Panasonic KW8M User Manual
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Panasonic KW8M User Manual

Eco-power meter
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  • Page 2 【KW8M 1A/5A CT input type (AKW8115)】 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.
  • Page 3 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.
  • Page 4 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.

  • Page 5: Table Of Contents

    Table of Contents Cautions before using ..........................ⅰ Chapter 1 Unit’s Features and Structure ....................1 1.1 Unit’s Name and Part Numbers ....................... 1 1.1.1 Main unit ............................1 1.1.2 Options ............................1 1.2 Measurement items ..........................2 Chapter 2 Parts Name and Working......................3 2.1 Parts Names ............................
  • Page 6 Chapter 8 Specifications.........................45 8.1 Main unit ..............................45 8.2 Input Specifications..........................46 8.2.1 Electric power input ........................46 8.2.2 Pulse input............................ 47 8.3 Pulse output (Transistor output) Specifications ..................47 8.4 Communication Specifications....................... 48 8.5 Self-diagnostic function.......................... 48 8.6 Power Failure Memory........................... 48 8.7 Applicable standard ..........................

  • Page 7: Cautions Before Using

    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...

  • Page 8: Power Supply

    ■ 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.

  • Page 9: Chapter 1 Unit's Features And Structure

    KW8M Eco-POWER METER (1A/5ACT input type) Chapter 1 Unit’s Features and Structure ■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.

  • Page 10: Measurement Items

    KW8M Eco-POWER METER (1A/5ACT input type) 1.2 Measurement items Item Unit Data range (Display) Active Integral electric Reactive kvarh 0.00 to 9999999.9 power Apparent kVAh Active 0.00 to 999999.99 Instantaneous Reactive kvar -99999.99 to 0.00 to 999999.99 electric power Apparent 0.00 to 999999.99...

  • Page 11: Chapter 2 Parts Name And Working

    KW8M Eco-POWER METER (1A/5ACT input type) 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 ⑤ ③TX/RX indicator ・Blinking while communication ④OUT indicator ・Lighting when pulse output ②...

  • Page 12: Chapter 3 Wiring

    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.

  • Page 13: Wiring Diagrams

    KW8M Eco-POWER METER (1A/5ACT input type) 3.2 Wiring Diagrams Please connect a breaker (3 to 15A) to the 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.
  • Page 14 KW8M Eco-POWER METER (1A/5ACT input type) 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...
  • Page 15 KW8M Eco-POWER METER (1A/5ACT input type) ◆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 a VT, those secondary rating is 110V. Grounding the secondary side of VT and CT is not necessary with low-voltage circuit.
  • Page 16 KW8M Eco-POWER METER (1A/5ACT input type) ◆How to connect CT with secondary side current 1A or 5A (1) Select 5A or 1A at CT type setting mode (CT-T). (2) Set the primary current of measured CT (secondary side current 5A) at primary side current of CT setting mode (CT-1).

  • Page 17: For Input Connection

    KW8M Eco-POWER METER (1A/5ACT input type) 3.3 For input connection ◇Input connection ・Contact input Use highly reliable metal plated contacts. Since the contact’s bounce time ⑤ ④ leads directly to error in the count value, use contacts with as short a bounce time as possible.

  • Page 18: Rs485 Communication

    KW8M Eco-POWER METER (1A/5ACT input type) 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.

  • Page 19: Low Voltage Directive

    KW8M Eco-POWER METER (1A/5ACT input type) 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...

  • Page 20: Chapter 4 Settings

    KW8M Eco-POWER METER (1A/5ACT input type) Chapter 4 Settings 4.1 Operation procedure 【Basic setting to measure】 When wiring Eco-POWER METER and CT and setting mode 1 after power on, Eco-POWER Meter can measure the electric power. In order to use the other functions, set mode2, 3 and 4 according to your use.
  • Page 21 KW8M Eco-POWER METER (1A/5ACT input type) Mode 2 …Mode for setting of each parameter for pulse measurement Mode 3 …Mode for setting of each parameter for serial communication Mode 4 …Mode for setting of each parameter for optional function Monitor (Display when power on) <MODE>...

  • Page 22: Setting Mode Explanation

    KW8M Eco-POWER METER (1A/5ACT input type) 4.2 Setting Mode Explanation ■The value with under line is initial setting among each setting value. ☆Set before measurement. 4.2.1 MODE1 (Mode for setting each parameter for power measurement.) Phase/Wire system setting mode SYST Mode defines phase and wire system to measure.
  • Page 23 KW8M Eco-POWER METER (1A/5ACT input type) Unit for pulse output setting mode PL-P Mode defines unit used for pulse output. It defines the unit of integral electric power for 1-pulse output. ・Select from 0.001/0.01/0.1/1/10/100kWh /AL-P/AL-C/AL-S/Cnt. When one of the “0.001/0.01/0.1/1/10/100” [kWh] is set, one pulse is output at reaching the setting value.
  • Page 24 KW8M Eco-POWER METER (1A/5ACT input type) Mode1 Setting flow chart Monitor ↓ <MODE> MODE1 display ↓<SET> Phase/Wire system setting mode Press <ITEM/△>, <SHIFT/▽> to change Single-phase 2-wire ⇔ Single-phase 3-wire ⇔ Three-phase 3-wire ⇔ Three-phase 4-wire. 1P2W 1P3W 3P3W 3P4W ↓<SET>...
  • Page 25 KW8M Eco-POWER METER (1A/5ACT input type) VT ratio setting mode Set VT ratio using <ITEM/△>, <SHIFT/▽>, < >, < >. If the VT is 440/110, set to “4.00”. ITEM Increase value (1.00～99.99) △ SHIFT Decrease value ▽ Shift place to set Shift place to set ↓<SET>...
  • Page 26 KW8M Eco-POWER METER (1A/5ACT input type) Unit for pulse output setting mode Press <ITEM/△>, <SHIFT/▽> to change 0.001 ⇔ 0.01 ⇔ 0.1 ⇔ 1 ⇔ 10 ⇔ 100 ⇔ AL-P(Alarm) ⇔ AL-C(Alarm) ⇔ AL-S(Alarm) ⇔ Cnt (Count output). 0.001 0.01...
  • Page 27 KW8M Eco-POWER METER (1A/5ACT input type) *It is only when “AL-S” is selected on unit for pulse output setting mode. Stand-by alarm setting mode 1 Set a ratio (for the rated current) of current used for threshold value to judge stand-by power using <ITEM/△>, <SHIFT/▽>, <...
  • Page 28 KW8M Eco-POWER METER (1A/5ACT input type) Electricity charge setting mode Set the rate per 1kWh using <ITEM/△>, <SHIFT/▽>, < >, < >. ITEM Increase value (0.00～99.99, Initial 10.00) △ SHIFT Decrease value ▽ Shift place to set Shift place to set ↓<SET>...

  • Page 29: Mode2

    KW8M Eco-POWER METER (1A/5ACT input type) 4.2.2 MODE2 (Mode for setting of each parameter for pulse measurement) Max. counting speed setting mode Mode defines max. counting speed. ・Select from 2000(2kHz)/30(30Hz). Pre-scale setting mode PSCL Mode defines pre-scale value used for changing count value.

  • Page 30: Mode3

    KW8M Eco-POWER METER (1A/5ACT input type) 4.2.3 MODE3 (Mode for setting of each parameter for serial communication (RS485)) Protocol setting mode PROT Mode defines communication protocol of main unit via serial communication (RS485). ・Select from MEWTOCOL / MODBUS(RTU). Station number setting mode Mode defines an individual station no.
  • Page 31 KW8M Eco-POWER METER (1A/5ACT input type) Station number setting mode Set the station number using <ITEM/△>, <SHIFT/▽>, < >, < >. ITEM Increase value ( 1 to 99 ) △ SHIFT Decrease value ▽ Shift place to set Shift place to set ↓<SET>...

  • Page 32: Mode4

    KW8M Eco-POWER METER (1A/5ACT input type) 4.2.4 MODE4 (Mode for setting of each parameter for optional function) Auto-off setting mode Display LED turns off automatically when there is no key operation for a long time. ・Off time can be set the range of 0 to 99min.

  • Page 33: Chapter 5 Various Functions

    KW8M Eco-POWER METER (1A/5ACT input type) Chapter 5 Various Functions 5.1 LOCK mode It is the mode makes all keys unable. Use when you want to fix one of the measurement displays (For all displays). In this mode, you can not input by any keys.

  • Page 34: Stand-By Power Alarm

    KW8M Eco-POWER METER (1A/5ACT input type) 5.3.4 Stand-by power alarm When it detects stand-by power (current) of the measured load, pulse output (transistor output) turns on in order to notice. Set current (C) and stand-by time (T) to judge stand-by power.

  • Page 35: Chapter 6 Display Of Each Value

    KW8M Eco-POWER METER (1A/5ACT input type) Chapter 6 Display of each Value 6.1 Outline for the Working of Display It displays measured value as below. Integral electric power → → Integral Integral Integral active power reactive power apparent power <SHIFT/▽>...

  • Page 36: Integral Electric Power

    KW8M Eco-POWER METER (1A/5ACT input type) 6.1.1 Integral Electric Power ・It displays the integral electric power. ・Press <SHIFT/▽> to shift active power, reactive power, apparent power. Integral active power Integral reactive power Integral apparent power (kWh) (kvarh) (kVAh) [kWh] [kvarh]...

  • Page 37: Instantaneous Electric Power

    KW8M Eco-POWER METER (1A/5ACT input type) 6.1.2 Instantaneous Electric Power ・It displays the Instantaneous electric power. ・Press <SHIFT/▽> to shift active power, reactive power, apparent power. Instantaneous Instantaneous Instantaneous reactive power (kvar) active power (kW) apparent power (kVA) [kW] [kvar]...

  • Page 38: Voltage

    KW8M Eco-POWER METER (1A/5ACT input type) ・Current measurement parts Eco-POWER METER measures the current as below. Display System Single-phase two-wire L1(R) current (Skip) (Skip) Single-phase three-wire L1(R) current L2 (T) current (Skip) Three-phase three-wire L1(R) current L2 (T) current L3 (S) current...

  • Page 39: Electricity Charge

    KW8M Eco-POWER METER (1A/5ACT input type) 6.1.5 Electricity Charge ・It displays the standard electricity charge for the integral electrical power. [CHARGE] Lighting *When the value exceeds ‘99999999’, will be displayed. 6.1.6 Power factor ・It displays the loads’ power factor. *Before start measuring, select phase and wire system according to the measured load.

  • Page 40: Frequency

    KW8M Eco-POWER METER (1A/5ACT input type) 6.1.7 Frequency ・It displays the frequency. [Hz] Lighting 6.1.8 Hour meter ・It displays the load ON-time or load OFF-time measured by CT1. ・Press <SHIFT/▽> to change the load ON-time to load OFF-time. *”ON-h” and “OFF-h” display disappears after a few seconds by pressing <ITEM/△> or <SHIFT/▽>.

  • Page 41: Counter

    KW8M Eco-POWER METER (1A/5ACT input type) *When load current is under the setting current for time measurement (HM-A), it measures as OFF-time. When load current is exceeded to the setting current for time measurement (HM-A), it measures as ON-time. Current for time measurement (HM-A) is set to under cutoff current (CUTA), all current is measured as OFF-time.
  • Page 42 KW8M Eco-POWER METER (1A/5ACT input type) ・When the count-number is 8 digits or more, press <SHIFT/▽> to change the upper digits and the lower digits. Pulse input number: 98765432 Prescale setting value: 50.001 「4938370365.432」 Lower digits 8-digit Upper digits 5-digit...

  • Page 43: Chapter 7 Communications

    KW8M Eco-POWER METER (1A/5ACT input type) Chapter 7 Communications 7.1 Communication Procedures Communication starts with command transmission from the host computer (hereafter Master) and ends with the response of Eco-POWER METER (hereafter Slave). Master Slave • Response with data Command...

  • Page 44: Mewtocol Communication

    KW8M Eco-POWER METER (1A/5ACT input type) 7.3 MEWTOCOL Communication 7.3.1 Overview of MEWTOCOL-COM (RS485) ◆Command and response functions The computer sends commands (instructions) to Eco-POWER METER, and receives responses in return. This enables the computer and Eco-POWER METER to converse with each other, so that various kinds of information can be obtained and provided.

  • Page 45: Data Register List

    KW8M Eco-POWER METER (1A/5ACT input type) 7.3.2 Data Register List Data register Name Unit Kind of data Range DT00050 Rate 0.01 0 to 9999 Unsigned 16bit Rated A DT00060 CT type 2 types: 1, 5 Unsigned 16bit (rms) 1(0.001),10(0.01),100(0.1), 1000(1),10000(10),100000(100)

  • Page 46: Error Codes

    KW8M Eco-POWER METER (1A/5ACT input type) Data register Name Unit Kind of data Range DT00170 Voltage L1V(R) 0.1V 0 to 99999 Unsigned 32bit DT00171 DT00172 Voltage L2V(S/T) 0.1V 0 to 99999 Unsigned 32bit DT00173 DT00174 Voltage L3V(S/T) 0.1V 0 to 99999...
  • Page 47 KW8M Eco-POWER METER (1A/5ACT input type) ◆[RD]: Read data area (Reads the contents of data area.) ◇Command Ending word No. Starting word No. Destination 5 characters ％ ＃ 5 characters ×10 ×10 ×10 ×10 ×10 ×10 ×10 ×10 ×10 ×10 ×10...

  • Page 48: Modbus (Rtu) Communication

    KW8M Eco-POWER METER (1A/5ACT input type) 7.4 MODBUS (RTU) Communication 7.4.1 Overview of MODBUS (RTU) ◆8-bit binary data in command is transmitted as it is. Data format Start bit : 1 bit Data bit : 8 bits *7bits is not available.
  • Page 49 KW8M Eco-POWER METER (1A/5ACT input type) ◇Data: Data depends on the function code. A request message from the master side is composed of data item, number of data and setting data. A response message from the slave side is composed of number of bytes, data and exception code in negative acknowledgement.
  • Page 50 KW8M Eco-POWER METER (1A/5ACT input type) <3> Reset integral electric power (0064H, 0065H:2-word) of address 1 (When setting to 0 [0000, 0000H]) ・Command Number of Slave Function Data item Number of 3.5 idle data item to ⇒ address code data...

  • Page 51: Data Register List

    KW8M Eco-POWER METER (1A/5ACT input type) 7.4.2 Data Register List MODBUS Range: Hexadecimal Data item Name Unit Kind of date Function (Range: Decimal) (MEWTOCOL) code 0032H 03H/ Rate 0.01 Unsigned 16bit 0H to 270FH (0 to 9999) (DT00050) 06H/10H 003CH...
  • Page 52 KW8M Eco-POWER METER (1A/5ACT input type) MODBUS Range: Hexadecimal Data item Name Unit Kind of date Function (Range: Decimal) (MEWTOCOL) code 0096H<LSB> 03H/ (DT00150) Load ON-time 0.1h Unsigned 32bit 0H to F423FH (0 to 999999) 06H/10H 0097H<MSB> (DT00151) 0098H<LSB> (DT00152)

  • Page 53: Chapter 8 Specifications

    KW8M Eco-POWER METER (1A/5ACT input type) Chapter 8 Specifications 8.1 Main unit Rated operating voltage 100 to 240V AC Rated frequency 50/60Hz common Rated power consumption Inrush current Max. 30A (240VAC at 25℃) Allowable operating 85 to 264V AC (85 to 110% of rated operating voltage)

  • Page 54: Input Specifications

    KW8M Eco-POWER METER (1A/5ACT input type) 8.2 Input Specifications 8.2.1 Electric power input Single-phase two-wire system Single-phase three-wire system Phase and wire system (common) Three-phase three-wire system Three-phase four-wire system Single-phase two-wire : 0 -440V AC (Line voltage) Single-phase three-wire :...

  • Page 55: Pulse Input

    KW8M Eco-POWER METER (1A/5ACT input type) 8.2.2 Pulse input Input mode Addition (Fixed) Max. counting speed 2kHz /30Hz (Select with setting mode) Min. input signal width: Pulse input 0.25ms (When 2kHz selected) /16.7ms (When 30Hz selected) ON:OFF ratio = 1 : 1 Contact / No contact (open collector) ・Impedance when shorted: Max.

  • Page 56: Communication Specifications

    KW8M Eco-POWER METER (1A/5ACT input type) 8.4 Communication Specifications Interface Conforming to RS485 Protocol MEWTOCOL/MODBUS(RTU) (selectable with setting mode) Isolation status Isolated with the internal circuit Number of connected units 99 (max.) ＊ ＊ Transmission distance 1200m (max.) ＊ Transmission speed...

  • Page 57: Chapter 9 Mounting

    KW8M Eco-POWER METER (1A/5ACT input type) Chapter 9 Mounting 9.1 Dimensions 9.1.1 Main unit (Unit: mm) (Clearance: ±1.0) 9.2 Panel cutout (Unit: mm) For connected mounting n=numbers of mounting units...

  • Page 58: Panel Mounting

    KW8M Eco-POWER METER (1A/5ACT input type) 9.3 Panel mounting 1) Insert a unit from the front of the panel. 2) Attach the mounting bracket by the holes at the top and bottom of case and secure in place with screws.

  • Page 59: Chapter 10 Q&A

    KW8M Eco-POWER METER (1A/5ACT input type) Chapter 10 Q&A I’d like to measure by Eco-POWER METER. Measured load is 50 to 60A in normal operation. But the inrush current is 130 to 140 A. Which CT is selected? (100A or 250A) Select 100ACT.

  • Page 60: Revision History

    KW8M Eco-POWER METER (1A/5ACT input type) Revision History Issue Date Manual no. Content of revision May, 2010 ARCT1F504E First edition March, 2012 ARCT1F504E-1 edition Improve the accuracy July, 2013 ARCT1F504E-2 edition Company name change...
  • Page 61 ©...

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