration Period

1 tYPE :0 edit MD1 energy: 0=For.kVA,

1=For.kW, 2=For.kVAr lag

3=For. kVAr lead, 4=Rev.kVA

5=Rev.kW, 6=Rev.kVAr lag,

7=Rev.kVAr lead,

SEt no_ 2 2 IntG :30 edit MD2 setting

2S IntG:30 edit

2 tYPE :1 edit

SEt no_ 3 3 IntG :30 edit MD3 setting

3S IntG:30 edit3 tYPE :2 edit

04dISPLAY 41SCr t:03 edit Display: Scroll period 3-60sec

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42 dISP SEt 1 edit Select display no. (annex.C)

2 edit deletes the displayitem.

. edit inserts a display item.Type value. Press enter.

To update, use key

. edit

27 until display shows 'ESC'.Then

28 ESC press . To accept,

press once again.

05SEt rtC Dtdd:mm:yy

edit Set RTC: date as dd:mm:yy

T dayhh:mm:ss

edit time as day hh:mm:ss

(day as 1 to 7 for Sun to Sat)

APPENDIX F - ERROR list

Error codes displayed on LCD while programming fromfront panel1. PASS Err - if the entered password for accessing

programming mode is wrong.2. dAtA Err - if data entered is out of range.3. LC Err - if reset time is not a multiple of all the

selected MDs4. SintGErr - if sub integration period is > integ. period

Or is not a multiple of intg. period.5. Lt Err - if no. of display parameters selected >556. dEL Err - if trying to delete ESC or trying to

delete when only one display parameter isselected.7. dISP Err - if the display parameter no. >688. dISP Out - if no. of display parameters selected is

zero.

Error codes in communication1. 01 - Illegal function code

2. 02 - Illegal data address3. 03 - Illegal data value

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Manufactured by

LARSEN & TOUBRO LIMITED,KIADB INDUSTRIAL AREA,HEBBAL, HOOTAGALLY,MYSORE 570 018.INDIA.

Visit us @www.lntmps.com

www.lntebg.comwww.larsentoubro.comReach us @[email protected]
http://www.lntmps.com/http://www.lntmps.com/http://www.lntmps.com/http://www.lntebg.com/http://www.lntebg.com/http://www.larsentoubro.com/http://www.larsentoubro.com/mailto:[email protected]:[email protected]:[email protected]:[email protected]://www.larsentoubro.com/http://www.lntebg.com/http://www.lntmps.com/

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