Panasonic KW2M-A User manual

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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.
●
Apply appropriate personal protective equipment (PPE) and follow safe electrical work
practices. In the USA, see NFPA 70E.
●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.
●Do not open the secondary side of CT during power on the primary side current.
It might cause electric shock or CT breakdown.
CAUTION
A handling error could cause serious physical injury to an operator
or damage to the equipment.
●To prevent 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.
●Never remove the terminal block under applying current to load.
It might cause electric shock or CT breakdown.
●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
and Modbus is the registered trademark of Schneider Electric.
●O
ther company names and the product names are the trademarks or registered
trademarks of each company.
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Introduction
Thank you very much indeed for purchasing
KW2M-A Eco-POWER METER.
In this manual, we explain the usage of KW2M-A
Eco-POWER METER in detail.
Please use it correctly after understanding the content
enough.
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Table of Contents
Cautions before using ............................................................................................................................... ⅰ
Chapter 1 Unit’s Outline ............................................................................................................................. 1
1.1 Model Number ......................................................................................................................................... 1
1.2 Measurement outline ............................................................................................................................... 1
1.3 Measurement items ................................................................................................................................. 2
Chapter 2 Parts Name and Working .......................................................................................................... 4
2.1 Parts Names ............................................................................................................................................ 4
2.2 Key’s functions ......................................................................................................................................... 4
Chapter 3 Wiring......................................................................................................................................... 5
3.1 Main unit terminal arrangement ............................................................................................................... 5
3.2 Measured-circuit ...................................................................................................................................... 6
3.3 Connection between the main unit and the expansion unit ..................................................................... 7
3.4 Wiring Diagrams ...................................................................................................................................... 8
3.5 How to attach the Current Transformer (CT) ......................................................................................... 10
3.6 For Input Connection ............................................................................................................................. 12
3.7 For Output Connection .......................................................................................................................... 12
3.8 RS485 Communication .......................................................................................................................... 13
3.9 Low Voltage Directive ............................................................................................................................ 14
3.10 Symbol List .......................................................................................................................................... 15
Chapter 4 Settings .................................................................................................................................... 16
4.1 Setting Flow ........................................................................................................................................... 20
4.2 Password entry ...................................................................................................................................... 22
4.3 Password initialize ................................................................................................................................. 23
4.4 How to Set by Keys................................................................................................................................ 24
4.4.1 Settings for power measurement ................................................................................................. 24
4.4.2 Settings for communication (RS485) ........................................................................................... 25
4.4.3 Settings for communication (Ethernet) ......................................................................................... 27
4.4.4 Settings for optional functions ...................................................................................................... 29
4.4.5 Password setting .......................................................................................................................... 32
4.4.6 Confirmation window .................................................................................................................... 33
4.5 How to Set by Web browser .................................................................................................................. 34
4.5.1 Setting item................................................................................................................................... 34
4.5.2 Settings for Power Measurement ................................................................................................. 35
4.5.3 Settings for Demand and Power Rates ........................................................................................ 37
4.5.4 Settings for Pulse Input ................................................................................................................ 39
4.5.5 Settings for Pulse Output ............................................................................................................. 40
4.5.6 Settings for Ethernet and RS485 communication ........................................................................ 43
4.5.7 System setup ................................................................................................................................ 45
Chapter 5 Various Functions .................................................................................................................... 47
5.1 Power quality measurement and logging function ................................................................................. 47
5.2 Pulse output function ............................................................................................................................. 47
5.2.1 Output depends on integral electric power ................................................................................... 47
5.2.2 Stand-by alarm ............................................................................................................................. 47
5.2.3 Under voltage alarm ..................................................................................................................... 47
5.2.4 Over voltage alarm ....................................................................................................................... 47
5.2.5 Power interruption alarm .............................................................................................................. 47
5.2.6 Under current alarm ..................................................................................................................... 47
5.2.7 Current alarm................................................................................................................................ 47
5.2.8 Power alarm ................................................................................................................................. 48
5.2.9 Other alarms ................................................................................................................................. 48
5.2.10 Output depends on count value ................................................................................................. 48
5.2.11 Level output ................................................................................................................................ 48
5.3 Counter function ..................................................................................................................................... 48
5.4 Demand function .................................................................................................................................... 49
5.4.1 Block interval demand .................................................................................................................. 49
5.4.2 Current Demand ........................................................................................................................... 50
5.4.3 Max. demand value ...................................................................................................................... 50
5.4.4 Demand alarm output ................................................................................................................... 50
5.4.5 Working at power failure and at recovery ..................................................................................... 50
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Chapter 6 Display of each Value .............................................................................................................. 51
6.1 Working of Monitor display .................................................................................................................... 51
6.2 Working of Monitor Display .................................................................................................................... 52
6.2.1 Single-phase two-wire system ...................................................................................................... 52
6.2.2 Single-phase three-wire system ................................................................................................... 54
6.2.3 Three-phase three-wire system .................................................................................................... 56
6.2.4 Three-phase four-wire system ...................................................................................................... 58
6.2.5 Instantaneous power .................................................................................................................... 60
6.2.6 Total integral power ...................................................................................................................... 61
6.2.7 Total integral export power ........................................................................................................... 61
6.2.8 Current .......................................................................................................................................... 62
6.2.9 Voltage ......................................................................................................................................... 62
6.2.10 Power factor ............................................................................................................................... 63
6.2.11 Frequency................................................................................................................................... 63
6.2.12 Current unbalance ...................................................................................................................... 63
6.2.13 Voltage unbalancing ................................................................................................................... 63
6.2.14 Current THD ............................................................................................................................... 64
6.2.15 Voltage THD ............................................................................................................................... 64
6.2.16 Current n-order Harmonics ......................................................................................................... 64
6.2.17 Voltage n-order Harmonics ........................................................................................................ 64
6.2.18 Pulse Input Value ....................................................................................................................... 65
6.2.19 Conversion value for integral active power ................................................................................ 65
6.2.20 Conversion value for integral export power ................................................................................ 66
6.3 Working of Logging Mode ...................................................................................................................... 67
6.3.1 Max. demand value ...................................................................................................................... 67
6.4 Working of Demand Mode ..................................................................................................................... 68
6.4.1 Block Interval Demand (Sliding block、fixed block) ...................................................................... 68
Chapter 7 Specifications .......................................................................................................................... 71
7.1 General specification (for main unit and expansion unit)....................................................................... 71
7.2 Measurement Specifications .................................................................................................................. 72
7.3 Output Specifications (only for main unit) .............................................................................................. 73
7.4 Input Specifications (only for main unit) ................................................................................................. 74
7.5 Demand monitor and control specifications (common to 9, 10) ............................................................ 75
7.6 Communication Specifications ............................................................................................................... 75
7.7 Self-diagnostic ....................................................................................................................................... 76
Chapter 8 Mounting .................................................................................................................................. 77
8.1 Dimensions ............................................................................................................................................ 77
8.1.1 Main unit ....................................................................................................................................... 77
8.1.2 Expansion unit .............................................................................................................................. 77
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Cautions before using
■
About this product
Eco-POWER METER is designed chiefly to manage saving energy.
It is neither nor can it be legally used for billing.
■
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.
・Use the wire that conforms to the rated current.
・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.
・If the 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.
・Although the case is made from fireproof resin, do not mount it next to flammable materials. Also,
avoid placing it directly on top of materials that catch fire easily.
・If the operating power supply surge exceeds the following value, the internal circuit could be
destroyed, so be sure to use a surge absorption element.
Surge voltage
6,000V
Standard surge waveform
The above value is the surge-voltage
resistance at ± (1.2/50) μs of
single-polarity full-wave voltage.
0
1.2
50
30
50
90
100
Peak
Surge voltage (%)
Time (μs)
Surge wave form
[± (1.2/50) μs single-polarity full-wave voltage]
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・External noise up to the level shown below is treated as noise voltage, but levels higher than this
could lead to malfunctioning or damage to the internal circuit. Although the case is made from
fireproof resin, do not mount it next to flammable materials.
Between operating power supply terminals
Noise voltage
1,500V
Noise wave form (noise simulator)
Rise time: Pulse width: 1 μs, 50 ns
Polarity: Cycle: 10 ms
Note) Accurate measurement may not be possible if excessive noise gets added to the input line.
･This product is designed to be used only with our options.
Options from other companies are not compatible.
■
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.
・If the voltage to be measured is not the rated frequency (commercial frequency), it may take
time to stabilize THD (total harmonic distortion).
■
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.
■
Before change the setup
Set the password carefully.
In order to avoid unexpected change the settings, it can set password. However, if you forget the
password you can’t change the settings.
We recommend you to note the password when you set and change the password.
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■
Precautions on using networks
This product supports various network connections therefore it is likely to be subject to the following
security risks.
1. Leakage and outflow of information via this product
2. Illegal operation by third party with malicious acts
3. Interference and shut down by third party with malicious acts
It is recommended to take network security measures such as below for protecting against these risks
under your responsibility.
・Use this product on the network that has been ensuring safety by using firewall
・Check and extermination against the infection of computer viruses and unauthorized program are you
make sure that you have performed regularly
・To protect against unauthorized attacks, set the user name and password, and to limit the users who
can log in.
・Restrict access by user authentication so that authentication information (user name, password) and
network configuration information and equipment inside information is not leak on the network.
・Before you access this product via browser, close other windows.
・After you access this product via browser, close all browsers.
・Change password regularly.
・Do not install the place where it can be disassembled or remodeled easily.
We do not accept liability for the following cases.
1) Guarantee for any kind of damages to the things/products, caused by physical defects of the product.
2) When the other conditions than the ones specified in these specifications exist for handling, storage
and transportation of the product after the delivery.
3) When damage is caused by the unpredictable phenomena with the technique that was practiced
before the product delivery.
4) When damage is caused by natural disasters such as an earthquake, flood, fire, war and artificial
disasters.
5) When necessary countermeasures are not taken to establish a system despite the precautions
described in this specifications.
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KW2M-A Eco-POWER METER
1
Chapter 1 Unit’s Outline
With KW2M-A Eco-POWER METER, electrical power (voltage, current, etc.), power factor, frequency,
etc. are measured using AC voltage and AC current input via one of the following systems:
single-phase two-wire system, single-phase three-wire system, three-phase three-wire system or
three-phase four-wire system.
In addition, it measures harmonics and THD for power quality measurement.
Connecting the expansion unit to the main unit can measure up to 8-circuit (up to 24-circuit of
single-phase 2-wire system). One unit can measure 2-circuit.
■Eco-POWER METER is designed chiefly to manage saving energy. It is neither intended nor
can it be legally used for billing.
1.1 Model Number
Model name Model number
KW2M-A Eco-POWER METER Main unit AKW263100A
KW2M-A Eco-POWER METER
Expansion unit (Power measurement) AKW272100A
* It can’t measure with only the expansion unit. Be sure to use with connecting to main unit.
1.2 Measurement outline
Phase/Wire system
Single-phase two-wire
Single-phase three-wire
Three-phase three wire
Three-phase four-wire
(1P2W)
(1P3W)
(3P3W)
(3P4W)
(common)
Applicable power system 100V system, 200V system, 400V system
Measurement circuit Main unit 1-system 2-circuit
(when measuring 1P2W: 1-system 6-circuit)
Expansion unit 1-system 2-circuit
(when measuring 1P2W: 1-system 6-circuit)
Input measurement voltage 0 to 690VAC *0 to 300V for UL61010-1
Input measurement current 1 to 65,535A
Applicable current sensor Secondary side output: 1A or 5A
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1.3 Measurement items
Item
Unit
Display data range
Instantaneous
power
Active W
-999.99G to 999.99G
Present value
Max. value
Min. value
Reactive var
Apparent VA
Total integral
power
(import)
Active Wh
0.000k to 9999.9P Present value
Reactive varh
Apparent VAh
Total integral
power
(export)
Active Wh 0.000k to 9999.9P Present value
Reactive varh
Current A 0.000 to 99.999k
Present value
Max. value
Min. value
Voltage V 0.00 to 999.99k
Power factor -1.000 to 0.000 to 1.000
Frequency Hz 0.00 to 99.99
Pulse count value 0.000 to 99999999 Present value
Power conversion value 0.000 to 99999999 Present value
* ‘Display data range’ is the range to be able to indicate with the main unit display, it is not a range that
can be measured.
・Power Quality
Item
Display data range
Unbalanced current Each phase 0.00 to 300.00 %
Present value
Max. value
Min. value
Unbalanced voltage Each phase
Current THD
(total harmonic distortion)
Each phase
0.00 to 400.00 % Present value
Voltage THD
(total harmonic distortion)
Each phase
Current harmonics
(2
nd
to 31
st
)
Each phase
Voltage harmonics
(2nd to 31st )
Phase
Line
Hour Meter
ON-time
0.0 to 99999.9 h
OFF-time
Stand-by time
Maintenance time
* If the voltage to be measured is not the rated frequency (commercial frequency), it may take time to
stabilize THD (total harmonic distortion).
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・Demand
Item Unit Display data range
Present demand *1
Active W
0.000k to 999.9M Present value
Max. demand
Reactive var
Apparent VA
Active (export) W
Reactive (export) var
Current A
*Please use this demand function as your standard.
The demand value calculated with this function is not guaranteed.
<Glossary>
Eco-POWER METER defines as below.
THD
(total harmonic
distortion)
Ratio of harmonic distortion (voltage or current) for the fundamental frequency.
Lower the value shows that the distortion is less.
Harmonics
Sinusoidal wave other than fundamental frequency.
It has frequency that is whole-number multiple of the fundamental frequency.
The frequency that has 2 times frequency (half wavelength) is called 2nd-order
harmonics.
Voltage
unbalancing
The different between each phase-voltage due to the load unbalancing.
It is calculated as below.
|Max. (Min.) voltage of all phase
－
average voltage|
×100 (%)
Average voltage
Current
unbalancing
The difference between each-phase current due to the load unbalancing.
It is calculated as below.
|Max. (Min.) current of all phase－average current| ×100 (%)
Average current
Power
interruption
Voltage under 5% of rating is kept 5ms or more,
Under voltage
Set the ratio for the rated voltage and it is used for threshold.
Voltage under the set ratio is kept 5ms or more, it will judge as under voltage.
Under current
Set the ratio for the rated current and it is used for threshold.
Current under the set ratio is kept 5ms or more, it will judge as under current.
Over current
Set the ratio for the rated current and it is used for threshold.
Current over the set ratio is kept 5ms or more, it will judge as over current.
Demand by
IEC61557-12
Based on IEC61557-12 Performance measuring and monitoring devices (PMD)
Sliding block interval
demand
It calculates by measured power via CT with setting interval.
Set power interval by 1 to 60(min.) (every 1-min.). It calculates demand
during latest finished interval and displays.
One interval is started every setting time.
fixed block interval
demand
It calculates by measured power via CT with setting interval.
Set power interval by 1 to 60 (min.) (every 1-min.) It calculates demand
during latest finished interval and displays. After one interval finishes, the
next interval starts.
Current demand
It calculates based on a thermal demand meter.
It measures an average current (current demand) within setting interval and
the max. value is considered as max. current demand.
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Chapter 2 Parts Name and Working
2.1 Parts Names
<Front>
<Bottom view>
2.2 Key’s functions
Key Functions
<MODE>
Measuring mode
Shift to setting mode
Setting mode
Shift to setting confirmation mode and measuring mode
<SET>
Setting mode
Set setting items and setting values
<SET>
(continuous 3-sec)
Measuring mode
Demand mode
All keys locked
Lock mode
Release the lock mode
<SHIFT/∧>
<ITEM/＞>
Measuring mode
Select measuring item to display
Setting mode
Select a setting value
Demand mode
Select demand item to display
<MODE>+<SET>
Measuring mode
Demand mode
Select unit to display
<MODE>+<SHIFT/∧> Measuring mode Shift to demand mode
Demand mode
Shift to measuring mode
●Lock mode
It is the mode makes all keys unable. In this mode, you can not input by any keys.
When you press <SET> continuously for about 3sec., lock mark is displayed.
Press <SET> continuously for about 3sec. again to release Lock mode.
Power supply
terminals
Display
Voltage input
terminals
Operation keys
Indicators
Ethernet port
Left: port 1
Right: port 2
RS485
communication
terminals
Pulse I/O
terminals
Current input
terminals
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Chapter 3 Wiring
Be sure to wire correctly according to the terminal arrangement and wiring diagrams.
Please connect a fuse or a breaker to power supply part for safety reasons and to protect the device.
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.
Do not turn on the power supply or input until all wiring is completed.
3.1 Main unit terminal arrangement
Power supply terminals
Terminal
number
1 2
Functions L + N－
Power supply
Voltage input terminals
Terminal
number
1 2 3 4 5 6 7
Functions
V1 NC V2 NC V3 NC Vn
Measured
voltage vacant
Measured
voltage vacant
Measured
voltage vacant
Measured
voltage
*Do not use NC (vacant) terminals in any purpose.
Current input terminals
Terminal
number
1 2 3 4 5 6 7 8 9 10 11 12
Functions
K L K L K L K L K L K L
CH1(CT1)
CH1(CT2)
CH1(CT3)
CH2(CT1)
CH2(CT2)
CH2(CT3)
Measured current (CH1)
Measured current (CH2)
RS485 communication terminals
Terminal
number
1 2 3 4 5 6
Functions + + - - END END
*Each terminal is connected internal.
Pulse I/O terminals
Terminal
number
1 2 3 4 5 6
Functions + - + - + -
Pulse input
Pulse output (CH1)
Pulse output (CH2)
*It is insulated between OUT1 and OUT2.
The input voltage to each terminal is as follows.
Terminal
Phase and wire system
Terminal No.
Input voltage
Power
supply Single-phase two-wire
1 - 2
(L+ - N
－
)
100-240V AC [100-240V ]
Voltage input terminals
Measured
voltage
input
Single-phase two-wire
1 - 7
(V1-Vn)
0-690VAC [0-690V ] (L-L)
Single-phase three-wire
1 - 5 - 7
(V1-V3-Vn)
0-690VAC [0-690V :3W]
0-345VAC [0-345V :3W]
(L-L)
(L-N)
Three-phase three-wire
1 - 5 - 7
(V1-V3-Vn)
0-690VAC [0-690V 3 ] (L-L)
Three-phase four-wire
1 - 3 - 5 - 7
(V1-V2-V3-Vn)
0-690VAC [0-690V 3 ]
0-398VAC [0-398V 3N ]
(L-L)
(L-N)
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◆Applicable wire (Crimp-type terminal is recommended.)
･Stripping length: 7 to 8mm
・Power supply/Measured voltage
Screw type: M3
Tightening torque: 0.5 to 0.6N･m
Sectional area: single /stranded wire 0.13 to 6mm2(AWG26 to12)
・for 2pcs.
single/stranded wire 2pcs.×0.5 to 2.5mm2 (AWG20 to 12)
・Measured current (CT input)
Screw size: Push IN type
Sectional area: single /stranded wire 0.13 to 1.5mm2(AWG24 to16)
*Use applicable wire according to the measured current.
・RS485 communication
Screw size: Push IN type
Sectional area: single /stranded wire 0.13 to 1.5mm2(AWG24 to16)
*Use shielded wire for RS485 communication.
・Output/Input
Screw size: Push IN type
Sectional area: single /stranded wire 0.13 to 1.5mm2(AWG24 to16)
3.2 Measured-circuit
・It is not impossible to use to measure several loads by different strain power supply. (2-circuit of same
system for 1 unit)
・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 3 expansion units are connected to 1 main unit.
*Power source system
・Power source system is the electrical power system from one power source (normally one
transformer).
･KW2M-A can measure 1-system max. 24-circuit of 1P2W system and 1-system max. 8-circuit of 1P3W
and 3P3W system by connecting a main unit and expansion units.
・In order to measure several systems, it is necessary to use one main unit for each system.
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3.3 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 3expansion 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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3.4 Wiring Diagrams
Please connect a breaker or a fuse to the power supply and voltage input part for safety reasons and to
protect the device.
･Recommended breaker: 3 to 15A (IEC approved or UL Listed)
･Recommended fuse : Time-lag fuse rated current 2A (IEC approved or UL Listed)
Grounding the secondary side of VT (Voltage transformer) and CT (Current transformer) is not
necessary with low-voltage circuit.
*When using several CTs, set each CT approximately 1m apart. If the two CTs are set too close each
other, it may not measure accurately due to magnetic field interference.
◆
When measuring a load with rated input voltage
Single-phase two-wire system
*One CT is needed to measure single-phase two-wire system.
*2 CTs are needed to measure 2-circuit and 3 CTs are needed to measure 3-circuit.
*To measure 2-circuit, wire 1 and 3. To measure 3-circuit, wire 1 and 3 and 5.
Single-phase three-wire/Three-phase three-wire
*2 CTs are needed to measure single-phase three-wire system, three-phase three-wire system.
*4 CTs are needed to measure 2-circuit.
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Three-phase four-wire system
*3 CTs are needed to measure three-phase four-wire system.
*6 CTs are needed to measure 2-circuit.
Vn terminal should be connected to N-phase which is grounded.
◆When measuring a load with exceed input voltage
Voltage transformer (VT) is needed when you measure a load with over input voltage.
Use a VT, those secondary voltage rating is 110V.
Grounding the secondary side of VT and CT is not necessary with low-voltage circuit.
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3.5 How to attach the Current Transformer (CT)
・Use CT that the secondary side current is 5A or 1A.
・One CT is needed when measuring 1-circuit of 1P2W. Two CTs are needed when measuring
1P3W/3P3W (4 CTs for 2-circuit).Three CTs are needed when measuring 3P4W (6 CTs for 2-circuit).
Using all CTs for one unit should be the same.
・Use the applicable wire, or it might cause a breakdown, burnout or electric shock.
・When connecting CT, connect the secondary side to the terminal of the main unit first, and after that
wire the primary side to a load electric wire. Incorrect order might cause an electric shock or break
CT.
・The CT has polarity. Wire correctly according to the K and L marks. Wrong direction can’t measure
correctly.
･If there is some distortion by harmonic or waveform, it may not measure correctly.
Please check with the actual system before adopts it.
・Separate the wiring (strong electric part) of the measured voltage input terminal (operating power
supply terminal) from the CT cable. It may not satisfy the accuracy due to noise.
DANGER
●Never open the secondary circuit of CT under applying current to load.
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◆How to connect CT
(1) Power off the measured devices.
(2) Install applicable CT.
(3) Connect CT to the terminal block.
(4) After confirm all wiring correct, turn on the power of the load and KW2M-A.
(Connection example)
◆How to set the parameters for CT
(1) Select CT type (CT-T) according to the using CT.
(Select ‘5A’ if secondary side current of using CT is 5A. Select ‘1A’ if secondary side current
of using CT is 1A.)
(2) Set the primary current of measured CT at primary side current of CT setting mode (CT-1).
< ex > If the measured CT is 400A/1A or 400A/5A, set to”400”.
(3) Connect CT according to the CT direction, power side (K) to load side (L).
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3.6 For Input Connection
●Pulse input
・Contact input
Use highly reliable metal plated contacts. Since the contact’s bounce time leads directly to error in
the count value, use contacts with as short a bounce time as possible. In general, select 30Hz for
max.counting speed.
・Non-contact input (Transistor input)
Connect with an open collector. Use the transistor with the following specifications.
VCEO=20V min. IC=20mA min. ICBO=6μA max
Use transistors with a residual voltage of less than 3V when the transistor is ON.
*`Short-circuit impedance should be less than 1kΩ.
Open-circuit impedance should be more than 100kΩ.
(When the impedance is 0Ω, drain current is approx. 10mA.)
・Input wiring
Please wire as short as possible by using a shielded wire or a metallic electric wire tube individually.
3.7 For Output Connection
●PhotoMOS relay output
・It adopts PhotoMOS relay output, there is no polarity.
Output: Rated capacity 30V AC/DC, 0.1A
・Do not connect devices that voltage or load exceeds the rated capacity (30V AC/DC,0.1A)
・Please wire less than 100m fir output.
If it is long, it may not work correctly due to floating capacitance.
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