Alstom i4MC User manual

I4MC & i4MV
iSTAT Single-Phase Transducers
Manual
i4MC & i4MV
iSTAT Single-Phase Transducers
Publication Reference: i4MC&V/EN/M/C
i4MC&V/EN/M/C © 2014. ALSTOM, the ALSTOM logo and any alternative version thereof are trademarks and service marks of ALSTOM. The other names
mentioned, registered or not, are the property of their respective companies. The technical and other data contained in this document is provided for information only.
Neither ALSTOM, its officers or employees accept responsibility for, or should be taken as making any representation or warranty (whether express or implied), as to
the accuracy or completeness of such data or the achievement of any projected performance criteria where these are indicated. ALSTOM reserves the right to revise or
change this data at any time without further notice.
GRID

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Page 1 iSTAT i4MC&V
1. SAFETY SECTION
This Safety Section should be read before commencing any work on the equipment.
1.1 Health and Safety
The information in the Safety Section of the product documentation is intended to ensure
that products are properly installed and handled in order to maintain them in a safe condition.
It is assumed that everyone who will be associated with the equipment will be familiar with
the contents of the Safety Section.
1.2 Explanation of symbols and labels
The meaning of symbols and labels may be used on the equipment or in the product
documentation, is given below.
Caution: refer to product documentation Caution: risk of electric shock
Protective/safety *earth terminal Functional *earth terminal
Note: This symbol may also be used
for a protective/safety earth terminal if
that terminal is part of a terminal block
or sub-assembly e.g. power supply.
*NOTE: The term earth used throughout the product documentation is the
direct equivalent of the North American term ground.

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2. INSTALLING, COMMISSIONING AND SERVICING
Equipment connections
Personnel undertaking installation, commissioning or servicing work on this equipment
should be aware of the correct working procedures to ensure safety. The product
documentation should be consulted before installing, commissioning or servicing the
equipment.
Terminals exposed during installation, commissioning and maintenance may present a
hazardous voltage unless the equipment is electrically isolated.
If there is unlocked access to the rear of the equipment, care should be taken by all
personnel to avoid electrical shock or energy hazards.
Voltage and current connections should be made using insulated crimp terminations to
ensure that terminal block insulation requirements are maintained for safety. To ensure that
wires are correctly terminated the correct crimp terminal and tool for the wire size should be
used.
Before energising the equipment it must be earthed using the protective earth terminal, or
the appropriate termination of the supply plug in the case of plug connected equipment.
Omitting or disconnecting the equipment earth may cause a safety hazard.
The recommended minimum earth wire size is 2.5mm2, unless otherwise stated in the
technical data section of the product documentation.
Before energising the equipment, the following should be checked:
Voltage rating, frequency and polarity
VT ratio and phase sequence
CT circuit rating and integrity of connections;
Protective fuse rating;
Integrity of earth connection (where applicable)
Supply voltage
External switch or circuit-breaker must be included in the installation for disconnection
of the devices’ auxiliary power supply. It must be suitably located and properly marked
for reliable disconnection of the device when needed.
Important: A current transformer secondary should be shorted before connecting the
transducer.

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3. EQUIPMENT OPERATING CONDITIONS
The equipment should be operated within the specified electrical and environmental limits.
3.1 Current transformer circuits
Do not open the secondary circuit of a live CT since the high level voltage produced may be
lethal to personnel and could damage insulation.
be installed with the correct polarity, to avoid possible damage to the equipment.
3.2 Insulation and dielectric strength testing
Insulation testing may leave capacitors charged up to a hazardous voltage. At the end of
each part of the test, the voltage should be gradually reduced to zero, to discharge
capacitors, before the test leads are disconnected.
3.3 Opening Enclosure
There are no customer replaceable PCB cards or components within the enclosure, so the
enclosure should not be opened.
4. DECOMMISSIONING AND DISPOSAL
Decommissioning: The auxiliary supply circuit in the relay may include capacitors across
the supply or to earth. To avoid electric shock or energy hazards,
after completely isolating the supplies to the relay (both poles of any
dc supply), the capacitors should be safely discharged via the external
terminals prior to decommissioning.
Disposal: It is recommended that incineration and disposal to water courses is
avoided. The product should be disposed of in a safe manner. Any
products containing batteries should have them removed before
disposal, taking precautions to avoid short circuits. Particular
regulations within the country of operation, may apply to the disposal
of lithium batteries.

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5. TECHNICAL SPECIFICATIONS
5.1 Protective fuse rating
The recommended maximum rating of the external protective fuse for this equipment is 6A,
Red Spot type or equivalent, unless otherwise stated in the technical data section of the
product documentation.
Insulation class: IEC 61010-1: 2001
Class II
EN 61010-1: 2001
Class II
.
Insulation Category
(Over voltage):
IEC 61010-1: 2001
Category III
EN 61010-1: 2001
Category III
Distribution level, fixed
installation. Equipment in this
category is qualification tested at
5kV peak, 1.2/50 µs, 500 ,
0.5J, between all supply circuits
and earth and also between
independent circuits.
Environment: IEC 61010-1: 2001
Pollution degree 2
EN 61010-1: 2001
Pollution degree 2
Compliance is demonstrated by
reference to generic safety
standards.
Product Safety:
2006/95/EC
EN 61010-1: 2001
Compliance with the European
Commission Low Voltage
Directive.
Compliance is demonstrated by
reference to generic safety
standards.

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CONTENT
1. 1SAFETY SECTION
1.1 1Health and Safety
1.2 1Explanation of symbols and labels
2. 2INSTALLING, COMMISSIONING AND SERVICING
3. 3EQUIPMENT OPERATING CONDITIONS
3.1 3Current transformer circuits
3.2 3Insulation and dielectric strength testing
3.3 3Opening Enclosure
4. 3DECOMMISSIONING AND DISPOSAL
5. 4TECHNICAL SPECIFICATIONS
5.1 4Protective fuse rating
1. 9INTRODUCTION
1.1 9General
1.2 9KEY MESSAGES
1.3 9ISTAT i4Mx Family
1.3.1 9i4MV class 0.5 Voltage Transducer.
1.3.2 9i4MC class 0.5 Current transducer
1.3.3 10Software:
1.4 10Measurements
1.5 10Hardware features
1.6 10Communications
1.7 10Inputs and Outputs
2. 11HARDWARE
2.1 11The Product
2.2 11Mounting
2.3 11Connections
2.4 11Communications
2.4.1 11RS232 or RS485 communications
2.4.2 12USB communications
2.4.3 12Communication connection details
2.5 13Analogue output
2.6 13Auxiliary Supply
2.7 13Measurement Inputs
3. 14SETTINGS
3.1 14Introduction

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3.2 14QDSP Software
3.2.1 14Devices Management
3.2.2 14Instrument settings
3.2.3 14Real time measurements
3.2.4 14Software upgrading
3.3 15Setting Procedure
3.4 15General Settings
3.4.1 15Description and Location
3.4.2 15Average Interval
3.4.3 15Maximum Demand calculation (MD mode)
3.5 15Connection
3.5.1 16Setting of current or voltage ratios
3.5.2 16Used Voltage or Current Range
3.5.3 16Nominal Frequency
3.6 17Communication
3.6.1 17Serial Communication parameters (COM1)
3.6.2 17Modbus Table of Addresses
3.6.3 17USB Communications
3.7 17Security
3.7.1 17Password setting
3.7.2 17Password modification
3.8 17Analogue output
3.8.1 17Analogue output module
3.9 19Reset Operations
3.9.1 19Reset MD values on i4MC
3.9.2 19Reset the last MD period on i4MC
4. 20INSTRUMENTATION
4.1 20Measurements
4.2 20Glossary
4.3 20Supported Measurements
4.3.1 21Voltage
4.3.2 21Current
4.3.3 21Frequency
4.3.4 21Harmonics(THD)
4.3.5 21Maximum demands (MDs)
4.3.6 21Average demands
5. 23COMMUNICATIONS
5.1 23Communications ports
5.2 23QDSP Setting and Monitoring Software
5.3 23MODBUS

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6. 24TECHNICAL DATA
7. 28WIRING DIAGRAMS
8. 29RELATED DOCUMENTS
9. 30APPENDIX A: MODBUS COMMUNICATION PROTOCOL
10. 33APPENDIX B: CALCULATIONS & EQUATIONS
10.1 33Definitions of symbols
10.2 33Equations

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1. INTRODUCTION
1.1 General
i4MC & i4MV (i4MC/V) are single phase transducers aimed at the medium voltage and low
voltage market segments throughout the world.
i4MC/V offers:
High accuracy measurements
A cost-effective solution for Medium Voltage and Low Voltage markets
Modbus protocol for integrating into control systems.
CE certification
1.2 KEY MESSAGES
The
iSTAT i4MC/V provides Class 0.5 measurement of Current or Volts, and
Frequency
i4MC/V allows communication to MODBUS based systems that are widely used by
industrial and utility customers worldwide.
ISTAT – THE standard measurement platform
Multiple advanced configuration features fitted as standard.
Comprehensive choice of features for measurement applications – to satisfy all
metering, measurement and data recording and power quality applications
Flexible programmable software (QDSP) allows off line and on line settings and data
interpretation
Complete and informative documentation, QDSP also includes help information.
A choice of different input and output options.
Simple to fit, simple to set, simple to connect
1.3 ISTAT i4Mx Family
The i4Mx family consists of 3-phase and single phase transducers all of which are 0.5%
multifunction instruments. This manual details the single phase transducer models i4MC
and i4MV
1.3.1 i4MV class 0.5 Voltage Transducer.
i4MV is intended for measuring and monitoring single-phase voltages, both phase-neutral
and phase-phase. The voltage input is electrically insulated from the system by means of a
voltage transformer. It measures true RMS voltage values by means of fast sampling of the
input voltage signals, which makes it suitable for acquisition of transient events. A built-in
microcontroller calculates the measurands (voltage, frequency) from the measured signals.
The measurands can then be converted into load independent DC current or voltage which
is proportional to the true RMS measured value.
1.3.2 i4MC class 0.5 Current transducer
i4MC is intended for measuring and monitoring single-phase electrical power networks. The
input current is electrically insulated from the system by means of a current transformer. It
measures true RMS current value by means of fast sampling of the input current signals,
which makes it suitable for acquisition of transient events. A built-in microcontroller
calculates the measurands (current, frequency) from the measured signals. The measurands
can then be converted into load independent DC current or voltage which is proportional to
the true RMS measured value.

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1.3.3 Software:
The same software is used for configuring the device as on all iSTAT communicating
products.
QDSP Standard for setting and browser software
QDSP also offers additional features such as upgrading from a secure web site for
both the QDSP software and the transducer firmware.
1.4 Measurements
i4MC/V is ideally suited to applications where continuous monitoring of a single phase
system is required.
1.5 Hardware features
i4MC/V has a Red LED indicator showing that power is on.
i4MC/V has a universal auxiliary supply and an auto ranging current or voltage measurement
input so that it can be used in most site conditions without the need to specify this
information at the order stage.
1.6 Communications
i4MC/V can be supplied with either RS232 or RS485 communications via screw terminals,
which has to be defined at the time of ordering. The communications are used for
programming the transducer or for monitoring measurements.
In addition a USB port (mini type) is always provided on the underside of the i4MC/V for
programming the transducer before installation. The USB port cannot be used when the
i4MC/V is installed on the DIN Rail.
Note: The USB port has only Basic Insulation and can only be used
when there is no wiring connected to the main terminals.
Note: The Cover over the USB connector must be fitted prior to
installation or storage, if not the Warranty on the product will be void.
1.7 Inputs and Outputs
i4MC/V is fitted with one analogue output circuit which is fully programmable over the ranges
0 - 20mA and 0 - 10V.

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2. HARDWARE
2.1 The Product
1 – Analogue output
2 – Auxiliary supply
3 – Voltage or
Current inputs
4 – Communications
port
5 – Power ON LED
FIGURE 2-1: I4MV SHOWING CONNECTIONS
2.2 Mounting
The i4MC/V measuring transducer is designed for DIN rail mounting. It should be mounted
on a 35 mm DIN rail by means of a plastic fastener. Before installation the fastener should
be in open position (pulled). After the device is in place, the fastener is locked (pushed) to
closed position.
2.3 Connections
The use and connection of the i4MC/V involves the handling of dangerous currents and
voltages. Only a qualified person should therefore perform the connection.
Before use: Check voltages and phase rotation, supply voltage 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 supply, measurement or other terminals can
cause incorrect measurements, malfunction or damage to the device.
Note: After connection, settings have to be performed via communication (connection mode,
current and voltage transformers ratio …).
2.4 Communications
The i4MC/V can be supplied with no communications, RS232 or RS485 communications,
which must be specified when ordering. The communication protocol available is Modbus
RTU, which enables the remote viewing of measurements and the viewing and setting of
system parameters.
2.4.1 RS232 or RS485 communications
The i4MC/V transducers can be supplied with either a RS232 or RS485 port (COM) via
terminals.

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Connection information for COM will be shown on a label as depicted in table 2-1.
The connection of RS232 communications is usually between the i4MC/V and a PC, the
maximum connection length is 15 metres.
RS485 communications enables simultaneous connection to a maximum of 32
communicating devices; two-wire RS485 only is used. For RS485 communications, the PC
will require either an internal RS485 communications port or an external RS232/RS485 or
USB/RS485 interface. In both cases the device must provide automatic RS485 data flow
control. The maximum connection length is 1000 metres. Conductors A and B should be
terminated with a 120Ωterminating resistor on the units at each end of the RS485 network.
Connection Label
TABLE 2-1: RS232 AND RS485 CONNECTIONS
2.4.2 USB communications
The i4MC/V transducer is always supplied with a USB port on the underside, under a
removable plastic cover, for programming using an USB type mini B connector.
Note: The USB port has only Basic Insulation and can only be used
when there is no wiring connected to the main terminals.
Note: The Cover over the USB connector must be fitted prior to
installation or storage, if not the Warranty on the product will be void.
USB communication serves as a fast peer-to-terminal data link. The instrument is detected
by the host as a USB 2.0 compatible device.
See the QDSP manual for details of how to connect using the USB port.
2.4.3 Communication connection details
Connector Terminals Position RS232 RS485
21 Rx A
22 GND NC
SCREW
TERMINAL
23 Tx B
USB-mini B Standard USB 2.0 compatible cable recommended (Type
mini B plug)
TABLE 2-2: COMMUNICATIONS

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2.5 Analogue output
The i4MC/V is supplied with one analogue output, which can be set within the range 0 -
20mA or 0 - 10V. The analogue output can be configured to represent any of the
instantaneous measured values. The outputs can be set via the communications link.
The analogue module has two terminals (see TABLE 2-3).
Analogue output module with analogue
output, proportional to measured quantities.
The outputs may be either short or open-
circuited. They are electrically insulated from
each other and from all other circuits.
TABLE 2-3: ANALOGUE OUTPUT
2.6 Auxiliary Supply
The i4MC/V Measuring transducer has a universal (AC/DC) auxiliary power supply.
Connection details and ratings are shown on a label as detailed in TABLE 2-4.
Connection of universal power supply to
terminals 13 and 14
TABLE 2-4: AUXILAIRY SUPPLY
NOTE: FOR SAFETY PURPOSES IT IS IMPORTANT THAT BOTH WIRES (LINE AND
NEUTRAL) ARE FIRMLY CONNECTED. THEY SHOULD BE CONNECTED ONLY TO
THE DESIGNATED TERMINALS AS SHOWN ON THE LABEL ABOVE AS WELL AS ON
THE FRONT LABEL OF THE TRANSDUCER.
2.7 Measurement Inputs
The Voltage input of the i4MV can be connected directly to low-voltage networks or via an
appropriate voltage transformer to medium or high voltage networks.
The Current inputs of the i4MC can be connected directly to low-voltage networks or via a
current transformer.
The wiring connections are shown in section 7.
The i4MC/V has an auto-ranging voltage or current input with nominal values of 500V and
5A.

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3. SETTINGS
3.1 Introduction
Instrument settings can be remotely modified with the QDSP software, when connected to a
PC.
3.2 QDSP Software
QDSP 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. The QDSP software is available free of charge.
A separate QDSP manual is available that defines the operation of QDSP in detail.
3.2.1 Devices Management
The communications parameters for any connected device can be modified. Also included
are browsers which scan the communications networks attached to the PC and identify all of
the devices connected with their addresses and communications parameters. This can be
done on RS232, RS485 or USB (programming only) connections.
3.2.2 Instrument settings
The instrument settings are organized in a tree structure and they can be modified simply as
required. In addition to transferring settings to the instrument, QDSP can also store the data
to settings files and read it back when required.
3.2.3 Real time measurements
All measurements can be displayed in real time in a table.
If further processing of the measurement data is required it can be copied via a clipboard
and inserted into standard Windows formats.
3.2.4 Software upgrading
It is suggested that the latest version of QDSP should always be used and if the system is
also connected to the internet if will define if an upgrade is available for download.

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3.3 Setting Procedure
In order to modify the settings with QDSP the current parameters must be loaded first.
Instrument settings can be acquired via a communications link or they can be loaded off-line
from a file on a local disk. The QDSP contains sample settings files for each product variant
that can be downloaded to show the range of settings available for the specific product.
These files can be modified and then stored under a different name allowing an instrument
configuration to be generated off-line without an instrument attached, and downloaded at a
later date.
Settings are displayed in the QDSP setting window, the left part displays a hierarchical tree
structure of settings, the right hand part displays parameter values of the chosen setting
group, see Figure 3-1.
FIGURE 3-1: QDSP INTERFACE
3.4 General Settings
General Settings are essential for the operation of the measuring transducer. They are
divided into three additional sublevels (Connection, Communication and Security).
3.4.1 Description and Location
These are two parameters that are extended for easier recognition of a particular instrument.
They allow for the identification or location to be defined where measurements are
performed.
3.4.2 Average Interval
The averaging interval defines the refresh rate of measurements for communications display.
3.4.3 Maximum Demand calculation (MD mode)
The i4MC provides maximum demand values using the Thermal function.
3.5 Connection
The setting of the connection parameters must reflect the actual applications or the
measurements will not be valid.

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All of the settings in this section should be defined before the settings for the analogue and
alarm outputs, as changes to this section may automatically change the measurements and
output settings
FIGURE 3-2: CONNECTION
3.5.1 Setting of current or voltage ratios
The details of the application must be known to define these settings; all other
measurements depend on them. Values with up to 5 numerical digits and a maximum of 3
decimal places can be input.
Settings range VT primary VT secondary CT primary CT secondary
Maximum value 1638,3 kV 13383 V 1638,3 kA 13383 A
Minimum value 0,1 V 1 mV 0,1 A 1 mA
3.5.2 Used Voltage or Current Range
The setting of this range is connected with the setting of the analogue output. Using a value
that matches the expected measurement range (with overload) will achieve the highest
quality of measurements.
If the ‘Used’ ranges are changed after the analogue settings have been defined, then the
analogue settings will be modified automatically, as defined below. It may be necessary to
modify the settings for the analogue output.
The ‘Used’ ranges are used to set the default scaling for the analogue output, which can be
subsequently changed to meet the application requirements. Internally the analogue
settings are also stored as a percentage of the ‘Used’ ranges. If the ‘Used’ ranges are
subsequently changed the analogue output settings will be correspondingly changed to
maintain the settings as the same percentage of the ‘Used’ range.
3.5.3 Nominal Frequency
A valid frequency measurement is within ± 32Hz of the nominal frequency. This setting is
only used for alarms.

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3.6 Communication
The settings displayed depend on the hardware options on the specific instrument connected
or the settings in the specific settings file that is being worked on off-line.
3.6.1 Serial Communication parameters (COM1)
These parameters are important for the correct operation in RS485 networks or connections
with PC via RS232 communications. Factory settings for communication are #33\19200 (or
115200),n,8,2 (address 1 to 247\data rate 2400 to 115200 b/s, parity, data bits, stop bit).
3.6.2 Modbus Table of Addresses
With this setting a MODBUS table for measurements and settings is defined. MODBUS
addresses for measurements and settings can be compatible with previous family of
transducers (i400) or with the more advanced family of transducers (i500).
3.6.3 USB Communications
The transducer will be identified as a USB device when connected to a USB port on the PC,
refer to the separate QDSP manual for details of the driver installation.
Note: The USB port has only Basic Insulation and can only be used
when there is no wiring connected to the main terminals.
Note: The Cover over the USB connector must be fitted prior to
installation or storage, if not the Warranty on the product will be void.
3.7 Security
Parameter settings are divided into 2 groups regarding security level:
1. If the passwords are set to ‘AAAA’ (default) there is no restriction to the access of
parameter settings.
2. At the first level (PL1), the settings for MD can be accessed.
3. At the second level (PL2), access is given to all parameter settings.
4. A Backup password (BP) is used if the passwords at level 1 (PL1) and level2 (PL2)
have been forgotten, and it is different for each device depending on the serial number
of the instrument. The BP password is available from the customer support
department of Alstom Grid, and is entered instead of password PL1 and/or PL2. The
serial number is stated on the product label or can be read with QDSP and must be
supplied when requesting the BP.
3.7.1 Password setting
A password consists of four capital 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 an
asterisk.
Two passwords (PL1, PL2) and the time after which they become active, can be set.
3.7.2 Password modification
A password can be modified; however only the password whose access has been unlocked
(password entered) can be modified.
To disable a password previously set, modify the password back to ‘AAAA’.
3.8 Analogue output
3.8.1 Analogue output module
The analogue output is fully programmable.

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3.8.1.1 Output parameter
Define the Measured or calculated parameter that is to be output on the specific analogue
output.
3.8.1.2 Output range
The analogue output can be configured to one of six hardware output ranges within which
the analogue output will operate. To ensure the highest accuracy for the output, the range
selected should be the lowest that covers the required analogue output range.
DC current output DC voltage output
0…1 mA 0…1 V
0…5 mA
0...10 mA 0…10 V
0...20 mA
3.8.1.3 Output Signal
Defines the actual range and output curve shape of the required analogue signal. Up to 5
break points can be programmed to achieve the required curve.
FIGURE 3-7: ANALOGUE OUTPUT SETTINGS
If the Analogue output signal is modified from the full linear range, the accuracy of the output
may be reduced due to the reduction in the overall output range.
Note: If the ‘Used’ ranges are changed after the analogue settings have been defined, then
the analogue settings will be modified automatically, see section 3.5.2. It may be necessary
to subsequently modify the settings for the analogue outputs.
3.8.1.4 Average interval for analogue output
Defines the time interval over which the measurement used for an analogue output will be
averaged.