Iskra WM1-6A User manual

User’s Manual
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Energy meters WM1x6A
Single-phase electrical energy meter
WM1-6A
Single-phase electrical energy meter
WM1M6A
December 2021 • Version 1.01

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User’s Manual
Single-phase electrical energy meter
WM1x6A
User and Installation manual

User’s Manual
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Security Advices and Warnings
Please read this chapter carefully and examine the equipment carefully for potential damages which might
arise during transport and to become familiar with it before continue to install, energize and work with a
single-phase energy meter WM1x6A.
This chapter deals with important information and warnings that should be considered for safe installation
and handling with a device in order to assure its correct use and continuous operation.
Everyone using the product should become 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.
PLEASE NOTE
This booklet contains instructions for installation and use of single-phase energy meter WM1x6A.
Installation and use of a device also includes handling with dangerous currents and voltages
therefore should be installed, operated, serviced and maintained by qualified personnel only.
ISKRA 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 device is used for
measuring or supervision, please contact a person who is responsible for installation of such
system.
Before switchingthedevice ON
Check the following before switching on the device:
Nominal voltage.
Terminals integrity.
Protection fuse for voltage inputs (recommended maximal external fuse size is 65 A).
External switch or circuit breaker must be included in the installation for disconnection of the
devices’ power supply. It must be suitably located and properly marked for reliable
disconnection of the device when needed.
Proper connection and voltage level of I/O module.

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User’s Manual
Used symbols on devices’ housing
and labels
SYMBOL
EXPLANATION
DANGER
Indicates proximity of hazardous high voltage, which might result in serious injury
or death if not handled with care.
WARNING
Indicates situations where careful reading of this manual is required and following
requested steps to avoid potential injury is advised.
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.
Compliance of the product with UK Conformity Assessed (UKCA) directives.
Disposal
It is strongly recommended that electrical and electronic equipment (WEEE) is not deposit 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 equipment.

BASIC DESCRIPTION AND OPERATION
User’s Manual
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Table of contents
1BASIC DESCRIPTION AND OPERATION 1
1.1 DESCRIPTION OF THE DEVICE 2
1.2 SINGLE-PHASE ENERGY METERS APPLICATION 3
1.3 MAIN FEATURES 3
2CONNECTION 4
2.1 MOUNTING 5
2.2 ELECTRICAL CONNECTION 6
3FIRST STEPS 9
3.1 DISPLAY OF DEVICE INFO 10
3.2 LCD USER INTERFACE 11
3.3 LIMITS 18
3.4 FREEZE COUNTERS 22
4SETTINGS 24
4.1 INTRODUCTION 25
4.2 MIQEN SOFTWARE 25
4.3 DEVICES MANAGEMENT 26
4.4 DEVICE SETTINGS 27
4.5 REAL-TIME MEASUREMENTS 29
4.6 DATA ANALYSIS 31
4.7 MY DEVICES 31
4.8 SOFTWARE UPGRADING 31
5MEASUREMENTS 32
5.1 INTRODUCTION 33
5.2 SELECTION OF AVAILABLE QUANTITIES 34
5.3 CALCULATION AND DISPLAY OF MEASUREMENTS 35
6TECHNICAL DATA 37
6.1 ACCURACY 38
6.2 MECHANICAL CHARACTERISTICS OF INPUT 38
6.3 ELECTRICAL CHARACTERISTICS OF INPUT 38
6.4 SAFETY AND AMBIENT CONDITIONS 41
6.5 EU DIRECTIVES CONFORMITY 42
6.6 DIMENSIONS 42
7ABBREVIATION/GLOSSARY 43
8APPENDICES 44
8.1 APPENDIX A: MODBUS COMMUNICATION PROTOCOL 44
8.2 APPENDIX B: M-BUS 57
8.3 APPENDIX C: EQUATIONS 59

BASIC DESCRIPTION AND OPERATION
User’s Manual
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1BASIC DESCRIPTION AND OPERATION
The following chapter presents basic information about a single-phase energy meter WM1x6A required
to understand its purpose, applicability and basic features connected to its operation.
In this chapter you will find:
1.1 DESCRIPTION OF THE DEVICE 2
1.2 SINGLE-PHASE ENERGY METERS APPLICATION 3
1.3 MAIN FEATURES 3

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1.1 Description of the device
The single-phase energy meters WM1-6A, WM1M6A (MID certified) are intended for energy
measurements in single-phase electrical power network and can be used in residential, industrial and
utility applications. Meters measure energy directly in 2-wire networks according to the principle of fast
sampling of voltage and current signals. A built-in microprocessor calculates active/reactive/apparent
power and energy, current, voltage, frequency, power factor, power angle and frequency from the
measured signals. This smart meter can also perform basic harmonic analysis (THDU, THDI). This enables
quick overview of harmonic distortion either coming from a network or generated by the load.
Microprocessor also controls LCD, LED, IR communication and optional extensions.
Connecting terminals can be sealed up against non-authorised access with protection covers. They are
built to be fastened according to EN 60715 standard.
1.1.1 Appearance
Figure 1: Appearance of single-phase electric energy meter WM1x6A
1Current terminals –to load
2Information display
3IR COMM PORT –ON SIDE
4DIN-Rail fitting
5User button and LED indicator
(1000 imp/kWh)
6Current terminal –source
(max 65 A)
7AUX terminals (options):
-RS485
-M-BUS
-TARIFF INPUT
LCD
Number of digits: 8 (7+1)
Height of digits: 4.52 mm
LED
Colour: red
Pulse rate: 1000 imp/kWh
LED on: no load indication

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1.2 Single-phase energy meters application
Energy meters have built-in optical (IR) communication port on the side as a standard. Special WM-USB
adapter (size 1 DIN module) can easily be attached to it. It can be used for direct communication with a
PC to change settings of devices without any communication installed. A built-in pulse output is
designed for sending data to the devices for checking and monitoring consumed energy.
Energy meters could also be connected with iHUB-L1 or Bicom by optical communication (IR).
Optional the meter can be equipped with the following communications:
RS485 serial communication with the MODBUS protocol,
M-BUS serial communication,
Communication modules enables data transmission and thus connection of the measuring places into
the network for the control and management with energy.
Instead of communication modules, there can be also tariff input (option).
Tariff input provides measurement of two tariffs for selected energy registers.
On the housing there are only two terminals, thus only one functional extension is possible (serial
communication, tariff input or M-bus).
1.3 Main features
Single-phase direct connected DIN-rail mounting meters up to maximum current (Imax) 65 A.
Basic current (Ib) 5 A.
MID approval (option for WM1M6A).
Class 1 for active energy according to EN 62053-21 and Baccording to EN 50470-3 .
Class 2 for reactive energy according to EN 62053-23.
Reference frequency 50 Hz and 60 Hz.
Bidirectional energy measurement (import/export).
Reference voltage 230 V ().
Voltage operating range (-20 % ... +15 %).
Pulse output according to EN 62053-31.
Tariff input (option).
RS485 serial communication (option).
M-BUS serial communication (option).
Display LCD 7+1 digit (100 Wh resolution).
Multifunctional front LED.
LED constant 1000 imp/kWh.
Built-in optical (IR) communication port.
Measurement of
opower (active, reactive, apparent),
oenergy (active/reactive/apparent).
oVoltage.
oCurrent.
oFrequency.
oPower factor.
oPower angle.
oActive tariff (option).
oTHD of voltage.
oTHD of current.
2-DIN rail width mounting according to EN 60715.
Sealable terminal cover.

CONNECTION
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2CONNECTION
This chapter deals with the instructions for single-phase electrical energy meter WM1x6A connection.
Both the use and connection of the device includes handling with dangerous currents and voltages.
Connection shall therefore be performed ONLY by a qualified person using an appropriate equipment.
ISKRA, d.o.o. 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.
In this chapter you will find:
2.1 MOUNTING 5
2.2 ELECTRICAL CONNECTION 6

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2.1 Mounting
Singlee-phase electrical energy meter WM1x6A is intended only for DIN-rail mounting. In case of using
the stranded wire, the ferrule must be attached before the mounting. Ferrule contact length should be
18 mm.
Figure 2: Dimensional drawing and rear connection terminals position

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Figure 3: Electrical
diagram 230 VAC
2.2 Electrical connection
WARNING
Wrong or incomplete connection of voltage or other terminals can cause non-operation or
damage to the device.
To prevent electrical shock and/or equipment damage, disconnect electrical power at the main
fuse or circuit breaker before installation or any servicing.
Make sure, that no voltage is present in the installation.
Prevent the disconnecting device from being switched on accidentally.
Connect the module according to electrical diagram.
Meter is used for direct connection into the two-wire networks. Meter can be equipped with different
modules. Pictures below are showing equipped combinations.
Recommended installation:
1Mounting to DIN rail according to DIN EN60715
2Power contacts:
a. Power contacts capacity:
Flexible (Rigid) 1.5 mm2 –16* (25) mm2(*Ferrule contact length should be 18
mm. Wire stripped to 20 mm.)
b. Connection screws M5
c. Max torque 3.5 Nm
3Auxiliary terminals:
a. Auxiliary terminals contact capacity
Flexible (Rigid) 0.05 mm2–1 (2.5) mm2
b. Auxiliary terminals screws M3
c. Max torque 0.6 Nm
PLEASE NOTE
Neutral wire must be connected to the meter.
Mark
Meaning
LI
Live input
NI
Neutral input
LO
Live output
NO
Neutral output

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Figure 4: Connection
diagram for M-BUS
option
Figure 5: Connection
diagram for tariff input
option
Figure 6: Connection
diagram for pulse
output and RS485
communication
Complete WM1x6A system is assembled with three units:
Current and voltage capture unit.
Measurement and processing unit (MAPU) with SMPS or capacitor power supply unit, IR
communication, LED indicator, LCD support and EEPROM.
Communication unit (MODBUS RS485, M-BUS, TARIFF) WITH Pulse output.
2.2.1 Communication connection
For communication with outside world multiple manners are used:
IR communication module using MODBUS protocol is equipped on each meter. It can be used
for setting and testing the meter using WM-USB adapter.
Pulse output (option) module is used for counting number of pulses depending on consumed
energy.
Tariff input (option) module is used to set active tariff.
LED diode is used for indication of no-load condition (I < 0,02A) and test output proportional
to measured active energy (1000 imp/kWh). It can be also switched to reactive energy for test
purpose using IR communication.
RS485 (option) communication module is galvanic isolated form the meter. It enables setting
the meter, data readout in the network and tariff setting.
M-BUS (option) communication module is galvanic isolated form meter. It enables setting the
bound rate and the address of the meter (for more informations see appendix 8.2).
Push button is used to select display of desired measured or group of them.

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Table 1: Survey of communication connection
Auxiliary terminal
1
2
3
4
5
M-Bus
SO+
SO-
NC
M+
M-
Tariff input
SO+
SO-
NC
AC1
AC2
RS485*
SO+
SO-
NC
A
B
*It is recommended to use ferrite bead on communication line RS485 (two turns) to reduce
radiated emission.
PLEASE NOTE
Check labels on the side of the meter to check what modules are built in.

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3FIRST STEPS
Programming a single-phase electrical energy meter WM1x6A is very transparent and user friendly.
Numerous settings are organized in groups according to their functionality.
In this chapter you will find basic programming steps:
3.1 DISPLAY OF DEVICE INFO 10
3.2 LCD USER INTERFACE 11
3.3 LIMITS 18
3.4 FREEZE COUNTERS 22

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3.1 Display of device info
On LCD measured data are presented. Display scrolls automatically. Displayed quantities and scroll time
can be set via communication by MiQen software. Energy meters have LCD display with following layout.
1Tariff setting for displayed counter/actual tariff
2(→) Energy import/active power import
(←) Energy export/active power export
3kWh display
4kvarh display
5Actual Value
6Info:
VAh display
PF –power factor
VA –apparent power
PA –power angle
7A –currently active counter, nr –non resettable
counter or r –resettable counter
8W –active power
var –reactive power
9Inductive or capacitive load
Figure 8: Layout of LCD
Energy registers are displayed with resolution 7 + 1 (kWh, kvarh and kVAh). The meter can be set to Test
measuring mode which displays energy registers with better resolution. The test mode is used for test
purposes during type testing and test of meter constant during initial verification. After power off meter
automatically goes back to normal operation.
3.1.1 Welcome screens
Segment check Built version
.

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3.2 LCD User Interface
After the electrical connection, the display shows a welcome screen for two seconds then the firmware
version for the next two seconds. The following is a measurement screen automatically cycling on the
screen, regarding the period that is defined in settings. The cycling period and required measurement
could be set factory or in MiQen software.
Regarding the period that is defined in settings, measurement screen cycling is started until any key is
pressed.
The LCD display allows displaying the following measurement values:
1Energy registers. Two different types (resettable and non-resettable), both of them count the
same quantity. The resettable energy counter can be reset, while the non-resettable has been
measuring the quantity continuously. The energy counter you reset starts to re-measure the
value from the zero value.
I. Resetable energy counters
i. Energy counter 1 (default)
ii. Energy counter 2
iii. Energy counter 3
iv. Energy counter 4
II. Non resetable energy counters
i. Energy counter 1
ii. Energy counter 2
iii. Energy counter 3
iv. Energy counter 4
2Actual measured values
I. Active Power
II. Reactive Power
III. Apparent Power
IV. Power Factor
V. Voltage
VI. Frequency
VII. Current
VIII. Power Angle
The measured values can be scrolled automatically or can be selected by pressing button.

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3.2.1 Energy counters
Energy counters are represented as shown on LCD examples bellow (up to 4 resetable counters, letter r representing it). At the top of the
screen is settings of energy counter (tariff, import/export/total, active/reactive/apparent), the 8-digit numerical number shows the value of
the energy and the letter at the bottom shows actual activity (counting (A)/not counting ( )).
Non-MID meters show resettable counters (letter r representing it).
MID meters show non resettable counters (letters nr representing it).
Counter 1 shows: Import Active Energy = 6250.3 kWh at Tarif 2.
Counter 2 shows: Export Active Energy = 70352.5 kWh at Tarif 1.
Counter 3 shows: Total Active Energy = 2369025.3 kWh at both Tarif 1 and 2.
Counter 4 shows: Total Active Energy = 105101.5 kWh at Tarif 1.
3.2.2 Other counters
The number on the screen shows the actual value of the measured quantity (P-W, Q-var, S, PF, U, f and I). On the screen as well is the direction
of active energy flow (import/export), reactance (inductive/capacitive) and active tariff (regarding tariff input).
Active power:
Current:

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Voltage:
Reactive power:
Apparent power:
Power factor:

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Power angle: Frequency:
3.2.3 Display menu structure
The display menu is entered by holding the push button for more than one second. Blinking of the screen indicates that.
Short clicks then move user through the main menu.
By holding the button when positioned on certain screen ( e.g. counter menu, set, info, etc…) the Set sub-menu is entered.