Iskra iMT440 User manual

CONTENTSiMT440 MEASURING TRANSDUCER
User's Manual SR100 Supervision Relay
I
-
Multifunction Transducer iMT440
July 2021• Version 1.00

CONTENTS
User's Manual iMT440 Measuring transducer
I
Contents
iMT440 MEASURING TRANSDUCER ............................................................................... 1
SECURITY ADVICE AND WARNINGS ............................................................................... 2
Warnings, information and notes regarding designation of the product ................................ 3
Before switching the device on ................................................................................................ 3
Device switch-of Warning......................................................................................................... 4
Disposal..................................................................................................................................... 4
BASIC DESCRIPTION AND OPERATION ........................................................................... 5
Contents.................................................................................................................................... 5
Description................................................................................................................................ 5
Abbreviation/Glossary.............................................................................................................. 7
Purpose and use of different type of measuring transducer ................................................... 8
Multifunctional transducer iMT440 .............................................................................................8
Type differences...........................................................................................................................8
CONNECTION...............................................................................................................10
Mounting ................................................................................................................................ 11
Electrical connection............................................................................................................... 11
Connection of input/output modules..................................................................................... 13
Communication connection.................................................................................................... 13
RS232 ...................................................................................................................................... 14
RS485 ...................................................................................................................................... 14
USB.......................................................................................................................................... 14
Survey of communication connection.................................................................................... 15
Connection of auxiliary power supply .................................................................................... 15
SETTINGS .....................................................................................................................16
MiQen software...................................................................................................................... 16
Setting procedure.......................................................................................................................17
General Settings...................................................................................................................... 17
Connection.............................................................................................................................. 19
Connection mode.......................................................................................................................19
Setting of current and voltage ratios .........................................................................................19
Used voltage/current range (V/A)..............................................................................................19
Nominal frequency.....................................................................................................................19
Energy flow direction .................................................................................................................19
This setting allows manual change of energy flow direction (IMPORT to EXPORT or vice versa)
in readings tab. It has no influence on readings sent to communication. .................................19
CT connection.............................................................................................................................19
Communication....................................................................................................................... 20
Communication parameters (COM 1) ........................................................................................20
Modbus table .............................................................................................................................20
USB Communication...................................................................................................................21
Service USB Communication ......................................................................................................21

Contents
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User's Manual iMT440 Measuring transducer
Security....................................................................................................................................21
Password-Level 0 >PL0) ..............................................................................................................21
Password-Level 1 >PL1) ..............................................................................................................21
Password-Level 2 >PL2) ..............................................................................................................21
A Backup Password->BP)............................................................................................................21
Password locks time >min).........................................................................................................22
Password setting ........................................................................................................................22
Password modification ...............................................................................................................22
Password disabling .....................................................................................................................22
Energy .....................................................................................................................................22
Active tariff .................................................................................................................................22
Common energy exponent.........................................................................................................22
Counter divider...........................................................................................................................22
Inputs and outputs..................................................................................................................23
Analogue output module............................................................................................................23
Fast analogue output module ....................................................................................................24
Relay output module ..................................................................................................................25
Alarms .....................................................................................................................................26
Alarms setting.............................................................................................................................26
Reset........................................................................................................................................26
Reset energy counters (E1, E2, E3, E4).......................................................................................26
Reset MD values.........................................................................................................................26
Reset the last MD period............................................................................................................26
Reset Min / Max values ..............................................................................................................26
Reset alarm output.....................................................................................................................26
MEASUREMENTS .........................................................................................................27
Measurements (online)...........................................................................................................27
Daily energy consumption profile ..............................................................................................27
Available connections .............................................................................................................28
Survey of supported measurements regarding connection mode.........................................29
Explanation of basic concepts.................................................................................................31
Sample factor Mv .......................................................................................................................31
Average interval Mp ...................................................................................................................31
Power & energy flow ..................................................................................................................31
Calculation and display of measurements..............................................................................31
Present values.........................................................................................................................32
Voltage........................................................................................................................................32
Current .......................................................................................................................................32
Active, reactive and apparent power .........................................................................................32
Power factor and power angle ...................................................................................................33
Frequency...................................................................................................................................33
Energy counters..........................................................................................................................33
MD values...................................................................................................................................34
THD − Total harmonic distortion ................................................................................................34
TEHNICAL DATA...........................................................................................................35
Accuracy..................................................................................................................................35
Inputs ......................................................................................................................................36
Connection..............................................................................................................................36
I/O modules.............................................................................................................................37
Communication.......................................................................................................................38
Electronic features..................................................................................................................38
Safety features ........................................................................................................................38
Mechanical..............................................................................................................................39

Contents
User's Manual iMT440 Measuring transducer
III
Environmental conditions....................................................................................................... 39
Dimensions ............................................................................................................................. 39
Connection table..................................................................................................................... 40
APPENDICES.................................................................................................................41
Appendix A.............................................................................................................................. 41
Appendix B.............................................................................................................................. 50

iMT440 MEASURING TRANSDUCER
User's Manual iMT440 Measuring transducer
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iMT440 MEASURING TRANSDUCER

SECURITY ADVICE AND WARNINGS
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User's Manual iMT440 Measuring transducer
SECURITY ADVICE AND WARNINGS
Please read this chapter carefully and examine the equipment carefully for potential damages which might arise
during transport and to become familiar with it before continue to install, energize and work with a measuring
instrument.
This chapter deals with important information and warnings that should be considered for safe installation and
handling with a device in order to assure its correct use and continuous operation.
Everyone using the product should become familiar with the contents of chapter »Security Advices and Warnings«.
If equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may
be impaired.
PLEASE NOTE
ISKRA d.o.o. assumes no responsibility in connection with installation. This booklet contains instructions for
installation and use of measuring instrument. Installation and use of a device also includes handling with dangerous
currents and voltages therefore should be installed, operated, serviced and maintained by qualified persons only. If
there is any doubt regarding installation and use of the system in which the device is used for measuring or
supervision, please contact a person who is responsible for installation of such system.

SECURITY ADVICE AND WARNINGS
User's Manual iMT440 Measuring transducer
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Warnings, information and notes regarding designation of the
product
Used symbols:
See product documentation.
Double insulation in compliance with the EN 61010−1 standard.
Functional ground potential.
Note: This symbol is also used for marking a terminal for protective ground
potential if it is used as a part of connection terminal or auxiliary supply terminals.
Compliance of the product with directive 2002/96/EC, as first priority, the
prevention of waste electrical and electronic equipment (WEEE), and in addition,
the reuse, recycling and other forms of recovery of such wastes so as to reduce
the disposal of waste. It also seeks to improve the environmental performance of
all operators involved in the life cycle of electrical and electronic equipment.
Compliance of the product with European CE directives.
Before switching the device on
Check the following before switching on the device:
Nominal voltage,
Supply voltage,
Nominal frequency,
Voltage ratio and phase sequence,
Current transformer ratio and terminals integrity,
Protection fuse for voltage inputs (recommended maximal external fuse size is 6 A),
Proper connection and voltage level of I/O modules.
Important: A current transformer secondary should be short circuited before connecting the device.
WARNING
A current transformer secondary should be short circuited before connecting the transducer.

SECURITY ADVICE AND WARNINGS
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User's Manual iMT440 Measuring transducer
Device switch-of Warning
Auxiliary supply circuits for (external) relays can include capacitors between supply and ground. In order to prevent
electrical shock hazard, the capacitors should be discharged via external terminals after having completely
disconnected auxiliary supply (both poles of any DC supply).
Disposal
It is strongly recommended that electrical and electronic equipment is not deposit as municipal waste. The
manufacturer or provider shall take waste electrical and electronic equipment free of charge. The complete procedure
after lifetime should comply with the Directive 2002/96/EC about restriction on the use of certain hazardous
substances in electrical and electronic equipment.

BASIC DESCRIPTION AND OPERATION
User's Manual iMT440 Measuring transducer
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BASIC DESCRIPTION AND OPERATION
The following chapter presents basic information about measuring transducers, required to understand its purpose,
applicability and basic features connected to its operation.
Besides that, this chapter contains navigational tips, description of used symbols and other useful information for
understandable navigation through this manual.
Regarding the options of a measuring transducer, different chapters should be considered since it might vary in
functionality and design. More detailed description of device functions is given in chapter Main Features, supported
options and functionality.
Measuring instrument is available in housing for DIN rail mounting. Specifications of housing and DIN rail type are
specified in chapter Dimensions.
Contents
Contents and size of a packaging box can slightly vary depending on type of consignment.
Single device shipment or a very small quantity of devices is shipped in a larger cardboard box, which offers better
physical protection during transport.
This type of contents contains:
Measuring instrument
Fixation screws
CD with full version of this document, installation of setting software MiQen, required drivers for -USB (if
device is equipped with USB communication)
Short installation manual
When larger amount of devices is sent they are shipped in a smaller cardboard box for saving space and thus reducing
shipment costs. This type of contents contains:
Measuring instrument
Fixation screws
Short installation manual
This document and settings software MiQen can also be found on our web page www.iskra.eu.
CAUTION
Please examine the equipment carefully for potential damages which might arise during transport!
Description
Measuring transducer is intended for measuring, analysing and monitoring single-phase or three-phase electrical
power network. It measures RMS value by means of fast sampling of voltage and current signals, which makes
instrument suitable for acquisition of transient events.

BASIC DESCRIPTION AND OPERATION
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User's Manual iMT440 Measuring transducer
Appearance
Measuring transducer can differ from yours depending on the type and functionality.
iMT440
1 –Auxiliary supply
2 –I/O modules
3 –Communication ports
4 –Voltage inputs
5 –Current inputs
6 –Power ON LED
Communication ports and LED indicators
Serial communication can be connected by using screw-in connector (RS232 or RS485). USB can be connected through
USB-mini type connector at the bottom of transducer.
LED indicator is intended for POWER ON signalling (red LED).
WARNING
USB communication port is provided with only BASIC insulation and can ONLY be used unconnected to aux. supply
AND power inputs!

BASIC DESCRIPTION AND OPERATION
User's Manual iMT440 Measuring transducer
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I/O modules
Four I/O module slots are intended for various I/O modules, which should be chosen at placing the order. Analogue
outputs, fast analogue outputs, relay outputs (alarm, general-purpose digital outputs) and solid-state relay outputs
(alarm, general-purpose digital outputs).
Universal auxiliary supply
Auxiliary supply is connected by two screw-in connectors. For safety purposes it is important that all wires are firmly
fastened. Auxiliary supply is wide range (20 VDC –300 VDC; 48 VAC –276 VAC).
Voltage inputs
Each voltage input is connected to measuring circuit through input resistor chain (3.3 MΩper phase). Maximum value
of input voltage is 600 VL-N (1000 VL-L).
Current inputs
Each current input is connected to measuring circuit through current transformer (0.01 Ω per phase). Maximum
allowed thermal value of input current is 15 A (cont.).
Abbreviation/Glossary
Abbreviations are explained within the text where they appear the first time. Most common abbreviations and
expressions are explained in the following table:
Term
Explanation
RMS
Root Mean Square value
MODBUS
Industrial protocol for data transmission
MiQen
Setting Software for ISKRA d.o.o. instruments
AC
Alternating voltage
PA total
Angle calculated from total active and apparent power
PA1, PA2, PA3
Angle between fundamental phase voltage and phase current
PF
Power factor
THD
Total harmonic distortion
MD
Measurement of average values in time interval
Mv–Sample factor
Defines a number of periods for measuring calculation on the basis of measured frequency
Mp− Average interval
Defines frequency of refreshing displayed measurements
Hysteresis [%]
Percentage specifies increase or decrease of a measurement from a certain limit after
exceeding it.
PO
Pulse output module
RO
Relay output module
AL
Alarm output module
AO
Analogue output module
FAO
Fast analogue output module
DO
Digital output module
List of common abbreviations and expressions

BASIC DESCRIPTION AND OPERATION
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User's Manual iMT440 Measuring transducer
Purpose and use of different type of measuring transducer
PLEASE NOTE
Described in chapter below are main differences between different types of measuring transducers. Please note that
in flowing chapters, these differences may not be specifically pointed out.
Multifunctional transducer iMT440
iMT440 Multifunctional transducer is intended for measuring and monitoring single-phase or three-phase electrical
power network. iMT440 measures true RMS value by means of fast sampling of voltage and current signals, which
makes instruments suitable for acquisition of transient events. A built-in microcontroller calculates measurements
(voltage, current, frequency, energy, power, power factor, THD phase angles, etc.) from the measured signals.
Type differences
Different types differ on functionality and equipment as shown in the following table.
Differences in hardware
Feature
iMT440
Real time clock (RTC) with battery
●
Communication interface
USB / USB + RS232 / USB + RS485
●/○/○
I/O 1
AO / FAO / PO / RO
○/○/○/○
I/O 2
AO / FAO / PO / RO
○/○/○/○
I/O 3
AO / FAO / PO / RO
○/○/○/○
I/O 4
AO / FAO / PO / RO
○/○/○/○
Automatic voltage / current range
●/●
Universal power supply
○
Fixed AC power supply
63.5 / 110 / 230 / 240 / 400 V
○/○/○/○/○
● –serial ○ –option × − not supported
AO-analogue out, FAO-fast analogue out, PO-pulse out, RO-relay out
Software functions
Functions
iMT440
MODBUS protocol
●
Programmable alarms
32
Alarms recording
×
Measurements recording
×
● –serial × − not supported

BASIC DESCRIPTION AND OPERATION
User's Manual iMT440 Measuring transducer
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Supported measurements
Basic measurements
iMT440
Phase
Voltage U1, U2, U3and U~
●
Current I1, I2, I3, In, Itand Ia
●
Active power P1, P2, P3, and Pt
●
Reactive power Q1, Q2, Q3, and Qt
●
Apparent power S1, S2, S3, and St
●
Power factor PF1, PF2, PF3and PF~
●
Power angle φ1, φ2, φ3and φ~
●
THD of phase voltage Uf1, Uf2 and Uf3
●
THD of power angle I1, I2and I3
●
Voltage harmonics 1 - 31
●
Current harmonics 1 - 31
●
Phase-to-phase
Phase-to-phase voltage U12, U23, U31
●
Average phase-to-phase voltage Uff
●
Phase-to-phase angle φ12, φ23, φ31
●
THD of phase−to−phase voltage
●
Harmonics in phase-to-phase voltage 1 - 31
●
Energy
Counter 1
●
Counter 2
●
Counter 3
●
Counter 4
●
Active tariff
●
MD values
Phase current I1, I2, I3
●
Active power P (Positive)
●
Active power P (Negative)
●
Reactive power Q − L
●
Reactive power Q − C
●
Apparent power S
●
Other measurements
Measurement
Frequency
●
Internal temperature
●
● –serial × − not supported

CONNECTION
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User's Manual iMT440 Measuring transducer
CONNECTION
This chapter deals with the instructions for measuring instrument connection. Both the use and connection of the
device includes handling with dangerous currents and voltages. Connection shall therefore be performed ONLY a by a
qualified person using an appropriate equipment. ISKRA d.o.o. does not take any responsibility regarding the use and
connection. If any doubt occurs regarding connection and use in the system which device is intended for, please
contact a person who is responsible for such installations.
A person qualified for installation and connection of a device should be familiar with all necessary precaution
measures described in this document prior to its connection.
Before use please check the following:
Nominal voltage (UP-Pmax = 1000 VACrms; UP-Nmax = 600 VACrms),
Supply voltage,
Nominal frequency,
Voltage ratio and phase sequence,
Current transformer ratio and terminals integrity,
Protection fuse for voltage inputs (recommended maximal external fuse size is 6 A),
Proper connection and voltage level of I/O modules.
WARNING
Wrong or incomplete connection of voltage or other terminals can cause non-operation or damage to the device.
CAUTION
Aux. Supply inrush current can be as high as 20 A for short period of time (<1 ms). Please choose an appropriate MCB
for disconnection of aux. Supply.
PLEASE NOTE
After connection, settings have to be performed via communication (connection mode, current and voltage
transformers ratio …).

CONNECTION
User's Manual iMT440 Measuring transducer
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Mounting
iMT4xx measuring transducer is designed for DIN rail mounting. It should be mounted on a 35 mm DIN rail by means
of two plastic fasteners. Before installation fasteners should be in open position (pulled). After device is on place,
fasteners are locked (pushed) to close position.
Electrical connection
Voltage inputs of measuring transducer can be connected directly to low-voltage network or via appropriate voltage
measuring transformer to medium or high voltage network.
Current inputs of measuring transducer can be connected directly to low-voltage network or via a corresponding
current transformer.
Choose corresponding connection from the figures below and connect corresponding voltages and currents.
Information on electrical characteristics is given in chapter Inputs page 366.
WARNING
Before using tool for accessing interior or any other part of the transducer which in normal use may be hazardous live
(aux. supply and measuring input terminals), transducer MUST BE ISOLATED OR DISCONNECTED from hazardous live
voltage.
PLEASE NOTE
For proper connection wire diameters and other wiring requirements see chapter Connection.
Multifunctional transducer iMT440
System/connection
Terminal assignment
Connection 1b (1W)
Single phase connection

CONNECTION
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User's Manual iMT440 Measuring transducer
System/connection
Terminal assignment
Connection 3b (1W3b)
Three phase, three wire connection with
balanced load
Connection 3u (2W3u)
Three phase, three wire connection with
unbalanced load
Connection 4b (1W4b)
Three phase, four wire connection with balanced
load
Connection 4u (3W4u)
Three phase, four wire connection with
unbalanced load

CONNECTION
User's Manual iMT440 Measuring transducer
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Connection of input/output modules
WARNING
Check the module features that are specified on the label, before connecting module contacts. Wrong connection can
cause damage or destruction of module and/or device.
Connect module contacts as specified on the label. Examples of labels are given below and describe modules built in
the device. Information on electrical properties of modules is given in chapter Modules.
Electromechanical relay output module. (Example of alarm module as I/O module 1)
Solid-state relay module output. (Example of pulse module as I/O module 1)
Analogue output module with analogue output, proportional to measured quantities.
The outputs may be either short or open-circuited. They are electrically insulated
from each other and from all other circuits. (Example of analogue output module as
I/O module 1)
Fast analogue output module with analogue output, proportional to measured
quantities. The outputs may be either short or open-circuited. They are electrically
insulated from each other and from all other circuits. (Example of analogue output
module as I/O module 1)
Communication connection
Both voltage and current transducers have one isolated communication port, which can be equipped with RS232 or
RS485 or left open (to be specified with order). Additionally, iMT4xx measuring transducer has a USB communication
port, located on the bottom under small circular plastic cover. It is intended for settings ONLY and requires NO
auxiliary power supply. When connected to this communication port transducer is powered by USB.
WARNING
USB communication port is provided with only BASIC insulation and can ONLY be used unconnected to aux. supply and
power inputs!
Connect a communication line by means of corresponding terminals. Connection information is stated on the
instrument label. Connector terminals are marked on the label on the upper side of the instrument.
USB connector is positioned on the bottom side of an instrument under removable plastic cover. For driver installation
see Note on the next page. Instrument will establish USB connection with PC approx. 3 seconds after physical
connection to USB port.
More detailed information about communication is given in chapter Communication.
COM1 serial communication port (RS232)
COM1 serial communication port (RS485)

CONNECTION
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User's Manual iMT440 Measuring transducer
SERVICE communication port (USB)
RS232
RS232 communication is intended for direct connection of the Device to the personal computer. For proper operation
it is necessary to assure the corresponding connection of individual terminals (see table: Survey of communication
connection).
RS485
RS485 communication is intended for connection of multiple devices to a network where devices with RS485
communication are connected to a common communication interface. We suggest using one of the ISKRA d.o.o.
communication interfaces!
For proper operation it is necessary to assure the corresponding connection of individual terminals (see table: Survey
of communication connection).
USB
Additionally, there is a USB communication port, located on the bottom under small circular plastic cover. It is
intended for settings ONLY and requires NO auxiliary power supply. When connected to this communication port
iMT4xx measuring transducer is powered by USB.