Measuring transducers MT 416, MT 418

Measuring transducers MT 416, MT 418
GB
User’s Manual
Programmable AC Voltage Transducer MT416
Programmable AC Current Transducer MT418
Table of contents 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 User’s Manual iii
Table of contents 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 iv User’s Manual Security advice and warnings
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 User’s Manual 1
Security advice and warnings
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:
2 •
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.
User’s Manual Security advice and warnings
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.
User’s Manual 3 Basic description and operation of measuring transducer
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 4 User’s Manual
Basic description and operation of measuring transducer
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
RMS
MODBUS
MiQen
AC
DC
THD
Explanation
Root Mean Square value
Industrial protocol for data transmission
Software for Iskra MIS instruments
Alternating voltage, current
Direct voltage, current
Total harmonic distortion
Measurement of average values in time interval (Maximum
MD
Demand)
Defines a number of periods for measuring calculation on the
Mv − Sample factor
basis of measured frequency
Defines frequency of refreshing displayed measurements on
Mp − Average interval
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.
User’s Manual 5 Basic description and operation of measuring transducer
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 (500kΩ).
Maximum value of input voltage is 600 VL-N.
Current input (MT418)
Current input is connected to measuring circuit through current transformer (0.01Ω). Maximum
allowed thermal value of input current is 15A (cont.).
6 User’s Manual Basic description and operation of measuring transducer
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.
User’s Manual 7 Connection
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 8 User’s Manual
Connection
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 lowvoltage 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 lowvoltage 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.
User’s Manual 9 Connection
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
WO
RS232
RS485
COM
USB (1)
RS232 + USB (1)
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.
10 User’s Manual Connection
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)
User’s Manual 11 Connection
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
Measuring input:
Connection
AC current
IE
1/3
MT 418
AC voltage
UE
2/11
MT 416
+D
15
–D
16
Analogue output:
Auxiliary power supply:
Communication:
12 RS232/485
+ / AC
13
– / AC
14
Rx / A
21
GND / C
22
Tx / B
23
User’s Manual Settings
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 User’s Manual 13 Settings
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!
14 User’s Manual Settings
MiQen user interface
Note
You can download freeware MiQen (standard edition) from: www.iskramis.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.
User’s Manual 15 Settings
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.
Measured value
Thermal function
Time const.
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20
Time [min.]
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)
16 User’s Manual Settings
4.6 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
MIS, 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 MIS.
User information
A serial number of device is stated on the label and also accessible with
MiQen software.
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.
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
User’s Manual 17 Settings
4.7 Analogue output
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
0 … 1 mA
0 … 5 mA
0 ... 10 mA
0 ... 20 mA
DC voltage output
0…1V
0 … 10 V
Output signal
Defines the shape and up to 5 break points of an analogue output. For intrinsic-error for analogue
outputs with bent or linear zoom characteristic multiply accuracy class with correction factor (c).
Correction factor c (the highest value applies):
Linear characteristic
Bent characteristic
y0
1−
ye
c=
x0
1−
xe
xb−1 ≤ x ≤ xb b – number of break points (1 to 5)
y − yb−1 xe
c= b
⋅
or c = 1
xb − xb−1 ye
18 or
c =1
User’s Manual Settings
Example of settings with linear and bent characteristic:
Average interval for analogue output
Defines the average interval for measurements on the analogue output. Available settings are
from 1 period (0.02 sec at 50Hz) up to 256 periods (5.12 sec at 50Hz).
Reset maximal MD values (MT418),
Current and stored MDs are reset.
Reset the last MD period (MT418),
Current MD value is reset.
User’s Manual 19 Measurements
5.
MEASUREMENTS
5.1 Introduction ---------------------------------------------------------------------------------------- 21 5.2 Explanation of basic concepts ------------------------------------------------------------------- 21 Sample factor − MV ............................................................................................................................... 21 Average interval − MP ........................................................................................................................... 21 5.3 Calculation and display of measurements ----------------------------------------------------- 21 5.4 Present values ------------------------------------------------------------------------------------- 21 Voltage
............................................................................................................................................. 21 Current .............................................................................................................................................. 21 Frequency
......................................................................................................................................... 21 MD values , (MT418) ....................................................................................................................... 21 THD − Total harmonic distortion
.................................................................................................... 21 20 User’s Manual
Measurements
5.1 Introduction
In the following chapters the device’s operation is explained more in detail.
5.2 Explanation of basic concepts
Sample factor − MV
A meter measures all primary quantities with the sample frequency of 6.991 kHz. The minimum
of 107 samples must be in the calculation period. Based on these limitations (65Hz·107 samples)
a sample factor is calculated. A sample factor (MV), depending on frequency of a measured
signal, defines a number of periods for a measurement calculation and thus a number of
harmonics considered in calculations.
Average interval − MP
Due to readability of measurements from communication, an Average interval (MP) is calculated
with regard to the measured signal frequency. The Average interval (see chapter Average interval
on page 15) defines refresh rate of displayed measurements based on a sampling factor.
5.3 Calculation and display of measurements
This chapter deals with capture, calculation and display of all supported quantities of
measurement. Detailed description with formulas is shown in chapter Equations on page 34.
5.4 Present values
Voltage
Instrument measures real effective (rms) value of phase voltage (U), connected to the meter.
Voltage measurement is available via communication.
Current
Instrument measures real effective (rms) value of phase currents, connected to current input.
Current measurement is available via communication.
Frequency
Network frequency is calculated from time periods of measured voltage.
MD values , (MT418)
Measurements of MD values.
THD − Total harmonic distortion
THD is calculated for phase currents, phase voltages and is expressed as percent of high
harmonic components relative to first harmonic.
Instrument uses measuring technique of real effective (rms) value that assures exact
measurements with the presence of high harmonics up to 53rd harmonic
User’s Manual 21 Technical data
6.
TECHNICAL DATA
6.1 Applied standards --------------------------------------------------------------------------------- 23 6.2 Accuracy -------------------------------------------------------------------------------------------- 24 6.3 Inputs ----------------------------------------------------------------------------------------------- 25 Voltage input.......................................................................................................................................... 25 Current input .......................................................................................................................................... 25 Frequency............................................................................................................................................... 25 Power supply ......................................................................................................................................... 25 6.4 Connection ----------------------------------------------------------------------------------------- 25 Permitted conductor cross-sections ....................................................................................................... 25 6.5 Analogue output ----------------------------------------------------------------------------------- 26 General ................................................................................................................................................... 26 DC Current output ................................................................................................................................. 26 DC Voltage output ................................................................................................................................. 26 6.6 Communication ------------------------------------------------------------------------------------ 26 6.7 Electronic features -------------------------------------------------------------------------------- 27 Response time ........................................................................................................................................ 27 Status LED’s .......................................................................................................................................... 27 6.8 Safety features ------------------------------------------------------------------------------------- 27 Protection ............................................................................................................................................... 27 6.9 Mechanical ----------------------------------------------------------------------------------------- 27 6.10 Environmental conditions ---------------------------------------------------------------------- 27 6.11 Dimensions --------------------------------------------------------------------------------------- 28 22 User’s Manual
Technical data
6.1 Applied standards
EN 61010-1: 2001, Safety requirements for electrical equipment for measurement, control and
laboratory use Part 1: General requirements
EN 60688:1992 Electrical measuring transducers for converting a.c. electrical quantities to
analogue or digital signals
EN 60688:1995 / A1: 1999 Electrical measuring transducers for converting a.c. electrical
quantities to analogue or digital signals
EN 60688:1995 / A2: 2001 Electrical measuring transducers for converting a.c. electrical
quantities to analogue or digital signals
EN 61326-1:2006, EMC requirements for electrical equipment for measurement, control and
laboratory use - Part 1: General requirements
User’s Manual 23 Technical data
6.2 Accuracy
Total accuracy (measurements and analogue output) according to EN 60688 is presented as
percentage of range of the measurand’s nominal value, except when it is stated as an absolute
value.
Measured values
Rms current I1
Maximum current
Rms voltage U1
Maximum voltage
Frequency (f) − actual
Nominal frequency range
THD
Range
1, 5,10 A
12 A
62.5, 125, 250, 500 V L-N
600 V L-N
50 / 60Hz
16 … 400 Hz***
5 … 500 V
0.1 10A
0 … 400 %
Accuracy class*
0.5 (0.3)**
0.5 (0.3)**
0.5 (0.3)**
0.5 (0.3)**
0.02
0.02
MT418
MT418
MT416
MT416
0.5
Note
*
− All measurements are calculated with high harmonic signals.
** − Measurements on communication.
*** − 16 Hz output possible only if Nominal frequency in Miqen
(Settings-General-Connection) set to 16 Hz
24 User’s Manual Technical data
6.3 Inputs
Voltage input
Nominal values
Rated voltage (UN)
Max. allowed value
Minimal measurement
Maximal measurement
Input impedance
Consumption
62.5, 125, 250, 500 VLN
500 VLN
1.2 × UN permanently, 2 × UN 10s
10 mV sinusoidal
600 VL-N
500 kΩ
U2 /500kΩ
Nominal values
Rated current (IN)
Max. allowed value
(thermal)
Min. measurement
Max. measurement
Consumption
1, 5, 10 A
5A
15 A continuous
20 × IN (5 × 1s)
2 mA sinusoidal
12 A sinusoidal
I2 × 0.01Ω
Nominal frequency range
Measuring range
50/60, 400 Hz
16 … 400 Hz*
Nominal voltage AC range
Nominal frequency range
Nominal voltage DC range
Consumption
Power-on transient current
AC Rated voltage
Nominal frequency range
Consumption
40 … 276 V
45 … 65 Hz
24 … 300 V
< 5VA
< 20 A; 1 ms
110, 230 V
45 … 65 Hz
< 5VA
Current input
Frequency
Power supply
Universal
Transformer
* Only for frequency measurement
6.4 Connection
Permitted conductor cross-sections
Terminals
Voltage / Current inputs
Aux Supply
Analogue output
Communication
User’s Manual Max. conductor cross-sections (stranded wire)
0,325 … 2,5 mm2 (22 – 14 AWG) one conductor
0,325 … 2,5 mm2 (22 – 14 AWG) one conductor
0,325 … 2,5 mm2 (22 – 14 AWG) one conductor
0,325 … 2,5 mm2 (22 – 14 AWG) one conductor
25 Technical data
6.5 Analogue output
General
Linearization
No. of break points
Output value limits
Response time
Response time – Fast
Residual ripple
Residual ripple - Fast
Linear, Quadratic
5
+ 120 % of nominal output
Input → output < 100 ms (1)
Input → output < 50 ms (1)
< 1 % p.p.
< 2 % p.p.
Output range values
0 … 1 mA
0 … 5 mA
0 ... 10 mA
0 ... 20 mA
Other ranges
Burden voltage
External resistance
0 … 100 %
Range 1
Range 2
Range 3
Range 4
possible by MiQen software
10 V
RBmax =10 V / IoutN
DC Current output
DC Voltage output
Output range values
0…1V
0 … 10 V
Other ranges
Burden current
External resistance
0 … 100 %
Range 5
Range 6
possible by MiQen software
20 mA
RBmin= UoutN / 10 mA
6.6 Communication
Type
Type of connection
Max. connection length
Number of bus stations
Terminals
Insulation
Transfer mode
Protocol
Transfer rate
RS232
RS485
Direct
Network
3m
1000 m
−
≤ 32
Screw terminals
Protection class II, 500VACRMS 1min
Asynchronous
MODBUS RTU
2.400 to 115.200 bit/s
USB(2)
Direct
3m
−
mini USB-B (2)
/
USB 2.0
(1) Not for frequency, frequency response time:
typical
maximum
300 ms
3000 ms
(2) After installation of instrument onto DIN rail not accessible any more
26 User’s Manual Technical data
6.7 Electronic features
Response time
Input → communication
All calculations are averaged over an interval of between 8 to
256 periods. Preset interval is 64 periods, which is 1.28 second
at 50 Hz. Average interval below 64 periods may result to
unstable measurements, depended on measuring signal.
Status LED’s
PWR
Red
Instrument power ON
6.8 Safety features
Protection
Pollution degree
Installation category
Test voltages
EMC
Protection class II
Double insulation on all connectors ( analogue output, voltage /
current input and RS232/485 Com port)
2
CAT III; 600 V meas. Inputs Acc. to EN 61010-1
CAT III; 300 V aux. supply Acc. to EN 61010-1
Universal UAUX↔ output, COM: 3500 VACrms
Transformer UAUX↔ output, COM: 5200 VACrms
U / I input↔Output, COM, Aux power supply: 5200 VACrms
Output↔COM: 500 VACrms
Directive on electromagnetic compatibility 2004/108/EC
Acc. to EN 61326-1
6.9 Mechanical
Enclosure protection
Flammability
Mounting
Dimensions
Weight
ABS self-extinguish ability, in compliance with UL 94 V0
IP 20
Acc. to UL 94 V-0
Rail mounting 35 × 15 mm acc. to EN 50022
W45 × H75× D105 mm
340 g Transformer aux. power supply
170 g Universal aux. power supply
6.10 Environmental conditions
Ambient temperature
Operating temperature
Storage temperature
Temperature koefficient
Average annual humidity
Altitude
User’s Manual usage group II
0 … 15 … 30 … 45 °C
Acc. to EN 60688
- 30 to + 70 °C
- 40 to + 70 °C
+-0.1% per 10°C
≤ 93% r.h.
≤ 2000 m
27 Technical data
6.11 Reference conditions
Ambient temperature
Relative humidity
Voltage input
Current input
Frequency
Waveform
0 .. 45 °C
≤ 93% r.h.
57.7…500V
0.31…5A
45…65Hz
Sinus
6.12 Dimensions
Construction
Appearance
Programmable
AC measuring
transducers
MT416/418
28 User’s Manual Appendix A: Modbus protocol
7.
APPENDIX A: MODBUS PROTOCOL
7.1 Modbus communication protocol --------------------------------------------------------------- 30 Modbus .................................................................................................................................................. 30 VERSION1: ........................................................................................................................................... 30 Register table for the actual measurements ........................................................................................... 30 VERSION2: ........................................................................................................................................... 31 Register table for the actual measurements ........................................................................................... 31 Data types decoding............................................................................................................................... 32 User’s Manual 29
Appendix A: Modbus protocol
7.1 Modbus communication protocol
Modbus protocol is enabled via RS232 and RS485 or USB communication.
Modbus
Modbus protocol enables operation of device on Modbus networks. For device with serial
communication the Modbus protocol enables point to point (for example Device to PC)
communication via RS232 communication and multi drop communication via RS485
communication. Modbus protocol is a widely supported open interconnect originally designed by
Modicon.
The memory reference for input and holding registers is 30000 and 40000 respectively.
VERSION1:
Register table for the actual measurements
Parameter
Frequency
U1
I1
THD HARMONIC DATA
U1 THD%
I1 THD%
Internal Temperature
DEMAND VALUES
DYNAMIC DEMAND VALUES
I1
MAX DEMAND SINCE LAST
RESET
I1
30 MODBUS
Register
Type
Start
End
30105
30107
30126
30106
30108
30127
30182
30188
30181
T5
T5
T5
MT416
MT418
T16
T16
T17
MT416
MT418
30502
30503
T5
MT418
30518
30519
T5
MT418
User’s Manual Appendix A: Modbus protocol
VERSION2:
Register table for the actual measurements
Parameter
Frequency
U1
THD HARMONIC DATA
U1 THD%
I1 THD%
Internal Temperature
DEMAND VALUES
DYNAMIC DEMAND VALUES
I1
MAX DEMAND SINCE LAST
RESET
I1
MODBUS
Register
Start
End
30049
30057
30050
30058
30639
30645
30181
Type
T5
T5
T16
T16
T17
MT416
MT418
MT416
MT418
30175
30176
T5
MT418
30207
30208
T5
MT418
All other MODBUS registers are a subject to change. For the latest MODBUS register
definitions go to ISKRA MIS’s web page www.iskra-mis.si
User’s Manual 31 Appendix A: Modbus protocol
Data types decoding
Type
Bit mask
T1
T2
T3
T4
bits # 15…14
bits # 13…00
T5
bits # 31…24
bits # 23…00
T6
bits # 31…24
bits # 23…00
T7
bits # 31…24
bits # 23…16
bits # 15…00
T9
bits # 31…24
bits # 23…16
bits # 15…08
bits # 07…00
T10
bits # 31…24
bits # 23…16
bits # 15…00
T16
T17
T_Str4
T_Str6
T_Str8
T_Str16
T_Str40
32 Description
Unsigned Value (16 bit)
Example: 12345 = 3039(16)
Signed Value (16 bit)
Example: -12345 = CFC7(16)
Signed Long Value (32 bit)
Example: 123456789 = 075B CD 15(16)
Short Unsigned float (16 bit)
Decade Exponent(Unsigned 2 bit)
Binary Unsigned Value (14 bit)
Example: 10000*102 = A710(16)
Unsigned Measurement (32 bit)
Decade Exponent(Signed 8 bit)
Binary Unsigned Value (24 bit)
Example: 123456*10-3 = FD01 E240(16)
Signed Measurement (32 bit)
Decade Exponent (Signed 8 bit)
Binary Signed value (24 bit)
Example: - 123456*10-3 = FDFE 1DC0(16)
Power Factor (32 bit)
Sign: Import/Export (00/FF)
Sign: Inductive/Capacitive (00/FF)
Unsigned Value (16 bit), 4 decimal places
Example: 0.9876 CAP = 00FF 2694(16)
Time (32 bit)
1/100s 00 - 99 (BCD)
Seconds 00 - 59 (BCD)
Minutes 00 - 59 (BCD)
Hours 00 - 24 (BCD)
Example: 15:42:03.75 = 7503 4215(16)
Date (32 bit)
Day of month 01 - 31 (BCD)
Month of year 01 - 12 (BCD)
Year (unsigned integer) 1998..4095
Example: 10, SEP 2000 = 1009 07D0(16)
Unsigned Value (16 bit), 2 decimal places
Example: 123.45 = 3039(16)
Signed Value (16 bit), 2 decimal places
Example: -123.45 = CFC7(16)
Text: 4 characters (2 characters for 16 bit register)
Text: 6 characters (2 characters for 16 bit register)
Text: 8 characters (2 characters for 16 bit register)
Text: 16 characters (2 characters for 16 bit register)
Text: 40 characters (2 characters for 16 bit register)
User’s Manual Appendix B: Calculations & Equations
8.
APPENDIX B: CALCULATIONS & EQUATIONS
8.1 Calculations---------------------------------------------------------------------------------------- 34 Definitions of symbols........................................................................................................................... 34 8.2 Equations ------------------------------------------------------------------------------------------- 34 Voltage ................................................................................................................................................... 34 Current ................................................................................................................................................... 34 THD ....................................................................................................................................................... 35 User’s Manual 33
Appendix B: Calculations & Equations
8.1 Calculations
Definitions of symbols
No
Symbol
Definition
1
Mv
Sample factor
2
MP
Average interval
3
Uf
Phase voltage
4
N
Total number of samples in a period
5
n
Sample number (0 ≤ n ≤ N)
6
in
Current sample n
7
ufn
Phase voltage sample n
8.2 Equations
Voltage
N
Uf =
∑u
2
n
N − samples in one period (up to 65 Hz)
N − samples in Mv periods (above 65 Hz)
Example: 400 Hz → MV = 7
n =1
N
Current
N
IRMS =
34 ∑i
2
n
n =1
N
Phase current
N − 128 samples in a period (up to 65 Hz)
N − 128 samples in more periods (above 65 Hz)
User’s Manual Appendix B: Calculations & Equations
THD
63
If THD(% ) =
∑ In
n =2
I1
63
U f THD(% ) =
User’s Manual 2
⋅ 100
∑ Un
n =2
U1
2
⋅100
Current THD
I1 − value of first harmonic
n − number of harmonic
Phase voltage THD
U1 − value of first harmonic
n − number of harmonic
35 Appendix B: Calculations & Equations
Iskra MIS, d. d.
Ljubljanska cesta 24a
SI-4000 Kranj, Slovenia
Phone: 04 237 21 12
Fax: 04 237 21 29
E-mail: info@iskra-mis.si
www.iskra-mis.si
Printed in Slovenia • Subject to change without notice • Version 1.06 / Apr. 2012 • GB K 22.496.501
User’s Manual 36
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