Panasonic KW2G Eco-POWER METER User manual

【KW2G】
Basic setting to measure by KW2G Eco-POWER METER
When wiring the main unit and the current transformer (CT) and setting the basic setting after power on,
you can measure the power
The basic setting of MODE1 is necessary to measure.
In order to use the other functions, the settings of the each parameter are necessary.
Check alarm
output
Check measured
data via
communication
device
What to do
Measure Power
Mount / Connection
Settings
Count pulse
output from
other device
Output Alarm
Wire the main unit
Connect the current transformer (CT)
Wire output
line
Collect data
via RS485
Wire
communication
line
Wire input
line
Power on the main unit
Set the parameter for
pulse measurement
Check measured
data with power
monitoring mode
Set alarm
output
(MODE1)
Check count value
with power
monitoring mode
Set
communication
setting
(MODE3)
Set the basic settings (MODE1)
p.33
p.41
p.33
p.42
How to use
6.2
6.2
5.2
7
3
3
3
3
3
Update
the firmware
Check
the software
version
4.3.4
Check how to
update 8

【KW2G-H (SD card type)】
Basic setting to measure by KW2G-H Eco-POWER METER
When wiring the main unit and the current transformer (CT) and setting the basic setting after power on,
you can measure the power
The basic setting of MODE1 is necessary to measure.
In order to use the other functions, the settings of the each parameter are necessary.
*Be sure to set calendar timer (clock) and
initialize memory of main unit before measuring.
After measuring,
insert
SD memory card
Check log data
with option mode
Check alarm
output
Check measured
data via
communication
device
What to do
Measure Power
Mount / Connection
Settings
Count pulse
output from
other device
Output Alarm
Log data
Read out
log data
Wire the main unit
Connect the current transformer (CT)
Wire output
line
Collect data
via RS485
Prepare
SD memory
card
Wire
communication
line
Wire input
line
Power on the main unit
Set calendar timer and initialize memory of main unit (＊) (MODE4･5)
Set the parameter for
pulse measurement
Set log
setting
(MODE4)
Check measured
data with power
monitoring mode
Set alarm
output
(MODE1)
Check count value
with power
monitoring mode
Set
communication
setting
(MODE3)
Set the basic settings (MODE1)
Set log
setting
(MODE4)
p.33
p.44
p.33
p.42
p.44
p.44
How to use
6.2
6.2
6.4
5.2
5.5
7
3
3
3
3
3
Update
the firmware
Check
the software
version
4.3.4
Check how to
update
8
p.41

Cautions for Your Safety
Read the manual carefully before installing, running and maintenance for proper operation.
Before using, master the knowledge of the equipment, safety information and all of other
notes.
This manual uses two safety flags to indicate different levels of danger.
WARNING A handling error could cause serious physical injury to an
operator and in the worst case could even be fatal.
●Always take precautions to ensure the overall safety of your system, so that
the whole
system remains safe in the event of failure of this product or other external factor.
●Do not use this product in areas with inflammable gas. It could lead to an explosion.
●Exposing this product to excessive heat or open flames
could cause damage to the
lithium battery or other electronic parts.
CAUTION A handling error could cause serious physical injury to an operator
or damage to the equipment.
●To preven
t abnormal exothermic heat or smoke generation, use this product at the
values less than the maximum of the characteristics and performance that are assured
in these specifications.
●Do not dismantle or remodel the product. It could lead to abnormal exothermic heat or
smoke generation.
●Do not touch the terminal while turning on electricity. It could lead to an electric shock.
●Use the external devices to function the emergency stop and interlock circuit.
●Connect the wires or connectors securely. The loose connection might cause abnormal
exothermic heat or smoke generation.
●
Do not allow foreign matters such as liquid, flammable materials, metals to go into the
inside of the product. It might cause exothermic heat or smoke generation.
●Do not undertake construction (such as connection and disconnection) while the power
supply is on.
●Do not use at secondary side circuit of inverter. It might cause exothermic
heat or
damage.
Copyright and trademark
●Panasonic Industrial Devices SUNX Co., Ltd. owns the copyright of this manual.
●We stiffly refuse the reproduction of without permission from this manual.
●Modbus Protocol is a communication protocol that the Modicon Inc. developed for PLC.
●O
ther company names and the product names are the trademarks or registered
trademarks of each company.

Introduction
Thank you very much indeed for purchasing
‘KW2G Eco-POWER METER’.
In this manual, we explain the usage of
‘KW2G Eco-POWER METER’ in detail.
Please use it correctly after understanding the content
enough.

Table of Contents
Chapter 1 Unit’s Outline.............................................................................................................................1
1.1 Unit’s Name and Model Numbers............................................................................................................ 1
1.2 Combination devices................................................................................................................................ 1
1.3 Firmware.................................................................................................................................................. 2
1.4 Option ...................................................................................................................................................... 3
1.5 Other tools ............................................................................................................................................... 3
1.6 Measurement items ................................................................................................................................. 4
Chapter 2 Parts Name and Working..........................................................................................................5
2.1 Parts Name.............................................................................................................................................. 5
2.2 Key’s Functions........................................................................................................................................ 7
Chapter 3 Installation .................................................................................................................................8
3.1 Measured-circuit ...................................................................................................................................... 8
3.2 Connection between the main unit and the expansion unit..................................................................... 8
3.3 DIN rail mounting..................................................................................................................................... 9
3.4 Terminal arrangement ........................................................................................................................... 10
3.4.1 Main unit (common to AKW2010G and AKW2020G) .................................................................. 10
3.5 Wiring Diagram...................................................................................................................................... 11
3.5.1 In case of using only main unit..................................................................................................... 11
3.5.2 In case of using main unit and connected expansion units.......................................................... 13
3.5.3 In case of using simple measuring mode..................................................................................... 16
3.6 How to attach the Current Transformer (CT)......................................................................................... 17
3.7 For input connection .............................................................................................................................. 18
3.8 For Output connection ........................................................................................................................... 20
3.9 RS485 communication........................................................................................................................... 20
3.10 Backup battery (only for KW2G-H SD card type) ................................................................................ 22
3.11 Low Voltage Directive.......................................................................................................................... 23
Chapter 4 Settings....................................................................................................................................24
4.1 Setting for KW2G main unit and Expansion unit (power measurement)............................................... 24
4.2 Setting for KW2G-H main unit SD card type and Expansion unit (power measurement)..................... 28
4.3 Setting Mode Explanation for Main unit and Expansion unit (power measurement)............................. 33
4.3.1 Mode 1.......................................................................................................................................... 33
4.3.2 Mode 2.......................................................................................................................................... 41
4.3.3 Mode 3.......................................................................................................................................... 42
4.3.4 Mode 4.......................................................................................................................................... 44
4.3.5 Mode 5.......................................................................................................................................... 46
4.3.6 Remove SD memory card *Only KW2G-H................................................................................... 47
Chapter 5 Various Functions....................................................................................................................48
5.1 LOCK mode........................................................................................................................................... 48
5.2 Pulse output function ............................................................................................................................. 48
5.2.1 Output depends on integrated electric power .............................................................................. 48
5.2.2 Instantaneous electric power alarm ............................................................................................. 48
5.2.3 Current alarm................................................................................................................................ 48
5.2.4 Stand-by power alarm.................................................................................................................. 48
5.2.5 Output depends on count value ................................................................................................... 48
5.2.6 General purpose output................................................................................................................ 49
5.2.7 Error alarm.................................................................................................................................... 49
5.3 Counter function..................................................................................................................................... 49
5.4 General-purpose output function........................................................................................................... 50
5.5 Hour meter function ............................................................................................................................... 51
5.6 Log data writing function........................................................................................................................ 52
5.6.1 In case that SD memory card is always inserted to card slot ...................................................... 52
5.6.2 In case that you insert SD memory card...................................................................................... 53
5.6.3 Unit memory................................................................................................................................. 55
5.6.4 Format for written file.................................................................................................................... 56
5.6.5 File name and Saved folder ......................................................................................................... 59
5.6.6 Logging data................................................................................................................................. 61

Chapter 6 Display of each Value..............................................................................................................62
6.1 Working of Monitor Display.................................................................................................................... 62
6.1.1 KW2G Main unit, Expansion unit (Power measurement)............................................................. 62
6.1.2 KW2G-H Main unit SD card type, Expansion unit (Power measurement)................................... 67
6.2 Display of each measurement value...................................................................................................... 72
6.3 Display for power monitoring mode....................................................................................................... 72
6.3.1 Integrated electric power.............................................................................................................. 72
6.3.2 Instantaneous electric power........................................................................................................ 73
6.3.3 Current.......................................................................................................................................... 74
6.3.4 Voltage ......................................................................................................................................... 75
6.3.5 Electricity Charge ......................................................................................................................... 76
6.3.6 Carbon dioxide conversion value................................................................................................. 76
6.3.7 Power factor ................................................................................................................................. 77
6.3.8 Frequency..................................................................................................................................... 77
6.3.9 Hour meter.................................................................................................................................... 78
6.3.10 Counter / Pulse input status....................................................................................................... 80
6.4 Display for option mode *only KW2G-H SD card type...................................................................... 81
6.4.1 Calendar/Timer............................................................................................................................. 81
6.4.2 Daily integrated electric power (kWh) .......................................................................................... 82
6.4.3 Hourly integrated electric power (kWh)........................................................................................ 83
6.5 Other indication...................................................................................................................................... 85
6.5.1 Indication while communication.................................................................................................... 85
6.5.2 Error indication ............................................................................................................................. 85
Chapter 7 Communication........................................................................................................................86
7.1 Communication Procedures .................................................................................................................. 86
7.2 Communication timing ........................................................................................................................... 86
7.3 MEWTOCOL Communication................................................................................................................ 87
7.3.1 Overview of MEWTOCOL-COM (RS485, USB)........................................................................... 87
7.3.2 Data Register List (MEWTOCOL)................................................................................................ 88
7.3.3 Error Codes.................................................................................................................................. 94
7.3.4 Command..................................................................................................................................... 94
7.4 MODBUS (RTU) Communication.......................................................................................................... 96
7.4.1 Overview of MODBUS (RTU)....................................................................................................... 96
7.4.2 Data Register List (MODBUS communication) ............................................................................ 99
7.5 Status................................................................................................................................................... 108
Chapter 8 How to update the firmware..................................................................................................109
8.1 Prepare Eco-POWER METER to update ............................................................................................ 109
8.2 Update the firmware using KW Version Upgrade Tool........................................................................ 109
Chapter 9 Specifications ........................................................................................................................114
9.1 Main unit, Expansion unit (power measurement)................................................................................ 114
9.2 Measurement....................................................................................................................................... 115
9.3 Output Specifications........................................................................................................................... 116
9.4 Communication Specifications............................................................................................................. 117
9.5 Main Unit Memory Specifications (only KW2G-H SD card type: AKW2020G).................................... 118
9.6 External Memory Specifications (only KW2G-H SD card type: AKW2020G)...................................... 119
9.7 Self-diagnostic function........................................................................................................................ 120
9.8 Power Failure Memory......................................................................................................................... 120
9.9 Applicable standard ............................................................................................................................. 120
9.10 Dedicated Current Transformer Specifications.................................................................................. 121
Chapter 10 Mounting..............................................................................................................................122
10.1 Dimensions........................................................................................................................................ 122
10.1.1 KW2G Main unit ....................................................................................................................... 122
10.1.2 KW2G-H SD card type Main unit.............................................................................................. 123
10.1.3 Expansion unit (power measurement) ..................................................................................... 124

Cautions before using
■
Installation environment
◇
Do not use the Unit in the following environments.
・Where the unit will be exposed to direct sunlight and where the ambient temperature is outside
the range of -10 to 50 °C.
・Where the ambient humidity is outside the range of 30 to 85 % RH (at 20℃, non-condensing)
and where condensation might occur by sudden temperature changes
・Where inflammable or corrosive gas might be produced
・Where the unit will be exposed to excessive airborne dust or metal particles
・Where the unit will be exposed to water, oil or chemicals
・Where organic solvents such as benzene, paint thinner, alcohol, or strong alkaline solutions
such as ammonia or caustic soda might adhere to the product
・Where direct vibration or shock might be transmitted to the product, and where water might wet
the product
・Where the place near high-voltage cable, high-voltage device, power line, power device.
・Where the place near a machinery with transmission function such as amateur radio.
・Where the place near a machinery which occurs the big switching serge
◇
Please use the Unit according to the specifications described in this manual. Otherwise, it
may malfunction or cause fire and an electric shock.
・Connect to the power supply in compliance with the rating.
・Refer to the wiring diagram to ensure proper wiring for the power supply, input and output.
・Do not perform wiring or installation with a live line. It may also lead to circuit burnout or fire by
way of the secondary CT side opening.
■
Installation
・Eco-POWER METER is designed to be used in a control panel.
・The power supply terminal and voltage input terminal of the main unit is common. Therefore if
additional noise effects the power supply line, incorrect measurements may result.
・Installation and wiring must be performed by expert personnel for electrical work or electric
piping.
・Do not add an excess power to the display. It might break the inner liquid crystal.
■
As to measurement
･If there is some distortion by harmonic or waveform, it may not measure correctly.
Please check with the actual system before adopts it.
・It might not measure an instantaneous current such as an inrush current or an welding machine.
・When measuring the below loads, it might not satisfy with the accuracy guarantee.
Out of rating current, Load with low power factor,
Load with winding current, Load with ferromagnetic field
・Power factor operation is a method assuming balanced load. The error might be big when it
measures unbalanced load.
・
It takes time to update monitor display when many units are connected. However, data
update cycle is not changed.
・
The unevenness will be large when using outside of rated frequency.
In this case, set the shift average frequency big.
■
Static electricity
・Discharge static electricity touching the grounded metal etc. when you touch the unit.
・Excessive static electricity might be generated especially in a dry place.
■
Cleaning
・Wipe dirt of the main unit with soft cloth etc. When thinner is used, the unit might deform or be
discolored.

■
Power supply
・Connect a breaker to the voltage input part for safety reasons and to protect the device.
The breaker that connects to the voltage input part must arrange at the position easily reached,
and display shows it is the breaker of the equipment.
・Do not turn on the power supply or input until all wiring is completed.
■
Before power on
Please note the following points when turning on power at the first time.
・Confirm there are neither wiring rubbish nor especially an electrical conduction when installed.
・Confirm neither the power supply wiring, the I/O wiring nor the power-supply voltage are wrong.
・Tighten the installation screw and the terminal screw surely.
・Use an electric wire applicable to the rated current.

KW2G / KW2G-H Eco-POWER METER
1
Chapter 1 Unit’s Outline
KW2G Eco-POWER METER is the wattmeter that can measure electric power, current, voltage, PF and
so on with combination of one main unit and expansion units (power measurement, power
measurement + pulse output).
By connecting main unit and expansion unit (power measurement, power measurement + pulse output),
it can measure up to 8-circuit (16-circuit of single-phase two-wire system).
By connecting expansion unit of pulse input type, it can measure pulse signal from a sensor.
By connecting expansion unit of analog input type, it can measure digital conversion value
(voltage/current) from a sensor.
1.1 Unit’s Name and Model Numbers
●Main unit
Product name
CT Connector color
Model No.
Log function
KW2G Eco-POWER METER
Main unit
Blue
AKW2010GB
Not available
White
AKW2010G
KW2G-H Eco-POWER METER
Main unit SD card type
Blue
AKW2020GB
Available
White
AKW2020G
Note) AKW20x0GB and AKW20x0G (without B) are not compatible.
Please be aware that only AKW20x0GB and AKW4x0xB (CT) can be used together.
Connecting method (common)
・
Power supply terminal
M3.5 ＋ screw
(Voltage input terminal)
・Pulse I/O terminal M3＋screw
・ RS485 communication terminal M3＋screw
・
Current transformer(CT)
Connector
・
USB communication
Connector
●Expansion unit
Product name
Model No.
Connecting method
Expansion unit
(Power measurement)
AKW2110GB
(connector color; Blue)
Current transformer (CT)
Connector
*Connect to main unit with the connector.
AKW2110G
(connector color; White)
Note)
It is impossible to measure by only the expansion unit.
Be sure to connect expansion units to the main unit.
AKW2110GB and AKW2110G are not compatible.
Please be aware that only AKW2110GB and AKW48xxB (CT) can be used together.
1.2 Combination devices
Product name
Model No.
Connecting method
Expansion unit
(Power measurement
+ Pulse output)
AKW2160GB
(connector color; Blue)
Current transformer (CT)
Connector
Pulse output terminal M3＋screw
AKW2160G
(connector color; White)
*Connect to main unit with the connector.
Expansion unit
(Pulse input) AKW2152G Pulse input terminal M3＋screw
*Connect to main unit with the connector.
Expansion unit
(Analog input) AKW2182G Analog input terminal M3＋screw
*Connect to main unit with the connector.
Note) AKW2160GB and AKW216 0G are not compatible.
Please be aware that only AKW2160GB and AKW4x0xB (CT) can be used together.
*In this manual, we explain the usage of ‘KW2G Main unit’, ‘KW2G-H Main unit’ and ‘Expansion
unit (Power measurement)’.

KW2G / KW2G-H Eco-POWER METER
2
1.3 Firmware
●Combination software using the expansion unit
Expansion unit firmware Firmware of AKW2010G Firmware of AKW2020G
AKW2110G Ver.1.00 or later Ver.1.00 or later Ver.1.00 or later
AKW2152G Ver.1.10 or later Ver.1.02 or later Ver.1.00 or later
AKW2182G Ver.1.10 or later Ver.1.02 or later Ver.1.00 or later
AKW2160G Ver.1.20 or later Ver.1.04 or later Ver.1.01 or later
●For using the additional functions
Functions
Model
number
-Check the pulse input
condition with the main
unit or communication
-Set pulse output width
-Display an integrated
electric power with unit of
0.001kWh
-General-purpose output
function
-Eject SD memory card
-Error alarm output
AKW2010G Ver.1.04 or more Ver.1.05 or more Ver.1.06 or more
AKW2020G Ver.1.01 or more Ver.1.02 or more Ver.1.03 or more
AKW2110G ―Ver.1.04 or more Ver.1.05 or more
AKW2160G Ver.1.00 or more Ver.1.01 or more Ver.1.02 or more
AKW2152G Ver.1.01 or more ――
AKW2182G ―――
Functions
Model
number
-Hour meter
AKW2010G Ver.1.10 or more
AKW2020G Ver.1.10 or more
AKW2110G Ver.1.05 or more
AKW2160G Ver.1.02 or more
AKW2152G Ver.1.01 or more
AKW2182G ―

KW2G / KW2G-H Eco-POWER METER
3
1.4 Option
●Dedicated current transformer clamp-on type (CT)
Product name
Rated
primary current
Connector
color
Model No
Dedicated current transformer for 5A/50A 5A / 50A
Blue
AKW4801B
White
AKW4801C
Dedicated current transformer for 100A 100A
Blue
AKW4802B
White
AKW4802C
Dedicated current transformer for 250A 250A
Blue
AKW4803B
White
AKW4803C
Dedicated current transformer for 400A 400A
Blue
AKW4804B
White
AKW4804C
Dedicated current transformer for 600A 600A
Blue
AKW4808B
White
AKW4808C
Note) AKW480xB and AKW480xC are not compatible.
●Dedicated current transformer through type (CT)
Product name
Rated primary
current
Connector
color
Model No
Dedicated current transformer for 50A/100A 50A / 100A
Blue
AKW4506B
White AKW4506C
Dedicated current transformer for 250A/400A 250A / 400A Blue AKW4507B
White
AKW4507C
Dedicated current transformer for 600A 600A
Blue
AKW4508B
White
AKW4508C
Note) AKW450xB and AKW450xC are not compatible.
●Others
Product name
Model No
Mounting rail AT8-DLA1
Fastening plate ATA4806
Battery (included with AKW2020G) AFPG804 *1
Extension cable for CT 3m AKW4703
Extension cable for CT 5m AKW4705
*1 only for KW2G-H SD card type
1.5 Other tools
Product name Functions Model No
Data collection software
KW Monitor ・Monitoring and logging the
measured values.
Download from our
website.
Free of charge
Power display tool
KW View ・It makes graph by using data from
Eco-POWER METER
Download from our
website.
Free of charge
Eco-POWER METER Version Upgrade Tool
KW Version Upgrade Tool
・
You can upgrade the farmware of
main unit and expansion unit.
・USB driver is included.
Download from our
website.
Free of charge
Note) Members registration is required to download.

KW2G / KW2G-H Eco-POWER METER
4
1.6 Measurement items
Item
Unit
Data range
Integrated electric power (Active) *1 kWh/
MWh
･6-digit display
0.00 to 9999.99MWh
(minimum unit: 0.01kWh)
・9-digit display
0.00 to 9999999.99kWh
(minimum unit: 0.01kWh)
0.000 to 999999.999kWh (minimum unit: 0.001kWh)
Instantaneous
electric power
Active *2 kW -9999.99 to 0.000 to 9999.99
Reactive *3 kvar -9999.99 to 0.00 to 9999.99
Apparent kVA 0.00 to 9999.99
Current R-current A 0.000 to 6000.00 N/S-current A 0.000 to 6000.00 (calculated value)
T-current A 0.000 to 6000.00
Voltage R(RS)-voltage V 0.0 to 9999.9 S(RT)-voltage V 0.0 to 9999.9 (calculated value)
T(TS)-voltage V 0.0 to 9999.9
Electricity charge *4 0.00 to 999999
Conversion
value
Carbon dioxide kg-CO20.00 to 999999
Power Factor *2
-1.00 to 0.00 to 1.00
(without identify leading phase and lagging phase)
Frequency *5 Hz 47.5 to 63.0
Hour meter
*6
OFF-time
Hour 0 to 99999.9
ON-time 1
ON-time 2
Maintenance time
Actual work time
Ratio of ON-time 1 % 0.0 to 100.0
Ratio of ON-time 2
Pulse counter *5 *7 0 to 999999
*1 KW2G can measure regeneration electric power.
Integrated electrical power is not integrated (not subtracted) when detecting regeneration power.
*2 While detecting regeneration electric power, minus is displayed on instantaneous active power and
power factor.
*3 It determines pulse or minus of instantaneous reactive power by the input measuring voltage and the
input measuring current.
When harmonics or a wave pattern is warped, it may not determine correctly.
*4 Eco-POWER METER is designed chiefly to manage saving energy.
It is neither intended nor can it be legally used for billing.
*5 Frequency and pulse counter are only for main unit.
*6 Expansion unit (Analog input) doesn’t have the hour meter function.
With expansion unit (Pulse input), maintenance time and actual work time can be measured.
Maintenance time by using pulse input can’t be measured with expansion unit (Power measurement)
and expansion unit (Power measurement + Pulse outout).
For ratio of ON-time1 and ratio of ON-time2, it uses measuring value inside every 1 sec., therefore it
may be different when you compare with OFF-time, ON-time1, ON-time2, maintenace time and
actual work time.
Hour meter function can be used only with main unit and one expansion unit.
*7 Displayed digit of pulse counter differs according to the pre-scale set by pre-scale setting mode.

KW2G / KW2G-H Eco-POWER METER
5
Chapter 2 Parts Name and Working
2.1 Parts Name
Front view <Main unit><Expansion unit (Power meter)>
Operating power supply
(Measured voltage input)
(M3.5)
Liquid crystal display
MODE key
SET key
ITEM/△key
USB port
Pulse I/O terminal(M3)
RS485 communication
terminal (M3)
Connector for
current transformer(CT)
<Main unit SD card type>
Operating power supply
(Measured voltage input)
(M3.5)
Battery cover
Liquid crystal display
MODE key
SET key
ITEM/△key
SD card slot
USB port
Pulse I/O terminal(M3)
RS485 communication
terminal (M3)
Connector for
current transformer(CT)

KW2G / KW2G-H Eco-POWER METER
6
Side view
<Main unit> <Expansion unit>
Connector label
Peel off before connecting
expansion unit
Do not peel off when not
connecting.
Hook: 2 points
Push the hooks into the unit to fix the expansion unit.

KW2G / KW2G-H Eco-POWER METER
7
②
③
④
①
⑤
⑥
⑦
⑧
<Display>
①LOCK indicator
Key operation is invalid while lighting.
②TX/RX indicator
Lighting when communication
③OUT indicator
Lighting when pulse output
④Unit number indicator
M: Main unit
1 to 7: Expansion unit
⑤Setting mode indicator
⑥Each measurement value
<Display (SD card type)>
①LOCK indicator
Key operation is invalid while lighting.
②TX/RX indicator
Lighting when communication
③OUT indicator
Lighting when pulse output
④Unit number indicator
M: Main unit
1 to 7: Expansion unit
⑤Setting mode indication
⑥Each value indicator
⑦LOG indicator
Lighting while logging
⑧SD indicator
Lighting while inserting SD memory card
2.2 Key’s Functions
<MODE> ・Shift unit number to display
<MODE>
(continuous press 3-sec)
・Use to shift setting mode
<SET> ・
Use to set each value entered
・Reset stand-by alarm while output the alarm
(only available while output the stand-by alarm)
<SET>
(continuous press 3-sec) ・All keys locked
・Release lock mode while in lock mode
<ITEM/△>・To select measured value display
・To select setting value (While monitoring)
(While setting mode)
<SET> and <ITEM/△>・To select measured value display
・
To select setting value
(While monitoring)
(While setting mode)
<ITEM/△>
(continuous press 3-sec)
・Shift measured items to display
(Instantaneous electric power, current, voltage)
<SET> and <MODE>
(continuous press 3-sec)
・To reset the measured value
②
③
④
①
⑤
⑥

KW2G / KW2G-H Eco-POWER METER
8
Chapter 3 Installation
3.1 Measured-circuit
・It is not impossible to use to measure several loads by different strain power supply.
・Each unit (main unit, expansion unit (power measurement, power measurement + pulse output)) can
measure 2-circuit of single-phase two-wire system, and 1-circuit of single-phase three-wire system or
three-phase three-wire system. Each unit can be used with different phase and wire system. However
be sure to check the wiring carefully.
・It is impossible to measure by only the expansion unit. Connect expansion units to main unit.
Up to 7 expansion units are connected to 1 main unit. You can use with the combination of power
measurement, power measurement + pulse output, pulse input and analog input as expansion units.
*Power source system
・Power source system is the electrical power system from one power source (normally one
transformer).
･KW2G can measure 1-system max. 16-circuits of 1P2W system and 1-system max. 8-circuit of 1P3W
and 3P3W system by connecting a main unit and expansion units (power measurement, power
measurement + pulse output).
・In order to measure several systems, it is necessary to use one main unit for each system.
3.2 Connection between the main unit and the expansion unit
・Turn off the power of main unit when connecting expansion units.
・Peel off connector label on the side before connecting.
(Do not peel off connector labels when not connecting.)
・It expands by connecting each male connector to female connector. Female connector is on the other
side of male connector.
・After connecting, push the hooks into the unit to fix the expansion unit.
・Up to 7 expansion units can be connected per one main unit.
Note) Communication will be stopped or the measurement data will be lost when the units are
removed or connected while turn on power.
Hook Hook Hook Connector label
Expansion connector (male)

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Close-up of Close-up of
DIN hook position DIN hook position
Fig. 1 Fig. 2
3.3 DIN rail mounting
Connect all expansion units to the main unit before mounting DIN rail, then mount all connected units to
DIN rail.
Mount
1) Hang the unit on DIN rail.
2) Push it till making click sound and mount.
Note) Check the position of DIN hook (Fig.1) before mounting.
When several expansion units are connected and mounted to DIN rail, moving the hooks
lower (Fig.2) makes mounting easy. After mounting, return to the position of Fig.1.
<Back of main unit> <Back of expansion unit>
Remove
1) Insert minus driver etc. to DIN hook and displace down below.
2) Lift it in the direction of the arrow and remove it.

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3.4 Terminal arrangement
Be sure to wire correctly according to the terminal arrangement and wiring
diagrams. After completing wiring, be sure to attach the terminal cover for
safety reasons.
3.4.1 Main unit (common to AKW2010G and AKW2020G)
No. Function Screw
Top
①P1 Measured voltage input
P1-P0 common to operating
power supply M3.5
②P0
③P2
④NC Vacant
Mid
⑤＋Pulse output
M3
⑥－
⑦＋Pulse input
⑧－
Bottom ⑨＋RS485
⑩－
⑪E
The input voltage to each terminal is as follows.
Terminal
Phase and wire
Terminal
Input voltage
Measured
voltage input
Single-phase,
two-wire ①－②
(P1-P0)
100-240VAC (100-240V～) (Line voltage)
Single-phase,
three-wire ①－②－③
(P1-P0-P2)
100-120VAC
(100-120V～：3W) (Phase voltage)
Three-phase,
three-wire ①－②－③
(P1-P0-P2)
100-240VAC
(100-240V 3～) (Line voltage)
Caution for Wiring
1) Terminal fastening torque should be 0.5 to 0.6N･m for M3 screw and should be 0.8 to 1.0N･m for
M3.5 screw. In case of using a crimping terminal, use it with insulating sleeve applicable to M3 screw
or M3.5 screw.
2) To protect the device, it is necessary to install power switch and circuit breaker in the power supply
circuit. And this has no built-in power switch, circuit breaker or fuse for measured voltage input parts.
Therefore it is necessary to install them in the circuit near this unit.
3) We recommend a wire with the cross section of 0.75 to 1.25mm2 for power supply line and
measured voltage input line.
4) Use with 10m or less of the input line and 100m or less of the output line.
5) Use flame-resistant cable for each wiring.
<M3.5 screw> width: 6.6mm or less
<M3 screw> width: 5.8mm or less
①②③④
⑤⑥⑦⑧
⑨⑩⑪

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3.5 Wiring Diagram
3.5.1 In case of using only main unit
Please connect a breaker (3 to 15A) to the power supply (voltage input) part for safety reasons and to
protect the device.
Single-phase two-wire system
◆When measuring a load with rated input voltage
One CT is needed to measure one load.
The below shows that it measures 2-circuit using 2 CTs connected to connectors of unit.
Note)
(1) When wiring CT, wire correctly according to this, K for power supply side and L for load side.
(2) 2 CTs should be same.
◆When measuring a load with exceed input voltage.
Voltage transformer (VT) is needed when you measure a load with over rated input voltage.
Use VT, its secondary side rating is 110V.
Grounding the secondary side of VT and CT is not necessary with low-voltage circuit.
P1 P0 P2
Breaker
VT
440V 110V
Power supply side
1 2
Use P1 and P0 for measuring
1-circuit of 1P2W.
Short P2 and P1 for measuring 2-circuit.