Download ME372

Energy Measurement and Management
ME372
Single-phase electronic meter
with built-in communication
channel
Technical description
Version 1.0, 09.03.2006
Contents:
1. Meter appearance ................................................ 5
1.1. Meter case ...................................................... 5
1.2. Over-all and fixing dimensions........................ 6
2. Meter configuration ............................................. 6
2.1. Metering system.............................................. 6
2.2. Power supply stage......................................... 6
2.3. Microcontroller ................................................ 6
2.3.1. Load-profile recorder................................ 7
2.3.2. Log-book .................................................. 7
2.3.3. Keeping of billing results .......................... 7
2.4. Real-time clock ............................................... 7
2.4.1. Time-of-use registration ........................... 7
2.4.2. Maximum demand.................................... 7
2.5. LED ................................................................. 7
2.6. LCD................................................................. 8
2.6.1. Data display.............................................. 8
2.6.2. Signal flags............................................... 8
2.7. Push-buttons................................................... 9
2.7.1. LCD testing............................................... 9
2.7.2. Manual data scroll .................................... 9
2.7.3. Load-profile data display ........................ 10
2.7.4. Manual meter billing reset ...................... 10
2.8. Communication channels ..............................10
2.8.1. Optical port..............................................10
2.8.2. RS485 communication interface - option11
2.8.3. Integrated GSM/GPRS communication
interface with antenna - option..........................11
2.8.4. Readout via built-in communication
interfaces ..........................................................11
2.9. Inputs and outputs.........................................11
2.9.1. Alarm inputs ............................................11
2.9.2. Load control output .................................12
2.10. Detectors of opening meter and terminal
block covers..........................................................12
2.11. Built-in circuit-breaker..................................12
3. Data protection...................................................12
4. Meter connection procedure.............................12
4.1. Connection procedure of GSM/GPRS
communication interface ...................................13
5. Accessory for meters managing ......................13
6. Meter maintaining ..............................................13
7. Meter connection ...............................................14
8. Technical data ....................................................15
9. Meter type designation......................................16
Energy Measurement and Management
ME372 Single-phase electronic
meter
The ME372 electronic single-phase meter is
designed for measurement and registration of active
energy in single-phase two-wire networks for direct
connection. The metering and technical properties of
the meters comply with the IEC 62053-21 and IEC
62052-11 (former IEC 61036) international standards
for electronic meters of active energy for classes 1
and 2.
The meters are designed and manufactured in compliance with the ISO 9001 standard.
The ME372 meters are the third generation of Iskraemeco electronic single-phase meters for a deregulated market of electric power, with the following
common functional properties:
• Time-of-use measurement of active energy and
maximum demand (in up to 4 tariffs)
• Load-profile registration (option)
• LCD in compliance with the VDEW specification,
with two modes of data display
• Internal real-time clock
• Two pushbuttons: Reset and Scroll
• Optical port in compliance with the IEC 62056-21
standard for local meter programming and data
downloading
• Built-in interface or a modem for remote meter
programming and data downloading
• M-Bus
• Built-in circuit breaker
• Prepaid functionality
The first generation of Iskraemeco electronic singlephase meters for a deregulated market of electric
power, i.e. the ME420 meters had RS232 or RS485
interface for remote two-way communication, and
utilized IEC 62056-21, mode C the communication
protocol.
The second generation of Iskraemeco electronic
single-phase meters for a deregulated market of
electric power, i.e. the ME351 had an integrated DLC
modem for two-way communication via low voltage
distributions network - or upon request - RS485
interface instead, for remote two-way communication.
It utilized the DLMS communication protocol in compliance with the IEC 62056-51 standard as well as
IEC 62056-21, mode C protocol. These meters had
the following additional functional properties:
• Two S0 pulse inputs (option)
• Pulse output
• Tariff input (option)
The third generation of Iskraemeco electronic singlephase meters for a deregulated market of electric
power consists of two meter types: the ME372 meter
with built-in GSM/GPRS modem – or upon request RS485 interface instead, for remote two-way
communication.
Meter utilize the DLMS communication protocol in
compliance with the IEC 62056-46 standard as well
as IEC 62056-21, mode C protocol. Further to the
ME372 meters functionality they also enable:
• Detectors of the meter and the terminal box
covers opening
•
•
Module for remote disconnection / re-consection of the customer premises (option)
M-Bus for reading other meters (heat, gass,
watter)
ME372 ─ Electronic three-phase meters
with built-in communication channel
ME372 meter properties:
• Meter of active energy and demand
ƒ Accuracy class 1 or 2
•
•
•
•
Modes of energy measurement and
registration
ƒ For one-way energy flow direction,
ƒ For two-way energy flow direction,
ƒ For two-way energy flow direction
registered in one (absolute) register
but
Meter quality:
ƒ Due to high accuracy and long term stability
of metering elements no meter re-calibration
over its life-time is required
ƒ High meter reliability
ƒ High immunity to EMC
Additional meter functions:
ƒ The second metering element can be built
into the meter – measurement of current that
flows through the neutral conductor (option
for BS housing)
ƒ Measurement and registration of under- and
over-voltage
ƒ Generation of alarms and their transmitting
via the DLC modem and low voltage network
•
Load-profile recorder:
ƒ Two load profile objects with 16 capture
objects each
• Communication channels:
ƒ Infrared optical port in compliance with the
IEC 62056-21 for local meter programming
and data down-loading
ƒ Built-in GSM/GPRS modem or RS485
communication interface instead
ƒ Built in M-Bus communication interface
•
LCD:
ƒ In compliance with the VDEW specification
•
Data display modes:
ƒ Automatic cyclic data display with display
time of 10 sec
ƒ Manual data display mode (by pressing the
Scroll push-button)
•
Indicators:
ƒ LCD:
- Presence of phase voltage L1
- Phase currents flow direction
- Valid tariff at the moment
- Meter status and alarms
OBIS data identification code: IEC 62056–61
• Auxiliary inputs / outputs:
ƒ M-Bus communication interface instead
ƒ An load control relay output used for load
management
•
Automatic configuration of an AMR system:
ƒ The meters are registered themselves into an
AMR system
•
Detection of opening meter and terminal
block covers
•
Current terminals:
ƒ Enable fast installation of meters into network
ƒ Make good contact with current conductors
regardless of their design and material
Time-of-use registration (up to 4 tariffs):
ƒ Tariffs change-over by internal real-time clock
•
4
ƒ LED:
- Imp / kWh
- Test frequency for testing accuracy of the
meter time base (only in the meter testing
mode)
• Communication protocols:
ƒ Optical port: IEC 62056 – 21, mode C or
DLMS (in compliance with IEC 62056 – 46)
ƒ GSM/GPRS modem or RS485: DLMS by IEC
62056 – 46
ƒ COSEM organization of data: IEC 62056-53
ƒ M-Bus: EN 13757-2 and EN 13757-3
ƒ Do not damage conductors.
•
Potential links:
ƒ Potential links enable simple disconnection of
potential and current circuits of the meter
ƒ The potential links can be mounted in the terminal block compartment or under the meter
cover
•
•
Simple and fast meter installation
Compact plastic meter case:
Made of high quality self-distinguishing UV
stabilized material that can be recycled
ƒ IP54 protection against dust and water
penetration (by IEC 60529)
ƒ
ME372 ─ Electronic three-phase meters
with built-in communication channel
1. Meter appearance
with a hinge. The lid covers the Reset push-button
and can be sealed in the closed position.
The terminal block contains current terminals,
auxiliary terminals and potential links for supplying
potential circuits of the meter.
ITEM
1
2
3
4
5
6
7
8
9
DESCRIPTION
Licquid cristal display (LCD)
Meter tehnichal data
Legend for data shovn on LDC
A meter cover sealing screw
A terminal cover
A terminal cover sealing screw
Impulse LED
Scroll (blue) and Reset (orange) keys
IR optical interface
Two screws for fixing the meter cover (item 4) are
sealed with metrological seals.
One screws for fixing the terminal block cover (item
6) and the Reset push-button lid (item 8) are sealed
with seals of electric utility.
1.1. Meter case
A compact meter case consists of a meter base with
a terminal block and three fixing elements for
mounting the meter, a meter cover and a terminal
block cover. The case is made of self-distinguishing
UV stabilized polycarbonate which can be recycled.
The case ensures double insulation and IP54 (IEC
60529) protection level against dust and water
penetration.
The top hanger is on the back side of the meter base,
under the top edge. On request an extended top
hanger can be mounted on the meter base, which
ensures the upper fixing hole height of 230 mm
above the line connecting the bottom fixing holes
(DIN 43758).
The meter cover is made of transparent polycarbonate. A nickel-plated iron ring in the right top corner
is utilized for attaching an optical probe to the optical
port. There is a lid which is fixed to the meter cover
ITEM
1
2
3
4
5
6
7
8
9
DESCRIPTION
A switch for detection of terminal cover
opening
Screw to screwing current cables
Aditional voltage terminals
Current terminals
Neutral terminals
Load control output
M-Bus communicatin interface
Second alarm input
First alarm input
Current terminals (item 4) are made of galvanized
iron sheet. They are universal terminals for all shapes
and cross sections of connected conductors up to
25 mm2. The terminals ensure the same contact
quality with conductors either they are made of
copper or aluminum. Only one screw in a current
terminal reduces time needed for the meter
installation in the field. Due to the indirect pressure on
the conductor it is not damaged.
Up to 10 auxiliary terminals can be fitted in the meter.
They can be utilized for M-Bus, bi-stabile 6 A relay
for load control or alarm-inputs. Inputs and outputs
are fitted into the meter regarding the customers
request at meter ordering.
Voltage terminals (item 3) are built into the meter
upon request. They are intended for supplying an
add-on unit from the meter terminal block.
Detectors of opening the terminal block cover (item 1)
and the meter cover (it is on the PCB adjacent to the
optical port) are built into the meter upon request.
The terminal block cover can be long or short. The
meter connection diagram is stuck on the inner side
of the terminal block cover.
5
ME372 ─ Electronic three-phase meters
with built-in communication channel
1.2. Over-all and fixing dimensions
2.1. Metering system
The metering systems enable, beside precission
measurement of active energy and demand in a wide
metering and temperature range, measurement of
phase voltages and currents too.
One metering element is built in the meters. The
current sensor is shunt, while voltage sensor is
resistive voltage divider. Signals of currents and
voltages are fed to the A/D converters, and then they
are digitally multiplied so that instantaneous power is
calculated. The instantaneous powers are integrated
and summed in a microcontroller, as well as further
processed.
Over-all and fixing dimensions of a meter fitted with
a long terminla block cover
2. Meter configuration
Metering element
GSM/GPRS MODEM
or
Rs485 COMMUNICATION INTERFACE
The metering elements ensure excellent metering
properties:
1. Wide metering range
2. Negligible influence of disturbances and influence
quantities
3. High long-term stability so that meter re-calibration
is not required over its life-time
4. Long meter life-time and high reliability in use
2.2. Power supply stage
The power supply stage consists of a switcher, which
enables a meter to operate accuratelly in a wide voltage range. It enables a meter to operate accuratelly
even when voltage in the network is only 80% of the
rated voltage.
2.3. Microcontroller
The microcontroller acquires signals from the metering elements, processes them and calculates values
of measured energy. The results are stored in energy
registers for particular tariffs. It also calculates demands and register maximum demand in billing periods. The microcontroller also generates pulses for
the LED and the output pulses, enables two-way
communication via the optical port, the DLC modem
and M-Bus and drives the LCD and the control
outputs. The microcontroller enables registration of a
load-profile and events into a log-book, as well.
6
ME372 ─ Electronic three-phase meters
with built-in communication channel
2.3.1. Load-profile recorder
2.4.1. Time-of-use registration
Two load profile objects are provided with up to
sixteen capture objects each. The following
registration periods 15, 30 and 60 minutes or a daily
value can be set.
The meter enables registration of energy and
demand in up to four tariffs. Tariff changeover is
defined with hour, minute and second. Minimal
resolution between changeovers is one minute. The
real-time clock enables complex daily and weekly
tariff struc-tures, as well as a couple of seasons in a
year:
• Up to 4 seasons in a year
• Up to 8 daily definitions of the changeover
program
• Up to 8 changeovers inside individual daily tariff
programs
• Up to 32 holidays in which a special tariff
program is defined including the holidays relating
to the lunar calendar
Data in a load-profile recorder are accompanied with
a time stamp and with the meter status in the last
saving period as well as with a check sum. The time
stamp indicates the end of a registration period.
2.3.2. Log-book
The meters can register up to 128 events and meter
status in a log-book which is organized as a FIFO
memory. In this way, the last 128 events and meter
status are always available. The following events and
meter status can be registered:
• Meter fatal error
• Billing reset of the meter
• Time setting of the real-time clock
• Voltage failure
• Voltage re-establishing in the network
• Erased registers of the load-profile recorder
• Erased registers of the log-book
• Voltage failure
• Voltage re-establishing
• Opening of the meter and the terminal block
covers
2.3.3. Keeping of billing results
The meter keeps billing results (energy and demand
values registered by tariffs) for last 18 billing periods.
A number of billing periods (months) for which billing
results are kept is set in the factory and can not be
changed subsequently. The billing results are stored
in a FIFO memory, so that they are always available
for the last n (n = 1, 2, …18) billing periods,
regardless if the meter billing reset was performed by
means of the Reset push-button, RTC or remotely via
communication channel. The metering results of the
past billing periods can not be displayed; they can be
read out via communication channels, i.e. via optical
port and DLC modem.
2.4.2. Maximum demand
The real-time clock generates a demand period.
Demand is calculated as an average value over the
demand period. The following demand periods can
be set in the meter: 5, 15, 30 and 60 minutes. At the
end of the demand period, calculated demand value
is transferred from a register for current demand
period into a register for previous demand period and
is compared with a value in a register of the
maximum demand. If new demand value is larger
than the value in the maximum demand register, then
it is entered into the maximum demand register,
otherwise the old maximum demand value is kept. In
this way, a maximum demand is registered at the
meter billing reset.
2.5. LED
The meter is provided with a LED on the front plate.
The LED emits pulses with frequency that is
proportional to the measured power and is intended
for the meter calibration and testing. The LED is
turned-on and glows steadily if load is lower than the
meter starting current.
2.4. Real-time clock
A real-time clock is controlled with a 32.768 kHz
crystal. Its accuracy complies with the IEC 62052-21
standard for time switches. The RTC involves an
internal calendar that assures information on year,
month, day, day in a week, hour, minute, second and
leap year.
A super capacitor is used as the RTC back-up power
supply. It assures 250 hours of the RTC operation reserve. For a complete charging of the super capacitor
the meter should be connected to network voltage for
at least 60 minutes.
7
ME372 ─ Electronic three-phase meters
with built-in communication channel
2.6. LCD
The 7-segment LCD, with additional characters and
symbols, complies with the VDEW specifications.
Large characters and a wide angle view enable easy
data reading.
Data are displayed in the right-side bottom corner by
means of eight 8 mm high alphanumeric characters.
The OBIS code (by IEC 62056-61) is employed for
data identification. It is displayed in the left bottom
corner by means of five 6 mm high alphanumeric
characters.
An indicator of energy flow direction is displayed in
the left top corner. A physical unit of displayed
quantity is shown in the right top corner. The indicator
of L1 phase voltage presence is displayed in the
middle of the top row.
In the LCD bottom row there are eleven signal flags
that indicate current valid tariff, meter status and
alarms. Meaning of each signal flag is engraved on
the meter name plate beneath each of the signal
flags in use.
2.6.1. Data display
Data defined in Auto scroll sequence and in Manual
scroll sequence are displayed on the LCD. Data from
Auto scroll sequence are dispalyed in a circle, each is
displayed for 10 sec. At Manual scroll sequence the
blue push-button should be pressed for displaying the
next piece of data. Data in Manual scroll sequence
remains displayed until the blue push-button is
pressed again or until time for automatic return into
the Auto scroll sequence is not elapsed.
Data that can be displayed are listed in the table
bellow. Which of them will be displayed depends on
customer request at meter ordering.
CODE
DATA DESCRIPTION
0.0.0
C.1.0
0.9.1
0.9.2
1.2.1.8.0
1.3.1.8.0
1.8.0
15.8.0
1.8.1
15.8.1
1.8.2
Meter serial number
Meter manufacturer number
Time
Date
Value on counter for the first pulse input
Value on counter for the second pulse input
Total imported active energy (A+)
Total absolute active energy |A|
Imported active energy in the first tariff (T1)
Absolute active energy in the first tariff |T1|
Imported active energy in the 2-nd tariff (T2)
8
CODE
DATA DESCRIPTION
15.8.2
1.8.3
15.8.3
1.8.4
15.8.4
2.8.0
2.8.1
2.8.2
2.8.3
2.8.4
1.6.1
1.6.2
1.6.3
1.6.4
2.6.1
2.6.2
2.6.3
2.6.4
F.F*
Absolute active energy in the 2-nd tariff |T2|
Imported active energy in the third tariff (T3)
Absolute active energy in the third tariff |T3|
Imported active energy in the fourth tariff (T4)
Absolute active energy in the fourth tariff |T4|
Total exported active energy (A-)
Exported active energy in the first tariff (T1)
Exported active energy in the 2-nd tariff (T2)
Exported active energy in the third tariff (T3)
Exported active energy in the 4-th tariff (T4)
A+ import. max. demand in the first tariff (T1)
A+ import.max. demand in the 2-nd tariff (T2)
A+ import. max. demand in the 3-rd tariff (T3)
A+ import. max. demand in the 4-th tariff (T4)
A- export. max. demand in the first tariff (T1)
A- export.max. demand in the 2-nd tariff (T2)
A- export. max. demand in the 3-rd tariff (T3)
A- export. max. demand in the 4-th tariff (T4)
Meter fatal error*
2.6.2. Signal flags
The signal flags in the display bottom row indicate
certain meter status and alarms. The following flags
are active at the ME372 meters:
FLAG
STATUS
T1
T2
T3
T4
Lit
Lit
Lit
Lit
T1,
T2,
Blinking
T3, T4
CB
Lit
MEANING
The first tariff is active
The second tariff is active
The third tariff is active
The fourth tariff is active
The meter is in the program
mode. Mode is acceble when
meteorological seals from the
meter cover are remowed.
Circuit breaker disconect
customer, output is open
Signal quality
SQ
REG
Lit
Lit
Lit
DRO
Blinking
FF
Lit
SET
Lit
The meter is registered into the
AMR communication network
Meter data down-loading is in
progress
Data package is present in the
AMR communication network
Meter fatal error (the meter
should be dismounted and sent
to examination)
Meter is in setting mode
* If the FF code is displayed, the meter should be dismounted from a place of measurement and sent to an
authorized repair shop or to the manufacturer for
examination.
ME372 ─ Electronic three-phase meters
with built-in communication channel
2.7. Push-buttons
There are two push-buttons on the meter front side:
• RESET push-button – the orange pushbutton that is under the lid with a hinge and
can be sealed independently from the meter
cover.
Its primary function is to perform the meter
billing reset.
•
SCROLL push-button – the blue push-button
that is always accessible.
Its primary function is to scroll data from the
Manual scroll sequence on the LCD.
Besides the above described push-buttons, the
meters are provided with the third one, which is builtin on the PCB under the meter cover – a Param
push-button. When depressed it enables to enter into
the meter programming in a laboratory, and at the
same time it is used as a hardware-lock against
tamper attempt.
2.7.1. LCD testing
The LCD should be tested in order to check if all its
segments are in order. When the meter is in Auto
scroll mode, the blue push-button should be pressed
shortly (Tp < 2 sec) to enter into the LCD test mode.
The LCD test lasts for 10 seconds so that all LCD
segments are displayed. After that time the meter
returns back into the Auto scroll mode.
2.7.2. Manual data scroll
Depending on the time of depressing the pushbuttons
and a combination of depressed pushbuttons they
enable:
• Selection mode of meter operation mode,
• Testing the LCD
• Scrolling of metering results and setting
meter parameters,
• Performing manual billing reset of the meters
• Alarms reset
Time of depressing the orange push-button does not
influence in its function, while at the blue push-button
three different lengths of depression times are
available:
a. Short – time of push-button depression
shorter than 2 sec – next data in the manual
sequence is displayed.
b. Long – time of push-button depression
longer than 2 sec and shorter than 5 sec
– displayed submenu or function is selected
c. Extended
–
time
of
push-button
depression longer than 5 sec – displayed
data get back one level up (e.g. if data from
the third level are displayed, then the blue
push-button should be pressed three times,
and each time it should be kept depressed for
more than 5 sec in order to return back to
Auto scroll mode).
Data from the Manual scroll sequence are displayed
in the following manner. The meter should be put into
the LCD test mode (see item 2.7.1) and during the
LCD testing the blue push-button should be
depressed for a short time (Top <2 sec). A Std-data
title is displayed on LCD indicating that the meter
menu for selecting either Manual data scroll or Loadprofile display function is opened.
If Manual data scroll function is to be selected, the
blue push-button should be depressed for a long time
(2 sec < Tp < 5 sec), after which the first data from
the Manual scroll sequence is displayed. For displaying the following data from the Manual scroll
sequence, the blue push-button should be depressed
for a short time (Tp <2 sec).
If the blue push-button is depressed short (Tp <2 sec)
when a Std-dAtA title is displayed, the next title P1.0 in the menu (function for displaying data from
the load-profile recorder) is displayed.
To exit the Manual scroll mode the blue push-button
should be depressed for extended time (Tp > 5 sec).
9
ME372 ─ Electronic three-phase meters
with built-in communication channel
2.7.3. Load-profile data display
When a Std-dAtA title is displayed on the LCD (see
item 2.7.2), the blue push-button should be depressed for a short time (Tp <2 sec), so that a P1.0 title of
the function for displaying load-profile data is
displayed.
If Load-profile data display function is to be selected,
the blue push-button should be depressed long
(2 sec < Tp < 5 sec), after which the last date for
which data in the Load-profile recorder exist is displayed. At each short depression (Tp < 2 sec) of the
blue push-button date of a previous day is displayed
until all dates for which data in the load-profile recorder exist are displayed. When date of a day for
which load-profile data are to be read is displayed on
the LCD, the blue push-button is to be depressed
long (2 sec < Tp < 5 sec), after which the first meter
status for that date is displayed. After next short
depression (Tp < 2 sec) of the blue push-button a
load-profile data for this re-cording period is
displayed. By each short depression of the blue pushbutton a load profile data for one previous registration
period is displayed.
period is completed and after that the billing reset will
be executed. As long as the microcontroller waits to
execute the meter billing reset, the BR signal flag is
displayed. When meter billing reset is executed, data
from registers for a current month are transferred into
registers for a previous month, the registers for
current month are initialized and a reset counter is
incremented.
In order to prevent temper attempts of the Reset
push-button after meter billing reset, the orange
push-button is disabled for one demand period. If the
Reset push-button is pressed once again in a time
period shorter than the demand period, the second
meter reset command will not be executed.
After pressing the Reset push-button, its lid should be
closed and sealed again.
Upon request, the function of manual meter billing
reset can be disabled by software.
2.8. Communication channels
The ME372 meters are equipped with the following
communication channels:
a. Optic port
b. M-Bus (option)
c. GSM/GPRS modem or
d. RS485
communication
interface
instead
GSM/GPRS modem
1
5
The last date for which
load-profile data exist
(2004-May-26)
4
Meter
status
for
selected date (code and
value – five digit data).
Load-profile data of the
first channel for the selected date – Total imported active energy A+
(register 1.8.0; 123456
kW)
To exit the load-profile data display mode the blue
push-button should be depressed for an extended
time (Tp > 5 sec) or if load-profile data for a certain
date is displayed, the blue push-button should be depressed three times for an extended time (Tp > 5 sec)
(load-profile data ⇒ date ⇒ title load-profile function
P1.0 ⇒ Auto scroll mode).
2.7.4. Manual meter billing reset
In order to perform manual billing reset of the meter,
so that the meter is made ready for a new billing
period, the seal of the Reset (orange) push-button lid
should be broken. The Reset push-button should be
pressed when the meter is in the Auto scroll mode.
The billing reset will not be executed immediately –
the microcontroller will wait until the current demand
10
2
ID
1
2
3
4
5
3
DESCRIPTION
Place for external coupling device
RS485 communication interface
MBus communication interface
SIM card bed for GSM/GPRS communication
IR optical port
2.8.1. Optical port
The optical port complies with the IEC 62056-21 and
is used for local meter programming and data downloading. It is located in the right top corner of the
meter. The communication protocol complies with
IEC 62056-21, mode C or DLMS-HDLC IEC
62056-46. The communication is serial asynchronous
with data transmission rate from 300 bit/sec to 19,200
bit/sec. If data transmission rate of the used optical
probe is lower than 19,200 bit/sec, the maximum permissible data transmission rate is equal to that value.
If higher data transmission rate is set, communication
via optical port will not be possible.
ME372 ─ Electronic three-phase meters
with built-in communication channel
M-Bus
There is M-Bus module integrated in ME372 meters
acording to EN 13757-2 and EN 13757-3 micromaster specification which enables connection of 4
slave devices (water, gass or/and heat meters) and
max. length of wireing 50 m. There is auto-install
procedure implemented.
GSM/GPRS interface: at successful communication,
several flags are displayed. The flag above the SQ
mark indicates signal strength, the flag above the
REG mark – if present - indicates that the meter is
ready for telecommunication network, and the flag
above the DRO mark indicates that communication is
going on.
2.8.2. RS485 communication interface option
A built-in communication interface enables setting of
meter parameters and a local readout of measuring
results. The protocol for data transfer is IEC 62056 –
46.
2.8.3. Integrated GSM/GPRS communication
interface with antenna - option
It enables data transmission via a communication
interface towards the centre for management and
billing or a data concentrator. Data transmission rate
via network is 9600 baud/s, while actual data
transmission rate depends on momentary conditions
in network.
A GSM antenna is built in the meter. It enables
operation in three frequency ranges
• 900 MHz
• 915 MHz
• 1800 MHz
Fig. 5 – Display legend
2.9. Inputs and outputs
The meters can be provided with up to ten auxiliary
terminals. The following inputs and outputs are
possible:
• Two Alarm inputs (option)
• Output for load control by a bi-stabile 6 A relay
• M-Bus communication interface
2.9.1. Alarm inputs
There can be up to two inputs for detecting auxillary
alarm and they are open collector type.
If a built-in antenna does not meet the needs of
covering the signal, an external antenna can be
mounted. Coupling circuit is placed on the meter
cover and enables a simple mounting of a coupling
module.
Common
Input
Fig. 4 – Coupling circuit
2.8.4. Readout via built-in communication
interfaces
Built-in communication interfaces enable:
• Reading of registers
• Reading of load profile
• Reading of meter parameters
• Changing of meter parameters
Communication state is shown on a display, i.e.
RS485 and IR interface: during communication, a
flag above a DRO mark is blinking
11
ME372 ─ Electronic three-phase meters
with built-in communication channel
2.9.2. Load control output
The load control output is with a bi-stabile relay. The
bi-stabile relay can break 6 A at 250 V, Depending on
a customer request the control relay can be
controlled by time-schedule set in the meter (for
ON/OFF switching of appliances by a time-schedule),
by calculating trend of maximum demand (load limiter
function), or by remote command (together with a
built-in circuit breaker – function of remote disconnecting /re-connecting of customer premises).
Load control
Common
2.10. Detectors of opening meter and
terminal block covers
Detectors of opening meter and terminal block covers
are built into the meter on request. The detectors are
two push-button switches which make a signal when
the covers are opened. The event is registered in the
log-book together with date and time (a time-stamp)
of its occurrence.
2.11. Built-in circuit-breaker
Built-in circuit breaker is 100 A circuit-breaker.
Additional functionality allows to verify actual
connection/dissconnection (anti-temper function).
Circuit-breaker can be controlled according to timeschedule, maximum demand or by remote command.
12
3. Data protection
Special attention is paid to a system of meter data
protection in order to prevent meter tampering.
Access to the billing data registers in order to change
their values is not possible. Param pushbutton that is
under the meter cover, so that two seals should break
first.
4. Meter connection procedure
1. The meter should be fixed with three screws at the
place of measurement.
2. The meter should be connected according to the
meter connection diagram that is attached to the
meter terminal block cover. Torque of the screws
tightening in the current terminals is 2.5 Nm.
3. The meter operation should be checked:
ƒ The LED is turned-on (load current is lower
than the meter starting current)
ƒ The LED is blinking with frequency
proportional to the engaged electric power
(the meter measures and registers energy)
ƒ The LED is turned-off (the meter is not
energized). In this case it should be checked
if:
a. current conductors are connected to the
meter (if not, they should be connected)
b. the potential links are in their bottom
position (if not, the potential link slides should
be pushed to their bottom position)
c. If both upper conditions are fulfilled, it
means that there is no voltage in the mains.
4.
Check the L1 indicator on the LCD.
•
Check date and time set in the internal RTC
and, if needed, set the correct values
•
Make billing reset of the meter
•
Seal the meter (terminal block cover and the
lid of the orange pushbutton).
ME372 ─ Electronic three-phase meters
with built-in communication channel
4.1. Connection procedure of
GSM/GPRS communication
interface
5. Accessory for meters managing
Checking of the presence of a SIM card
1. Remove a terminal block cover.
2. Check if a SIM card is inserted as shown on a
figure below
3. If a SIM card is not inserted, insert it into the
shown place
• For maintaining meter programming and
data down-loading:
ƒ MeterView (Iskraemeco software)
ƒ Optical probe
ƒ Personal computer: PC, desk-top, lap-top.
The accessory is intended for the personel who maintains and programs meters in a repair shop and in the
field.
• For meter reading and programming in the
field:
ƒ MeterRead (Iskraemeco software) for all
types of hand-held computers (Palm-top PC),
utilizing the Windows CE operation system,
ƒ Optical probe.
Fig. 8 – SIM card bed
Check the GSM/GPRS signal strength on LCD:
a. The flag is permanently lit; good covering with
a GSM/GPRS signal.
b. The flag is blinking; bad covering with the
GSM/GPRS signal. It is recommended to find a
better location for meter installation.
c. The flag is not lit; it is recommended to find a
better location for installation. If the flag is not lit
even on a new place, an external antenna is
required.
Note, limits are adjustable
For the meters managing the folowing accessories
are availble:
• For remote meter reading and programming:
ƒ SEP2W (Iskraemeco software, with modules
for remote meter reading, data base management and a module for data presentation
and printing)
ƒ Central station – a server with corresponding
software and hardware.
6. Meter maintaining
No maintenance is required during the meters lifetime. The implemented metering technique, built-in
components and manufacturing procedures ensure
high long-term stability of the meters, so that there is
no need for their re-calibration during their life-time.
13
ME372 ─ Electronic three-phase meters
with built-in communication channel
7. Meter connection
The meter connection diagram is stuck on the inner
side of the terminal block cover. The meters can be
connected in single-phsae two-wire net-works.
Communication interface – M-Bus
Hardware type
Function
Communication interface
Common
Communication interface
Mini master
Terminal
90
91
Communication interface – RS485
Hardware type
Function
RS485 – GND
G
RS485 – A
B
RS485 – B
A
RS485 – A
B
RS485 – B
A
Terminal
28
27
29
27
29
Inputs
Hardware type
Low voltage (up to 24V,
27mA)
Low voltage (up to 24V,
27mA)
Outputs
Hardware type
High voltage (250V, 6A)
14
Function
Common
Terminal
20
Alarm input
15
Common
85
Alarm input
80
Function
Common
Load
control
Terminal
35
34
ME372 ─ Electronic three-phase meters
with built-in communication channel
8. Technical data
GENERAL METERING CHARACTERISTICS
Accuracy class
2 or 1 ( IEC 62053-21)
Base current Ib
5A
Max. current Imax
85 A
Thermal current
1,2 Imax
Starting current
<0.005 Ib at cosϕ = 1, for class 2
<0.004 Ib at cosϕ = 1, for class 1
Short-circuit
30 Imax
current
Reference
1x230 V
voltage
(other voltages on request)
Voltage range
0,8 Un ... 1,15 Un
Rated frequency
50 Hz or 60 Hz
Meter constant
1.000 imp/kWh at Imax = 85 A
(at LED)
Operating
temperature
-25°C ... +60°C
range
Extended
temperature
-40°C ... +70°C
range
Storage
-40°C ... +80°C
temperature
Voltage circuit
< 2 W / 10 VA
burden
Current circuit
< 0,16 VA
burden
(regardless to meter base current )
INTERNAL RTC
Accuracy
≤±6 ppm or ≤±3 min / year
(at 25°C)
RTC operation
150 hours
reserve
(back-up power source: super cap)
Crystal frequency 32 kHz
OPTICAL PORT
Optical port
IEC62056-21 (IEC61107)
Protocol
IEC62056-21 (IEC61107) Mode E
and DLMS IEC62056-46,
Data identification
OBIS (IEC 62056-61)
code
19,200 bit/sec (limited with data
Data transmission transmission rate of the used optical
rate
probe)
LOAD-PROFILE RECORDER
Number of
2
objects
OUTPUTS
High voltage
output
Hardware type; bistable relay
Output type; Load control
Switching voltage: 250 V
Switching current: 6 A
INPUTS
Low voltage input
Hardware type: Passive transistor
input
Inputs type; Alarm input 1
Switching voltage: 3 – 24 V AC/DC
Low voltage input
Hardware type: Passive transistor
input
Inputs type; Alarm input 2
Switching voltage: 3 – 24 V AC/DC
BUILT-IN CIRCUIT BREAKER
Module type: bi-stabile relay
Built-in circuitBreaking voltage: 230 V
breaker
Breaking current: 100 A
EMC
Dielectric strength 4 kV, 50 Hz, 1 min
Electrostatic
15 kV ( IEC 61000 - 4 - 2 )
discharge
High frequency
electromagnetic
10 V/m ( IEC 61000 - 4 – 3 )
field
Burst
4 kV ( IEC 61000 - 4 - 4 )
Impulse voltage
12kV, 1,2/50 µ s ( IEC 62053-21
and IEC 62052-11) – into the main
metering circuitry
6 kV, 1.2/50 µs ( IEC 62053-21 and
IEC 62052-11) – into the auxiliary
circuits
OVER-ALL DIMENSIONS AND MASS
Meter with a long terminal block cover
Dimensions
132 x 200 x 78 mm (w x h x d)
Mass
0.8 kg
RS485 communication interface
Protocol
Data transmission
rate
IEC62056-46 or IEC62056-21
Marking of registers in compliance
with OBIS (IEC62056-61)
115200 bit/sec
GSM/GPRS communication interface
Protocol GSM
Protocol GPRS
Data transmission
rate
IEC62056-46 or IEC62056-21
IEC62056-46,
GSM: 9600 bit/sec
GPRS: 28000 bit/sec
Actual rate depends on network
configuration!
M-Bus
Protocol
Baud-rate
Wireing length
No. slave devices
EN 13757-2 and EN 13757-3
2400 bit/s
50 m
4
15
ME372 ─ Electronic three-phase meters
with built-in communication channel
9. Meter type designation
Electronic meter
single-phase meter
With built-in remote communication interface
M
E
372
-
Terminal block for Imax=85 A (DIN 43857)
Terminal block for Imax=100 A (DIN 43857)
Active energy, class 1
Active energy, class 2
One energy-flow direction measurement
Two energy-flow direction measurement
Measurement of energy absolute value
D1
D3
A4
A5
1
2
4
-
Pulse input (option)
Number of inputs (n = 1, 2)
Resistor type pulse input
Build in circuit breaker
Phase disconection
Control output with bi-stabile relay
One control output
Relay output with make contact
V
n
2
P
1
B
1
1
M
2
K
0
3
a
g
Z
Internal RTC
Back-up power supply source: super
capacitor
Communication channel
Optical port by IEC 62056 – 21
RS485 communication interface
Built in GSM/GPRS modem
Active M-Bus (master)
Load-profile recorder (option)
Due to improvements the actually delivered products can differ in some details from the data stated in this technical description.
Iskraemeco d.d., Energy Measurement and Management
4000 Kranj, Savska loka 4, Slovenia
Phone (+386 4) 206 40 00, Fax: (+386 4) 206 43 76
http://www.iskraemeco.si, E-mail: [email protected]
Publisher: Iskraemeco, Marketing
Reserved right to modifications without notice.
16
ME372_tehnichal description_20060309.doc