Yokogawa CW120, CW121 Operating Manual

User's Manual

IM CW120-E

CW120/121 CLAMP-ON POWER METERS

Before Use

Before starting measurement with your CW120 or CW121, fill in the Setting Check Sheet in the back of the site.

Operation Guide

(IM CW120P-E) with your particular settings, to facilitate setting on

4th Edition: May. 2007 (KP)

IM CW120-E

Introduction

Thank you for purchasing our CW120 or CW121 Clamp-on Power Meter. This User’s Manual explains the functions of the CW120/121, as well as the operating methods and handling precautions. Before using the CW120/121, read this manual thoroughly to ensure correct use of the instrument.

The Operation Guide manual, available separately in addition to this manual, describes the basic procedures for performing such tasks as measurement operations and settings. Use the Operation Guide together with this in-depth manual.

When you have finished reading this manual, carefully store it in a convenient place for future reference.

Notes

The contents of this manual are subject to change without prior notice. In addition, figures and illustrations representing display appearances in this manual may differ from the actual appearances. Every effort has been made to ensure the accuracy of this manual. If you notice any errors or have any questions, however, please contact one of the Yokogawa sales offices listed on the back cover of this manual or the sales representative from which you purchased the instrument. The contents of this manual may not be transcribed or reproduced, in part or in whole, without prior permission.

Trademark Acknowledgments

All company and product names appearing in this document are trademarks or registered trademarks of their respective holders.

Revision Information

December 2001: 1st Edition June 2003: 2nd Edition – – – : 3rd Edition May 2007: 4th Edition

IM CW120-E

Checking Items in the Package

After opening the package, check the product as follows before use. If the delivered product is the wrong model, any item is missing, or the appearance is defective, contact the vendor from which you purchased the product.

CW120/121 Main Unit

Check the model and suffix (specifications) codes in the MODEL and SUFFIX fields of the nameplate at the back of the instrument to ensure that the instrument is exactly as specified in your purchase order.

Model and Suffix Codes

Model CW120

CW121

Power cord

Communication interface

Option codes

Suffix Code

-D

-F

-H

-R

-S

-1

-2 /C1 /C2 /C3 /C4 /C5 /C6 /C7 /C8

Clamp-on power meter for single-phase two-wire, single-phase three-wire, three-phase three-wire, and single-phase tow-wire ×2* circuits

Clamp-on power meter for single-phase two-wire, single-phase three-wire, three-phase three-wire, three-phase four-wire, single-phase tow-wire ×2*, and single-phase tow-wire ×3* circuits

UL/CSA standard VDE standard GB standard SAA standard BS standard With RS-232-C interface With RS-485 interface Clamp-on current probe for 20/200 A (2 pieces/set) Clamp-on current probe for 20/200 A (3 pieces/set) Clamp-on current probe for 50/500 A (2 pieces/set) Clamp-on current probe for 50/500 A (3 pieces/set) Clamp-on current probe for 200/1000 A (2 pieces/set) Clamp-on current probe for 200/1000 A (3 pieces/set) Clamp-on current probe for 5/50 A (2 pieces/set) Clamp-on current probe for 5/50 A (3 pieces/set) * “×2”, “×3” means multiple-system load measurements.

Specification

No. (serial number):

Refer to this serial number on the nameplate when contacting the vendor about the instrument.

IM CW120-E

Accessories

Make sure that the package contains all the accessories listed below and that they are all free from any damage.

Product Name Part Number Qty Remarks

Power cord B9988YA

(One of the four options) B9988YB -F: VDE standard

Voltage probes

User’s Manual IM CW120-E

Operation Guide IM CW120P-E

5. Set Up Disk 2 TOOL BOX

1. 2. 3.

(for CW120) (for CW121)

B9988YJ -H: GB standard B9988YC -R: SAA standard B9988YD -S: BS standard

91018 3 91007 4 Color: Black, red, yellow, blue

1 1

Checking Items in the Package

-D: UL/CSA standard

Color: Black, red, yellow

IM CW120-E

Checking Items in the Package

Peripherals (Optional)

The products listed below are available as optional peripherals. For technical and ordering inquiries concerning the peripherals, contact the vendor from which you purchased the instrument. If you purchased any one of the optional peripherals together with the CW120/121, make sure it is free from any damage.

Product Name

Clamp-on current probe for 20/200 A 96030 1

Clamp-on current probe for 50/500 A 96031 1

Clamp-on current probe for 200/1000

Clamp-on current probe for 5/50 A 96033 1

Power supply cabl Voltage probes (for CW121

Voltage probes (for CW120 RS-232C cabl

RS-232 serial printer cabl Printe

AC adapter (for printer) 94006 1 Power supply 200-240 V AC AC adapter (for printer) 94007 1 Power supply 100-120 V AC Thermal printer pape Carrying case 93022 1 For CW120 Series Meter case 93023 1 For CW120 Series Memory Card (128 to 512 MB) 97033 to 35 1 With PC card adapter Application Software AP240 1

r 97080 10 rolls

Part NumberMinimum Order Qt

A 96032 1

9803

) )

9100

9101

11D-sub 9 pin

9101

9701

y Remarks

See the option codes for a choice of probe kits. Applicable to CE or UL

See the option codes for a choice of probe kits. Not applicable to CE and UL

See the option codes for a choice of probe kits Applicable to CE. Not applicable to UL.

Not applicable to CE and U 1 se

31 set

With 1 thermal paper roll and 1 battery pac

TIP

Keep the packing box in case you need to transport the instrument.

IM CW120-E

Housing CW120/121 and Accessories

The optional carrying case can accommodate the CW120 or CW121 main unit with its current-sensing clamp-on probes and voltage probes connected to the unit. The case can also hold such accessories as manuals and PC cards, and so is useful for transporting a complete set of tools necessary for measurement.

The optional meter case can be used as a stand during measurement as shown below right. It also has a magnetic rear plate and so can be stuck to the door of a power distribution panel or the like.

Note: Keep the meter case away from objects vulnerable to a magnetic field, such as floppy disks.

Manual

Clamp-on current probes

Checking Items in the Package

Voltage probes

CW120/121 main unit

Carrying Case Meter case

Adjust the Velcro fastener.

IM CW120-E

Precautions for Safe Use of the Instrument

When operating the instrument, be sure to observe the cautionary notes given below to ensure correct and safe use of the instrument. If you use the instrument in any other way than instructed in this manual, the instrument’s protective measures may be impaired. Yokogawa is by no means liable for any damage resulting from use of the instrument in contradiction to these cautionary notes. The following safety symbols are used in the instrument and this manual.

Danger! Handle with Care.

This symbol indicates that the operator must refer to an explanation in the instruction manual in order to avoid risk of injury or death of personnel or damage to the instrument.

Direct Current

This symbol indicates DC voltage/current.

Alternating Current

This symbol indicates AC voltage/current.

This symbol indicates On (power).

OFF

This symbol indicates Off (power).

Double Insulation

This symbol indicates double insulation.

WARNING

Indicates a hazard that may result in the loss of life or serious injury of the user unless the described instruction is abided by.

CAUTION

Indicates a hazard that may result in an injury to the user and/or physical damage to the pr oduct or other equipment unless the described instruction is abided by.

NOTE

Indicates information that is essential for handling the instrument or should be noted in order to familiarize yourself with the instrument’s operating procedures and/or functions.

TIP

Indicates information that complements the present topic.

SEE ALSO

Indicates the reference location(s) for further information on the present topic.

IM CW120-E

Precautions for Safe Use of the Instrument

Strictly observe the following cautionary notes in order to avoid the risk of injury or death of personnel or damage to the instrument due to such hazards as electrical shock.

WARNING

● Removal of Case from the Instrument

• Do not remove the case from the instrument or disassemble/modify the instrument itself.

• Some parts of the inside of the instrument contain high-voltage and, therefore, access to the internal assembly is extremely hazardous. For inspection and/or adjustment of the internal assembly, contact the vendor from which you purchased the instrument.

● Use of the Instrument in a Gas Atmosphere

Do not operate the instrument in a location where any flammable or explosive gas/vapor is present. It is extremely hazardous to operate the instrument in such an atmosphere.

● Inspection of Power Source

• Before turning on the instrument, always make sure the voltage of the power source to be applied matches the instrument’s supply voltage.

● Use of Clamp-on Current Probes

•When using clamp-on current probes, keep the circuit voltage below 600 V AC in order to avoid possible short-circuits or accidents resulting in injury or death.

• Ensure that the rated current of the circuit you measure matches the rating of the current probe.

•Avoid using the instrument if it has been exposed to rain or moisture or if your hands are wet.

• Do not use clamp-on current probes with any non-insulated conductors.

● Measures In Case of Anomalies

If the instrument begins to emit smoke, becomes too hot, or gives off an un usual smell, immediately turn it off and disconnect the power cord from the outlet. Also turn off power to the object under measurement that is connected to the instrument’s input terminals. Never attempt to use the instrument again. If any such anomalies as noted above occurs, contact the vendor from which you purchased the instrument. Do not attempt to repair the instrument yourself, as doing so is extremely dangerous.

● Handling of Power Cord

• Use only the cord supplied from Yokogawa M&C to prevent electric shocks and fire.

• Do not place any load on the power cord or allow the power cord to come into accidental contact with any heat source. When unplugging the power cord from the outlet, hold its plug, rather than holding and pulling the cord itself.

• If the power cord is damaged, contact the vendor fr om which y ou purchased the instrument.

● Fuses

Fuses built into this instrument for protection cannot be replaced b y the user. When an y b uiltin fuses need to be replaced such as because they have blown, contact the vendor from which you purchased the instrument.

IM CW120-E

Utilisation en Toute Securite

Les précautions suivantes doivent être prises pendant l'exploitation, la maintenance et les réparations. YOKOGAWA ne pourra en rien être déclaré responsable si ces précautions ne sont pas respectées par l'utilisateur.

● Symboles utilisés sur les appareils et dans les Manuels d'instruction.

Explication: ce symbole indique que l'opérateur doit se reporter à une explication donnée par le manuel d'instruction afin d'éviter un accident au personnel ou de protéger l'appareil.

Courant continu: Ce symbole indique une tension/intensité C.C. Courant alternatif: Ce symbole indique une tension/intensité C.A. MARCHE: Ce symbole indique la mise sous tension.

ARRET: Ce symbole indique la mise hors tension. Double isolation: Ce symbole indique une double isolation.

AVERTISSEMENT Indique un danger. Attire l'attention sur une utilisation, sur une procédure qui pourraît être dangereuse

pour le personnel. ATTENTION Indique un danger. Attire l'attention sur une utilisation, sur une procédure qui pourraît être préjudiciable

au produit.

IM CW120-E

Utilisation en Toute Securite

AVERTISSEMENT

● Retrait du boîtier de l'instrument

• Ne pas retirer le boîtier de l'instrument et ne pas essayer non plus de démonter/modifier l'instrument lui-même.

•L'instrument renferme des composants parcourus par des tensions élevées. Il est donc extrêmement dangereux d'accéder à ses circuits internes. Pour vérifier et/ou régler les circuits internes, contacter le revendeur auprès duquel a été acheté l'instrument.

● Utilisation de l'instrument dans une atmosphère gazeuse Ne pas utiliser l'instrument dans un endroit qui renferme des gaz/vapeurs inflammables ou explosifs.

Il est extrêmement dangereux d'utiliser l'instrument dans une telle atmosphère.

● Vérification de la source d'alimentation

•Avant de mettre l'instrument sous tension, toujours s'assurer que sa tension correspond à celle de la source d'alimentation.

● Utilisation des sondes d'intensité à pince

• Lors de l'utilisation des sondes d'intensité à pince, maintenir la tension du circuit au-dessous de 600 V CA afin d'écarter tout risque de court-circuit ou d'accident susceptible de provoquer des blessures qui peuvent éventuellement s'avérer mortelles.

• Assurez-vous d'utiliser un capteur de courant dont le calibre correspond au niveau d'intensité à mesurer.

• Eviter d'utiliser l'instrument si celui-ci a été exposé à la pluie ou à l'humidité, ou encore si vos mains sont humides.

• Ne pas utiliser les sondes d'intensité à pince avec des conducteurs non isolés.

● Mesures à prendre en cas d'anomalies Si l'instrument est brûlant, dégage de la fumée ou une odeur inhabituelle, le mettre immédiatement

hors tension et débrancher le cordon d'alimentation de la prise secteur. Mettre également hors tension le circuit sur lequel est effectuée la mesure et qui est raccordé aux bornes d'entrée de l'instrument. Ne surtout pas essayer d'utiliser l'instrument à nouveau. Si l'une de ces anomalies est détectée, contacter le revendeur auprès duquel a été acheté l'instrument. Ne pas essayer de le réparer soimême, car cela est extrêmement dangereux.

● Manipulation du cordon d'alimentation

• Afin de prévenir tout feu ou choc électrique, n'utilisez que le cordon fourni par Yokogawa M&C.

• Ne déposer aucune charge sur le cordon d'alimentation et éviter tout contact fortuit entre celui-ci et

une source de chaleur. Pour débrancher le cordon de la prise secteur, tirer sur sa fiche, mais jamais sur le fil proprement dit. Si le cordon d'alimentation est endommagé, contacter le revendeur auprès duquel a été acheté l'instrument.

● Fusibles Les fusibles de protection montés sur cet instrument ne peuvent pas être remplacés par l'utilisateur.

Si, par suite de claquage, un fusible doit être remplacé, veuillez contacter le vendeur auprès de qui vous avez acheté l'instrument.

IM CW120-E

Introduction ..............................................................................................................1

Checking Items in the Package .............................................................................. 2

Precautions for Safe Use of the Instrument .......................................................... 6

Chapter 1. Product Overview...............................................................................1-1

1.1 Product Overview ........................................................................................1-1

Chapter 2. Components and Indications ............................................................ 2-1

2.1 Front Panel and Connector Block ............................................................... 2-1

2.2 Connecting Input Signals ............................................................................ 2-3

2.3 Operation Keys and Display........................................................................ 2-5

2.4 Overrange and Other Marks Shown during Measurement.......................... 2-6

Chapter 3. Precautions for Safe Measurement ..................................................3-1

3.1 Handling Precautions .................................................................................. 3-1

3.2 Installation Procedure.................................................................................. 3-3

3.3 Maintaining High Precision of Measurement............................................... 3-5

Chapter 4. Connecting Power Supply and Turning Power On/Off ...................4-1

4.1 When Using AC Power Supply.................................................................... 4-1

4.2 When Supplying Power from Voltage Input................................................. 4-3

4.3 Startup Screens........................................................................................... 4-4

4.4 Basic Operation Flow .................................................................................. 4-6

Chapter 5. Wiring ..................................................................................................5-1

5.1 Precautions for Wir ing the Circuit under Test .............................................. 5-1

5.2 Diagrams of Basic Wiring............................................................................ 5-2

5.3 Wiring the Circuit under Test with External VT/CT ...................................... 5-4

5.4 Indication and Change of Wiring Method .................................................... 5-5

5.5 Wiring Check Function ................................................................................ 5-6

Chapter 6. Setting Ranges and Wiring Method ..................................................6-1

6.1 Ranges and Display Digits .......................................................................... 6-1

6.2 Changing Voltage Range Setting ................................................................ 6-6

6.3 Changing Current Range Setting ................................................................ 6-7

6.4 Changing Wiring Method Setting............................................................... 6-10

Chapter 7. Making Settings..................................................................................7-1

7.1 Setting Items and Item Selection................................................................. 7-1

7.2 Setting Each Item........................................................................................ 7-4

7.3 Setting Name of Measured-data File......................................................... 7-33

IM CW120-E

Contents

Chapter 8. Instantaneous Value Measurement..................................................8-1

8.1 Measuring Instantaneous Values ................................................................ 8-1

8.2 Switching Display Contents......................................................................... 8-2

8.3 Saving Data................................................................................................. 8-5

8.4 Frequency Measurement ............................................................................ 8-8

8.5 Sampling Cycle and Integration Cycle ........................................................ 8-9

Chapter 9. Electric Energy Measurement ........................................................... 9-1

9.1 Measuring Electric Energy .......................................................................... 9-1

9.2 Starting and Stopping Integration................................................................ 9-3

9.3 Switching Display Contents....................................................................... 9-10

9.4 Saving Data............................................................................................... 9-13

9.5 Backup Memory ........................................................................................ 9-16

9.6 External Control Input/Output.................................................................... 9-19

9.7 Meter Actions upon Power Failure and Recovery ..................................... 9-22

Chapter 10. PC Card ...........................................................................................10-1

10.1 PC Card Specifications ............................................................................. 10-1

10.2 Inserting and Removing PC Card.............................................................. 10-2

10.3 Storage Capacity....................................................................................... 10-3

10.4 Formatting PC Card .................................................................................. 10-4

10.5 Saving and Loading from/to PC Card........................................................ 10-5

10.6 Interface with Personal Computer............................................................. 10-7

Chapter 11 Communication Functions ............................................................ 11-1

11.1 RS-232 ...................................................................................................... 11-1

11.2 RS-485 ...................................................................................................... 11-6

11.3 Data Format .............................................................................................. 11-9

Chapter 12. Auxiliary Functions ........................................................................12-1

12.1 Convenient Functions ................................................................................ 12-1

12.2 Using Optional Printer ............................................................................... 12-3

Chapter 13. Troubleshooting ............................................................................. 13-1

13.1 Corrective Measures in Case of Failure.................................................... 13-1

13.2 Error Codes............................................................................................... 13-2

13.3 Disposing the Product ............................................................................... 13-3

Chapter 14. Specifications .................................................................................14-1

14.1 Specifications of CW120/121 .................................................................... 14-1

14.2 Specifications of Clamp-on Current Probes .............................................. 14-9

Appendix 1.Circuit Block Diagram ............................................................... App1-1

Appendix 2. Communication Commands....................................................App2-1

1. Commands .......................................................................................... App2-2

1.1 Messages..............................................................................................App2-2

1.2 Commands............................................................................................App2-4

1.3 Response .............................................................................................. App2-5

1.4 Data.......................................................................................................App2-6

1 2 3 4 5 6 7 8

9 10 11 12 13 14

App

Index

IM CW120-E

Contents

1.5 Messages on RS-485............................................................................App2-8

1.6 Communication Commands ..................................................................App2-9

1.7 Detailed Description of Communication Commands........................... App2-12

1.7.1 COMMunicate Group ............................................................... App2-12

1.7.2 SYSTem Group ........................................................................App2-13

1.7.3 INTEgrate Group...................................................................... App2-15

1.7.4 MEASure Group....................................................................... App2-17

1.7.5 STATus Group..........................................................................App2-17

1.7.6 MEMOry Group........................................................................App2-18

1.7.7 CARD Group............................................................................App2-18

1.7.8 Common Group .......................................................................App2-19

2. Error Messages ............................................................................... App 2-20

3. Command Effectiveness Tables....................................................... App 2-24

Appendix 3. File Structures and Data Items Printed .................................App3-1

1. Overview............................................................................................ App 3-2

2. Measured Data .................................................................................. App 3-3

2.1 File Format ........................................................................................... App 3-3

2.1.1 File Identifier .............................................................................App 3-3

2.1.2 File Type ................................................................................... App 3-3

2.1.3 Measurement Mode .................................................................. App 3-3

2.1.4 Data Field Titles and Data Formats ..........................................App 3-4

2.1.5 Records of Power Failure/Restoration Information ................... App 3-5

2.2 Print Format ..........................................................................................App 3-6

2.2.1 Print Item Titles and Data Formats ........................................... App 3-6

3. Settings.............................................................................................. App 3-8

3.1 File Format ........................................................................................... App 3-8

3.2 Output Format and Data Values ........................................................... App 3-9

3.3 Print Format........................................................................................ App 3-11

4. Automatic File Naming ..................................................................... App 3-12

Appendix 4. Reactive Power ........................................................................App4-1

Index............................................................................................................... Index-1

IM CW120-E

Chapter 1. Product Overview

1.1 Product Overview

The CW120/121 clamp-on power meters measure the fundamental electric power factors, namely, instantaneous power-related values and electric energy (watt-hours).

• CW120: Supports single-phase two-wire, single-phase three-wire, three-

phase three-wire, and single-phase tow-wire × 2 circuits.

• CW121: Supports single-phase two-wire, single-phase three-wire, three-

phase three-wire, three-phase four-wire, single-phase tow-wire × 2, and single-phase tow-wire × 3 circuits.

The following explains the features of the CW120/121, shows a schematic diagram of their functions, and describes the contents displayed on the screen in each measurement mode.

Features

● A Wealth of Functions

• Fast data saving for a long time: Data can be saved at 1-second intervals at fastest. A PC card slot for large removable memories such as flash ATA and compact flash cards allows measurement over a long time.

• Instantaneous value saving: Simply pressing the SAVE key will save the measured values.

•Wiring error check: The connections are checked and any error is displayed before the start of measurement.

Product Overview

IM CW120-E

● Broad Ranges

• Voltage range: 150/300/450 V

• Current range: 4 types of clamp-on probes can be used.

96033 clamp-on probe: 5/10/20/50 A 96030 clamp-on probe: 20/50/100/200 A 96031 clamp-on probe: 50/100/200/500 A 96032 clamp-on probe: 200/500/1000 A

● Ease of Data Processing and Communication

Data can be saved to a PC card. Via communication, data can be transferred to a personal computer and the measurement conditions can be set from a computer. As the communication interface, you can choose (when ordering) RS-232 or RS-485; the RS-485 interface allows multiple CW120s and CW121s to be connected on the same line for remote monitoring.

1-1

1.1 Product Overview

● Compact Design

• The CW120/121 are sufficiently compact to be installed inside a cubicle or

power distribution panel during measurement.

• The 96033 current-sensing probe with a 5 to 50 A range is designed for

use in a narrow space, so is useful for measurement inside a power distribution panel with dense wiring.

● Easy-to-see Display Screen

Despite the compact body, the large back-lit LCD enables easy measurement in a dark place.

1-2

IM CW120-E

● Schematic Function Diagram

Power-on

1.1 Product Overview

Product Overview

Measurement screen

key

Chapter 9

Electric energy (watt-hour) measurement

Start of integration

7.2.8 Setting integration start time

7.2.9 Setting integration stop time

End of integration

Data saving

Auto-saving

7.2.7 Setting output interval File: AWTH000.CSV

External control terminals

Input Output

7.2.11 Selecting communication device

key

Setting device number

7.2.1 Loading/saving settings

7.2.2 Deleting file and formatting PC card

7.2.3 Clearing electric energy count (watt-hours)

7.2.4 and resetting system Copying and clearing backup memory

7.2.5 contents Setting date

7.2.6 Setting output interval

Chapter 8

Instantaneous value measurement

Data saving

key

7.2.7 Setting integration start time

7.2.8 Setting integration stop time

7.2.9 Setting whether to save data to PC card

7.2.10 Selecting communication device

7.2.11 Making communication settings

7.2.12 Setting communication protocol

7.2.13 Setting VT ratio

7.2.14 Setting CT ratio

7.2.15 Selecting probe to be used

7.2.16 Setting decimal point and unit of electric

7.2.17 energy (watt-hours)

Saving settings

File: MWTH000.CSV

Communication interface (chosen when ordering)

7.2.2 Loading/saving setting File: WTH000.SET

RS-485RS-232

PC Printer PC

Setting screens

Chapter 7

PC card

7.2.10 Setting whether to save data to PC card

IM CW120-E

● On-screen Information (Measured Data)

There are two measurement modes: instantaneous measurement and electric energy measurement. In the latter mode, the power is continuously measured and integrated during the preset start and stop times.

Instantaneous value measurement

Item Unit Displayed Name

Rms voltage V V1, V2, V3 (differs depending on the wiring method) Rms current A A1, A2, A3 (differs depending on the wiring method) Active power W W, W1, W2, W3 (differs depending on the wiring

method)

Reactive power Var Var, Var1, Var2, Var3 (differs depending on the wiring

method)

Power factor — PF, PF1, PF2, PF3: PowerFactor

(differs depending on the wiring method)

Frequency Hz Hz (input frequency of V1)

1-3

1.1 Product Overview

Phase Wires

Single-phase two wires (1∅2W) Single-phase three wires (1∅3W)

Three-phase three wires (3∅3W) Three-phase four wires (3∅4W)

Single-phase tow-wires

2 (1∅2W×2)

Single-phase tow-wires

3 (1∅2W×3)

Electric energy measurement

Item Unit Displayed Name

Active electric energy Wh Wh, Wh1, Wh2, Wh3

Regenerative electric energy Wh Only saved; not displayed Six items of instantaneous value measurement

(differs depending on the wiring method)

The screen changes sequentially each time a cursor-movement (UP, DOWN, LEFT, or RIGHT) key is pressed as follows (display contents differ depending on the wiring method):

Var

A1 A2 V3

A1 W1 W2

Var1 Var2

W1 W2 W3

Var1 Var2 Var3

Displayed Item

Screen

PF Hz

Var

A3 PF1 PF2

Hz PF1

PF2 PF3

Screen

TIME

PF Hz

Var Wh1 Wh2

TIME

Wh1 Wh2 Wh3

TIME

Screen

TIME

PF Hz

Screen

TIME

Display Position

Upper row Lower row Upper row Lower row Upper row Lower row

Upper row

Lower row

Upper row

Lower row

Screen

V1 A1 V1 V2 V1 V2

V1 A1

A1 A2 A3

Screen

1-4

IM CW120-E

Chapter 2. Components and Indications

2.1 Front Panel and Connector Block

● Dimensions

Connector Block

Unit: mm (approx. inches)

Front View Side View

161 (6.3)

Components and Indications

IM CW120-E

117 (4.6) 51 (2.0)

2-1

2.1 Front Panel and Connector Block

● Connector Block

Voltage input terminals Current input terminals

CW120: Supports from single-phase two-wire to three-phase three-wire circuits

Voltage input terminals: N, V1, V2 Current input terminals: CH1, CH2

CW121: Supports from single-phase two-wire to three-phase four-wire circuits

Voltage input terminals: N, V1, V2, V3 Current input terminals: CH1, CH2, CH3

● Side Panels

PC card eject button PC card eject button

PC card slot

RS-232 connector

External control terminals

PC card slot

RS-485 screw terminals

Power switch Power supply connector Power switch Power supply connector

Model with RS-232 interface Model with RS-485 interface

RS-232 interface

RS-232 connector : Used to connect to a PC or printer

(optional).

Internal control input (IN) terminals : Used to connect the integration

start/stop input signals.

Internal control output (OUT) terminals : Used to connect the integration

start/stop output signals.

2.2 Connecting Input Signals

Ring marker

Clamp-on current probe

Voltage probe (black)

Voltage probe (red)

Components and Indications

WARNING

• Thoroughly read Section 5.1, “Precautions for Wiring the Circuit under Test.”

•When connecting the CW120/121, turn off the circuit under test. It is extremely dangerous to connect or disconnect probes to/from a live circuit.

• Be extremely careful not to connect any voltage-mode circuit to the current input terminals or any current-mode circuit to the voltage input terminals. Miswiring can result in not only damage to the circuit or equipment under test but also injury to personnel.

• Do not connect any probes which are not necessary (i.e., not used) for the current measurement, even though multiple probes can be connected to the CW120/121 at the same time.

• Do not use any probe other than the clamp-on current probes or voltage probes supplied.

• Do not use a clamp-on current probe for a non-insulated conductor.

• Ensure that the rating of the clamp-on current probe you use matches the rating of the measured current.

• Before connecting a clamp-on current probe to the CW120/121, make sure the plug is inserted with the correct H/L polarities.

IM CW120-E

2-3

2.2 Connecting Input Signals

● Differentiating between Voltage Probes

Voltage probes are differentiated by color for correct connections.

• Probe for terminal N: Probe with a black alligator plug

• Probes for terminals V1 to V3: Probes with a red, yellow, or blue alligator plug

Accompanying probes

CW120: Three (black, red, and yellow) CW121: Four (black, red, yellow, and blue)

● Differentiating between Clamp-on Current Probes

Use accompanying ring markers (of four different colors) to differentiate clamp-on current probes for correct connections.

CW120: Terminals CH1 to CH2 CW121: Terminals CH1 to CH3

Use of Ring Markers

Attach ring markers of the same color to both ends of the probe cable for easy identification.

CAUTION

Be careful not to damage a probe when attaching ring markers.

2-4

IM CW120-E

2.3 Operation Keys and Display

Integration status LED indicator

V RANGE key

A RANGE key

WIRING key

LIGHT key

● Keys

Components and Indications

Key Symbol DescriptionName

Used to set and change the voltage range.

Used to set and change the current range.

Used to set and change the wiring method (phase lines).

Also used to check the wiring. Pressing this key for three seconds or more accesses the wiring check screen.

Switches on/off the backlight of the LCD. Also used to lock and unlock the keys. Pressing this key

for three seconds locks the keys. To unlock, press the key again for three seconds or more.

SAVE key

MEAS/SET key

START&STOP key

ENTER key

ESC (escape) key

Cursor movement keys (UP/DOWN/LEFT/RIGHT keys)

Integration status LED indicator: Lit when the integration is carried out, and flashes when it is on stand-by.

IM CW120-E

Saves the measured data during instantaneous value measurement. Switches over the display between the measurement and setting screens.

Starts and stops integration.

Confirms an entry such as a change to a setting.

Cancels a setting and returns to the preceding screen. Also used to clear the electric energy count (watt-hours).

Pressing this key for three seconds or more accesses the screen for clearing the electric energy count.

In measurement screen: Switches the display contents. In setting screen: Changes the selection or number, or

moves the cursor position (flashing digit) over digits.

2-5

2.4 Overrange and Other Marks Shown during Measurement

WARNING

When the overrange mark appears with the range set to a maximum, it means that the input exceeds the maximum allowable level of the CW120/121. Do not apply an input level higher than the maximum allowable input level.

CAUTION

When measuring an input signal level exceeding the rated range, use a voltage transformer (VT) or current transformer (CT). When using a VT or CT, thoroughly read Section 5.3, “Wiring the Circuit under Test with External VT/CT.”

● Overrange Indications

: Indicates an overvoltage.

This mark appears in the following conditions. 150/300 V range: If the sampled value exceeds 200% of the rated

voltage or if the rms value of the measured voltage exceeds 110% of the rated range

450 V range: If the sampled value exceeds 156% of the rated

voltage or if the rms value of the measured voltage exceeds 110% of the rated range

: Indicates an overcurrent.

This mark appears if the sampled value exceeds 300% of the rated current or if the rms value of the measured current exceeds 110% of the rated range.

TIP

The mark appears when any one of the input signals from terminals V1 to V3 satisfies the conditions noted above.

The mark appears when any one of the input signals from terminals CH1 to CH4 satisfies the conditions noted above.

indication

The CW120/121 show instead of a usual number representing the measured value if any one of the following conditions is met. The number representing the measured value exceeds 9999, the maximum number displayed.

2-6

IM CW120-E

2.4 Overrange and Other Marks Shown during Measurement

Voltage - 150/300 V range: If the sampled value exceeds 200% of the rated voltage or if the rms value of the measured voltage exceeds 130% of the rated range

Voltage - 450 V range: If the sampled value exceeds 156% of the rated voltage or if the rms value of the measured voltage exceeds 110% of the rated range

Current: If the sampled value exceeds 300% of the rated voltage or if the rms value of the measured voltage exceeds 130% of the rated range

● Indications When the Measured Value Is Too Small

Components and Indications

Displayed Item

Voltage Current Active power Reactive power Active electric energy

Displayed Item

Reactive power

Power factor

Frequency

Condition

≤1.5 V ≤0.4% of rated range ≤0.17% of rated range ≤0.17% of rated range ≤0.17% of rated range

Condition

V1 input ≤10% of rated range; or frequency ≤40 Hz or ≥70 Hz

The voltage or current is displayed as ; or V1 input ≤10% of rated range; or frequency

≤40 Hz or ≥70 Hz ≤40 Hz or ≥70 Hz

Indication

0 V 0 A 0 W 0 Var 0 Wh (integration stopped)

Indication

---- Var

---- PF

---- Hz

TIP

Even when an instantaneous value is displayed as , the integration calculation is carried out continuously. The accuracy of the electric energy value, however, is undefined in this case.

IM CW120-E

2-7

2.4 Overrange and Other Marks Shown during Measurement

● Indications of Setting Items

Mark appearing during setting mode:

Setting Item Displayed Mark

1. Device number

2. Loading and saving of settings

3. Deletion of measured-data file and formatting of PC card

4. Clearance of electric energy count (watt-hours) and resetting of system

5. Copying and clearance of backup memory

6. Date

7. Output interval

8. Integration start date and time

9. Integration stop date and time

10. Whether to save data to PC card

11. Selection of communication device

12. Communication settings

13. Communication protocol setting

14. VT ratio setting

15. CT ratio setting

16. Probe selection

17. Decimal position and unit selections for electric energy (watt-hours)

● Indications during Measurement

Displayed Mark

Lights when integration is carried out; flashes when integration is on standby. Lights when integration is controlled by external signals. Lights when PC card memory is full. Lights when the backup memory contains data. Lights when the battery voltage is low. Lights when the keys are locked. Lights when data saving to the PC card is enabled; flashes during access to the PC card. Flashes during access to the PC when a PC is selected as the communication device. Flashes during access to the printer when a printer is selected as the communication device. Lights when the VT ratio is set at a value other than 1. Lights when the CT ratio is set at a value other than 1.

2-8

Indications for current settings of voltage range, current range, and wiring method:

Wiring method Voltage range

Current range

IM CW120-E

2.4 Overrange and Other Marks Shown during Measurement

● Meanings of Messages

Displayed Message Meaning

Appears during standby of integration when set to start at a set date and time.

Appears during standby of integration when a past point of time is set as the integration start time and date and integration will begin at the nearest appropriate time (determined by the output interval).

Appears when integration has finished normally with the set integration start/stop dates and times.

Appears when a power failure has occurred (or the power has been turned off) during standby or integration.

Appears when the backup data is copied from the backup memory to the PC card.

Appears when a PC card is not inserted.

Shows the file number and data record number when saving measured instantaneous values.

Shows the file number when integration begins in the case that data saving to a PC card is enabled but the filename is not specified.

Appears when integration begins in the case that data saving to a PC card is enabled and the filename is specified. The digits following “FILE” indicate “defined.”

Components and Indications

IM CW120-E

2-9

Chapter 3. Precautions for Safe Measurement

3.1 Handling Precautions

If you are a first-time user, be sure to read “Precautions for Safe Use of Instrument” on pages 4 and 5, Section 5.1, “Precautions for Wiring the Circuit under Test,” and Section 5.3, “Wiring the Circuit under Test with External VT/ CT.”

● Do not place any load on the instrument.

Do not place any other equipment of a vessel filled with water on the instrument. Otherwise, the instrument may become defective.

● Moving the instrument

Before moving the instrument, make sure the power cord and all other cables are disconnected.

● Input Terminals

Do not bring any electrified substance close to the signal terminals. Otherwise, the internal circuitry may be destroyed. Do not apply any mechanical shock to the signal terminals. Otherwise, such impact may be transformed into electrical noise and input to the instrument.

Precautions for Safe Measurement

● Protection of Case and Operation Panel

Do not spray any volatile chemical on the case or operation panel. Do not leave any rubber or vinyl product in contact with the instrument for a prolonged period. Otherwise, the instrument may be discolored or deformed.

● Cleaning

When cleaning the case and/or operation panel, disconnect the power cord from the outlet. Then, wipe the surfaces of the case and/or operation panel with a soft clean cloth. Do not use chemicals such as benzine or paint thinner. Otherwise, the instrument may be discolored or deformed.

● Display Screen

When the instrument is shipped from the factory, the display screen is covered with a protective film. Remove the film before you begin using the instrument.

IM CW120-E

3-1

3.1 Handling Precautions

● After Use

After use, disconnect the power cord from the outlet.

Precautions for Use of the Clamp

CAUTION

• The clamping CT (current transformer) is precision assembled to ensure high performance. When using the clamp, do not apply any intense mechanical shock, vibration or force to the clamping CT.

• If dust or any other foreign matter gets in the clamping CT, do not shut the clamping cores tight. First remove the dust and then make sure the clamping cores on both sides close smoothly.

3-2

IM CW120-E

3.2 Installation Procedure

Install the CW120/121 in a location that satisfies the following conditions.

● Indoors

● Ambient Temperature and Humidity

• Ambient temperature: 0°C to 50°C

• Ambient humidity: 5 to 85 % RH (no condensation) When it is applied to UL.

• Ambient temperature: 0°C to 40°C

• Ambient humidity: 5 to 85 % RH (no condensation) Maximum relative humidity 80 % RH for temperature up to 31 °C decreasing linearly to 50 % RH relative humidity at 40 °C.

● Altitude of Location

•Altitude: 2000 m or less

● Measurement Category (CAT.)

The measurement category of the CW120/121 is III.

Measurement