Iskra MT416 User manual

Programmable AC Voltage
Transducer MT416
Programmable AC Current
Transducer MT418
March 2019 • Version 2.00

Table of contents
User’s Manual ii
Table of Contents
1. SECURITY ADVICE AND WARNINGS________________________________________1
1.1 Welcome--------------------------------------------------------------------------------------------- 2
1.2 Introduction----------------------------------------------------------------------------------------- 2
1.3 Health and safety----------------------------------------------------------------------------------- 2
1.4 Safety warnings and instructions for use-------------------------------------------------------- 2
1.5 Warnings, information and notes regarding designation of the product ------------------- 3
2. BASIC DESCRIPTION AND OPERATION OF PROGRAMMABLE AC MEASURING
TRANSDUCER___________________________________________________________4
2.1 Introduction----------------------------------------------------------------------------------------- 5
2.2 Glossary --------------------------------------------------------------------------------------------- 5
2.3 Description of the product ------------------------------------------------------------------------ 6
2.4 Purpose and use of programmable AC measuring transducer------------------------------- 7
3. CONNECTION___________________________________________________________8
3.1 Introduction----------------------------------------------------------------------------------------- 9
3.2 Mounting -------------------------------------------------------------------------------------------- 9
3.3 Electric connection--------------------------------------------------------------------------------- 9
3.4 Communication connection----------------------------------------------------------------------10
3.5 Connection of auxiliary power supply----------------------------------------------------------11
4. SETTINGS _____________________________________________________________13
4.1 Introduction----------------------------------------------------------------------------------------14
4.2 MiQen software------------------------------------------------------------------------------------14
4.3 Setting procedure----------------------------------------------------------------------------------15
4.4 General settings -----------------------------------------------------------------------------------15
4.5 Serial communication-----------------------------------------------------------------------------16
4.6 Security ---------------------------------------------------------------------------------------------17
4.7 Analogue output -------------------------------------------------------------------------------18
5. MEASUREMENTS_______________________________________________________20
5.1 Introduction----------------------------------------------------------------------------------------21
5.2 Explanation of basic concepts-------------------------------------------------------------------21
5.3 Calculation and display of measurements -----------------------------------------------------21
5.4 Present values -------------------------------------------------------------------------------------21
6. TECHNICAL DATA ______________________________________________________22
6.1 Applied standards ---------------------------------------------------------------------------------23
6.2 Accuracy--------------------------------------------------------------------------------------------24
6.3 Inputs -----------------------------------------------------------------------------------------------25
6.4 Connection -----------------------------------------------------------------------------------------25
6.5 Analogue output-----------------------------------------------------------------------------------26
6.6 Communication------------------------------------------------------------------------------------26
6.7 Electronic features --------------------------------------------------------------------------------27
6.8 Safety features -------------------------------------------------------------------------------------27
6.9 Mechanical-----------------------------------------------------------------------------------------27
6.10 Environmental conditions ----------------------------------------------------------------------27
6.11 Reference conditions ----------------------------------------------------------------------------28

Kazalo
User’s Manuliii
6.12 Dimensions ---------------------------------------------------------------------------------------28
7. APPENDIX A: MODBUS PROTOCOL _______________________________________29
7.1 Modbus communication protocol ---------------------------------------------------------------30
8. APPENDIX B: CALCULATIONS & EQUATIONS ______________________________33
8.1 Calculations----------------------------------------------------------------------------------------34
8.2 Equations-------------------------------------------------------------------------------------------34

Security advice and warnings
User’s Manual 1
1. SECURITY ADVICE AND WARNINGS
1.1 Welcome--------------------------------------------------------------------------------------------- 2
1.2 Introduction----------------------------------------------------------------------------------------- 2
1.3 Health and safety----------------------------------------------------------------------------------- 2
1.4 Safety warnings and instructions for use-------------------------------------------------------- 2
1.5 Warnings, information and notes regarding designation of the product ------------------- 3

Security advice and warnings
2User’s Manual
1.1 Welcome
Please read this chapter carefully before starting work with a programmable AC measuring
transducer.
This chapter deals with important information and warnings that should be considered for safe
handling with a programmable AC measuring transducer.
1.2 Introduction
This booklet contains instructions for installation and use of programmable AC measuring
transducers MT416/418. Installation and use of devices also includes handling with dangerous
currents and voltages and shall therefore be carried out by qualified persons. The Iskra MIS
Company 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 instrument is used for
measuring or supervision, please contact a person who is responsible for installation of such
system.
1.3 Health and safety
The purpose of this chapter is to provide a user with information concerning safe installation and
handling with the product in order to assure its correct use and continuous operation.
It is essential that everyone using the product is 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.
1.4 Safety warnings and instructions for use
Check the following before switching on the device:
Nominal voltage,
Proper connection and level of auxiliary supply,
Nominal frequency,
Voltage ratio,
Current transformer ratio and terminals integrity,
Protection fuse - recommended maximal external fuse size is 6 A,
Proper connection of analogue output.

Security advice and warnings
User’s Manul3
Important: A current transformer secondary should be short circuited before connecting the
meter.
Waste
It is forbidden to deposit electrical and electronic equipment 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
1.5 Warnings, information and notes regarding designation of the product
Used symbols:
See product documentation.
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.
Contents of consignment
The consignment includes:
− Programmable AC measuring transducer MT416/418
− Quick guide.

Basic description and operation of measuring transducer
4User’s Manual
2. BASIC DESCRIPTION AND OPERATION OF
PROGRAMMABLE AC MEASURING TRANSDUCER
2.1 Introduction----------------------------------------------------------------------------------------- 5
2.2 Glossary --------------------------------------------------------------------------------------------- 5
2.3 Description of the product ------------------------------------------------------------------------ 6
2.4 Purpose and use of programmable AC measuring transducer------------------------------- 6

Basic description and operation of measuring transducer
User’s Manul5
2.1 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.
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)
User information
For unknown technical terms please refer to Glossary on the next page.
2.2 Glossary
Term
Explanation
RMS
Root Mean Square value
MODBUS
Industrial protocol for data transmission
MiQen
Software for Iskra MIS instruments
AC
Alternating voltage, current
DC
Direct voltage, current
THD
Total harmonic distortion
MD
Measurement of average values in time interval (Maximum
Demand)
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 on
the basis of a Sample factor
Hysteresis expressed as percentage
[%]
Percentage specifies increase or decrease of a measurement
from a certain limit after exceeding it.

Basic description and operation of measuring transducer
6User’s Manual
2.3 Description of the product
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 RMS 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.
Appearance
Programmable AC 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 port
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
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 input (MT416)
Voltage input is connected to measuring circuit through measuring voltage transformer (500k).
Maximum value of input voltage is 600 VL-N.
Current input (MT418)
Current input is connected to measuring circuit through current transformer (0.01). Maximum
allowed thermal value of input current is 15A (cont.).

Basic description and operation of measuring transducer
User’s Manul7
2.4 Purpose and use of programmable AC measuring transducer
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 RMS
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 RMS measured value for the purpose of
regulation of analogue and/or digital devices.
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 RMS 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 RMS measured value
for the purpose of regulation of analogue and/or digital devices.

Connection
8User’s Manual
3. CONNECTION
3.1 Introduction----------------------------------------------------------------------------------------- 9
3.2 Mounting -------------------------------------------------------------------------------------------- 9
3.3 Electric connection--------------------------------------------------------------------------------- 9
3.4 Communication connection----------------------------------------------------------------------10
3.5 Connection of auxiliary power supply----------------------------------------------------------11

Connection
User’s Manul9
3.1 Introduction
This chapter deals with the instructions for programmable AC 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 MIS 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.
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 supply, measurement or other
terminals can cause malfunction or damage the device.
Note
After connection, settings have to be performed via communication
(connection mode, current and voltage transformers ratio …).
3.2 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.
3.3 Electric 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 on page 25.

Connection
10 User’s Manual
System/ connection
Terminal assignment
MT416
Voltage measurement
MT418
Current measurement
3.4 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 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.

Connection
User’s Manul11
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.
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 MIS communication interfaces for best compatibility! Check the
sticker on top of the instrument for correct connection of terminals.
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.
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 MIS web page www.iskra-mis.si. With this
driver installed, USB is redirected to a serial port, which should be selected
when using MiQen software.
3.5 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)

Connection
12 User’s Manual
Warning!
For safety purposes it is important that both wires 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
I 
1/3
MT 418
AC voltage
U 
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 13
4. SETTINGS
4.1 Introduction----------------------------------------------------------------------------------------14
4.2 MiQen software------------------------------------------------------------------------------------14
4.3 Setting procedure----------------------------------------------------------------------------------15
4.4 General settings -----------------------------------------------------------------------------------15
Description and Location ............................................................................................................. 15
Average interval ........................................................................................................................... 15
Maximum demand calculation (MD mode), (MT418) ................................................................. 16
4.5 Serial communication-----------------------------------------------------------------------------16
Communication parameters .......................................................................................................... 16
4.6 Security ---------------------------------------------------------------------------------------------17
Password setting .......................................................................................................................... 17
Password modification ................................................................................................................. 17
Password disabling ...................................................................................................................... 17
Password and language...................................................................................................................... 17
4.7 Analogue output -------------------------------------------------------------------------------18
Reset maximal MD values (MT418), ........................................................................................... 19
Reset the last MD period (MT418), ............................................................................................. 19

Settings
14 User’s Manual
4.1 Introduction
Instrument settings can be remotely modified with communication (COM1 and/or USB if
available) and MiQen software when connected to a PC.
4.2 MiQen software
MiQen is a software tool for complete monitoring of measuring instruments, connected to a PC
via serial or USB communication. A user-friendly interface consists of five segments: devices
management, instrument settings, real-time measurements, data analysis and software upgrading.
Two editions of MiQen software are available:
Professional edition with full functionality and supports all software functionality. CD-Key
is required for the installation.
Standard edition, freeware edition which supports all software functionality except data
analysis.
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. 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.
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.
Note
More information about MiQen software can be found in MiQen Help
system!

Settings
User’s Manul15
MiQen user interface
Note
You can download freeware MiQen (standard edition) from: www.iskra-
mis.si
4.3 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.
4.4 General settings
General settings are essential for programmable AC measuring transducer. They are divided into
four additional sublevels (Connection, Communication and Security).
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.
Average interval
The averaging interval defines the refresh rate of measurements on communication.

Settings
16 User’s Manual
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
4.5 Serial communication
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).
USB communication connects directly to the CPU, thus no serial settings are needed.
(firmware at least V1.17)
Time const.