ELNet LT Installation & Operation Manual

Installation & Operation Manual

ELNet LT

Electrical Measurements & Power Quality

Rev. 1.9

2

Table of Contents

CHAPTER 1 ─ INTRODUCTION .......................................5

1.1 — About the ELNet LT Energy Powermeter ........ 5

1.2 — How to use this manual ......................................... 6

1.3 — Safety Information ................................................ 7

1.4 — Warranty ................................................................ 8

1.5 — Your comments are welcome ...............................10

1.6 — Disclaimer ............................................................. 11

CHAPTER 2 — INSTALLATION ...................................... 12

2.1 — Contents of packaging .........................................12

2.2 — Mechanical mounting ..........................................14

2.3 — Wiring Schematics ...............................................16

2.4 — Rear Panel Connections .......................................25

2.5 — Digital Outputs and Inputs. .................................30

2.6 — Manufacturing Data. ...........................................31

CHAPTER 3 — USING ELNet LT POWERMETER .... 32

3.1 — Front Panel ...........................................................32

3.2 — Control Buttons ....................................................33

3.3 — Lock Utility ...........................................................34

CHAPTER 4 — NECESSARY ELNet LT SETTINGS ... 35

4.1 — Settings for Current/Voltage Transformer .........37

4.2 — Electrical Connection Check ...............................38

4.3 — Change language ..................................................42

4.4 — Time Settings ........................................................42

4.5 — Date Settings .........................................................43

4.6 — Setting energy pulse out .......................................44

4.7 — Delta/star Electrical network definition .............45

3

CHAPTER 5 — FRONT PANEL DISPLAYS ..............47

5.1 — Current Voltage & Frequency .............................47

5.2 — Reset I , V , F Peak values ..................................49

5.3 — Power Display .......................................................51

5.3.1 — Real time power display ................................ 51

5.3.2 —Reset power peak values ................................. 53

5.3.3 — Power Demand ............................................... 53

5.4 — Power Quality .......................................................54

5.4.1 — Wave Form Display ........................................ 55

5.4.2 — Harmonics Analyzer & THD ......................... 56

5.4.3 — Alarm Setup .................................................... 57

5.5 — Energy Metering ..................................................58

5.5.1 — Main Energy Meter........................................ 59

5.5.2 — 2nd. Energy meter .......................................... 60

5.5.3 — T.O.U Energy .................................................. 61

5.5.4 — Periodic Energy meter ................................... 62

CHAPTER 6 — COMMUNICATION ....................... 63

6.1 — MODBUS Framing ..............................................63

6.1.1— RTU Transmission Mode ................................ 63

6.1.2 — The RTU Frame Format ................................ 64

6.1.3 — Address Field .................................................. 65

6.1.4 — Function Field ................................................ 65

6.1.5 — Data Field ....................................................... 66

6.1.6 — Check Field ..................................................... 66

4

6.2 — Registers for ELNet LT Powermeter ............... 67

6.2.1 — Registers addresess ....................................... 68

6.3 — Communication Connections ..............................69

6.4 — Communication Settings ......................................69

6.4.1 — Communication Address ............................... 70

6.4.2 — Baud Rate ....................................................... 70

6.4.3 — Parity............................................................... 70

6.5 — Communication Set Up ........................................71

6.5.1 — Set up Serial Communications .........................71

6.5.2 — Set up Ethernet Communications ....................72

6.6 — Communication with UniArt Software ..............73

CHAPTER 7 — Specifications ........................................... 75

7.1 — Measurement & Display ......................................76

Index .................................................................................... 78

Appendix A — Installation & Configuration Check List ... 78

5

CHAPTER 1 ─

INTRODUCTION

1.1 — About the ELNet LT Energy Powermeter

Large consumers of electricity e.g. factories, hotels, hospitals,
municipalities, need to know the history of their consumption
and the quality and the values of the power supply. Details such
as Voltage, Current, Power Factor, Hertz, Neutral Current,

Energy consumption can be displayed by the

ELNet LT

Energy & Powermeter.

An additional feature of the Powermeter is the ability to
measure Harmonics. Part of the Electricity Supply Authority’s
bill reflects poor or good Harmonics in the consumer’s system,
therefore it is in his interest to monitor Harmonics and try to
improve it.

The

ELNet LT

Energy & Powermeter is a compact,

multi functional, three-phase Powermeter simple to install and is
especially designed to integrate into Building Management
Systems. It requires no special mounting and is ideally suited
for mounting on the front face of any standard electrical panel.

The Configuration and Setup is menu driven, with password
protection.

Communication with external devices is simple and is based on
standard known protocol.

Each

ELNet LT

Energy & Powermeter is carefully and

meticulously manufactured using quality components and the
latest production methods. Before leaving the factory each

ELNet LT

Energy & Powermeter is calibrated and is

sent to the customer accompanied by the test certificate and
Certificate of Compliance (C.O.C).

6

1.2 — How to use this manual

We at CONTROL APPLICATIONS Ltd, envisage this manual
to be used by three types of people, i.e. the Installation
Technician, the Senior Electrical Engineer and the end User.
For this reason this manual is divided into chapters for ease of
reference by each of these different people. There could be a
situation where two of the above mentioned tasks can be
combined, or in a rare instance one person could handle all three
tasks.

CHAPTER 1, Introduction, describes the

ELNet LT

Energy & Powermeter, its potential users, the readings it can

provide and some of its features in brief.

CHAPTER 2, Installation, provides detailed instructions for
unpacking, mechanical mounting, and electrical wiring up
instructions for the Installation Technician.

CHAPTER 3, Using the

ELNet LT

Energy &

Powermeter, describes in detail front Panel, the functions of

the control buttons, and the Lock Utility.

CHAPTER 4, Parameter Configuration & Settings explains in
detail the minimum parameters settings needed by the Senior

Electrical Engineer to set up and configure the

ELNet LT

Energy & Powermeter.

CHAPTER 5, Front Panel Displays, is an easy to follow step­by-step guide to obtain readings, graphs and tables.

7

CHAPTER 6, Communications provides details about the
Communication capabilities of the ELNet LT

Energy &

Powermeter

, and how to Set Up.

CHAPTER 7, Specifications, is a detailed list of specifications
of the ELNet LT

Energy & Powermeter

.

APPENDIX A, Installation & Configuration Check List,
provides a Check List to insure no important steps will be
missed during the initial set up.

1.3 — Safety Information

The purpose of this manual is to help you. Please read the
instructions carefully before performing any installation and
note any precautions.

• Ensure that all incoming AC power and

other power sources are turned off before
performing any work on the

ELNet LT

Energy & Power Powermeter. Failure

to do so may result in serious or even fatal
injury and/or equipment damage.

• If the

ELNet LT

Energy &

Powermeter is damaged in any way do

NOT

connect it to any power source.

WARNING!

8

• To prevent a potential fire or shock hazard,

never expose the

ELNet LT

Energy &

Powermeter to rain or moisture.

• Keep the surrounding area free of dirt and

clutter especially metal objects. Good
housekeeping pays.

• Inspect the cables periodically for cracks,

kinks or any other signs of wear.

• Keep children away.

• Do not pull the cords.

• Users should stay alert and not approach the

rear of the

ELNet LT

Energy &

Powermeter while tired or under the

influence of alcohol, medicines or any other
chemical substance that would tend to make
a person drowsy.

• Above all use common sense at all times.

1.4 — Warranty

CONTROL APPLICATIONS Ltd provides a 12- Month
warranty against faulty workmanship or components from date
of dispatch under the condition that the product was properly
installed and used.

CONTROL APPLICATIONS Ltd does not accept liability for
any damage that may be caused by natural disasters (such as
floods, fire, earthquake, lightening etc.).

CONTROL APPLICATIONS Ltd does not accept liability for
any damage that may be caused by malfunction of the ELNet

LT

Energy & Powermeter.

9

CONTROL APPLICATIONS Ltd will advise the customer on
the proper installation and use of the ELNet LT

Energy &

Powermeter

,

but will not accept any responsibility that the
instrument is suitable for the application for which it was
originally purchased.

This warranty may become void if the Installation, Parameter
Configuration & Setting Instructions are not carried out
according to the instructions set out by CONTROL
APPLICATIONS Ltd.

The

ELNet LT

Energy & Powermeter

has no user
serviceable parts and should be opened and serviced by a duly
qualified authorized representative only. The sensitive
electronics could become damaged if exposed to a static
environment. This action would void the warranty.

This warranty is limited to the repair and/or replacement at
CONTROL APPLICATION Ltd sole discretion of the defective
product during the warranty period. Repaired or replaced
products are warranted for ninety (90) days from the date of
repair or replacement, or for the remainder of the original
product’s warranty period, whichever is longer.

CONTROL APPLICATIONS Ltd is always at your service to
advise the customer on any problem that may be encountered
regarding any installation, operation, parameter & configuration
settings or maintenance.

10

1.5 — Your comments are welcome

CONTROL APPLICATIONS Ltd. sincerely thanks you for
choosing our ELNet LT

Energy & Powermeter

.

We are
confident that it will provide you with many years of trouble
free service and give you all the power and energy information
and history that you expected from the instrument when you
bought it.

While every effort was made to keep the information as reliable,
helpful, accurate and up to date as possible, all possible
contingencies cannot be covered. Technical or typographical
errors could occur, and we would be happy to receive any
comments, criticisms or notifications of any such errors from
you, our valued customer.

Address: FENIKS PRO d.o.o.

Zagrebška cesta 90

2000 Maribor

Slovenia

EUROPE

Tel: [phone]

Fax: [phone]

Electronic Address: [email protected]

11

1.6 — Disclaimer

Information in this User Manual is subject to change without
notice and does not represent a commitment on the part of
CONTROL APPLICATIONS Ltd.

CONTROL APPLICATIONS Ltd supplies this User Manual as
is without warranty of any kind; either expressed or implied,
and reserves the right to make improvements and/or changes in
the manual or the product at any time.

While it is the intention of CONTROL APPLICATIONS Ltd to
supply the customer with accurate and reliable information in
this User Manual, CONTROL APPLICATIONS Ltd assumes no
responsibility for its use, or for any infringement of rights of the
fourth parties which may result from its use.

This User Manual could contain technical or typographical
errors and changes are periodically made to the information
herein; these changes may be incorporated in new editions of
the publication.

12

CHAPTER 2 —

INSTALLATION

In this Chapter you will find the information and instructions
that the Installation Technician needs to mount and connect the

ELNet LT

Energy & Power Powermeter

• During operation, hazardous voltages are

present in connecting cables and terminal
blocks.

• Fully qualified personnel must do all work.

Failure to follow this rule may result in
serious or even fatal injury to personnel
and/or damage to equipment.

• Refer to Section 1.3 Safety information

before carrying out any installation.

• Read this manual thoroughly and make sure

you understand the contents before
connecting the ELNet LT

Energy &

Powermeter

to any power source.

WARNING!

13

2.1 — Contents of packaging

To unpack the

ELNet LT

Energy & Power Powermeter

The ELNet LT Energy & Powermeter is packed and
shipped in a carton approximately 24.5 cm long X 19 cm wide
X 12 and cm high.

Before opening the package, ensure the area, clean and dry.

Without using any sharp instruments, carefully open the carton
of the ELNet LT Energy & Powermeter.

Please check the contents of the carton, it should contain:

1.

New ELNet LT Energy & Powermeter

.

2. ELNet LT User Manual (This book).

3. Test Certificate and Certificate of Compliance (C.O.C).

4. 2 X two pole connector plugs.

14

2.2 — Mechanical mounting

To Mount the

ELNet LT

Energy & Powermeter

1. Choose a suitable location, and prepare a

rectangular hole according to the dimensions
shown in Figure 2.1

Figure 2.1 Panel Cutout

Do not mount the

ELNet LT

Energy & Powermeter too

close to any main electrical conductors

Allow sufficient space to carry out maintenance to the back of
the

ELNet LT

Energy & Powermeter

NOTE!!

Width
90 mm

Height
90 mm

15

2. Slide the

ELNet LT

Energy &

Powermeter

into the pre-prepared
rectangular hole (ensure it is the right way
up), then push the four mounting clips into
position. Use mild force to ensure the clips
are securely positioned on the outer case of
the ELNet LT

Energy & Powermeter.

3. Ensure the ELNet LT

Energy &

Powermeter

is firmly in place.

Figure 2.2 Mounting Clips

16

2.3 — Wiring Schematics

To wire up the

ELNet LT

Energy & Powermeter

No galvanic connection with the measurement current wire
(the current wire is passing through the current CT hole).

Figure 2.3 Schematic Wiring Diagram "Star" connection

17

No galvanic connection with the current measurement
wires, the current wires are passing through the current
transformer opening.

Figure 2.4 Schematic Wiring Diagram "Delta" connection

18

No galvanic connection with the current measurement
wires, the current wires are passing through the current
transformer opening.

Figure 2.5 Schematic Wiring Diagram "Open Delta - 2PTs

2CTs/3CTs" connection

19

PowermeterEnergy &

LT 2013 ELNet

New model

The current measurement wires are connected with screws
to build in standard connectors or optional 60 mm
connectors.

Figure 2.6 Schematic Wiring Diagram "Star" connection

20

The current measurement wires are connected with screws
to build in standard connectors or optional 60 mm
connectors.

.

Figure 2.7 Schematic Wiring Diagram "Delta" connection

21

The current measurement wires are connected with screws
to build in standard connectors or optional 60 mm
connectors.

Figure 2.8 Schematic Wiring Diagram "Open Delta - 2PTs

2CTs/3CTs" connection

22

ELNet LTP

Energy & Powermeter

No galvanic connection with the measurement current wire

(the current wire is passing through the current CT hole).

23

No galvanic connection with the measurement current wire

(the current wire is passing through the current CT hole).

24

No galvanic connection with the measurement current wire

(the current wire is passing through the current CT hole).

25

2.4 — Rear Panel Connections

Please re-read section 1.3 for safety instructions.

To connect the Rear Panel

All Connections, except those to the CT core of the ELNet LT

Energy & Powermeter

are made via terminal connector plugs
(Voltage input, Power Supply, Communication etc.).
Maximum recommended tightening torque for the connector
screws is 0.5 Nm.
The CT cores of the ELNet LT

Energy & Powermeter

are
located externally on the rear of the instrument and the lead
from the leg of the external Current Transformer must pass
through in the correct direction.

NOTE!

Ensure all the connections to the leads of the current
transformer wiring are secure and there is no mechanical
strain on the wire. The cross section of the leads to the
current transformer must be compatible to the power of the
current transformer. We recommend a power transformer
with at least 3VA and the length of the wiring of the
transformer no longer than 3m.

Insert the leads from side “L” of the external Current
Transformers to the ELNET current transformers side “L” and
from side “K” of the ELNET current transformers back to side
“K” of the external transformers.

26

WARNING!

WARNING

Never allow an open circuit between the two Current
Transformer leads.

Repeat the procedure for Line 2 and Line 3.

Connect the rest of the connections to the ELNet LT

Energy

& Powermeter

by means of terminal connector plugs.
The Rear Panel (See Figure 2.4) has all connections printed and
is simple to follow. (See table 2-1 for connections)

Figure 2.12 Rear Panel

27

Figure 2.13 New Model Rear Panel

Figure 2.14 LTP Model Rear Panel

28

Pin

Designation

Description Remarks

V

1

Line1 Supplied Voltage Through a 6Amp fuse

V

2

Line2 Supplied Voltage Through a 6Amp fuse

V

3

Line3 Supplied Voltage Through a 6Amp fuse

N

Neutral Measurement neutral Line

Pin

Designation

Description Remarks

I

1A

From Current
Transformer on Line1

Note the correct direction to
insert the lead.

Will show 0 Amp if no
voltage connected.

I

2A

From Current
Transformer on Line2

Note the correct direction to
insert the lead

Will show 0 Amp if no
voltage connected.

I

3A

From Current
Transformer on Line3

Note the correct direction to
insert the lead

Will show 0 Amp if no
voltage connected.

~

Power Supply 110 –
260 VAC

Or 110-260 VDC, external
power supply or bridged
from phase measurement

Np

Neutral Neutral of external power

supply

29

RS485 - RS485 Comm. (-) Line

RS485 + RS485 Comm. (+) Line

Digital Out Dry contact between

pin 4 and 5

Max. Load 150 mA

Digital
Input

Digital inputs 6 and 7
for monitoring

On = 220VAC

Table 2.1 Rear Panel connections

30

2.5 — Digital Outputs and Inputs.

ELNet LT

Energy & Powermeter has as default 1 Digital Output and

2 Digital Input connections at its back side (additional IO can be
implemented by using additional external modules).

Digital Output:

The Digital Output of the LT can be used to transmit pulses of energy to
external BMS controller (chapter 4.6) or to close contact upon alarm
(chapter 5.4.3) which can be defined in the LT (cannot be used for both
simultaneously). The Digital Out closes contact of SSR between pins 4 and
5, the maximum load is 150mA.

Digital Inputs:

In order to change the status of the Digital Inputs of the LT a 220 VAC
contact must be provided. The indication voltage should be supplied from
one of the measured phases. The digital inputs can be monitored by
communication and appear at the communication list.

Figure 2.15 Digital In \ Digital Out wiring example

31

2.6 — Manufacturing Data.

Press F1 on the keyboard for 6 seconds. The following screen will appear.

Figure 2.16 Manufacturing data

Number Screen Description

1 Ep. Date Production date of software operating system

2 Version Bios Revision

3 CT Rate Current transformer ratio

4 Type Hardware type and electrical network connection

5 Unit ID

Unique

identifying number

6 IP Address IP Address ( option)

7 Comm # Communication address of RS485 Modbus

8 Line: Auto \ OFF \ Swap – status of auto correction

mode for K L wiring

Table 2.2 Production Data

32

CHAPTER 3 —

USING ELNet LT POWERMETER

In this chapter you will find descriptions and functions of the
front panel and the control buttons and how to use them.

3.1 — Front Panel

To operate the front panel

The Front Panel has a graphic screen and 6 operating buttons.

All the readings are shown on a state of the art 320 X 240
resolution graphic screen and are explained in detail in Chapter

5.

The Control Buttons and their functions are fully explained in
Section 3.2.

Figure 3.1 Front Panel

33

3.2 — Control Buttons

To operate the Control Buttons on Front Panel

The

ELNet LT

Energy & Powermeter has six Control

Buttons. With these buttons the

User

and

Senior Electrical

Engineer

can achieve all the functions necessary.

The Control Buttons are arranged on a keypad below the display
screen and require slight finger pressure to click.

Button “ENTER” accepts the choice and executes the
commands.

Button “F1”, “F2”, “F3”, “F4” performs the function that the
arrow above is pointing to (e.g. move the cursor), or selects the
prompt that the arrow is pointing to.

Button BACK returns to the previous step or to the Main Menu.

34

3.3 — Lock Utility

To lock and unlock the Control Buttons

The Control Buttons can be locked against any unauthorized or
accidental usage.

NOTE!

Only sub menus can be locked. The Lock Utility
does not work on the Main Menu

To lock press “ENTER” for six (6) seconds.

A “Keyboard Locked!” message appears on the screen when any
button is pressed.

To unlock simply press

“ENTER”

for six (6) seconds.

A “Keyboard Unlocked!” message appears on the screen and
normal functions can resume.

In the event of a general power failure, the

ELNet LT

Energy

& Powermeter will return to the screen that was showing before

the power failure occurred.

35

CHAPTER 4 —

NECESSARY ELNet LT SETTINGS

In this chapter you will find instructions to set the minimum
settings that are necessary to allow the ELNet LT

Energy &

Powermeter

to function properly.

• The selection, installation and settings of the

Current Transformer are the most vital and
fundamental actions required to ensure the

accuracy of the

ELNet LT

Energy

Powermeter.

• It is essential to know the ratio of the Current

Transformer being installed into the system in
order to set the parameter for the Current
Transformer correctly.

• All three main current Lines MUST have

Current Transformers of the same ratio installed
onto them.

WARNING!

36

4.0 — Entering code

The most important setting necessary for the proper
functioning of the

ELNet LT

Energy &

Powermeter is the Current Transformer setting.

The cross section of the leads to the current Transformer
must be compatible to the power of the current
transformer. We recommend a power transformer with at
least 3VA and the length of the wiring of the transformer
no longer than 3m.

1 From Main Menu scroll to Technical Menu.
2 Click “ENTER”.

The Enter Code screen appears

Figure 4.1 Enter Password

The password is 1.

37

3 Use the buttons F3 & F4 to move the cursor, to set the value

use buttons F1 &F2.

4 Click “ENTER”

.

If the incorrect password is inserted into the Password
field, an Error message appears and the password
should be reentered

The Technical Menu screen appears

Figure 4.2 Technical Menu

Use the buttons F3 & F4 to move the cursor, selecting "NEXT"
will lead you to more functions that can be set by the
technician.

4.1 — Settings for Current/Voltage Transformer

To set or change settings for Current/Voltage Transformer
See Section 4.0 for instructions to arrive at the Technical Menu

38

1 Scroll to Transformers ratio and select current or voltage

transformer ratio to be set.

2 Click “ENTER”.

The Current / Voltage Transformer screen appears

Figure 4.3 Current Transformer

The present setting for the Current Transformer is shown.
Use the buttons F3 & F4 to move the cursor, to set the ratio use
buttons F1 &F2.

The method for setting for the Voltage Transformer is the
same.

4.2 — Electrical Connection Check

To avoid any problems arising from incorrect Voltage
Connections or accidental reversal of Current Transformer
Connections, it is necessary to perform a Phase Order Check
before continuing.

NOTE!

39

The proper current direction connection ("K" and "L") between
the External CT and the ELNet is very important in case that the
energy direction is monitored and the energy should be logged as
Import (consumed) or Export (produced) modes.
ELNet energy powermeter can auto correct the wrong current
direction wiring (in case the Export energy is not required to be
logged).
As default the device is defined to perform the auto correction. In
order to change these settings and deactivate or activate the auto
correction mode:

1 See Section 4.0 for instructions to arrive at the

Technical Menu

2 From Technical Menu click Next and scroll to

Wiring and press "Enter".

3 Scroll to Current Lines and press "Enter".
4 The Current Lines screen will appear:

Figure 4.4 Current Lines

5 Click Auto to activate auto correction mode or click

Fix to deactivate (in case the Export energy is
required to be logged).

40

To perform Electrical connection Check

1 From Main Menu scroll to Technical.

2 Click

“ENTER”.

The Enter Code screen appears.

3 Enter code: 11

The Connections Test screen appears

Figure 4.5 Connections Test

Very important – very common problem!!!!!

The information above and under is accurate only if there is a phase
coloration between the current and voltage.

The current (I1, I2, I3) and the voltage (V1, V2, V3) should be
connected in this order.

41

Table 4.1 Voltage and Current Messages

Phase Order Messages

Table 4.2 Phase Order Messages

Message

Voltage Current

OK

Voltage “OK” present on Lines.
If “OK” is not present on 3
Lines, then it is not connected
correctly

Current present in
Lines and synchronized
with Voltage Lines. If
“OK” is not present on
3 Lines, then it is not
connected correctly

OPP

Wired in incorrect
direction

NO

No Voltage

No current

Message

Voltage

OK

Correct Phase Order of Voltage Connections

OPP

Incorrect Phase Order i.e. Line 2 does not follow Line 1
and/or Line 1 does not follow Line3

42

4.3 — Change language

To change language on the display screen

See Section 4.0 for instructions to arrive at the Technical Menu
From Technical Menu scroll to "NEXT" and "LANGUAGE".
1 Click

“ENTER”

.

The Set Language screen appears

Figure 4.6 Set Language

4.4 — Time Settings

To set Time

See Section 4.0 for instructions to arrive at the Technical Menu
From Technical Menu scroll to Set clock.

1. Click

“ENTER”

.

The Set Clock screen appears

Figure 4.7 Set Clock

43

2. Use the buttons F3 & F4 to move the cursor, to set the value

use buttons F1 & F2.

4.5 — Date Settings

To set Date

See Section 4.0 for instructions to arrive at the Technical Menu.

From Technical Menu scroll to Set Date

1 Click “ENTER”

The Set Date screen appears

Figure 4.8 Set Date

Use the buttons F3 & F4 to move the cursor, to set the value use
buttons F1 & F2.

The Date Format is DD/MM/YY

Day/Month/Year

44

4.6 — Setting energy pulse out

The digital output (chapter 2.5) can be used as a pulse output, each
pulse equivalent to pre define energy consumption value, in order
to set the pulse output - See Section 4.0 for instructions to arrive
at the Technical Menu.

From Technical Menu:

1 Scroll to SET ENERGY PULSE
2 Click “ENTER”.
3 If the Digital Out was defined to be used

for alarm the following message screen
will appear

Figure 4.9 Changing Digital Out usage

4 Click SET (F1) to access the change mode

and click again SET (F1) in order to
change between alarm mode to energy
pulse out mode.

5 The SET ENERGY PULSE screen

appears:

45

Figure 4.10 Set Energy Pulse

6 In order to set the KWH value pre pulse

scroll to KWH Per One Pulse and click
"ENTER".

7 In order to define how wide is the pulse

scroll to Pulse Time and click "ENTER".

8 Please note that while you are using the

output for energy pulse usage you cannot
use the same output for alarms.

4.7 — Delta/Open Delta/Star Electrical network
definition

The ELNet LT

can be installed in three types of electrical

networks:

DELTA – a system without neutral line.

Open Delta (Aron) – a system without neutral line.

STAR – a system with neutral line

.

46

In order to change the type of the electrical network connected to
the ELNet LT See Section 4.0 for instructions to arrive at the
Technical Menu.

1 From Technical Menu scroll to "Next" then to "Wiring” and

Click “ENTER”.

2 Scroll to “Delta/Star System”.
3 Click “ENTER”.

The Connection screen appears

Figure 4.11 Wiring Connections

4 Use “F2”, “F3” or "F4" in order to change the connection

type. When you are using "DELTA"/”OPEN DELTA”
networks the currents (line currents) and the voltages
(between phases) are not in the same phase therefore part of
the measurements are not applicable and part of the display
screens are not applicable.

47

CHAPTER 5 —

FRONT PANEL DISPLAYS

In this chapter you will find instructions on how to obtain the
readings that the ELNet LT

Energy & Powermeter

provides,
e.g., Current, Voltage Power, Power Factor, Energy, and Power
quality.

5.1 — Current Voltage & Frequency

To display Current Voltage and Frequency for all 3 Phases

1 From Main Menu scroll to Voltage, Current, Hz.

Figure 5.1 Main Menu
2 Click “ENTER”.

The Current Voltage and Frequency screen appears

Figure 5.2 Voltage, Current, Hz

48

3 Scroll to REAL TIME DISPLAY and click “ENTER”

The Current Voltage and Frequency screen appears

Figure 5.3 Voltage screen

4 Use “F1” in order to display voltage values.
5 Use “F2” in order to display current values.
6 Use “F3” in order to display Current and Voltage

table view.

7 Use “F4” in order to display Frequency values.

49

5.2 — Reset I , V , F Peak values

In order to clear old peak values

1 From Main Menu scroll to Voltage, Current, Hz.
2 Click “ENTER” The Current Voltage and Frequency screen

appears.

3 Scroll to MIN/MAX RESET and click “ENTER”.

The Enter Code screen appears

Figure 5.4 Enter reset code

In order to clear old peak values enter password 6474

.

Use the buttons F3 & F4 to move the cursor, to set the value
use buttons F1 &F2.

5.3 — Leakage Current (LTP only)

Measuring the leakage current provides a very important safety
indication. If the leakage current exceeds the required safety
standards level a special and urgent examination of the electrical
system is required. ELNet LTP Energy & Powermeter
measures the leakage current by using the existing standard
measurement current transformers.

50

To display the Leakage Current.

1 From Main Menu scroll to Voltage, Current, Hz.
2 Click “ENTER”.

The Current Voltage and Frequency screen appears.

3 Scroll to Leakage Current and click “ENTER”

The Leakage Current screen appears

4 In order to set the Allowed Leakage level, click on the F1

button.

The Allowed Leakage Current screen appears

51

Use the buttons F3 & F4 to move the cursor, to set the value

use buttons F1 &F2.

5.4 — Power Display

5.4.1 — Real time power display

To display Power for all 3 phases

1 From Main Menu scroll to Power, power factor Display.
2 Click “ENTER”.

52

The Power, Power factor screen appears

Figure 5.7 Power, Power factor

3 Scroll to REAL TIME DISPLAY and click “ENTER”.

The real time Power, Power factor screen appears

Figure 5.6 Power factor

4 Use “F1” in order to display Reactive Power values.
5 Use “F2” in order to display Power values table view.
6 Use “F3” in order to display Power Factor values.
7 Use “F4” in order to display total 3 lines active reactive and

apparent power values.

53

Parameter

Description

Unit

P Active Power for each Line Watts

Q Reactive Power for each Line VAR

S Apparent Power for each Line VA

Σ P Total Active Power for all 3 Lines Watts

Σ Q Total Reactive Power for all 3 Lines VAR

Σ S Total Apparent Power for all 3 Lines

VA

PF Power Factor

Table 5.1 Power Readings

5.4.2 —Reset power peak values

To display /reset power peak value

1 From Main Menu scroll to Power, power factor Display.
2 Click “ENTER”. The Power, Power factor screen appears.

3 Scroll to MIN/MAX RESET and click “ENTER” in order to

clear power peak value and power factor peak values.

4 In order to clear old peak values enter password 6474.
5 Use the buttons F3 & F4 to move the cursor, to set the value

use buttons F1 &F2.

5.4.3 — Power Demand

To display Power demand within two dates

1 From Main Menu scroll to Power, power factor

Display.

2 Click “ENTER”. The Power, Power factor screen

appears.
Scroll to POWER DEMAND and click “ENTER” in order to
display power demand values.

54

The Power Demand screen appears

Figure 5.9 Power Demand

5.4 —

Power Quality

NOTE!

Poor Harmonics could invoke a fine and damage to
the electrical system and can be improved by adding
filters.

The ELNet LT

Energy & Powermeter is

capable of displaying
Harmonics in Wave Form Graph, Harmonics Bar Graph, for
Voltage and Current.

55

5.5.1 — Wave Form Display

To display Wave Form Graphs

1 From Main Menu scroll to Power Quality.
2 Click “ENTER”

.

The Power Quality screen appears

Figure 5.8 Power Quality

3 Scroll to Waveform Display and click “ENTER”.

The Wave form Graphs screen appears

Figure 5.11 Voltage Graph

56

NOTE!

Available Waveform Graphs

1. Volts Line 1, Line 2 and Line 3

2. Current Line 1, Line 2 and Line 3

Use “F1” in order to display voltage waveform.

Use “F2” in order to display current waveform

Use “F4” in order to toggle between L1, L2, L3.

5.4.2 — Harmonics Analyzer & THD

For analyzing and display Harmonics Bar Graphs & THD

1 From the Main Menu scroll to Power Quality Display.
2 Click

“ENTER”

.

The Power Quality screens appear - See

Figure 5.18.

3 Scroll to Harmonics analyzer and click “ENTER”.

The Harmonics current Bar Graph screens appear

Figure 5.10 Harmonics bar Graph

57

Use “F1” “F2” in order to toggle the display between current
waveform and voltage waveform.

Use “F3” in order to toggle between L1, L2, L3 and All together.

Use “F4” in order to display and toggle between the harmonics
values up to the 64

th

harmony.

NOTE!

The bar graph of the 1st Harmonics (100%) is shown
without proportion to the other harmonics in order to
display properly all the other harmonics.

5.4.3 — Alarm Setup

To set the alarm level for electrical measurements

1 From Main Menu scroll to Alarm Screen.

2 Click

“ENTER”

.

The Alarm Screen screens appear.

Figure 5.11 Alarm Screen

58

3 Scroll to Alarm setup and click “ENTER”.

The Alarm setup screens appear, and you will be requested
to select the electrical measurement to be defined (voltage/
current / demand / KW IMP. / KW EXP) by pressing, “Enter”
and set the alarm levels.

5.6 — Energy Metering

To display active reactive and Apparent Energy values

1 From Main Menu scroll to ENERGY METER.
2 Click “ENTER”.

The Energy Meter screen appears

Figure 5.14 Energy meter

59

5.6.1 — Main Energy Meter

This meter will display the total energy that was measured and accumulated in
the meter from the moment the meter was connected to the power. This meter
is non erasable and the total energy that was measured and accumulated
cannot be changed or deleted.

By using the sub menu you will be able to:

By using “F1” The ELNet will display the amount of the energy used for
each rate:

RT1 = Rate number 1

RT2 = Rate number 2

RT3 = Rate number 3

ALL= All rates

By using “F2” The ELNet will display the amount of the energy used for
each line:

L1 = Line number 1

L2 = Line number 2

L3 = Line number 3

ALL= All Lines

By using “F3” The ELNet will display the amount of the active, reactive and
apparent energy:

P = only active energy

Q = only reactive energy

P = only Apparent energy

By using “F4” The ELNet will display the amount of the imported energy
and the amount of the exported energy:

EXP = energy exported

IMP= energy imported

60

5.5.2 — 2nd. Energy meter

This meter will display the total energy that was measured and accumulated in
the meter from the last “clear” of the accumulated energy data.

The accumulated energy data in this meter can be erasable (“cleared”) by the
user.

By using the sub menu you will be able to:

By using “F1” The ELNet will display the amount of the energy used for each
rate:

RT1 = Rate number 1

RT2 = Rate number 2

RT3 = Rate number 3

ALL= All rates

By using “F2” The ELNet will display the amount of the energy used for each
line:

L1 = Line number 1

L2 = Line number 2

L3 = Line number 3

ALL= All Lines

By using “F3” The ELNet will display the amount of the active, reactive and
apparent energy:

P = only active energy

Q = only reactive energy

P = only Apparent energy

By pressing and holding the “F4” button for 6 seconds ELNet will delete the
accumulated energy data:

CLR = Clear / Delete the accumulated energy data

61

5.5.3 — T.O.U Energy

The

ELNet LT

Energy & Powermeter record all energy

values according to the T.O.U (time of use) schedule.

Each country has different T.O.U (time of use) schedule , in order to
select the T.O.U schedule See Section 4.0 for instructions to arrive
at the Technical Menu

1 From Technical Menu scroll twice to NEXT.
2 Scroll to SELECT T.O.U RATES.
3 Click

“ENTER”

.

The Select TOU rates screen appears

Figure 5.13 Select TOU

62

4 Select the T.O.U (time of use) schedule.

5.6.4 — Periodic Energy meter

This meter will display the total energy that was measured and
accumulated between two dates which can be defined by the user.

By using the sub menu you will be able to:

By using “F1” (DATE) the user can define two dates in order to set the
period of time for calculating the active energy in this period:

By Using “F2” The ELNet will display the amount of the active energy
used for each rate:

RT1 = Rate number 1

RT2 = Rate number 2

RT3 = Rate number 3

ALL= All rates

By Using “F3” and “F4” The ELNet will display the amount of active
energy, from the selected dates:

MON+ = Change the date by adding a month.

MON– = Change the date by subtracting a month

.

63

CHAPTER 6

— COMMUNICATION

MODBUS Protocol

The

ELNet LT

Energy & Powermeter has a serial interface

port allowing direct interface with an external communication
network supporting the MODBUS Protocol.

MODBUS is an Industry Standard, widely known and commonly
used communications protocol. Using MODBUS provides
communication between a PC and up to 247 Powermeter slaves on a
common line - the PC being the master and the powermeters the
slaves. The PC initiates the transaction (either a query or broadcast)
and the Powermeter/s responds. Powermeters respond to the master
PC’s request, but will not initiate any transmission on its own. The
PC sends a single Query transaction and the Powermeter responds in
a single response frame and is capable of only one query and one
response at a time.

6.1 — MODBUS Framing

6.1.1— RTU Transmission Mode

MODBUS uses the standard Remote Terminal Unit (RTU)
transmission mode. RTU mode sends data in 8-bit binary EVEN
parity or 8-bit binary NO parity data format. For the ELNet LT

Energy & Powermeter

to successfully communicate, choose one in

the communication Set Up.

64

Table 6.1 RTU Data Format

6.1.2 — The RTU Frame Format

Query and response information is sent in frames. Each frame
contains:

Address

Function (See Section 6.1.4 for descriptions of functions),

Data

Check

Address Function

Data Check

8 bits 8 bits N * 8 bits 16 bits

Table 6.2 R T U Message Frame Format

If the receiving device (Powermeter) detects a time laps of five
characters, then it will assume the message is incomplete and will
flush the frame. The device then assumes that the next byte received
will be an address. The maximum query and response message length
is 256 bytes includuing check characters.

Field No. of bits

Start bit 1

Data bits

8

Parity 1

Stop it 1

65

6.1.3 — Address Field

Each Powermeter is designated in a network system by a user
assigned address. The Address can be any number between 1 and

247. The Powermeter will only respond to its own specifically
assigned address.

6.1.4 — Function Field

The function field contains the code that tells the Powermeter what
action to perform.

The

ELNet LT

Energy & Powermeter

uses and responds to four

standard Message Format Functions.

Function 03

Function 04

Function 06

Function 16

Function Meaning in MODBUS

Action

Function 03

Read holding register Obtain data from Powermeter

(Read register)

Function 04

Read input register Obtain data from Powermeter

(Read register)

Function 06

Preset single register Transmit data to Powermeter

(Write single register)

Function 16

Preset multiple register Transmit data to Powermeter

(Write multiple register)

Table 6.3 Function Codes

66

6.1.5 — Data Field

The Data field contains the body of the message and contains
instructions from the PC master to the Powermeter slave to perform
a particular action or respond to a query. The reply message from the
Powermeter will be information contained in one or more of its
registers.

6.1.6 — Check Field

The error check field contains the result of Cyclical Redundancy
Check (CRC). The start of the message is ignored in calculating the
CRC.

For more detailed information on CRC, refer to the MODBUS
Protocol Reference Guide.

67

6.2 — Registers for ELNet LT Powermeter

The

ELNet LT

Energy & Powermeter is capable of

supporting either Function 03 or Function 04 Message Format (see
Table 6-3). In a reply to a query from the PC master for a reading
from a particular field, the response from the Powermeter can be
either in Format 03 or Format 04 but will depend on which Format
the query was originally sent.

The difference is significant because by using Function 03 the
ELNet LT will only send the INTERGER part of the field value
requested and the PC master will only display the INTERGER part
of the field value.

Function 04, on the other hand, is capable of sending two separate
halves of the full FLOAT requested information (each half
contained in a separate register). Then it is the task of the PC
master to merge the two halves into a full FLOAT reply (For more
detailed information See IEEE Standard 754 Floating-Point).

E.G. 1 If the user’s PC master supports Function 03, then the reply

will contain the INTERGER part of the field only.

The PC master requests the Voltage from Line1, and the
actual Voltage in that field is 230.5 Volts.

Function 03 will respond with the INTERGER only i.e.
230V.

68

E.G. 2 If the user PC master supports Function 04, then the reply

will contain the information stored in the two registers
asssigned to that field and will contain the full, accurate

reply.

The PC master requests the Voltage from Line1, and the actual
Voltage in that field is 230.5 Volts.

Function 04 will respond with a composite reply of both
register 1 and 2 giving the full FLOAT value (in IEEE Format)
from that field i.e. 230.5V.

6.2.1 — Registers addresess

The

ELNet LT

MODBUS registers addresses are updated all the time

and can be downloaded from the following web site:

http://www.ddc.co.il/ELNet-pdf/ELNet_comm.pdf

The MODBUS registers addresses numbering order specify at the above
mentioned web address set as a defaults but can be changed in order to be
fit to the SCADA/HMI drivers.

In order to change the MODBUS registers addresses numbering order:

See Section 4.0 for instructions to arrive at the Technical Menu

1 Scroll to NEXT
2 Scroll to PARAMETERS ORDER.
3 Click “ENTER”

69

The PARAMETERS ORDER screen appears

Figure 6.1 Parameters Order

Select the requested order that compatible to the driver installed in
your SCADA/HMI

6.3 — Communication Connections

The ELNet LT Energy & Powermeter supports RS485
communication. Connections are provided on the Rear

Panel, (Please refer to section 2.3) and are made by means of the
connectors provided.

6.4 — Communication Settings

To enable the User to connect the ELNet LT

Energy &

Powermeter

to a PC computer for successful communications, the
Communication Setup parameters of both must match; i.e. the port
of the PC and the configuration settings of the Power meter.

Address
Baud Rate
Parity

70

6.4.1 — Communication Address

Each Power meter in a communication system must have its own
unique address.

Because the ELNet LT

Energy & Powermeter

works on

MODBUS, the available addresses are - from ‘1’ to ‘247’

6.4.2 — Baud Rate

The Baud Rate is the communication speed in Bits per second
(BPS) that the ELNet LT

Energy & Powermeter

communicates

with the PC. The better the communication line Quality, the faster
the communications may be.

If the communication line is routed through a “noisy”
environment, it may be necessary to decrease the Baud Rate.

Available Baud Rates for the

ELNet LT Powermeter:

600 bps

1200 bps

2400 bps

4800 bps

9600 bps

19200 bps

6.4.3 — Parity

The choices of parity are either NONE or EVEN (see Section

6.1.1 for description of Parity)

71

6.5 — Communication Set Up

6.5.1 — Set up Serial Communications

See Section 4.1 for instructions to reach the Technical Menu.
1 From Technical Menu scroll to Set Communication.
2 Click

“ENTER”

.

3 Scroll to "Serial Comm." and click "Enter".

The Serial Communication Setup screen appears

Figure 6.2 Serial Communication Setup

Use buttons F1 &F2, to set the values

Use the buttons F3 & F4 to move the cursor

NOTE!

When the selection is made it takes immediate affect
with no further action required.

72

6.5.2 — Set up Ethernet Communications

See Section 4.1 for instructions to reach the Technical Menu.
1 From Technical Menu scroll to Set Communication.
2 Click

“ENTER”

.

3 Scroll to "Ethernet" and click "Enter".

The Ethernet Communication Setup screen appears

Figure 6.3 Ethernet Communication Setup

4 Scroll to "Set IP" and click "Enter".

The IP Setup screen appears

Figure 6.4 IP Setup

73

Use buttons F1 &F2, to set the values

Use the buttons F3 & F4 to move the cursor

5 If required: repeat steps 1-4 to set the GATEWAY and

MASK.

6 The MAC address is set automatically however it can

be changed as well by repeating steps 1-4.

6.6 — Communication with UniArt Software

CONTROL APPLICATIONS Ltd propriety software, “UniArt” is
used to Read and Write Registers of the ELNet LT

Energy

Powermeter.

Each Item number in the Registers Table is a unique
field containing information. The UniArt software manages each
Item number as a parameter.
Refer to the UniArt manual how to set up parameters.

To read fields using UniArt

1 Find the reading required in the MODBUS Registers

Table

2 Note the Item Number from the Registers Table

3 Go to the correct File number

Since File capacity in UniArt is limited to 128 parameters,
the information contained in the ELNet LT fields is stored
in several files.

File number is determined by the Item number

File # 0 contains Item number 1 - 128

File

#

1 contains Item number 129 – 256

File # 2 contains Item number 257 – 384

File # 3 contains Item number 385 – 512

74

4 Go to the correct Point number within that file

Point number is determined by the formula:

Item number – [FILE X 128] = Point Number

E.G. 1 If the user the wishes to read Voltage Line 2 (Item No 2)

By applying the formula: 2 - [0 X 128] = 2
File = 0 and Point within that file = 2

E.G. 2 If the user the wishes to read 30th Harmonics for Volts Line1

(Item No 330)
By applying the formula: 330 - [2 X 128] = 74
File = 2 and Point within that file = 74

E.G. 3 If the user the wishes to read 7th Harmonic for Current Line 3

(Item No 467)
By applying the formula: 467 - [3 X 128] = 83
File = 3 and Point number within that file = 83

More Examples

E.G. No Item

No

Field Description File Point

1 2 Voltage Line 2 0 2

2 330 30th Harmonics for Volts Line1 2 74

3 467 7th Harmonic for Current Line 3 3 83

4 128 0 128

5 129 1 1

6 256 1 128

7 257 2 1

8 384 20th Harmonics for Volts Line 3 2 128

9 385 21st Harmonics for Volts Line3 3 1

Table 6.4 Function Codes

75

CHAPTER 7 — Specifications

Table 7.1 Specifications

All technical specifications are subject to change without notice.

Item

Description

Power requirements 85-260V AC or 110-300V DC

,60/50 Hz, 5VA

Dimensions (HxWxD) 960x960x80 mm

Shipping Weight 620 gr.

Measuring voltage limits 700VAC

Measuring current limits 6 A

Operating Voltage limits 1000 V

Operating Current limits 50 A

Enclosure material ABS + Anti flame

Display Graphic 64x128

Operating temperature -20 - + 70 C

Storage temperature -20 - + 80 C

Humidity 0- 90 RH%

Voltage input terminals VL – E10 1708

Communication port RS485

Mounting Front Panel Mounting

76

7.1 — Measurement & Display

Measurement & Display (scaling factor 1)

Measurement

Parameter

Display Range

in direct

connection

(scaling factor 1)

Measuring in

direct

connection

(scaling factor 1)

Display Range

Current

0.001 – 6A 0.001 – 6A 0.001 – 99999KA

Neutral Current
(calculated )

0.001 – 6A 0.001 – 6A 0.001 – 99999KA

Voltage L-N

0.000 – 550 V 0.000 – 550 V 0.001 – 99999KV

Voltage L-L

0.000 – 650 V 0.000 – 650 V 0.001 – 99999KV

Frequency (Hz)

45.001-65.001 Hz 45.001-65.001 Hz 45.001-65.001 Hz

Active power
total\phase

0.000W – 99999MW

Reactive power
total\phase

0.000VAR ­99999MVAR

Apparent power
total\phase

0.000VA -

99999MVA

Power Factor
(cap.\ind.)

-1.000 ÷ 1.000 -1.000 ÷ 1.000 -1.000 ÷ 1.000

Active Energy
total\phase

0.001WH –

99999999MWH

Reactive Energy
total\phase

0.001VARH -

99999999MVARH

Apparent
Energy
total\phase

0.001VAH -

99999999MVAH

77

Measurement & Display (scaling factor 1)

Measurement

Parameter

Display Range

in direct

connection

(scaling factor 1)

Measuring in

direct

connection

(scaling factor 1)

Display Range

Harmonic THD
V\I

0.000 – 100%

Partial
Harmonic V\I

0.000 – 100%

Operating hour
meter

99999-HH:MM:SS

Table 7.2 Measurement & Display

78

Index

Appendix A — Installation & Configuration Check List

INSTALLATION CHECK LIST

Description

Date Signature

Check contents of packaging

Remove from packaging

Prepare hole

Mount Powermeter

Connect Powermeter power supply

Connect 3 Current Transformers

Connect 3 Voltage lines

Connect Neutral line

Set Current Transformer Ratio

Connect Communication lines

Check Phase Order Connections

Set Time and Date

Appendix A Table - Installation & Configuration Check List