Iskra MT416 User manual

User’s Manual
1
Programmable AC Voltage Transducer MT416
Programmable AC Current Transducer MT418
September 2020 • Version 3.00

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User’s Manual
Title
User and Installation manual

User’s Manual
iii
Security Advices 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 transducers.
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
This booklet contains instructions for installation and use of measuring transducer. Installation
and use of a device also includes handling with dangerous currents and voltages therefore should
be installed, operated, serviced and maintained by qualified personnel only. ISKRA d.o.o. assumes
no responsibility in connection with installation and use of the product. 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.
Beforeswitchingthedevice ON
Check the following before switching on the device:
Nominal voltage.
Proper connection of auxiliary supply.
Nominal frequency.
Voltage ratio and phase sequence.
Current transformer ratio and terminals integrity.
Protection fuse - recommended maximal external fuse size is 6 A.
Integrity and proper connection of analogue output.
Important: A current transformer secondary should be short circuited before connecting the meter.

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User’s Manual
Used symbols on devices’ housing
and labels
SYMBOL
EXPLANATION
WARNING
Indicates situations where careful reading of this manual is required and following
requested steps to avoid potential injury is advised.
Double insulation in compliance with the SIST EN 61010−1 standard.
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.
Important: A current transformer secondary should be short circuited before connecting the
transducer.
Disposal
It is strongly recommended that electrical and electronic equipment (WEEE) is not deposit as municipal
waste. The manufacturer or provider shall take waste electrical and electronic equipment freeof 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
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Table of contents
1BASIC DESCRIPTION AND OPERATION 1
INTRODUCTION 2
DESCRIPTION OF THE DEVICE 3
PURPOSE AND USE OF DIFFERENT TYPES OF MEASURING TRANSDUCERS 4
2CONNECTION 5
INTRODUCTION 6
MOUNTING 6
ELECTRICAL CONNECTION 6
COMMUNICATION CONNECTION 7
CONNECTION OF AUXILIARY POWER SUPPLY 8
3SETTINGS 9
INTRODUCTION 10
MIQEN SOFTWARE 10
SETTING PROCEDURE 11
GENERAL SETTINGS 11
SERIAL COMMUNICATION (COM1) 12
SECURITY 12
INPUTS AND OUTPUTS 14
4MEASUREMENTS 16
EXPLANATION OF BASIC CONCEPTS 17
CALCULATION AND DISPLAY OF MEASUREMENTS 17
PRESENT VALUES 17
6TECHNICAL DATA 18
APPLIED STANDARDS 19
ACCURACY 19
MECHANICAL CHARACTERISTICS OF INPUT 20
ELECTRICAL CHARACTERISTICS OF INPUT 20
CONNECTION 21
ANALOGUE OUTPUT 21
COMMUNICATION 22
ELECTRONIC FEATURES 22
SAFETY FEATURES 23
DIMENSIONS 24

BASIC DESCRIPTION AND OPERATION
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7ABBREVIATION/GLOSSARY 25
8APPENDICES 26
APPENDIX A: MODBUS COMMUNICATION PROTOCOL 26
APPENDIX C: CALCULATIONS &EQUATIONS 29

BASIC DESCRIPTION AND OPERATION
User’s Manual
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1BASIC DESCRIPTION AND OPERATION
The following chapter presents basic information about multifunction transducers required to
understand its purpose, applicability and basic features connected to its operation.
In this chapter you will find:
INTRODUCTION 2
DESCRIPTION OF THE DEVICE 3
PURPOSE AND USE OF DIFFERENT TYPES OF MEASURING TRANSDUCERS 4

BASIC DESCRIPTION AND OPERATION
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User’s Manual
Introduction
MT416 and MT418 are programmable AC voltage / current transducers with minimal differences in
functionality. Where there are some characteristic features that denote MT416 or MT418 symbol next
to data.
1.1.1 Description of symbols
Subchapter
Symbols next to the subchapters indicate accessibility of functions described. Accessibility of functions
is indicated with the following symbols:
−Function accessible via communication (MiQen software).
PLEASE NOTE
For unknown technical terms please refer to Glossary on the next page.
USER INFORMATION
For unknown technical terms please refer to Glossary at the end of the document.

BASIC DESCRIPTION AND OPERATION
User’s Manual
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Description of the device
Programmable AC measuring transducer is intended for measuring, analyzing and monitoring single-
phase voltage or current. Also frequency measurement of voltage or current signal is supported. It
measures TRMS values by means of fast sampling of voltage and current signals, which makes
instrument suitable for acquisition of transient events. A built-in microcontroller calculates
measurements (voltage, current, frequency, THD, MD) from the measured signals.
1.2.1 Appearance
Measuring transducer can differ from yours depending on the type and functionality.
1 –Analogue output
2 –Auxiliary supply
3 –Voltage/Current/Frequency input
4 –Communication port
5 –LED indicator
Communication ports and LED indicators
Serial communication (RS485 or RS232) is connected with screw-in connector.
USB can be connected through mini USB-B type connector at the bottom of housing behind removable
cap. IT IS INTENTED ONLY FOR QUICK SETUP BY MIQEN SOFTWARE PRIOR INSTALLING THE
INSTRUMENT.
LED indicator is intended for POWER ON signalling (red symbol on the front panel).
Analogue output
Analogue output is connected through screw-in connectors. Features sophisticated 2 voltage and 4
current ranges, possible user defined non-linear characteristics.
Auxiliary supply
Auxiliary supply is connected through screw-in connectors. For safety purposes it is important that both
wires are firmly connected. Auxiliary supply can be either Universal (24 VDC –300 VDC; 40 VAC –276
VAC) or Transformer (110, 230 VAC), which should be chosen at placing the order.
Voltage inputs
Voltage input is c
Maximum value of input voltage is 600 VL-N.
Current inputs
thermal value of input current is 15 A (cont.).

BASIC DESCRIPTION AND OPERATION
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User’s Manual
Purpose and use of different types of measuring
transducers
1.3.1 Programmable AC Voltage transducer MT416
MT416 is intended for measuring and monitoring single-phase voltage or frequency. Voltage input is
electrically insulated from the system by means of voltage transformer. It measures TRMS voltage value
by means of fast sampling of voltage signals, which makes instruments suitable for acquisition of
transient events. A built-in microcontroller calculates measurands (voltage, frequency) from the
measured signals. Measurands can be then converted into load independent DC current or voltage
which is proportional to the TRMS measured value for the purpose of regulation of analogue and/or
digital devices.
1.3.2 Programmable AC Current transducer MT418
MT418 is intended for measuring and monitoring single-phase current or frequency. Input current is
electrically insulated from the system by means of current transformer. MT418 measures TRMS current
value by means of fast sampling of current signals, which makes instruments suitable for acquisition of
transient events. A built-in microcontroller calculates measurands (current, frequency) from the
measured signals. Measurands can be then converted into load independent DC current or voltage
which is proportional to the TRMS measured value for the purpose of regulation of analogue and/or
digital devices.

CONNECTION
User’s Manual
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2CONNECTION
This chapter deals with the instructions for measuring transducer connection. Both the use and
connection of the device includes handling with dangerous currents and voltages. Only a qualified
person shall therefore perform connection. 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.
In this chapter you will find:
INTRODUCTION 6
MOUNTING 6
ELECTRICAL CONNECTION 6
COMMUNICATION CONNECTION 7
CONNECTION OF AUXILIARY POWER SUPPLY 8

CONNECTION
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User’s Manual
Introduction
Before use: Check voltages, supply voltage and nominal frequency.
A circuit breaker with current rating of at least 1A shall be included in close proximity with aux. supply
installation as a means of disconnection. It shall be properly marked.
WARNING!
Wrong or incomplete connection of voltage, protective ground or other terminals can cause
malfunction or damage the device.
PLEASE NOTE
After connection, settings have to be performed via communication or remote display
(connection mode, current and voltage transformers ratio, etc.).
Mounting
(MT416/418 Programmable AC measuring transducer is designed for panel mounting. It should be
mounted on a 35 mm DIN rail by means of one plastic fastener. Before installation fastener should be
in open position (pulled). After device is on place, fastener is locked (pushed) to close position.
Electrical connection
Voltage inputs of programmable AC 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 programmable AC 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.
System/connection
Terminal assignment
MT416
Voltage measurement
MT418
Current measurement

CONNECTION
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Communication connection
MT416/418 has one galvanic separated communication port, which can be equipped with RS232 or
RS485 or left open (to be specified with order).
Different configurations are possible (to be specified with an order):
Configuration
COM
WO
USB (1)
RS232
RS232 + USB (1)
RS485
RS485 + USB (1)
(1) AUXILARY USB PORT IS NOT GALVANIC SEPARATED FROM ANALOGUE OUTPUT, THUS IT IS
INTENTED ONLY FOR QUICK SETUP BY MIQEN SOFTWARE PRIOR INSTALLING THE INSTRUMENT.
USB connector is placed on the bottom of the MT416/418, behind removable cap. After installation it is
not accessible any more. When connected, MT416/418 is powered by USB port.
Connect a communication line by means of a corresponding terminal. Corresponding data are stated on
the instrument label, regarding the selected communication. Connector terminals are marked on the
label on the upper side of the instrument.
2.4.1 RS232
RS232 communication is intended for direct connection of the programmable AC measuring transducer
to the personal computer. Check the sticker on top of the instrument for correct connection of
terminals.
2.4.2 RS485
RS485 communication is intended for connection of devices to network where several instruments with
RS485 communication are connected to a common communication interface. We recommend the use
of Iskra d.o.o. communication interfaces for best compatibility! Check the sticker on top of the
instrument for correct connection of terminals.
2.4.3 USB
USB communication serves as a fast peer-to-terminal data link. The instrument is detected by host as a
USB 2.0 compatible device. The USB connection is provided through a USB standard mini type B
connector.
PLEASE NOTE
When MT416/418 is connected to a PC through USB communication for the first time, a user
is prompted to install a driver. The driver can be downloaded from the Iskra d.o.o. web page
https://www.iskra.eu/en/. With this driver installed, USB is redirected to a serial port, which
should be selected when using MiQen software.

CONNECTION
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User’s Manual
Connection of auxiliary power supply
Programmable AC measuring transducer has universal (AC/DC) auxiliary power supply. Information on
electric consumption is given in chapter Technical data on page 22. Auxiliary supply is connected
through two screw-in connectors. Universal (24 VDC –300 VDC; 40 VAC –276 VAC) or Transformer (110,
230 VAC), which should be chosen at placing the order.
According to power supply voltage specification on the label, choose and connect the power supply
voltage:
Connection of universal power supply to
terminals 13 and 14
Connection of transformer 110 V power supply
(terminals 13 and 14)
Connection of transformer 230 V power supply
(terminals 13 and 14)
WARNING!
For safety purposes it is important that all three wires (Line, Neutral and Protective Earth) are
firmly connected. They should be connected only to the designated terminals as shown on the
label above as well as on the front foil.
Function
Connection
Measuring input:
AC current
1/3
MT 418
AC voltage
2/11
MT 416
Analogue output:
15
–
16
Auxiliary power supply:
+ / AC
13
–/ AC
14
Communication:
RS232/485
Rx / A
21
GND / C
22
Tx / B
23

SETTINGS
User’s Manual
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3SETTINGS
A setting structure, which is similar to a file structure in an explorer is displayed in the left part of the
MiQen setting window. Available settings of that segment are displayed in the right part by clicking any
of the stated parameters.
In this chapter you will find detailed description of all Multifunction tranduscers features and settings.
Chapter is organized in a way to follow settings organisation as in setting software MiQen.
INTRODUCTION 10
MIQEN SOFTWARE 10
SETTING PROCEDURE 11
GENERAL SETTINGS 11
SERIAL COMMUNICATION (COM1) 12
SECURITY 12
INPUTS AND OUTPUTS 14

SETTINGS
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User’s Manual
Introduction
Instrument settings can be remotely modified with communication (COM1) and MiQen software, when
connected to a PC.
MiQen software
MiQen software is a tool for a complete programming and monitoring of ISKRA measuring instruments,
connected to a PC via serial communication or USB communication. A user-friendly interface consists of
five segments: devices management, instrument settings, real-time measurements, data analysis and
software upgrading.
A user-friendly interface of MiQen consists of five segments: devices management (Connection),
instrument settings (Settings), real-time measurements (Measurements), data analysis (Analysis), and
software upgrading (Upgrades). These segments are easily accessed by means of five icons on the left
side.
DEVICES MANAGEMENT
Select the instrument in a favourite’s line. Use the network explorer to set and explore the devices
network. Communication parameters of all devices and their addresses in network can be easily set.
INSTRUMENT SETTINGS
Multi Register Edit technology assures a simple modification of settings that are organized in a tree
structure. Besides transferring settings into the instrument, storing and reading from the setting files is
also available.
REAL-TIME MEASUREMENTS
All supported measurements can be captured in real time in a table form. Harmonics and their time-
reconstructed signals are displayed also graphically. For further processing of the results of
measurements, copying via a clipboard into standard Windows formats is supported.
DATA ANALYSIS
Not supported with this instrument.

SETTINGS
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SOFTWARE UPGRADING
Always use the latest version of software, both MiQen and software in the instrument. The program
automatically informs you on available upgrades that can be transferred from the web site and used for
upgrading.
PLEASE NOTE
More information about MiQen software can be found in MiQen Help system!
You can download freeware MiQen (standard edition) from: www.iskra.eu
Setting procedure
In order to modify instrument settings with MiQen, current parameters must be loaded first. Instrument
settings can be acquired via a communication link (serial or USB) or can be loaded off-line from a file on
a local disk. Settings are displayed in the MiQen Setting Window - the left part displays a hierarchical
tree structure of settings, the right part displays parameter values of the chosen setting group.
General settings
General settings are essential for programmable AC measuring transducer. They are divided into four
additional sublevels (Connection, Communication and Security).
3.4.1 Description and Location
Two parameters that are intended for easier recognition of a certain unit. They are especially used for
identification of the device or location on which measurements are performed.
3.4.2 Average interval
The averaging interval defines the refresh rate of measurements on communication.
3.4.3 Maximum demand calculation (MD mode, MT418)
The instrument provides maximum demand values from a thermal function demand values.
A thermal function assures exponent thermal characteristic based on simulation of bimetal meters.
Maximal values and time of their occurrence are stored in device. A time constant (t. c.) can be set from
1 to 255 minutes and is 6 − time thermal time constant (t. c. = 6 * thermal time constant).
Example:
Mode: Thermal function
Time constant: 8 min.
Present MD and MD peak: Reset at 0 min.
Thermal function
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Time [min.]
Measured value
Present MD MD peak Input
Time const.

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Serial Communication (COM1)
3.5.1 Communication parameters
They define parameters that are important for the operation in RS485 network or connections with PC
via RS232 communication. Factory settings of communication are #33\115200,n,8,2 (address 1 to
247\rate 2400 to 115200 b/s, parity, data bits, stop bit).
3.5.2 USB Communication
USB communication connects directly to the CPU, thus no serial settings are needed (firmware at least
V1.17).
Security
Settings parameters are divided into four groups regarding security level:
1. At the first level (PL1), settings of a real time clock can be changed, and energy meters and
MD can be reset.
2. At the second level (PL2), the access to all data that are protected with the first level (PL1) and
setting of all other parameters in the »SETTINGS« menu are available.
3. A backup password (BP) is used if passwords at levels 1 (PL1) and 2 (PL2) have been forgotten,
and it is different for each device (depending on a serial number of the meter). The BP
password is available in the user support department in ISKRA D.O.O., and is entered instead
of the password PL1 or/and PL2. Do not forget to state the meter serial meter when contacting
the personnel in Iskra d.o.o..
PLEASE NOTE
A serial number of device is stated on the label and also accessible with MiQen software.

SETTINGS
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3.6.1 Password setting
A password consists of four letters taken from the British alphabet from A to Z. When setting a
password, only the letter being set is visible while the others are covered with *.
Two passwords (PL1, PL2) and the time of automatic activation could be set.
Password modification
A password can be modified; however, only that password can be modified to which the access is
unlocked at the moment.
Password disabling
A password is disabled by setting the "AAAA" password.
PLEASE NOTE
A factory set password is "AAAA" at both access levels (L1 and L2). This password does not
limit access.
Password and language
Language change is possible without password input. When language is changed from or to Russian,
character transformation has to be taken in to account. Character transformation table (English or
Russian alphabet) is stated below.
English
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
Russian
А
Б
В
Г
Д
Е
Ж
З
И
Й
К
Л
М
Н
O
П
P
С
Т
У
Ф
Х
Ц
Ч
Ш
Щ

SETTINGS
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User’s Manual
Inputs and outputs
Module settings depend on built-in modules.
3.7.1 Analogue output module
Unipolar analogue output is fully programmable and can be set to any of 6 ranges.
Output parameter
Set the measured parameter to be transformed onto the analogue output.
Output range
Defines analogue output full-scale ranges:
DC current output
DC voltage output
0…1 mA
0…1 V
0…5 mA
0...10 mA
0…10 V
0...20 mA
Output signal
Defines the shape and up to 5 break points of an analogue output. For intrinsic-error for analogue
output with bent or linear zoom characteristic multiply accuracy class with correction factor (c).
Correction factor c (the highest value applies):
Linear characteristic
Bent characteristic
1
1
1
0
0



cor
x
x
y
y
c
e
e
bb xxx  1
b –number of break points (1 to 5)
1
1
1




cor
y
x
xx yy
c
e
e
bb
bb