Panasonic KW8M User manual

【KW8M (AKW8111)】
Basic setting to measure by 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.15
p.22
p.15
p.23
How to use
6.2
6.2
5.3
7
Measure
ON-time and
OFF-time
Check measured
time with power
monitoring mode
6.2
3
3
3
3
3

【KW8M with log function (AKW8111H)】
Basic setting to measure by 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.
Check
demand data
After measuring,
read out by using
software
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
the tool
software
Wire
communication
line
Wire input
line
Power on the main unit
Initialize memory of main unit (MODE4) and set calendar timer (
＊
) (MODE5)
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.15
p.28
p.22
p.15
p.23
p.26
p.26
How to use
6.2
6.2
6.3
5.3
7
Measure
ON-time and
OFF-time
Check measured
time with power
monitoring mode
6.2
p.26
3
3
3
3
3
Use simple
demand function
Set demand
setting
(MODE1)
6.2

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
“KW8M Eco-POWER METER”.
In this manual, we explain the usage of “KW8M
Eco-POWER METER” in detail.
Please use it correctly after understanding the content
enough.

Table of Contents
Cautions before using ...............................................................................................................................ⅰ
Chapter 1 Unit’s Features and Structure ...................................................................................................1
1.1 Features................................................................................................................................................... 1
1.2 Unit’s Name and Part Numbers............................................................................................................... 1
1.2.1 Main unit......................................................................................................................................... 1
1.2.2 Option............................................................................................................................................. 1
1.3 Measurement items ................................................................................................................................. 2
Chapter 2 Parts Name and Working..........................................................................................................3
2.1 Parts Names............................................................................................................................................ 3
2.2 Select Keys’ Functions ............................................................................................................................ 3
Chapter 3 Wiring.........................................................................................................................................4
3.1 Main unit terminal arrangement............................................................................................................... 4
3.2 Wiring Diagrams ...................................................................................................................................... 5
3.3 For input connection ................................................................................................................................ 9
3.4 For Output connection ........................................................................................................................... 10
3.5 RS485 Communication.......................................................................................................................... 10
3.6 Low Voltage Directive............................................................................................................................ 11
Chapter 4 Settings....................................................................................................................................12
4.1 Operation procedure.............................................................................................................................. 12
4.2 Setting Mode Explanation...................................................................................................................... 15
4.2.1 MODE1......................................................................................................................................... 15
4.2.2 MODE2......................................................................................................................................... 23
4.2.3 MODE3......................................................................................................................................... 24
4.2.4 MODE4......................................................................................................................................... 26
4.2.5 MODE5......................................................................................................................................... 28
Chapter 5 Various Functions....................................................................................................................29
5.1 LOCK mode........................................................................................................................................... 29
5.2 Display while communication................................................................................................................. 29
5.3 Display when pulse output..................................................................................................................... 29
5.3.1 Output depends on integral electric power................................................................................... 30
5.3.2 Instantaneous electric power alarm ............................................................................................. 30
5.3.3 Current alarm................................................................................................................................ 30
5.3.4 Stand-by power alarm.................................................................................................................. 30
5.3.5 Output depends on count value ................................................................................................... 30
5.3.6 Demand alarm.............................................................................................................................. 30
5.4 Counter function..................................................................................................................................... 31
5.4.1 Operation mode............................................................................................................................ 31
5.4.2 Change the Preset Value............................................................................................................. 31
5.5 Simple demand function *Only AKW8111H........................................................................................ 32
Chapter 6 Display of each Value..............................................................................................................34
6.1 Working of Monitor Display.................................................................................................................... 34
6.2 Outline for the Working of Power Monitoring Mode Display.................................................................. 35
6.2.1 Integral Electric power.................................................................................................................. 36
6.2.2 Instantaneous Electric power....................................................................................................... 37
6.2.3 Current.......................................................................................................................................... 37
6.2.4 Voltage ......................................................................................................................................... 38
6.2.5 Electricity Charge ......................................................................................................................... 39
6.2.6 Power factor ................................................................................................................................. 39
6.2.7 Frequency..................................................................................................................................... 40
6.2.8 Hour meter.................................................................................................................................... 40
6.2.9 Demand display (only for AKW8111H) ........................................................................................ 42
6.2.10 Counter....................................................................................................................................... 46
6.3 Outline for the Working of Option Mode Display (only for AKW8111H)................................................ 47
6.3.1 Monthly integral electric power (only for AKW8111H).................................................................. 48
6.3.2 Daily integral electric power (only for AKW8111H)...................................................................... 49
6.3.3 Hourly integral electric power (only for AKW8111H).................................................................... 50
6.3.4 Integral electric power (active) for arbitrary period (only for AKW8111H) ................................... 51
6.3.5 Calendar Timer (only for AKW8111H) ......................................................................................... 51

Chapter 7 Communications......................................................................................................................52
7.1 Communication Procedures .................................................................................................................. 52
7.2 Communication timing ........................................................................................................................... 52
7.3 MEWTOCOL Communication................................................................................................................ 53
7.3.1 Overview of MEWTOCOL-COM (RS485).................................................................................... 53
7.3.2 Data Register List......................................................................................................................... 54
7.3.3 Error Codes.................................................................................................................................. 57
7.3.4 Command..................................................................................................................................... 57
7.4 MODBUS (RTU) Communication.......................................................................................................... 59
7.4.1 Overview of MODBUS (RTU)....................................................................................................... 59
7.4.2 Data Register List......................................................................................................................... 62
Chapter 8 Battery for Memory Backup (only for AKW8111H)................................................................. 67
8.1 Setting before using............................................................................................................................... 67
8.2 How to Replace Battery......................................................................................................................... 67
8.3 How to Remove ..................................................................................................................................... 68
8.4 How to Mount......................................................................................................................................... 68
Chapter 9 Specifications ..........................................................................................................................69
9.1 Main unit ................................................................................................................................................ 69
9.2 Input Specifications................................................................................................................................ 70
9.2.1 Electric power input...................................................................................................................... 70
9.2.2 Pulse input.................................................................................................................................... 70
9.3 Pulse output (Transistor output) Specifications..................................................................................... 71
9.4 Communication Specifications............................................................................................................... 71
9.5 Option Specifications (only for AKW8111H).......................................................................................... 72
9.5.1 Logging......................................................................................................................................... 72
9.5.2 Simple Demand............................................................................................................................ 72
9.6 Self-diagnostic function.......................................................................................................................... 73
9.7 Power Failure Memory........................................................................................................................... 73
9.8 Applicable standard ............................................................................................................................... 73
9.9 Dedicated Current Transformer Specifications...................................................................................... 74
Chapter 10 Mounting................................................................................................................................75
10.1 Dimensions.......................................................................................................................................... 75
10.1.1 Main unit..................................................................................................................................... 75
10.2 Panel cutout......................................................................................................................................... 76
10.3 Panel mounting.................................................................................................................................... 76

i
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
・Installation and wiring must be performed by expert personnel for electrical work or electric
piping.
・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.
・Eco-POWER METER is designed to be used in a control panel.
■
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.
･This can’t measure the power that flows reverse such as a regenerative electric power.
If you measure a reverse power, it shows “0.00kW” and it doesn’t count.
・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.
■
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.

ii
■
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.

KW8M Eco-POWER METER
1
Chapter 1 Unit’s Features and Structure
1.1 Features
■With KW8M 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.
This also works as an hour meter, that is measured power-on or power-off time, and as a counter that
is for pulse output equipment like flow meter.
■Eco-POWER METER is designed chiefly to manage saving energy. It is neither intended nor
can it be legally used for billing.
1.2 Unit’s Name and Part Numbers
1.2.1 Main unit
Model No Log function Simple demand function
AKW8111 Not available Not available
AKW8111H Available Available
(Common)
Phase and Wire
system
Power
supply
Measured
voltage input
Measured
current input
Current
transformer
Terminal
type
・Single-phase two-wire
・Single-phase three-wire
・Three-phase three-wire
・Three-phase four-wire
100-240V
AC
50/60Hz
・400VAC
・100/200VAC
50A
100A
250A
400A
600A
Dedicated CT
type
Screw
Terminal
(M3 +/-
screw)
1.2.2 Option
Dedicated Current Transformer (CT) Clamp-on type
Product name
Rated primary current
Model No
Dedicated current transformer for 5A/50A 5A / 50A AKW4801B
Dedicated current transformer for 100A 100A AKW4802B
Dedicated current transformer for 250A 250A AKW4803B
Dedicated current transformer for 400A 400A AKW4804B
Dedicated current transformer for 600A 600A AKW4808C
Dedicated Current Transformer (CT) Through type
Product name
Rated primary current
Model No
Dedicated current transformer for 50A/100A 50A / 100A AKW4506B
Dedicated current transformer for 250A/400A 250A / 400A AKW4507B
Dedicated current transformer for 600A 600A AKW4508B
Others
Product name
Model No
Terminal cover AKT8801
Spare Battery *1)
Required to back up memory and calendar
AFC8801
Mounting frame
AKW8822
CT expansion cable 3m
AKW4703
CT expansion cable 5m
AKW4705
*1) This is attached to AKW8111H when shipped.

KW8M Eco-POWER METER
2
1.3 Measurement items
Item
Unit
Data range
Integral electric
power
Active
kWh
0.00 to 9999999.9
Reactive
kvarh
Apparent kVAh
Instantaneous
electric power
Active kW 0.00 to 999999.99
Reactive kvar -99999.99 to 0.00 to 999999.99
Apparent kVA 0.00 to 999999.99
Current CT1 A 0.0 to 6000CT2 A
CT3 A
Voltage Between P1-P0 V 0.0 to 9999Between P2-P0 V
Between P3-P0 V
Electricity charge *1
0.00 to 99999999
Power Factor Unit display
0.00 to 1.00
(LEAD: Leading phase, LAG: lagging phase)
Communication
-0.99 to 0.00 to 1.00
(Within the range of phase angle θ=-90 to 0 to 90 degree)
Frequency Hz 47.5 to 63.0
Hour meter ON-time hour 0.0 to 99999.9
OFF-time
Pulse counter 0 to 99999999
Simple demand*2
Present
demand
kW 0.00 to 999999.99
Estimated
demand
kW 0.00 to 999999.99
Ratio of
estimated
demand
% 0.0 to 9999.9
*1 Eco-POWER METER is designed chiefly to manage saving energy.
It is neither intended nor can it be legally used for billing.
*2 Simple demand is the function only for AKW8111H. It supports only CT input (power measurement).
It doesn’t support pulse input.
Please use this simple demand function as your standard. The time used in this function is the time
set by Eco-POWER METER. Therefore it is different from the demand meter controlled by your
power company.

KW8M Eco-POWER METER
3
Chapter 2 Parts Name and Working
2.1 Parts Names
①Display indicator ・Lighting or Blinking according to the display
②LOCK indicator ・Lighting while in lock mode
③
T/R indicator
・
Blinking while communication
④OUT indicator ・Lighting when pulse output
⑤Display each value ・Display each measured value
・Display each setting value
⑥MODE Key
⑦SET Key
⑧ITEM / △Key
⑨SHIFT / ▽Key
⑩Left / Right ( /) Keys
⑪OPTION Key
⑫START/STOP Key
2.2 Select Keys’ Functions
Key Functions
<MODE> ・Use to select mode
<SET> ・Use to set each value entered
< ITEM
△
> ・To select measured display
・To shift each mode
・To change each setting value
< SHIFT
▽
> ・To select measured display
・To shift each mode
・To change each setting value
< Left / Right ( / )> ･To change each setting value
<SET> + <MODE> ・To reset the measured value
<SET>
・All keys locked
・Release lock mode while in lock mode
(continuous press 3-sec)
<OPTION> ・To shift power monitoring mode and option mode (Only AKW8111H)
<START/STOP> ・To start and stop measuring integral electric power (active)
for arbitrary period. (from press this key until press it again)
(Only AKW8111H)
⑨
⑧
⑪
⑫
⑤
②
③
④
①
⑥
⑦
⑩

KW8M Eco-POWER METER
4
Chapter 3 Wiring
3.1 Main unit terminal arrangement
Function No. Function
Back view
N.C.
①
⑪
P1
Measured
voltage
input
① ⑪
Power
Supply L ②⑫P0 ②⑫
N ③⑬P2 ③⑬
Pulse
Input ＋
④
⑭
P3
④ ⑭
－⑤⑮CT1 (＋)
Measured
CT
input
⑤⑮
Pulse
Output ＋⑥⑯CT1 (－) ⑥⑯
－ ⑦ ⑰
CT2 (
＋
)
⑦ ⑰
RS485 ＋⑧⑱CT2 (－) ⑧⑱
－⑨⑲CT3 (＋) ⑨⑲
E ⑩⑳CT3 (－) ⑩⑳
The input voltage to each terminal is as follows.
Terminal Phase and wire Terminal Input voltage
Operating
power supply
Single-phase,
two-wire ②－③
100
-240VAC (100 - 240V～) (Line voltage)
Measured
voltage input
Single-phase,
two-wire
⑪－⑫ 0-440VAC ( 0-440V～) (Line voltage)
Single-phase,
three-wire ⑪－⑫－⑬ 0-220VAC ( 0-220V～：3W) (Phase voltage)
Three-phase,
three-wire
⑪－⑫－⑬ 0-440VAC ( 0-440V 3～) (Line voltage)
Three-phase,
four-wire
⑪－⑫－⑬－⑭ 0-254VAC ( 0-254V 3N～) (Phase voltage)
Caution for Wiring
1) Terminal fastening torque should be 0.6 to 1.0N･m.
2) This has no built-in power switch, circuit breaker for power supply part. 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) The terminal block of KW8M is designed to be wired from left. Insert wires to the terminal from the
left and fasten with terminal screws.
4) In case using insulation sleeve, use an insulation sleeve applicable to M3 screw. Fastening torque
should be 0.6 to 1.0N･m. (Refer to the below.)
5) We recommend a wire with the cross section of 0.75 to 1.25mm2for power supply line and measured
voltage input line.
6) Use flame-resistant cable for each wiring.

KW8M Eco-POWER METER
5
3.2 Wiring Diagrams
Please connect a breaker (3 to 15A) to power supply and voltage input part for safety reasons and to
protect the device. Grounding the secondary side of VT (Voltage transformer) and CT (Current
transformer) is not necessary with low-voltage circuit.
◆When measuring a load with rated input voltage
Single-phase two-wire system
One current transformer (CT) is required to measure single-phase two-wire system.
Back view
Single-phase three-wire
Two CTs are required to measure single-phase three-wire system.
Wire by diagram of single-phase 2-wire system when measure load using R-S with single-phase 3-wire
system.
Back view

KW8M Eco-POWER METER
6
Three-phase three-wire system
Two CTs are required to measure three-phase three-wire system.
Back view
Three-phase four-wire system
Three CTs are required to measure three-phase four-wire system.
Back view

KW8M Eco-POWER METER
7
◆When measuring a load with exceed input voltage
Voltage transformer (VT) is needed when you measure a load with over rated input voltage (440V).
Use VT, those secondary rating is 110V.
Grounding the secondary side of VT and CT is not necessary with low-voltage circuit.
Single-phase two-wire system Single-phase, three-wire
Back view
Back view
No.13,14,17
～
20 are not wired. No.14, 19, 20 are not wired.
Three-phase, three-wire system Three-phase, four-wire system
Back view
No.14, 19, 20 are not wired.
Back view
CT1
11
12
13
14
15
16
L N
VT
P1
P0
k
l
11
12
13
14
15
16
17
18
CT1
R N S
CT2
P1
P0
P2
k
l
k
l
VT
11
12
13
14
15
16
17
18
19
20
R S T N
P1
P0
P2
P3
VT
CT3
k
k
CT1
k
CT2
k
k
R S T
11
12
13
14
15
16
17
18
P1
P0
P2
CT1
CT2
VT

KW8M Eco-POWER METER
8
◆How to attach the Current Transformer (CT)
・One current transformer (CT) is needed to measure 1P2W system. Two CTs are needed to measure a
1P3W/3P3W system. Three CTs are needed to measure a 3P4W system. Using all CT should be the
same.
・Check beforehand that the thickness of the electric wire is smaller than the through-hole of the CT.
・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.
・When closing clamp-on type CT, check that there is no foreign materials on the divided face. And
make sure it is closed securely once the wire is in place; if not the measurement value will be not
accurate.
・When CT’s cable is extended, it is possible to extend up to about 10m with the cable of AWG#22 or
more cross section under the environment without noise at all. Please use the thick cable as much as
possible. *Please check beforehand with the actual system in case of extending the cable.
･If there is some distortion by harmonic or waveform, it may not measure correctly. Please check with
the actual system before adopting 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.
◇To connect CT with secondary current 5A
How to connect the unit to measure by combination with existing commercial CT
(1) Select 5A at CT type setting mode (CT-T).
(2) Set the primary current of measured commercial CT (secondary current 5A) at primary side
current of CT setting mode (CT-1).
< ex > If the measured CT is 400A/5A, set to”400”.
(3) Clamp the dedicated CT for 5A (AKW4801), which is connected to the main unit first, to
secondary side of the commercial CT. CT direction (K→L) should be set for the commercial CT
direction.
(Connection example)
With Ammeter etc.
Secondary current
Breaker
Dedicated CT for 5A
Ammeter etc.
Power supply
CT with 2nd current 5A L K
K
L
Eco-POWER
METER
Load

KW8M Eco-POWER METER
9
Without Ammeter
3.3 For input connection
・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 1.5V when the transistor is ON.
*`Short-circuit impedance should be less than 1kΩ.
(When the impedance is 0Ω, drain current is approx. 7mA.)
Open-circuit impedance should be more than 100kΩ.
・Input wiring
Please wire up to 10m by using a shielded wire or a metallic electric wire tube individually.
If it is long, it may not work correctly due to floating capacitance of wire.
(Note)
Operating power supply input part and measured voltage input are not insulated to pulse input parts.
So the input equipment must have the power supply transformer in which the secondary side is not
grounded with the primary and secondary sides insulated, in order to prevent interference of the
power supply circuit when connecting the external input circuit. Be sure not to use an
auto-transformer.
Secondary current
Breaker
Power supply
CT with 2nd current 5A
K
L
Load Dedicated CT for 5A
L K
Eco-POWER
METER
Shorted or resistor less than 0.1Ω
Eco-POWER
METER
(
＋
)
(
－
)
Insulated
transformer
Input equipment
(sensor etc.)
Operating power supply
Measured voltage input
(Fig. A)
Good example

KW8M Eco-POWER METER
10
3.4 For Output connection
・Since the transistor output is insulated from the internal circuit by a photo-coupler, it can be used both
as a NPN output and PNP (equal value) output.
3.5 RS485 Communication
・When using shielded cable for the RS485 transmission line, ground one end.
Use a class D dedicated earth for grounding. Do not share a ground with other earth lines. (Fig.1)
・Be sure to connect with daisy chain the RS485 transmission line between each unit.
Do not use a splitter. (Fig.2)
・With a terminal station, RS485 (E) (No.10) and RS485 (-) (No.9) should be shorted.
*E terminal is not SG (signal ground) terminal. Do not ground shielded cable.
(Fig.2)
Correct wiring
○
Incorrect wiring
×
Terminal Terminal
station station
(＋) (＋)
Shielded cable
To RS485 device
Shielded cable
Eco-POWER METER
General station
Eco-POWER METER
Terminal station
Class D grounding
Class D grounding
(－
)
(
E
) (－
)
(
E
)
Shorted
(Fig.1)
Eco-POWER
METER
(＋)
(
－
)
Eco-POWER
METER
Auto transformer
(Fig.B) No Good example
Do not ground the secondary side.
Do not use an auto-transformer.
Operating power supply
Measured voltage input
Operating power supply
Measured voltage input
Insulated
transformer
Input equipment
(sensor etc.)
Input equipment
(sensor etc.)
(＋)
(
－
)
Power supply for Load
- +
NPN output
Eco-POWER METER
Pulse (－)
Pulse (+)
PNP output
6
- +
Eco-POWER METER
Power supply for Load
7
Pulse (－)
Pulse (+)
6
7
Load Load

KW8M Eco-POWER METER
11
Recommended Cable
Use the transmission cables shown below for Eco-POWER METER RS485 communication system.
Cable
Conductor
Insulator
Cable
diameter Applicable cable
Size
Resistance
(at 20
℃）
Material Thickness
Twisted-
pair
with shield
1.25 mm2
(AWG16)
or more
Max.16.8Ω/km Polyethylene Max.
0.5 mm Approx. 8.5 mm
HITACHI
KPEV-S
1.25 mm2×1P
Belden Inc. 9860
0.5 mm2
(AWG20)
or more
Max.33.4Ω/km Polyethylene Max.
0.5 mm Approx. 7.8 mm
HITACHI
KPEV-S
0.5 mm2×1P
Belden Inc. 9207
VCTF
0.75 mm2
(AWG18)
or more
Max.25.1Ω/km PVC Max.
0.6 mm Approx. 6.6 mm
VCTF
0.75 mm2×2C
(JIS)
Cable
Section
Notes
1) Use shielded type twist cables.
2) Use only one type of the transmission cables.
2) Do notmix different types of the cables.
3) Use twist pair cables under a bad noise environment.
Twisted-pair
with shield
VCTF
3.6 Low Voltage Directive
When using in the application confirming to EN61010-1/IEC61010-1, make sure to satisfy the following
conditions.
(1) Pulse output part and communication part secure only basic insulation. In order to secure reinforced
(double) insulation demanded by EN 61010-1/ IEC61010-1, secure basic insulation or more with
load side for output part and secure basic insulation or more with communication system side for
communication part.
(2) Provide the voltage input part with an EN60947-1 or EN60947-3 compliant circuit breaker.
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.
(3) Use a wire with basic insulation or more for a wire cramped (or connected) CT.
【Environmental conditions】
・Overvoltage category Ⅱ, Pollution degree 2
・Indoor use
・An ambient temperature of –10 to 50℃
・An ambient non-condensing humidity of 35 to 85%RH (at 20℃)
・Altitude of 2000m or less
【Mount the product in a place with】
・A minimum of dust, and an absence of corrosive gases
・No flammable, explosive gasses
・Few mechanical vibrations or shocks
・No exposure to direct sunlight
・No large capacity electromagnetic switches or cables through which large current is flowing
Conductor Insulator
Jacket
Shield
Jacket
Conductor Insulator