Iskra MT406 User manual

User’s Manual
Voltage Transducer MT406
Current Transducer MT408
GB


Tableofcontents
User’sManualiii
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 MEASURING TRANSDUCER _________4
2.1 Introduction----------------------------------------------------------------------------------------- 5
2.2 Glossary --------------------------------------------------------------------------------------------- 5
2.3 Description of the product ------------------------------------------------------------------------ 6
2.4 Purpose and use of measuring transducer------------------------------------------------------ 6
3.CONNECTION ___________________________________________________________7
3.1 Introduction----------------------------------------------------------------------------------------- 8
3.2 Mounting -------------------------------------------------------------------------------------------- 8
3.3 Electric connection--------------------------------------------------------------------------------- 8
4.TECHNICAL DATA_______________________________________________________10
4.1 Applied standards---------------------------------------------------------------------------------11
4.2 Accuracy--------------------------------------------------------------------------------------------11
4.3 Measuring input-----------------------------------------------------------------------------------12
4.4 Measuring output----------------------------------------------------------------------------------12
4.5 Connection -----------------------------------------------------------------------------------------12
4.6 Safety features -------------------------------------------------------------------------------------13
4.7 Mechanical-----------------------------------------------------------------------------------------13
4.8 Environmental conditions------------------------------------------------------------------------13
4.9 Dimensions-----------------------------------------------------------------------------------------13


Securityadviceandwarnings
User’sManual1
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

Securityadviceandwarnings
2User’sManual
1.1 Welcome
Please read this chapter carefully before starting work with a measuring transducer.
This chapter deals with important information and warnings that should be considered for safe
handling with a measuring transducer.
1.2 Introduction
This booklet contains instructions for installation and use of measuring transducers MT406/408.
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,
•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.

Securityadviceandwarnings
User’sManual3
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:
−Measuring transducer MT406/408
−Quick guide.

Basicdescriptionandoperationofmeasuringtransducer
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2. BASIC DESCRIPTION AND OPERATION OF MEASURING
TRANSDUCER
2.1 Introduction----------------------------------------------------------------------------------------- 5
2.2 Glossary --------------------------------------------------------------------------------------------- 5
2.3 Description of the product ------------------------------------------------------------------------ 6
2.4 Purpose and use of measuring transducer------------------------------------------------------ 6

Basicdescriptionandoperationofmeasuringtransducer
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2.1 Introduction
MT406 and MT408 are voltage / current transducers with minimal differences in functionality.
Where there are some characteristic features that denote MT406 or MT408 symbol next to data.
User information
For unknown technical terms please refer to Glossary.
2.2 Glossary
Term Explanation
RMS Root Mean Square value
AC Alternating voltage, current
DC Direct voltage, current

Basicdescriptionandoperationofmeasuringtransducer
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2.3 Description of the product
Measuring transducer is intended for measuring single-phase voltage or current. It measures the
average absolute value of the voltage or current and is calibrated for the RMS value for a sine
wave input. The transducer is powered from measuring circuit due to it does not need auxiliary
supply.
Appearance
1 – Analogue output
2 –Voltage/Current input
Analogue output
Analogue output is connected through screw-in connectors.
Voltage input (MT406)
Voltage input is connected to measuring circuit through measuring voltage transformer.
Maximum value of input voltage is 500 VL-N.
Current input (MT408)
Current input is connected to measuring circuit through current transformer. Maximum allowed
thermal value of input current is 6A (cont.).
2.4 Purpose and use of measuring transducer
Voltage transducer MT406
The MT406 voltage transducer is used for a permanent monitoring of a single-phase voltage
value. PLCs, PCs, microprocessor control, indicators, alarms units etc. can be operated by the
output signal.
Voltage input can be connected either directly to low-voltage network or shall be connected to
network via a corresponding voltage transformer (with standard 100V output).
Current transducer MT408
The MT408 current transducer is used for a permanent monitoring of a single-phase current
value. PLCs, PCs, microprocessor control, indicators, alarms units etc. can be operated by the
output signal.
Current input can be connected either directly to low-voltage network or shall be connected to
network via a corresponding current transformer (with standard 1 A or 5 A output).

Connection
User’sManual7
3. CONNECTION
3.1 Introduction----------------------------------------------------------------------------------------- 8
3.2 Mounting -------------------------------------------------------------------------------------------- 8
3.3 Electric connection--------------------------------------------------------------------------------- 8

Connection
8User’sManual
3.1 Introduction
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 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 and nominal frequency.
Check protective fuse rating (the recommended maximum rating of the external protective fuse
for this equipment is 6A - Red Spot type or equivalent).
Warning!
Wrong or incomplete connection of measurement or other terminals can
cause malfunction or damage the device.
3.2 Mounting
MT406/408 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 measuring transducer can be connected directly to low-voltage network or via
appropriate voltage measuring transformer to medium or high voltage network.
Current inputs of measuring transducer can be connected directly to low-voltage network or via a
corresponding current transformer.
Choose corresponding connection from the figures below and connect corresponding voltages
and currents. Information on electrical characteristics is given in chapter Measuring Inputs on
page 12.

Connection
User’sManual9
System/ connection Terminal assignment
MT406
Voltage measurement
MT408
Current measurement
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 E1/3
AC voltage U E2/11
Analogue output:
+ D15
– D16

Technicaldata
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4. TECHNICAL DATA
4.1 Applied standards---------------------------------------------------------------------------------11
4.2 Accuracy--------------------------------------------------------------------------------------------11
4.3 Measuring input-----------------------------------------------------------------------------------12
4.4 Measuring output----------------------------------------------------------------------------------12
4.5 Connection -----------------------------------------------------------------------------------------12
Permitted conductor cross-sections ....................................................................................................... 12
4.6 Safety features -------------------------------------------------------------------------------------13
Protection ............................................................................................................................................... 13
4.7 Mechanical-----------------------------------------------------------------------------------------13
4.8 Environmental conditions------------------------------------------------------------------------13
4.9 Dimensions-----------------------------------------------------------------------------------------13

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4.1 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
4.2 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.
MT408
Reference value: Output end value
Basic accuracy: Class 0.5,
Reference conditions:
Current 0% … 100% x IN
Ambient temperature range 15 … 30°C
Frequency fN± 2Hz
Output burden RB max / 2
Additional error:
Temp influence: max. ± 0.2% / 10 K
Frequency influence: 0,5% / (∆10Hz)
Burden influence: 0,1% / (∆R
b
max / 2)
MT406
Reference value: Output end value
Basic accuracy: Class 0.5,
Reference conditions:
Voltage 20% … 100% x UN
Ambient temperature range 15 … 30°C
Frequency fN± 2Hz
Output burden RB max / 2
Additional error:
Temp influence: max. ± 0.3% / 10 K
Frequency influence: 0,25% / (∆5Hz)
Burden influence: 0,1% / (∆R
b
max / 2)

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4.3 Measuring input
MT408
Standard nominal input current (IN) 1A, 5 A or 6 A
Measuring range limit values
Overload capacity:
Max. measured value (cont.)
0...0.5 A to 0...6 A
acc. to IEC/EN 60 688
1,2 × IN
Max. allowed value 20 × IN ; 1 s, 10 times, 300 s interval
Nominal frequency (fN) 50, 60 Hz
Measuring frequency range fN± 10%
Consumption < 2 VA
MT406
Standard nominal input voltage (UN) 57,7, 63.5, 69.3, 100, 110, 115, 120, 127, 220, 230,
240, 250, 380, 400, 415, 440, 500 V
Measuring range limit values
Overload capacity:
Max. measured value (cont.)
0...50 V to 0...500 V
acc. to IEC/EN 60 688
1,2 × UN
Max. allowed value 2 × UN ; 1 s, 10 times, 10 s interval
Nominal frequency (fN) 50, 60 Hz
Measuring frequency range fN± 10%
Consumption < 2 VA
4.4 Measuring output
Standard ranges IAN: 0…1 mA, 0…5 mA, 0…10 mA, 0…20 mA
Burden voltage: 10V
External resistance: RB max =10 V / IAN
Maximal output voltage
(open circuit current output)
< 25 V
Maximal output current: MT408
MT406
3 × IAN
2 × IAN
Residual ripple < 1% p.p.
Response time < 300 ms
The output may be either short or open-circuited. It is electrically insulated from all other
circuits.
4.5 Connection
Permitted conductor cross-sections
Terminals Max. conductor cross-sections (stranded wire)
Voltage / Current inputs 0,325 … 2,5 mm2(22 – 14 AWG) one conductor
Analogue output 0,325 … 2,5 mm2(22 – 14 AWG) one conductor

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4.6 Safety features
Protection Protection class II
Double insulation between analogue output and voltage
/ current input
Pollution degree 2
Installation category CAT III; 600 V meas. Inputs Acc. to EN 61010-1
Test voltages 50 Hz, 1 min. acc to EN61010-1 5200 V, measuring
input versus measuring output and other surface
EMC Directive on electromagnetic compatibility
2004/108/EC
Acc. to EN 61326-1
4.7 Mechanical
ABS self-extinguish ability, in compliance with
UL 94 V0
Enclosure protection IP 20
Flammability Acc. to UL 94 V-0
Mounting Rail mounting 35 × 15 mm acc. to EN 50022
Dimensions W45 × H75× D105 mm
Weight 280 g
4.8 Environmental conditions
Ambient temperature usage group II
- 10 … 15 … 30 … 55 °C
Acc. to EN 60688
Operating temperature - 20 to + 70 °C
Storage temperature - 40 to + 70 °C
Average annual humidity
≤
93% r.h.
Altitude
≤
2000 m
4.9 Dimensions
Construction Appearance
Measuring
transducers
MT406/408

Technicaldata
14User’sManual
Iskra MIS, d. d.
Ljubljanska cesta 24a
SI-4000 Kranj, Slovenia
Phone: 04 237 21 12
Fax: 04 237 21 29
E-mail: [email protected]
www.iskra-mis.si
PrintedinSlovenia•Subjecttochangewithoutnotice•Version1.01/Feb.2011•GBK22.496.503
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