Yokogawa CW240 Operating Manual

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User's Manual

IM CW240E

CW240 Clamp-on Power Meter

1st Edition: June 2004 (KP)

IM CW240E

Index

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

Checking the Contents of the Package........................................ 2

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

Utilisation en Toute Securite ......................................................... 9

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

1.1 Product Overview .............................................................. 1-2

1.2 System Configuration Diagram ........................................ 1-4

Chapter 2 Part Names and How to Use Parts ......... 2-1

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

2.2 Operation Keys .................................................................. 2-3

2.3 Side Faces .......................................................................... 2-4

2.4 Screen Configuration ........................................................ 2-5

2.5 Overrange/Error Indication during Measurement ........... 2-6

2.6 Description of Mark Indication ....................................... 2-11

Chapter 3 Preparation for Safe Measurements ...... 3-1

3.1 Precautions for Use ........................................................... 3-2

3.2 Connecting a Power Supply ............................................. 3-4

3.3 Connecting Voltage Probes ............................................ 3-14

3.4 Connecting Clamp-on Probes ........................................ 3-15

3.5 Connection Diagrams of Voltage Probes and

Clamp-on Probes ............................................................. 3-17

3.6 Turning ON the Power Switch ......................................... 3-22

3.7 Performing Measurements with Greater Precision ...... 3-24

IM CW240E

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Index

Chapter 4 Wiring ........................................................ 4-1

4.1 Precautions for Wiring to the Measurement Circuit ....... 4-2

4.2 Installing the CW240 .......................................................... 4-3

4.3 Setting up Wiring ............................................................... 4-5

4.4 Setting up the Number of Loads ...................................... 4-6

4.5 Carrying out Wiring ........................................................... 4-7

4.6 Wiring the Measurement Circuit

Using External VT/CT ...................................................... 4-23

4.7 Checking Wiring ............................................................... 4-24

Chapter 5 Setting Ranges Using the Direct Keys... 5-1

5.1 Setting the Voltage Range ................................................. 5-2

5.2 Setting the Current Range ................................................ 5-4

5.3 Ranges and Number of Digits ........................................... 5-6

Chapter 6 Configuring Settings ............................... 6-1

6.1 Settings ............................................................................... 6-2

6.2 General Settings 1/2 .......................................................... 6-6

6.3 General Settings 2/2 ........................................................ 6-21

6.4 Save Data Settings 1/2 ..................................................... 6-46

6.5 Save Data Settings 2/2 ..................................................... 6-62

6.6 Communication Settings ................................................. 6-67

6.7 Voltage Quality Settings .................................................. 6-72

6.8 Hardware Settings ........................................................... 6-76

6.9 Analog I/O Settings .......................................................... 6-88

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IM CW240E

Index

Chapter 7 Measurements ..........................................7-1

7.1 Measurements .................................................................... 7-2

7.2 Measure Screens ............................................................... 7-3

7.3 Measuring Electric Energy .............................................. 7-13

7.4 Measuring Demand .......................................................... 7-17

7.5 Displaying Zoom (Expanded View) ................................ 7-21

7.6 Measuring Harmonics ..................................................... 7-24

7.7 Displaying Waveform ....................................................... 7-34

7.8 Measuring Voltage Quality (Voltage Dip,

Voltage Swell, or Instantaneous Interruption) ............... 7-40

7.9 Checking Settings ............................................................ 7-43

7.10 Clearing Integrated Data ................................................. 7-45

7.11 Measurement Data ........................................................... 7-46

Chapter 8 Saving Measured Data............................. 8-1

8.1 Data Save ............................................................................ 8-2

8.2 Saving Measured Data ....................................................... 8-6

8.3 Memory (Reference) ........................................................ 8-11

8.4 Backup Memory ............................................................... 8-13

8.5 Copying Screen Data (Hard copy) .................................. 8-15

Chapter 9 Processing File(s) .................................... 9-1

9.1 File Processing .................................................................. 9-2

9.2 Changing a File Name ....................................................... 9-4

9.3 Deleting a File ..................................................................... 9-6

9.4 Formatting .......................................................................... 9-9

9.5 Data Copy ......................................................................... 9-10

9.6 Setting Files (Load/Save/Delete/Name Change) ........... 9-14

9.7 Backup Memory Copy ..................................................... 9-24

9.8 Backup Memory Delete ................................................... 9-25

Chapter 10 Using the Communication Function

(RS-232) .................................................. 10-1

10.1 Description of the Communication Function ................ 10-2

10.2 Using a Personal Computer ............................................ 10-4

10.3 Using a Printer ................................................................. 10-6

IM CW240E

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Index

Chapter 11 PC Card ................................................... 11-1

11.1 PC Card Specifications ................................................... 11-2

11.2 Inserting and Removing the PC Card ............................ 11-3

11.3 Formatting the PC Card ................................................... 11-4

11.4 Saving in the PC Card ..................................................... 11-5

Chapter 12 Using External Control Input/Output ... 12-1

12.1 External Control Input/Output ........................................ 12-2

12.2 Connecting External Control Terminals ......................... 12-3

12.3 Using Multiple CW240 Units in Synchronization .......... 12-4

Chapter 13 Using Analog Input/Output

(Optional) ................................................ 13-1

13.1 Analog Output (DA Output) ............................................. 13-2

13.2 Analog Input ..................................................................... 13-6

13.3 Connecting Analog Input/Output Terminals .................. 13-8

Chapter 14 Power Failure Processing Function ..... 14-1

Chapter 15 Other Functions ..................................... 15-1

15.1 Holding the Display Value ............................................... 15-2

15.2 Turning the LCD Backlight ON and OFF ........................ 15-3

15.3 Locking the Keys ............................................................. 15-4

15.4 Resetting the System ...................................................... 15-5

Chapter 16 Maintenance Troubleshooting .............. 16-1

16.1 Things to Check When There is a Malfunction ............. 16-2

16.2 Error Message Content and Actions ............................. 16-4

Chapter 17 CW 240 Specifications ........................... 17-1

17.1 CW 240 Specifications ..................................................... 17-2

17.2 Specifications of Current Clamps

(Clamp-on Probe) ........................................................... 17-17

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IM CW240E

Index

Appendix 1 Block Diagram .................................. App.1-1

Appendix 2 File/Print Item Descriptions ............ App.2-1

Appendix 3 Polarity (Active Power, Reactive Power,

Power Factor, Phase Angle) ............ App.3-1

Appendix 4 Polarity

(Harmonic Measurement) ................App.4-1

Appendix 5 Reactive Power Method ................... App.5-1

Appendix 6 Sampling Method ............................. App.6-1

Appendix 7 Terminology ...................................... App.7-1

IM CW240E

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Introduction

Thank you for purchasing our CW240 Clamp-on Power Meter. This User's Manual describes the functions of the CW240 as well as its operating methods and handling precautions. Read this manual thoroughly before using the CW240, to ensure correct use.

In addition to this manual, the Quick Setup Manual and Communication Function Manual (CD-ROM) are available separately. The Quick Setup Manual briefly describes the basic procedures for performing such tasks as setup and measurement operations. Use the Quick Setup Manual together with this indepth User's Manual. For more information on the communication functions, see the Communication Function Manual (CD-ROM). After reading this manual, always keep it in an easily accessible convenient place for later reference. This manual will come in handy when you are unsure of how to operate the product.

Notices

The contents of this manual are subject to change without prior notice. In addition, figures and illustrations representing display views in this manual may differ from actual views. Every effort has been made to ensure accuracy in the preparation of this manual. However, should any doubts arise or errors come to your attention, please contact one of the Yokogawa M&C sales offices listed on the back cover of this manual, or the sales representative from whom you purchased the product. The contents of this manual may not be transcribed or reproduced, in part or in their entirety, without prior permission.

Introduction

Trademark Acknowledgments

The company and product names referred to in this document are either trademarks or registered trademarks of their respective holders.

Revision Information

First Edition: June, 2004

Disk No. CW240E

1st Edition: June, 2004 (KP)

IM CW240E

Checking the Contents of the Package

After opening the package, be sure to check the product as instructed below before use. Should the product you have received be the wrong model, lack any items, or show any problems in its appearance, contact the vendor from whom you purchased the product.

Instrument Main Unit

Check the model name where MODEL is printed on the nameplate located at the back of the CW240 to ensure that the CW240 is exactly as specified in your purchase order.

Model and Suffix Codes

Model

CW240

AC adapter

Option codes

Suffix Code

-D

-F

-R

-S

Specifications

Power cord: UL/CSA standard

VDE standard

SAA standard

BS standard

D/A output and analog input

/DA

Clamp-on current probe for 96030, 2 pcs./set

/C1

Clamp-on current probe for 96030, 4 pcs./set

/C2

Clamp-on current probe for 96031, 2 pcs./set

/C3

Clamp-on current probe for 96031, 4 pcs./set

/C4

Clamp-on current probe for 96032, 2 pcs./set

/C5

Clamp-on current probe for 96032, 4 pcs./set

/C6

Clamp-on current probe for 96033, 2 pcs./set

/C7

Clamp-on current probe for 96033, 4 pcs./set

/C8

Clamp-on current probe for 96036, 2 pcs./set

/C9

Clamp-on current probe for 96036, 4 pcs./set

/C10

Clamp-on current probe for 96034, 2 pcs./set

/C11

Clamp-on current probe for 96034, 4 pcs./set

/C12

Clamp-on current probe for 96035, 2 pcs./set

/C13

Clamp-on current probe for 96035, 4 pcs./set

/C14

NiMH battery pack + carrying case

/PM1

No. field: denotes the product number.

Refer to this number when inquiring about the product to the vendor.

IM CW240E

Checking the Contents of the Package

Accessories

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

Product Name Part No. Q'ty Remarks

1. AC adapter for power supply

2. AA-size alkaline batteries

3. Voltage probes 91007 4 Color: black, red, yellow, blue

4. User's Manual IM CW240 1

5. Quick Setup Manual

6. CD-ROM 1

1. 2. 3.

4. 5. 6.

788011 1set Yokogawa's AC adapter

- 6

IM CW240P 1

IM CW240E

Checking the Contents of the Package

Peripherals (Optional)

The products listed below are available as optional peripherals. For technical and ordering inquiries concerning peripherals, contact the vendor from whom you purchased the product. If the product you purchased includes any one of the optional peripherals, make sure it is free from any damage.

Product Name Part No. Min. Order Q'ty Remarks

Clamp-on Probe

for 200 A 96030 1 for 500 A 96031 1 for 700 A 96032 1 for 50 A 96033 1 for 3000 A 96034 1 Large-diameter type

for 3000 A 96035 1 Flexible type

for 2 A 96036 1

Voltage probe 91007 1 set 4 Carrying case 93020 1 AC adapter 788011 1 set Yokogawa's AC adapter NiMH battery pack 94004 AC adapter for 96035 A1020UP 1 For clamp-on Probes

Printer 97010 1 AC adapter (for printer, Europe)

94006 1

AC adapter (for printer, USA)

94007 1

Thermal paper for printer 97080 10 rolls

Memory card (with a PC card adapter)

16 MB 97030 1 32 MB 97031 1 128 MB 97033 1 256 MB 97034 1 512 MB 97035 1

Selectable from 3000 A, 2000 A, and 1000 A

Selectable from 3000 A and 300 A

TIP

It is advisable that the packing box be saved, as it is useful when you transport the product.

IM CW240E

Checking the Contents of the Package

Housing the CW240 Main Unit and Accessories

An optional carrying case can accommodate the CW240 main unit with its clamp-on probes and voltage probes connected to the unit. The case can also house such accessories as the memory card, AC adapter, and User's Manual. As such, it comes in handy for transporting a complete kit of tools necessary for making measurements.

● Example of Housing:

User's Manual

NiMH battery pack

AC adapter

Clamp-on probes

CW240 main unit

Voltage probes

IM CW240E

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 way other than as instructed in this manual, the instrument’s protective measures may be impaired. Yokogawa M&C Corporation 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 on the instrument and in this manual.

Danger! Handle with Care.

This symbol indicates that the operator must refer to an explanation in the User's Manual in order to avoid risk of injury or death of personnel or damage to the instrument.

Hazardous Voltage

➤

The operator must never attempt to touch equipment or parts marked with this symbol.

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.

WARN ING

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 product or other equipment unless the described instruction is abided by.

IM CW240E

Precautions for Safe Use of the Instrument

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.

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 hazards such as electrical shock.

WARNI N G

● Removal of the 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 Gaseous Atmosphere Do not operate the instrument in a location where any flammable or explosive gas/vapor is present. It is extremely hazardous to operate it 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.

•When using alkaline batteries or an NiMH battery pack, carefully read the cautionary notes on battery handling later in this manual.

IM CW240E

Precautions for Safe Use of the Instrument

WARN ING

● Use of Clamp-on Current Probes

•When using clamp-on current probes, keep the circuit voltage below operating circuit voltage in order to avoid possible shorts or accidents resulting in an 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.

● 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 from which you purchased the instrument.

● Measures in Case of Anomalies If the instrument begins to emit smoke, becomes too hot, or gives off an unusual smell, immediately turn it off and disconnect the power cord from the outlet. Also turn of f 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.

IM CW240E

Utilisation en Toute Securite

Les précautions suivantes doivent être prises pendant l'exploitation, la maintenance et les réparations. YOKOGAWA M&C 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.

Haute tension: Ne pas toucher!

➤

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 CW240E

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’assure que sa tension correspond à celle de la source d’alimentation.

•En cas d’utilisation de piles alcalines ou d’un accumulateur NiMH, lire attentivement les mises en garde relatives à la manipulation des piles/ accumulateurs, plus loin das ce manuel.

● 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 operating circuit voltage 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.

IM CW240E

Utilisation en Toute Securite

AVERTISSEMENT

● 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.

● 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 soi-même, car cela est extrêmement dangereux.

IM CW240E

Chapter 1 Product Overview

1.1 Product Overview ..................................... 1-2

1.2 System Configuration Diagram................ 1-4

Chapter 1 Product Overview

1.1 Product Overview

The CW240 is a clamp-on power meter that measures items necessary for various power measurements or power quality analyses to conduct an energysaving diagnosis or ISO 14001 testing. The measurement items are as shown below and are all measured simultaneously.

• Voltage rms Each phase and mean

For three-phase three-wire : line-to-line voltage or phase voltage from

the virtual mid-point

For three-phase four-wire : phase voltage

• Current rms Each phase and mean

• Power value (active, reactive, and apparent)

• Power factor Each phase and total

• Phase angle Each phase and total

• Frequency

• Electric energy(active, regenerative, lagging reactive, leading reactive)

• Power demand value

• Harmonics (1st to 50th order) Voltage rms, current rms, content,

• Voltage fluctuation Voltage dip, swell, momentary interruption

(Voltage quality) Data is saved by a threshold value-based

• Waveform Voltage and current waveform, full-voltage

Each phase and total

phase angle, power value, power content,

and power phase angle Indication is available as a list, bar graph, and vector diagram.

trigger.

waveform, full-current waveform

Features

1-2

● Supporting a Variety of Wiring Methods

• Wiring Single-phase two-wire, single-phase three-wire, three-phase three-wire twocurrent, three-phase three-wire three-current, and three-phase four-wire systems and Scott connection (three-phase three-wire and single-phase three-wire)

• Loads Single-phase two-wire systems can support up to four loads; single-phase three-wire or three-phase three-wire two-current systems can support up to two loads (shared voltage).

• Leakage current In single-phase three-wire or three-phase four-wire systems, neutral line current (leakage current) can also be measured.

IM CW240E

1.1 Product Overview

● Wide measurement range

Voltage range: 150 V, 300 V, 600 V, and 1000 V Current range: compatible with 7 types of clamp-on current probes

From 200 mA to 3000 A maximum

● Power quality analysis measurement

Power quality analysis can be made using harmonics (1st to 50th order), voltage dip/swell/momentary interruption, and waveform measurement functions.

● Wiring check and setup check

• The wiring check function allows you to check a voltage phase sequence or reverse connection of clamp-on current probes.

• The setup check function allows you to check settings for integration measurements.

● Data management and communication

• Data can be saved using a personal computer (PC) card.

• Data can be transferred to a PC and setup can be made from the PC through communications.

● Equipped with 4CH DA outputs and 2CH analog inputs (DC V) (optional)

• Measured values can be converted into DC voltage and then analog-output to a recorder or other devices.

• Analog outputs from a thermometer or illuminometer can be connected to the analog input terminals of the CW240 to measure power data and environmental data together.

Product Overview

IM CW240E

1-3

CLAMP-ON POWER METER

LIGHT

TOP

SAVE

RANGE

START

&STOP

ESC

ENTER

DISP COPY

RANGE

START

&STOP

ENTER

START

&STOP

ENTER

Voltage inputs

Current inputs (clamps)

CW240: synchronized measurements

using multiple instruments

External control input/output

RS-232

Printer

AC adapter

MV series: recorders

DA outputs (4 CH)

Analog inputs (2 CH)

53003

thermometer

510 series

illuminometer

PC card

Alkaline batteries

NiMH battery pack

"Chapter 13, Section 6.9"

Chapter 3

"Sections 3.3 and 3.5" "Sections 3.4 and 3.5"

Chapter 3

"3.2.1"

"Chapter 10"

"Chapter 12"

Chapter 3

"3.2.2, 3.2.3"

"Chapter 11"

"Chapter 13, Section 6.9"

External contact signal

1.2 System Configuration Diagram

1-4

IM CW240E

Chapter 2 Part Names and How to Use Parts

Chapter 2 Part Names and How to Use

Parts

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

2.2 Operation Keys ......................................... 2-3

2.3 Side Faces ................................................. 2-4

2.4 Screen Configuration ............................... 2-5

2.5 Overrange/Error Indication during

Measurement ............................................ 2-6

2.6 Description of Mark Indication ................ 2-11

Chapter 2 Part Names and How to Use Parts

2.1 Front Panel and Connector Block

Voltage input terminals Current input terminals

Connect the voltage probes to these terminals.

N U1 U2 U3 CH1 CH2 CH3 CH4

Connect clamp-on current probes to these terminals.

RS-232 connector

Connect a PC or printer using a commercially available cable.

External control I/O terminals

Allows you start or stop integration measurements using an external signal. Also, a signal indicating that an integration measurement is being made is output through these terminals.

Display unit

Operation keys

Analog input terminals (optional)

Used for DC voltage inputs.

DA output terminals (optional)

Used for DC voltage outputs.

2-2

IM CW240E

2.2 Operation Keys

F1F

Part Names and How to Use Parts

START

&STOP

Function keys

START & STOP key Starts/stops integration measurements.

LIGHT key Turns the backlight ON/OFF.

TOP MENU key Switches the display screen to the Top Menu.

ESC key

ENTER key

Cursor key Moves the cursor to the item you wish to select.

U RANGE key Changes the voltage range.

A RANGE key Changes the current range.

SAVE key Manually save or print measured data.

DISP COPY key

LIGHT

RANGE

TOP

RANGE

These are setting keys corresponding to the information displayed

in the bottom of the screen.

When held down for more than 3 seconds, it locks or unlocks the

operation keys.

Cancels setup conditions or other data.

Confirms setup conditions or other data.

Hard-copies information displayed on the screen.

Copy destination setting: PC card, internal memory, or printer

ESC

SAVE

Functional DescriptionKey Name

ENTER

DISP COPY

IM CW240E

2-3

2.3 Side Faces

LED

Lights up while a NiMH battery pack (optional) is charged.

PC card slot

AC adapter jack

Connect the AC adapter (accessorie) to this jack.

Power switch

: Power OFF : Power ON

Button for extracting

a PC card

Battery holder

This part holds the alkaline battery holder (accessorie) or NiMH battery holder (optional).

2-4

Battery holder lock switch

Used to lock or unlock a battery holder.

IM CW240E

2.4 Screen Configuration

● Basic Screen Configuration

START

&STOP

MEASURE screen

F2 F3 F4 F5

TOP

LIGHT

RANGE

ENTER

ESC

SAVE

DISP COPY

SETUP screen FILE screen

Part Names and How to Use Parts

IM CW240E

LIST (instantaneous values) POWER INTEGRATE DEMAND ZOOM HARMONIC

[LIST, GRAPH, VECTOR]

WAVEFORM

U & I WAVEFORM U WAVEFORM

I WAVEFORM VOLT. QUALITY WIRING DIAGRAM WIRING CHECK

GENERAL (1/2, 2/2) SAVE (1/2, 2/2) COMMUNICATION VOLT. QUALITY HARDWARE ANALOG I/O (optional)

FILE NAME CHANGE DELETE FILE FORMAT DATA COPY SETTING FILE BACKUP MEMORY COPY BACKUP MEMORY DELETE PROGRAM UPDATE (normally not used)

2-5

2.5 Overrange/Error Indication during Measurement

● Overrange Indication during Measurement : Conditions for voltage overrange indication

This mark appears if the peak value of an input signal exceeds 300% (180% for a 1000 V range) of the rated voltage range or if the rms value of measured voltage exceeds 110% of the rated range.

: Conditions for current overrange indication

This mark appears if the peak value of an input signal exceeds 400% of the rated current range or if the rms value of measured current exceeds 110% of the rated range.

TIP

• Voltage overrange mark appears if an input signal to one of terminals U1 to U3 satisfied the noted conditions.

• Current overrange mark appears if an input signal to one of terminals CH1 to CH4 satisfies the noted conditions.

Indication of "OR" or "----" symbol

The CW240 indicates "OR" or "----" symbol instead of a usual four-digit value if the measured value meets the noted conditions.

WARN ING

The CW240 shows an overrange mark in the maximum range only if the input level exceeds the maximum allowable level. Do not apply any input level higher than the maximum allowable level.

CAUTION

To measure an input signal level exceeding the rated range, use a voltage transformer (VT) or current transformer (CT).

When using a VT or CT, carefully read section 4.5, Wiring the Measurement Circuit Using External VT/CT.

2-6

IM CW240E

2.5 Overrange/Error Indication during Measurement

• Instantaneous value, electric energy, demand

Measurement Item Conditions and Indications

Voltage rms If the peak value of an input signal exceeds 300% (180% for

Current rms If the peak value of an input signal exceeds 400% of the

Active power Reactive power Apparent power

Power factor Phase angle

Frequency

Interval electric energy Electric energy Reactive energy

Power demand Reactive power demand

Analog input (optional)

the 1000 V range) of the measurement range, or if the rms value of measured voltage exceeds 130% of the rated range, "OR" appears.

measurement range, or if the rms value of measured current exceeds 130% of the rated range, "OR" appears.

If power input (active, reactive, or apparent) exceeds 130% of the rated range, "OR" appears. Also, if the measured value exceeds the maximum displayable digits, 9999, "OR" appears.

If the peak value of a voltage input signal exceeds 300% (180% for a 1000 V range) of the measurement range; if the rms value of measured voltage exceeds 130% of the rated range; if the peak value of a current input signal exceeds 400% of the measurement range; or if the rms value of measured current exceeds 130% of the rated range; "----" appears.

If frequency exceeds 70 Hz, the fixed clock is selected.

Even if power input exceeds 130% of the rated range, an excessive power value (active power, reactive power) will be integrated. In this case, however, the accuracy of an integrated value is not specified.

If a demand input exceeds 130% of the rated range, "OR" appears. Also, if the measured value exceeds the maximum displayable digits, 9999, "OR" appears.

If an input exceeds 130% of the rated range, "OR" appears.

Part Names and How to Use Parts

IM CW240E

2-7

2.5 Overrange/Error Indication during Measurement

• Harmonics

Measurement Item Conditions and Indications

Voltage rms If the peak value of an input signal exceeds 300%

Voltage content Voltage phase angle

Current rms If the peak value of an input signal exceeds 400% of the

Current content Current phase angle

Power value If a power input exceeds 130% of the rated range,

Power content Power phase angle

Total harmonic distortion of voltage

Total harmonic distortion of current

(180% for a 1000 V range) of the measurement range, or if the rms value of measured voltage exceeds 130% of the rated range, "OR" appears. If the peak value of an input signal exceeds 300% (180% for the 1000 V range) of the measurement range, or if the rms value of measured voltage exceeds 130% of the rated range, "----" appears.

measurement range or if the rms value of measured current exceeds 130% of the rated range, "OR" appears.

If the peak value of an input signal exceeds 400% of the measurement range, or if the rms value of measured current exceeds 130% of the rated range, "----" appears.

"OR" appears. Also, if the measured value exceeds the maximum displayable digits, 9999, "OR" appears.

If the peak value of a voltage input signal exceeds 300% (180% for a 1000 V range) of the measurement range, or if the rms value of measured voltage exceeds 130% of the rated range, "----" appears.

If the peak value of a current input signal exceeds 400% of the measurement range or if the rms value of measured current exceeds 130% of the rated range, "----" appears.

2-8

IM CW240E

2.5 Overrange/Error Indication during Measurement

● Indication Provided if a Measured Value is Too Small

• Instantaneous value, electric energy, demand

Measurement Item

Voltage

Current

Active power

Reactive power

Apparent power

Electric energy

Reactive energy

Power factor Phase angle

Frequency

Interval electric energy

Power demand

Reactive power demand

Analog input (optional)

If an input level is below 0.4% of the rated range, the reading becomes "0 V".

If an input level is below 0.4% of the rated range, the reading becomes "0 A".

If an input level is 0.17% or less of the rated range, the reading becomes "0 W".

If an input level is 0.17% or less of the rated range, the reading becomes "0 Var".

If an input level is 0.17% or less of the rated range, the reading becomes "0 VA".

If power input is 0.17% or less of the rated range, integration stops.

If reactive power input is 0.17% or less of the rated range, integration stops.

If the input level of either voltage or current is below 0.4% of the rated range, "----" appears.

If frequency is 40 Hz or less or if the input level of a frequency source is 10% or less of the rated range, the fixed clock is selected, displaying the set fixed-clock frequency.

If power input is 0.17% or less of the rated range, integration stops.

If power demand is 0.17% or less of the rated range, the reading becomes "0 W".

If reactive power demand is 0.17% or less of the rated range, the reading becomes "0 Var".

If an input level is below 0.4% of the rated range, the reading becomes "0 V".

Conditions and Indications

Part Names and How to Use Parts

IM CW240E

2-9

2.5 Overrange/Error Indication during Measurement

● Indications on the basis of other input conditions

Measurement Item

Electric energy Reactive energy

Power factor

Power factor demand Total power factor

Phase angle

Power phase angle

Reactive power

Apparent power

Legend P : active power value S : apparent power value

• When the display setting is any item other than AUTO, if the integrated value exceeds "999999", the reading is reset to "0", letting integration continue.

• When the display setting is AUTO, the position of a decimal point or the unit of measurement is shifted by one digit to continue integration.

Because of a computation error, if the power factor:

• Exceeds 1.0, the reading becomes "1.0."

• Is less than -1.0, the reading becomes "-1.0."

• Is S < |P|, the reading becomes "1.0."

Because of a computation error, if the power factor:

• Exceeds 1.0, the reading becomes "1.0."

• Is less than -1.0, the reading becomes "-1.0."

If the power factor exceeds 1.0 or is less than -1.0 due to a computation error, the reading becomes "0°."

If the total power factor exceeds 1.0 or is less than -1.0 due to a computation error, the reading becomes "0°."

Because of a computation error, if

• A value in is negative, the reading becomes "0."

• S < |P|, the reading becomes "0."

If S < |P| due to a computation error, S = |P|.

Conditions and Indications

2-10

IM CW240E

2.6 Description of Mark Indication

Appears if a voltage overrange occurs.

Appears if a current overrange occurs.

Appears when integration measurement is made by external input control.

Appears in the event of loss of PLL synchronization. This automatically selects the fixed clock.

Appears when a reactive power meter method is used.

Appears when display hold is enabled.

Appears if the amount of data exceeds the capacity of a PC card or the internal memory.

Appears when the CW240 is configured so that data is saved in a PC card. Also, this mark flashes during an access to the PC card.

Appears when data has been saved in the backup memory.

Appears when the CW240 is configured so that data is saved in the internal memory. Also, this mark flashes during an access to the internal memory.

Appears if the CW240 is in a key lock state.

Appears when the CW240 is configured so that the RS-232 connection destination is a PC. Also, this mark flashes during communication with the PC.

Appears if the CW240 is configured so that the RS-232 connection destination is a printer. Also, this mark flashes during communication with the printer.

Appears if the CW240 is powered through the AC adapter.

Appears when the CW240 is powered through alkaline batteries or a NiMH battery pack. This mark indicates a battery voltage decrease (remaining capacity) in four steps.

Part Names and How to Use Parts

IM CW240E

2-11

Chapter 3 Preparation for Safe Measurements

Chapter 3 Preparation for Safe

Measurements

3.1 Precautions for Use .................................. 3-2

3.2 Connecting a Power Supply ..................... 3-4

3.3 Connecting Voltage Probes .................... 3-14

3.4 Connecting Clamp-on Probes ................ 3-15

3.5 Connection Diagrams of Voltage Probes

and Clamp-on Probes ............................. 3-17

3.6 Turning ON the Power Switch ................ 3-22

3.7 Performing Measurements with Greater

Precision ................................................. 3-24

Chapter 3 Preparation for Safe Measurements

3.1 Precautions for Use

If you are a first-time user, always read the "Precautions for Safe Use of the CW240" on pages 6 through 11.

● Do not place any objects on the Instrument.

Do not place another device or a container filled with water on the instrument, otherwise, the instrument may become defective.

● Moving the Instrument

Before moving the instrument, check that the power cord and all other cables are disconnected. Hold the instrument with both hands when moving it.

● Input terminals

Do not bring a charged substance close to the signal terminals, otherwise the internal circuitry may be destroyed. Do not apply any mechanical shock to the signal terminals because it might be transformed into an electrical noise and input into the instrument.

● Protection of the case or operation panel

Do not pour volatile chemicals on the case or operation panel or leave any rubber or PVC product in contact with the case or operation panel for a prolonged period, otherwise the case and/or operation panel may be discolored or deformed.

3-2

● Cleaning

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

● Display screen

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

● After use

Disconnect the power cord from the wall outlet after use.

● Long absence of use

If the instrument will not be used for a prolonged period, remove the batteries (AA-size alkaline batteries or NiMH battery pack).

IM CW240E

Precautions for Using Clamp-on Probes

CAUTION

3.1 Precautions for Use

• The clamping CT (current transformer) is precision assembled to ensure high performance. When using a 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 dust and then make sure the clamping cores on both sides close smoothly

Preparation for Safe Measurements

IM CW240E

3-3

3.2 Connecting a Power Supply

To connect the instrument to a power supply, use the AC adapter(accessorie).

As backup power supply against a power failure, one of the following batteries can be used. Use them together with the AC adapter.

• Alkaline batteries (accessorie) See 3.2.2, Using Alkaline Batteries.

• NiMH battery pack (optional) See 3.2.3, Using a NiMH (Nickel-Hydrogen) Battery Pack.

3.2.1 Connecting the AC Adapter

● Before Connecting a Power Supply

There is a danger of electrical shock or damage to the instrument. Observe the following cautionary notes when handling the AC adapter.

WARN ING

• Use only the Yokogawa-supplied dedicated power cord.

• Check that the power source voltage matches the supply voltage rating of the AC adapter, and then connect the power cord to the outlet.

• Check that the power switch of the CW240 is turned OFF and then connect the power cord.

• If the CW240 is not used for a prolonged period, disconnect the AC adapter power cord from the outlet.

• Do not use any AC adapter other than the one (part number: 788011) dedicated to the CW240.

• Do not place any objects on the AC adapter or power cord, and do not let the power cord come into contact with a heating element.

• Always hold the plug of the power cord rather than holding and pulling the cord itself when disconnecting it from the outlet.

3-4

IM CW240E

Attach the filter to the cord.

3.2 Connecting a Power Supply

CW240 main unit

Approx. 10 cm

AC adapter

<4> Connect

<3> Connect

Clamp filter A1193MN

<2> Connect

<1> Check that the power switch

is turned OFF.

● Procedure for Connecting the AC Adapter

Follow the steps below to connect the AC adapter. <1> Check that the power switch of the CW240 is turned OFF.

(Attach the clamp filter to the output-side cable of the AC adapter.) <2> Connect the AC adapter plug to the CW240's AC adapter jack. <3> Connect the plug of the power cord supplied with the AC adapter to the

power connector of the AC adapter. <4> Connect the other end of the power cord to the power outlet that meets the

power rating (requirements):

● AC adapter's Power Rating

Supply voltage ratin 100 to 240 V AC Allowable supply voltage range 90 to 264 V AC Power supply frequency rating 50/60 Hz Allowable power supply frequency range 48 to 62 Hz Maximum power consumption 70 to 90 VA Output voltage rating of AC adapter 12 V DC Maximum output current rating of AC adapter 2.6 A

Preparation for Safe Measurements

IM CW240E

3-5

3.2 Connecting a Power Supply

3.2.2 Using Alkaline Batteries

NOTE

Alkaline batteries are the backup power for the AC adapter. Use them together with the AC adapter.

Type of alkaline batteries LR6 AA-type, 1.5 V

● Handling Precautions

Observe the following cautionary notes when handling alkaline batteries.

WARN ING

• Install the alkaline batteries so that the positive and negative polarities are correctly positioned. Otherwise, the battery fluid may leak or the batteries may explode.

• Do not attempt to disassemble the batteries, heat them up, or dispose of them in a fire.

• Do not short the batteries.

• Do not attempt to recharge the batteries.

• Do not solder the batteries.

• When replacing the batteries, replace all six units at the same time with new ones (of the same manufacturer). (Do not use manganese batteries as replacements.)

• If the CW240 will not be used for a prolonged period, remove the batteries.

3-6

● Backup Hours by Alkaline Batteries

The number of backup hours available using alkaline batteries varies with the operating environment and conditions. Refer to the table below.

Operating Conditions Backup Hours Available

LCD backlight OFF No access to a PC card

Approx. 30 minutes

IM CW240E

3.2 Connecting a Power Supply

● Indication of a Battery Voltage Decrease

When the CW240 is operated using alkaline batteries, the following mark appears. A decrease in the battery voltage (remaining capacity) is indicated in the following four steps:

→ → →

NOTE

If you continue to operate the CW240 with this mark displayed, the CW240 will be turned OFF automatically. Replace the alkaline batteries with new ones before this mark appears.

Preparation for Safe Measurements

IM CW240E

3-7

3.2 Connecting a Power Supply

● Procedure for Replacing Alkaline Batteries

Follow the steps below to replace alkaline batteries. <1> Check that the power switch is OFF and no AC adapter has been

connected.

<2> Raise the battery holder lock switch at the back of the CW240 to remove

the alkaline battery holder.

<3> Remove the old batteries from the battery holder and insert six new alkaline

batteries.

<4> Place the battery holder into the holder inlet of the CW240. Then slide the

battery holder into the slot, so that the battery holder connector connects properly with the battery connector.

<5> Lower the lock switch on the side of the CW240 to fix the holder.

(The indication changes to "䉭FREE".)

CAUTION

Place alkaline batteries into the holder with the positive (+) and negative (–) polarities of the batteries agreeing with the polarity indications in the holder.

CW240 main unit

3-8

<1> Check that the

power switch is turned OFF.

CW240 main unit

Lock switch

<2> Remove

<3> Insert

<4> Insert

<5> Lock

IM CW240E

3.2 Connecting a Power Supply

3.2.3 Using a NiMH (Nickel-Hydrogen) Battery Pack

NOTE

A NiMH battery pack is backup power for the AC adapter. Use it together with the AC adapter.

Charging type NiMH battery pack (optional) model: 94004

Specifications Voltage : 7.2 V

Capacity : 2100 mAh Number of times chargeable (cycle life)

: approx. 300 times (depending on the operating

environment)

● Handling Precautions

Observe the following cautionary notes when handling the NiMH battery pack.

WARNI N G

• The electrolyte solution contained in the NiMH battery pack is alkaline. If it comes into contact with any clothing or skin due to a leakage from or rupture in the battery pack, the clothing or skin may be damaged. In particular, if the solution gets into an eye, it may cause loss of eyesight. In such a case, do not rub the affected eye, but thoroughly wash it immediately with clean water. Then see a doctor quickly for treatment.

• When replacing the NiMH battery pack, always turn the CW240 power switch OFF and disconnect the AC adapter power cord from the outlet to avoid possible danger such as a short in the electric circuit or electrical shock.

• Do not use any battery pack other than Yokogawa's NiMH battery pack (model: 940 04).

• Do not leave the NiMH battery pack in strong direct sunlight, inside a vehicle under the hot sun, or near a fire, otherwise it may result in a solution leakage or deterioration in the performance and/or life.

• Do not disassemble or modify the NiMH battery pack, otherwise the protective features of the battery pack may be damaged, resulting in a heating up or rupture.

• Do not short the NiMH battery as this may cause burns due to the battery pack heating up.

• Do not dispose of the battery pack in a fire or apply heat to it, otherwise there is a risk that it will rupture or its electrolyte solution will scatter.

• Do not apply excessive shock to the battery pack, for example, by throwing it. Doing so may cause solution leakage, battery pack heating, or rupture.

Preparation for Safe Measurements

IM CW240E

3-9

3.2 Connecting a Power Supply

WARN ING

• Do not use a defective battery pack, such as any leaking solution, deformed, discolored, or showing any other abnormality.

• Avoid any metal coming into contact with the battery pack when carrying it, as there is a danger of a short.

• Do not immerse the battery pack in water or make it wet. Otherwise, it may heat up or rust as well as leading to a loss of functions.

• If the battery pack is not used for a prolonged period, remove it from the CW240 and store it in the following environment. Storage period of 1 year or less:

Temperature of -20°C to 35°C (in locations with low humidity)

Storage period of 3 months or less:

Temperature of -20°C to 45°C (in locations with low humidity)

● Procedure for Installing the NiMH Battery Pack

Follow the steps below to install the dedicated NiMH battery pack.

<1> Check that the power switch is turned OFF. <2> If the AC adapter is in use, disconnect the power cord of the AC adapter

from the outlet.

CW240 main unit

3-10

<2> Check that the power plug

is disconnected.

AC adapter

<1> Check that the power switch

is turned OFF.

IM CW240E

Lock switch

3.2 Connecting a Power Supply

<3> Remove

<4>

Insert

NiMH battery pack

<5> Lock

<3> If using alkaline batteries, raise the lock switch at the back of the CW240 to

remove them from the battery holder. Then install the NiMH battery pack into the holder.

<4> Place the battery holder into the holder inlet of the CW240. Slide the battery

holder into the slot, so that the battery holder connector connects properly with the battery connector.

<5> Lower the lock switch on the side of the CW240 to fix the holder.

(The indication changes to "䉭FREE".)

● Recharging the NiMH Battery Pack

When shipped from the factory, the dedicated NiMH battery pack (optional) is not fully charged for safety reasons. Recharge the battery pack to its full level before use. When recharging it, use the CW240 and AC adapter.

WARNI N G

• When recharging the NiMH battery pack, always do so using the CW240 main unit.

• When recharging the NiMH battery pack, keep the ambient temperature within the range from 10°C to 35°C. Recharging the battery pack outside this range may result in an insufficient amount of charge, solution leakage, or battery heating.

Preparation for Safe Measurements

IM CW240E

3-11

3.2 Connecting a Power Supply

● Procedure for Recharging the NiMH Battery Pack

Follow the steps below to recharge the NiMH battery pack.

<1> With the battery pack installed as instructed above, connect the AC adapter

to the CW240.

<2> The LED indicator on the side of the AC adapter jack comes on, indicating

that the battery pack is being recharged. When recharging is complete, the LED indicator goes off.

NOTE

The NiMH battery pack will be recharged regardless of the ON/OFF of the power switch. In this case, power is supplied through the AC adapter.

TIP

When the LED indicator is flashing, the CW240 is in a waiting-to-be-recharged state. The CW240 falls into this state if:

• the ambient temperature is outside the 10°C to 35°C range,

• the battery performance is significantly low due to over-discharge or for other reasons,

• the battery temperature has exceeded 55°C during recharging, or

• the ambient temperature has changed abruptly.

3-12

● Indication that Recharging is Required

When the CW240 is operated using the NiMH battery pack, the following mark appears. A decrease in the battery voltage (remaining capacity) is indicated in the following four steps:

→ → →

NOTE

If you continue to operate the CW240 with this mark displayed, the CW240 will be turned OFF automatically. Recharge the NiMH battery pack before this mark appears.

IM CW240E

3.2 Connecting a Power Supply

● Backup Hours with a NiMH Battery Pack

The number of backup hours available using a NiMH battery pack vary with the operating environment and conditions. Refer to the table below.

Operating Conditions Backup Hours Available

LCD backlight OFF No access to a PC card

● NiMH Battery Life

The NiMH battery pack can be recharged approximately 300 times, though the frequency depends on the operating environment. The life of the battery pack is over if the low-battery mark appears soon after the battery pack has been fully recharged. Replace the battery pack with a new one.

Approx. 3 hours

Preparation for Safe Measurements

IM CW240E

3-13

3.3 Connecting Voltage Probes

LL1

V INPUT

600V

MAX

TERMINALS 600V

MAX

O EAR

LOGIC NIPUT

T/ST

5.5V MAX

LOGIC NIPUT

5.5V MAX

WARN ING

• For safety, connect voltage probes to the CW240 main unit and then to the

circuit under test.

• Before attaching a voltage probe to the circuit under test, turn off power to the

circuit under test. It is very dangerous to connect or disconnect a voltage probe without turning off the circuit under test.

• Be sure to connect voltage probes to the secondary side of the circuit under

test such as current limiters (circuit breakers). Should an accident such as a short occur, other circuits will be protected by these circuit breakers.

• Be extremely careful not to connect a voltage circuit to the current input ter-

minals or a clamp-on probe to the voltage input terminals. An improper connection may result in not only damage to the circuit or equipment under test or the CW240, but also an injury to personnel.

• Voltage input terminals N, U1, U2, and U3 are not isolated from each other. Do

not connect any voltage probes not required (not used) for measurements. Also, do not touch voltage input terminals not used.

• For measurements, do not use any voltage probes other than those supplied

with the product.

T/ST

HL H

LOGIC NIPUT

ART/STOP

5.5V M

LOGIC NIPUT

5.5V M

TO EAR

〜 MAX

TERMINALS 600V

〜MAX

600V

V INPUT

Voltage probes, red, yellow, or blue

Voltage probe, black (N terminal)

3-14

Insert the plug so that it is fastened with a voltage input terminal securely.

IM CW240E

3.4 Connecting Clamp-on Probes

LL1

V INPUT

600V

MAX

TERMINALS 600V MAX

O EAR

LOGIC NIPUT

5.5V MAX

LOGIC NIPUT

5.5V MAX

WARNI N G

• For safety, connect a clamp-on probe to the CW240 main unit and then to the circuit under test.

• Before clamping a clamp-on current probe onto the circuit under test, turn off power to the circuit under test. It is very dangerous to clamp or unclamp the clamp-on probe without turning off the circuit under test.

• Be sure to connect a clamp-on probe to the secondary side of the circuit under test such as current limiters (circuit breakers). Should an accident such as a short occur, other circuits will be protected by these circuit breakers.

• Be extremely careful not to connect a voltage circuit to the current input terminals or a clamp-on probe to the voltage input terminals. An improper connection may result in not only damage to the circuit or equipment under test or the CW240, but also an injury to personnel.

• Do not connect any clamp-on probe not required (not used) for measurement.

• For measurements, do not use any current probes other than those dedicated to the CW240.

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

Ring markers

<1>

<2>

Clamp-on current probe

START/STOP

L H

LOGIC NIPUT

L H

ART/STOP

HL H

.5V M

LOGIC NIPUT

5.5V M

TO EA

600V M

ALS

ERM

V INPUT

Preparation for Safe Measurements

● Use of Ring Markers

• When using multiple clamp-on probes, attach ring markers (four colors) to the probes. This allows inputs to be identified. Attach ring markers of the same color to the current probe side <1> and connector side <2> of the cable of a clamp-on probe.

• When attaching ring markers, exercise care not to damage the clamp-on probes.

IM CW240E

3-15

3.4 Connecting Clamp-on Probes

● Connecting Clamp-on Probes

When connecting a clamp-on probe to the CW240 main unit, connect the plug of the clamp-on probe so that the groove in the plug agrees with the guide in the CW240 main unit (that the H and L polarities are correctly connected).

● Types of Clamp-on Probes

Clamp-on probes that can be connected to the CW240 are available in the following seven types. The CW240's current range setting changes depending on the clamp-on probes in use.

Model

96036 (for 2 A) 96033 (for 50 A) 96030 (for 200 A) 96031 (for 500 A) 96032 (for 700 A)

1000 A (for 5 minutes)

96034 (for 3000 A)

96034-1

96034_2

96034_3

96035 (for 3000 A)

96035_1

96035_2

CW240 Current Range

200 mA/500 mA/1 A/2 A

5 A/10 A/20 A/50 A

20 A/50 A/100 A/200 A

50 A/100 A/200 A/500 A

200 A/500 A/1000 A

Current range is selectable using a switch.

300 A/750 A/1500 A/3000 A

200 A/500 A/1000 A/2000 A

100 A/200 A/500 A/1000 A

Current range is selectable using a switch.

300 A/750 A/1500 A/3000 A

30 A/75 A/150 A/300 A

CAUTION

When connecting a clamp-on probe, always check that the rating of the current under test agrees with the rating of the clamp-on probe, including model number check.

3-16

IM CW240E

3.5

Connection Diagrams of Voltage Probes and Clamp-on Probes

Single-phase two-wire/Single load (1P2W)

Black

Red

Single-phase two-wire/Three loads (1P2W)

Black

Red

Load 1

Load 1 Load 2 Load 3

Single-phase two-wire/Two loads (1P2W)

Black

Single-phase two-wire/Four loads (1P2W)

Black

Load 1 Load 2

Red

Load 2 Load 3

Load 1 Load 4

Red

Preparation for Safe Measurements

IM CW240E

3-17

3.5 Connection Diagrams of Voltage Probes and Clamp-on Probes

Single-phase three-wire/Single load (1P3W)

N12

Black

Red

Yellow

Load 1 Load 2

Single-phase three-wire three-current (1P3W3I) <Measurement of neutral line current>

N12

Black

Red

Yellow

12 N

Single-phase three-wire/Two loads (1P3W)

Load 1 Load 2

N12

Black

Red

Yellow

1212

3-18

IM CW240E

3.5 Connection Diagrams of Voltage Probes and Clamp-on Probes

Three-phase three-wire two-current/ Single load (3P3W2I) <Two-power-meter method>

SR T

Black

Red

Blue

Three-phase three-wire two-current/ Two loads (3P3W2I) <Two-power-meter method>

Load 1 Load 2

SR T

Black

Red

RTRT

Blue

Preparation for Safe Measurements

Three-phase three-wire three-current (3P3W3I) <Three-power-meter method>

RST R S T

Red

Yellow

Blue

IM CW240E

3-19

3.5 Connection Diagrams of Voltage Probes and Clamp-on Probes

Three-phase four-wire (3P4W)

N1 32

Black

Red

Yellow

123

Blue

Three-phase four-wire four-current (3P4W4I) <Measurement of neutral line current>

N1 32

Black

Red

Yellow

123N

Blue

3-20

IM CW240E

3.5 Connection Diagrams of Voltage Probes and Clamp-on Probes

Scott connection (3P3W+1P3W) Single-phase (1P3W) connection: R-S

Preparation for Safe Measurements

Scott connection (3P3W+1P3W) Single-phase (1P3W) connection: S-T

Three-phase 3-wire

NR TS

Black

Red

Single phase

1 (R)2 (S)R T

Yellow

Blue

Scott connection (3P3W+1P3W) Single-phase (1P3W) connection: T-R

Three-phase 3-wire

NR TS

Black

Red

Single phase

1 (T)2 (R)R T

Yellow

Blue

NR TS

Black

Red

Single phase

1 (S)2 (T)R T

Yellow

Blue

Three-phase 3-wire

IM CW240E

3-21

3.6 Turning ON the Power Switch

[ 1 Model Name Screen

When the power switch is turned ON, the CW240 displays the following startup screen for approx. 2 seconds.

2 Message Screen

This screen displays the model, version number, the presence of options, and self-check results.

CW240 Ver 1.00 FPGA Check OK SDRAM Check OK SRAM Check OK Flash Disk Check OK RTC Check OK EEPROM Check OK Setting Check OK Option:Analog In/Out

3 When the self-check has been completed normally, the screen displayed when

you previously turned OFF the CW240 appears.

To switch to the Top Menu screen shown on the left, press the TOP MENU key.

TOP

key

3-22

IM CW240E

3.6 Turning ON the Power Switch

● Description of the Message Screen

Indications

1 CW240 VER 1.00

Self-check

2 FPGA Check OK

3 SDRAM Check OK

4 SRAM Check OK

5 Flash Disk Check OK

6 RTC Check OK

7 EEPROM Check OK

8 Setting Check OK

9 Option:Analog In/Out

Model and version number

FPGA check

SDRAM check

SRAM check

Check of the flash file system (internal memory)

Check of the real-time clock

EEPROM Check

Setting data check

Option specifications The example shows the presence of analog I/O.

Description

CAUTION

If an error is detected by the self-check (3 to 8 items), the information about the error is displayed. For countermeasures, see Chapter 16, Maintenance Troubleshooting.

Preparation for Safe Measurements

IM CW240E

3-23

3.7 Performing Measurements with Greater Precision

• After turning the power switch on, let the CW240 warm up (for more than 30 minutes) before starting to perform measurements.

• To perform measurements with higher precision, use the CW240 under the following environment conditions: Ambient temperature: 23 ± 5°C Ambient humidity: 35 to 75% R.H (no condensation)

If the CW240 is installed in a location where the ambient humidity is less than 30%, use an antistatic mat, etc. to prevent electrostatic discharge.

If you move the CW240 from a location of low temperature and humidity to a location of high temperature and humidity or, if there is an abrupt change in the ambient temperature, condensation may occur in the CW240. If this happens, let the CW240 stand still for at least an hour to allow it to adapt to the new ambient temperature and for any condensation to dissolve. Then begin operating the CW240.

• Supply the power of sine waves at 50 Hz/60 Hz.

• When using a clamp-on probe, pay attention to the following points:

<1> When performing measurements, hold the clamp-on probe so that the

conductor cable runs through the center of the clamping CT.

<2>

Ensure that the orientation of the clamp to the direction of the conductor cable (from the power supply to the load) is correct, as shown on the right.

<3> Ensure that the clamping CT is properly closed.

Power supply side

Conductor cable

(SOURCE)

Joint section

Clamping CT

Load side (LOAD)

TIP

The CW240 obtains the measured value from voltage and current inputs.

(For computation equations, see Chapter 17, CW 240 Specifications.)

There may be cases where the CW240 shows a measurement value different from those obtained by other equipment with different operation principles or computation equations.

3-24

IM CW240E

Chapter 4 Wiring

4.1 Precautions for Wiring

to the Measurement Circuit ...................... 4-2

4.2 Installing the CW240 ................................. 4-3

4.3 Setting up Wiring ...................................... 4-5

4.4 Setting up the Number of Loads .............. 4-6

4.5 Carrying out Wiring .................................. 4-7

4.6 Wiring the Measurement Circuit

Using External VT/CT.............................. 4-23

4.7 Checking Wiring ..................................... 4-24

Chapter 4

4.1 Precautions for Wiring to the Measurement Circuit

WARN ING

• Before carrying out wiring, be sure to read through 3.3, Connecting Voltage

Probes, and 3.4, Connecting Clamp-on Probes.

• Do not apply an input exceeding the following value to the voltage input

terminals.

Maximum allowable input : 1000 V rms For measurement category III : 600 V rms

• The maximum allowable input and maximum operating circuit voltage of the

clamp-on probes are as specified in the table below. Do not apply an input exceeding the relevant value or use the CW240 at a circuit voltage exceeding it.

Model Current Rating

96036 2 A 20 A 50 V/CAT.III

96033 50 A 60 A 300 V/CAT.III

96030 200 A 250 A 300 V/CAT.II, 600 V/CAT.II

96031 500 A 625 A 300 V/CAT.II, 600 V/CAT.II

96032 700 A (continuous) 700 A (continuous) 600 V

1000 A (for 5 min) 1000 A (for 5 min)

96034 1000/2000/3000 A 2400 A (continuous) 600 V/CAT.III

96035 300/3000 A 360/360 A 1000 V/CAT.III (area to be measured)

Maximum

Allowable Input

3600 A (for 10 min)

Maximum Operating Circuit Voltage/

Measurement Category

SEE ALSO

For more information, see Chapter 17, CW 240 Specifications.

WARN ING

• If using an external VT (voltage transformer) or CT (current transformer), make

sure the transformer can sufficiently withstand the voltage to be measured.

• Be careful not to allow the secondary side of CT to become open-circuited

while the CT is being energized. Otherwise, a high voltage may develop on the secondary side, posing extreme risks.

4-2

IM CW240E

4.2 Installing the CW240

Install the CW240 in locations meeting the following conditions:

● Location

Indoor

● Ambient Temperature and Humidity

• Ambient temperature : 5°C to 40°C

• Ambient humidity : 5 to 85% R.H (no condensation)

● Operating Altitude

• 2000 m max. above sea level

● Measurement Category (CAT.)

The measurement category of the CW240 is III.

Wiring

Measurement

SEE ALSO

For more information on settings, see Section 6.2, General Settings 1/2, in Chapter 6, Configuring Settings.

IM CW240E

4-5

4.4 Setting up the Number

of Loads

The number of loads can be set up on the GENERAL 1/2 screen.

● General 1/2

TOP

ENTER

START

&STOP

F2F3F4F

TOP

LIGHT

RANGE

ESC

SAVE

ENTER

DISP COPY

● Changing the Number of Loads

1 Using the Up and Down cursor key, select LOAD (highlighted).

The function key labels change.

Load 1 Load 2 Load 3 Load 4

F1F

Default: Load 1

2 Set the number of loads using the corresponding function key.

F1F

● For Scott Connections

If wiring is set to 3P3W+1P3W(Scott connection), the setting of 1P connection is displayed (instead of the number of loads).

SEE ALSO

For more information on settings, see Section 6.2, General Settings 1/2, in Chapter 6, Configuring Settings.

4-6

IM CW240E

4.5 Carrying out Wiring

V INPUT

600V MAX

TERMINALS 600V MAX

O EAR

LOGIC NIPUT

T/ST

5.5V MAX

LOGIC NIPUT

T/ST

5.5V MAX

WARNI N G

• When attaching voltage probes to or clamping a clamp-on probe on the circuit under test, turn off power to the circuit under test. It is very dangerous to connect or disconnect a voltage probe or clamp or unclamp a clamp-on probe without turning off the circuit under test.

• Be sure to connect voltage probes to or clamp a clamp-on probe on the secondary side of the circuit under test, such as current limiters (circuit breakers). Should an accident such as a short occur, other circuits will be protected by these circuit breakers.

Power supply

side

Circuit breaker

Orientate the clamp-on probe so that the arrows on the clamping CT faces the correct direction.

Power supply side

Clip voltage probes securely onto metal parts such as screws or wiring bars.

T/ST

LOGIC NIPUT

T/ST

5.5V MAX

TO EAR

LOGIC NIPUT

TERMINALS 600V MAX

600V MAX

V INPU

Wiring

Direction marks

Load side

IM CW240E

4-7

4.5 Carrying out Wiring

4.5.1 Single-phase Two-wire / Single Load (1P2W)

● WIRING DIAGRAM Screen ● WIRING CHECK Screen

● Actual Wiring

Power

supply

Black

Red

SEE ALSO

For more information on wiring checks, see Section 4.7, Checking Wiring.

Load

4-8

IM CW240E

4.5 Carrying out Wiring

4.5.2 Single-phase Two-wire / Two Loads (1P2W)

The CW240 can simultaneously measure multiple loads of the same power supply (voltage shared).

● WIRING DIAGRAM Screen ● WIRING CHECK Screen

● Actual Wiring

Wiring

Power

supply

Black

Red

SEE ALSO

For more information on wiring checks, see Section 4.7, Checking Wiring.

Load

IM CW240E

4-9

4.5 Carrying out Wiring

4.5.3 Single-phase Two-wire / Three Loads (1P2W)

The CW240 can simultaneously measure multiple loads of the same power supply (voltage shared).

● WIRING DIAGRAM Screen ● WIRING CHECK Screen

● Actual Wiring

Power

supply

Black

Red

SEE ALSO

For more information on wiring checks, see Section 4.7, Checking Wiring.

Load

4-10

IM CW240E

4.5 Carrying out Wiring

4.5.4 Single-phase Two-wire / Four Loads (1P2W)

The CW240 can simultaneously measure multiple loads of the same power supply (voltage shared).

● WIRING DIAGRAM Screen ● WIRING CHECK Screen

● Actual Wiring

Wiring

Power

supply

Black

Red

SEE ALSO

For more information on wiring checks, see Section 4.7, Checking Wiring.

Load

IM CW240E

4-11

4.5 Carrying out Wiring

4.5.5 Single-phase Three-wire / Single Load (1P3W)

● WIRING DIAGRAM Screen ● WIRING CHECK Screen

● Actual Wiring

Power

supply

Black

Red

Yellow

SEE ALSO

For more information on wiring checks, see Section 4.7, Checking Wiring.

Load

4-12

IM CW240E

4.5 Carrying out Wiring

4.5.6 Single-phase Three-wire / Two Loads (1P3W)

The CW240 can simultaneously measure multiple loads of the same power supply (voltage shared).

● WIRING DIAGRAM Screen ● WIRING CHECK Screen

● Actual Wiring

Wiring

Power

supply

Black

Red

Yellow

SEE ALSO

For more information on wiring checks, see Section 4.7, Checking Wiring.

Load

IM CW240E

4-13

4.5 Carrying out Wiring

4.5.7 Single-phase Three-wire Three-current (1P3W3I) <Measurement of neutral line current>

● WIRING DIAGRAM Screen ● WIRING CHECK Screen

● Actual Wiring

Power

supply

Black

Red

Yellow

SEE ALSO

For more information on wiring checks, see Section 4.7, Checking Wiring.

Load

4-14

IM CW240E

4.5 Carrying out Wiring

4.5.8 Single-phase Three-wire Two-current / Single Load (3P3W2I) <Two-power-meter method>

● WIRING DIAGRAM Screen ● WIRING CHECK Screen

● Actual Wiring

Wiring

Power

supply

Black

Red

Blue

SEE ALSO

For more information on wiring checks, see Section 4.7, Checking Wiring.

Load

IM CW240E

4-15

4.5 Carrying out Wiring

4.5.9 Single-phase Three-wire Two-current / Two Loads (3P3W2I) <Two-power-meter method>

The CW240 can simultaneously measure multiple loads of the same power supply (voltage shared).

● WIRING DIAGRAM Screen ● WIRING CHECK Screen

● Actual Wiring

Power

supply

Black

Red

Blue

SEE ALSO

For more information on wiring checks, see Section 4.7, Checking Wiring.

4-16

Load

IM CW240E

4.5 Carrying out Wiring

4.5.10 Three-phase Three-wire Three-current (3P3W3I) <Three-power-meter method>

● WIRING DIAGRAM Screen ● WIRING CHECK Screen

● Actual Wiring

Wiring

Power

supply

Black

Red

Blue

NOTE

Do not connect a wire to terminal N of the voltage input terminals.

SEE ALSO

For more information on wiring checks, see Section 4.7, Checking Wiring.

Load

IM CW240E

4-17

4.5 Carrying out Wiring

4.5.11 Three-phase Four-wire (3P4W)

● WIRING DIAGRAM Screen ● WIRING CHECK Screen

● Actual Wiring

Power

supply

Black

Red

Yellow

Blue

SEE- ALSO

For more information on wiring checks, see Section 4.7, Checking Wiring.

Load

4-18

IM CW240E

4.5 Carrying out Wiring

4.5.12 Three-phase Four-wire Four-current (3P4W4I) <Measurement of neutral line current>

● WIRING DIAGRAM Screen ● WIRING CHECK Screen

● Actual Wiring

Wiring

Power

supply

Black

Red

Yellow

Blue

SEE ALSO

For more information on wiring checks, see Section 4.7, Checking Wiring.

Load

IM CW240E

4-19

4.5 Carrying out Wiring

4.5.13 Scott Connection (3P3W+1P3W)

Single phase (1P3W) connection: R-S

● WIRING DIAGRAM Screen ● WIRING CHECK Screen

● Actual Wiring

Power supply

Black

Red

Yellow

Blue

SEE ALSO

For more information on wiring checks, see Section 4.7, Checking Wiring.

Three-phase,

3-wire

Load

Single-phase,

3-wire

Load

4-20

IM CW240E

4.5 Carrying out Wiring

4.5.14 Scott Connection (3P3W+1P3W)

Single phase (1P3W) connection: S-T

● WIRING DIAGRAM Screen ● WIRING CHECK Screen

● Actual Wiring

Wiring

Power

supply

Black

Red

Yellow

Blue

SEE ALSO

For more information on wiring checks, see Section 4.7, Checking Wiring.

Three-phase,

3-wire

Load

Single-phase,

3-wire

Load

IM CW240E

4-21

4.5 Carrying out Wiring

4.5.15 Scott Connection (3P3W+1P3W)

Single phase (1P3W) connection: T-R

● WIRING DIAGRAM Screen ● WIRING CHECK Screen

● Actual Wiring

Power

supply

Black

Red

Yellow

Blue

SEE ALSO

For more information on wiring checks, see Section 4.7, Checking Wiring.

Three-phase,

3-wire

Load

Single-phase,

3-wire

Load

4-22

IM CW240E

4.6 Wiring the Measurement Circuit Using External VT/CT

WARNI N G

• When using an external CT, be careful not to allow the secondary side of the

CT to become open-circuited while the primary side is being energized, otherwise, a high voltage may develop on the secondary side, posing extreme risks.

• The current under test flows though the thick lines shown in the figure below.

For these, use wires that have an adequate margin of current-carrying capacity.

If the maximum voltage or current level of the circuit under test exceeds the maximum measurement range of the CW240, use an external VT and/or CT. This strategy enables the measurement of the voltage or current level.

Example of Single-phase 2-wire (1P2W)

Power supply

(voltage transformer)

Load

CT (current transformer)

艎

Wiring

TIP

• If using VT and/or CT, setting the VT ratio and/or CT ratio allows the CW240 to

display the primary-side value.

• When the secondary side of the CT is rated at 5 A, it is recommended that the 96033

(for 50 A) clamp-on probe be used in the 5 A range.

SEE ALSO

For how to set a VT or CT ratio, see 6.2.7, Setting Up VT Ratio and CT Ratio.

IM CW240E

4-23

4.7 Checking Wiring

WARN ING

Checking wiring is important for ensuring safe and accurate measurements. Refer to Chapters 3 and 4 to carry out the necessary precautions for safe measurement and ensure that the connections have been made correctly.

Check that the connections of the voltage probes and the connector H/L orientation and measurement positions of the clamp-on probe are correct.

• Press the F1 key (DISPLAY CHANGE) on the MEASURE screen to select the WIRING CHECK screen.

• The following item is indicated on WIRING CHECK screen. Rms value of voltage input and Current input, and phase angle and vector diagram related to U1.

Voltage(rms):U1 Phase angle

(relative to U1)

Current(rms):I1

vector diagram

displayed

Phase angle

(relative to U1)

4-24

F1F

3F4

Judgment result

F1F1

F3 F4

Use the F3 key to switch between the measured value and judgment result displays.

To change the wiring to 3P3W+1P3W (Scott connection), press the F4 key to display the connection destination of a single-phase load.

IM CW240E

4.7 Checking Wiring

NOTE

• As the CW240 performs a wiring check based on the conditions shown below to judge if the wiring is accepted (OK) or rejected (NG), there may be cases where the result of the check may show what is actually correct wiring as NG and vice versa. For this reason, also check for an error in the vector diagram or measured values.

• The rms values, phase angles, and vector diagram displayed are based on the fundamental components of voltage and current inputs.

● Wiring Check Items and Error Conditions - 1

Item

Voltage input

Current inpu

Phase difference (voltage - current)

Voltage phase

10% or less of the rated range

1% or less of the rated range For 1P3W3I or 3P4W4I, I4 is not judged.

• The result of voltage input judgment is NG.

• For any system other than 3P3W2I or 3P3W3I: Each current does not fall within a range of ±60° based on each phase voltage

• For 3P3W2I: I1 does not fall within a range of +90° to -30° relative to U1 I3 dose not fall within a range of +90° to -30° relative to U2

• For 3P3W3I: Each current does not fall within a range of +90° to -30° based on each phase voltage

• For Scott connections: A combination of single-phase 3-wire and three-phase 3-wire 2-current

• The result of voltage input judgment is NG.

• For 1P3W or 1P3W3I: U2 does not fall within a range of 180° ±20% with respect to U1.

• For 3P3W2I: U2 leads U1 and does not fall within a range of 60° (leading)

• For 3P3W3I, 3P4W, or 3P4W4I: U2 lags behind U1 and does not fall within a range of 120°(lagging) ± approx. 20° relative to U1, or U3 leads U1 and does not fall within a range of 120°(leading) ± approx. 20° relative to U1.

Error Conditions

± approx. 20° relative to U1.

Wiring

IM CW240E

4-25

4.7 Checking Wiring

● Wiring Check Items and Error Conditions - 2

Item

Current phase

Frequency source

Scott connection

Error Conditions

• The result of current input judgment is NG.

• For 3P3W2I: The phase of I3 lags behind that of I1.

• For 3P3W3I, 3P4W, or 3P4W4I: The phase of I3 lags behind that of I1 or the phase of I2 leads that of I1.

• Frequency measurement is unstable.

• Input frequency is 40 Hz or less, or 70 Hz or more.

When the connection setting of a single-phase, 3-wire load is set to:

• R-S phase, V1n+V2n = 10% or more of voltage rating

• S-T phase, V2n+V3n = 10% or more of voltage rating

• T-R phase, V3n+V1n = 10% or more of voltage rating

4-26

IM CW240E

4.7 Checking Wiring

● If the results of one or more wiring check are NG, check the following:

Results

Voltage input judgment is NG.

Current input judgment is NG.

Phase difference judgment (voltage - current) is NG.

Voltage phase judgment is NG.

Current phase judgment is NG.

Frequency source check is NG.

Scott connection check is NG.

•

Check if the voltage probes are connected properly to the circuit under test.

•

Check if the voltage probes are connected properly to the voltage input terminals of the product.

•

Check if the voltage range is appropriate to the input level.

• Check if the clamp-on probe(s) is clamped onto the circuit under test properly.

• Check if clamp-on probe(s) is connected to the current input terminal of the product properly.

• Check if the current range is appropriate to the input level.

• Check if the voltage phase sequence is correct.

• Check if the direction of the arrows and the phase of the clamp-on probe(s) are correct.

• Check if the voltage phase sequence is correct.

• Check if the circuit under test and the setting of the wiring system agree with each other.

• Check if the direction of the arrows and the phase of the clamp-on probe(s) are correct.

• Check if the circuit under test and the setting of the wiring system agree with each other.

• Check if the voltage input selected for the frequency source is stable.

• Check if the voltage probes selected for the frequency source are connected properly.

• Check if the connection setting of the single-phase 3-wire load agrees with the circuit under test in the Scott connection.

• Check if the voltage phase sequence is correct.

Measures

Wiring

IM CW240E

4-27

Chapter 5 Setting Ranges Using the Direct Keys

Chapter 5 Setting Ranges Using the

Direct Keys

5.1 Setting the Voltage Range ........................ 5-2

5.2 Setting the Current Range ........................ 5-4

5.3 Ranges and Number of Digits .................. 5-6

Chapter 5 Setting Ranges Using the Direct Keys

5.1 Setting the Voltage Range

F2 F 3 F 4 F 5

START

&STOP

LIGHT

[ 1 Voltage Range Direct Key

RANGE

Press the U RANGE key once.

This causes the voltage range indication to be highlighted, changing the function key labels to voltage ranges.

RANGE

TOP

RANGE

ENTER

ESC

SAVE

DISP COPY

150V 300V 600V 1000V

F1F

Default: 150 V

2 Setting the Voltage Range

F1F

to F4 Press the corresponding function key to set the voltage range.

The voltage range changes to the selected one, returning the screen to the MEASURE screen.

TIP

If you do not want to change the voltage range, press the U RANGE key again or press the ESC key once. This causes the screen to return to the MEASURE screen.

5-2

IM CW240E

5.1 Setting the Voltage Range

NOTE

If the result of "power rating ⫻ VT ratio ⫻ CT ratio ⫻ 1.3" exceeds 999.9 TW, the voltage range cannot be changed. To change the voltage range in this case, modify other settings (wiring, current range, clamp-on probe type, VT ratio, and/ or CT ratio) and then change it.

TIP

• A voltage range cannot be set during integration measurement (including when on standby).

• A voltage range cannot be set in the VOLT. QUALITY or WIRING DIAG. screen.

• If integral measured data has not been cleared, the voltage range cannot be set. To change the voltage range in this case, press the F5 key (HOLD/CLEAR) for more than 3 seconds on the MEASURE screen to clear integral measured data and then change it.

Setting Ranges Using the Direct Keys

IM CW240E

5-3

5.2 Setting the Current Range

F2 F 3 F 4 F 5

START

&STOP

LIGHT

[ 1 Current Range Direct Key

RANGE

Press the A RANGE key once.

This causes the current range indication to be highlighted, changing the function key labels to current ranges.

(The contents of the function key labels vary depending on the clamp-on probe to be used.)

20A 50A 100A 200A

F1F

Default: 20 A (when clamp-on probe 96030 has been set)

The default is the minimum range of each clamp-on probe.

RANGE

TOP

RANGE

ENTER

ESC

SAVE

DISP COPY

2 Setting the Current Range

F1F

Press the corresponding function key to set the current range.

The current range changes to the selected one, returning the screen to the MEASURE screen.

TIP

If you do not want to change the current range, press the A RANGE key again or press the ESC key once. This causes the screen to return to the MEASURE screen.

5-4

IM CW240E

5.2 Setting the Current Range

● Types of Clamp-on Probes and Current Ranges

Models of Clamp-on

Probes

96036 200mA 500mA 1A 2A

96033 5A 10A 20A 50A

96030 20A 50A 100A 200A

96031 50A 100A 200A 500A

96032 200A 500A 1000A

96034_1 300A 750A 1500A 3000A

96034_2 200A 500A 1000A 2000A

96034_3 100A 200A 500A 1000A

96035_1 300A 750A 1500A 3000A

96035_2 30A 75A 150A 300A

96034 or 96035: Current range is selected using the switch on a clamp-on current probe.

F1 F2 F3 F4

Function Keys

NOTE

• The current ranges to be selected differ depending on the clamp-on current probe to be used.

• For measurements of multiple loads, a current range can be set for each load. For this, press the F2 key (LOAD CHANGE) to select the load for which you wish to change the current range and then set the current range.

• If the wiring system is 1P3W3I or 3P4W4I, you cannot use the A RANGE key to set the current range of I4. To set this current range, move to the SETUP screen and then set it.

• If the wiring system is a Scott connection, a current range can be set separately for the three-phase three-wire and single-phase three-wire sides. For this, press the F2 key (3P3W or 1P1W) to select the wiring for which you wish to change the current range and then set the current range.

• If the result of "power rating ⫻ VT ratio ⫻ CT ratio ⫻ 1.3" exceeds 999.9 TW, the current range cannot be changed. To change the current range in this case, modify other settings (wiring, voltage range, clamp-on probe type, VT ratio, and/or CT ratio) and then change it.

Setting Ranges Using the Direct Keys

TIP

• A current range cannot be set during integration measurement (including when on standby).

• A current range cannot be set in the VOLT. QUALITY or WIRING DIAG. screen.

• If integral measured data has not been cleared, the current range cannot be changed. To change the current range in this case, press the F5 key (HOLD/CLEAR) for more than 3 seconds on the MEASURE screen to clear integral measured data and then change it.

IM CW240E

5-5

5.3 Ranges and Number of Digits

This section describes the voltage, current, power, and electric energy ranges.

● Voltage Ranges

150/300/600/1000 V

● Current Ranges

Current ranges vary depending on the clamp-on probe to be used.

Clamp-on Probe

96036 200mA 500mA 1A 2A

96033 5A 10A 20A 50A

96030 20A 50A 100A 200A

96031 50A 100A 200A 500A

96032 200A 500A 1000A

96034_1 300A 750A 1500A 3000A

96034_2 200A 500A 1000A 2000A

96034_3 100A 200A 500A 1000A

96035_1 300A 750A 1500A 3000A

96035_2 30A 75A 150A 300A

96034 or 96035: Current range is selected using the switch on a clamp-on probe.

● Active and Reactive Power Ranges

The active and reactive power ranges are determined as shown below depending on the voltage range, current range, and/or wiring system (wiring).

Wiring System (Wiring)

1P2W

1P3W

1P3W3I

3P3W2I

3P3W3I

3P3W+1P3W*

3P4W

3P4W4I

*: Scott connection

Power Range

Voltage range ⫻ current range

Voltage range ⫻ current range ⫻ 2

Voltage range ⫻ current range ⫻ 3

Current Range

5-6

IM CW240E

5.3 Ranges and Number of Digits

● Active Power Range Configuration

Range Configurations 1 to 10 show the active power ranges corresponding to the voltage and current ranges. Each value in the table is its full scale value.

TIP

For reactive power or apparent power, the unit for the Range Configuration tables varies as follows:

• Reactive power (Var)

• Apparent power (VA)

If the VT ratio or CT ratio is set to any value other than "1":

A value obtained by multiplying a value in the Range Configuration tables by the VT or CT ratio applies.

If the result of "VT ratio ⫻ CT ratio ⫻ 1.3" exceeds 9999, the position of the decimal point is shifted by one digit.

Range Configuration 1 (Using clamp-on probe 96036)

96036

Voltage Range Wiring

1P2W 30.00 W 75.00 W 150.0 W 300.0 W

150.0 V

300.0 V

600.0 V

1.000 kV

1P3W 60.00 W 150.0 W 300.0 W 600.0 W

3P3W 60.00 W 150.0 W 300.0 W 600.0 W

3P4W 90.00 W 225.0 W 450.0 W 900.0 W

1P2W 60.00 W 150.0 W 300.0 W 600.0 W

1P3W 120.0 W 300.0 W 600.0 W 1.200 kW

3P3W 120.0 W 300.0 W 600.0 W 1.200 kW

3P4W 180.0 W 450.0 W 900.0 W 1.800 kW

1P2W 120.0 W 300.0 W 600.0 W 1.200 kW

1P3W 240.0 W 600.0 W 1.200 kW 2.400 kW

3P3W 240.0 W 600.0 W 1.200 kW 2.400 kW

3P4W 360.0 W 900.0 W 1.800 kW 3.600 kW

1P2W 200.0 W 500.0 W 1.000 kW 2.000 kW

1P3W 400.0 W 1.000 kW 2.000 kW 4.000 kW

3P3W 400.0 W 1.000 kW 2.000 kW 4.000 kW

3P4W 600.0 W 1.500 kW 3.000 kW 6.000 kW

200.0 mA 500.0 mA 1.000 A 2.000 A

Current Range

Setting Ranges Using the Direct Keys

IM CW240E

5-7

5.3 Ranges and Number of Digits

Range Configuration 2 (Using clamp-on probe 96033)

Voltage

Range

150.0 V

300.0 V

600.0 V

1.000 kV

Wiring

1P2W 750.0 W 1.500 kW 3.000 kW 7.500 kW

1P3W 1.500 kW 3.000 kW 6.000 kW 15.00 kW

3P3W 1.500 kW 3.000 kW 6.000 kW 15.00 kW

3P4W 2.250 kW 4.500 kW 9.000 kW 22.50 kW

1P2W 1.500 kW 3.000 kW 6.000 kW 15.00 kW

1P3W 3.000 kW 6.000 kW 12.00 kW 30.00 kW

3P3W 3.000 kW 6.000 kW 12.00 kW 30.00 kW

3P4W 4.500 kW 9.000 kW 18.00 kW 45.00 kW

1P2W 3.000 kW 6.000 kW 12.00 kW 30.00 kW

1P3W 6.000 kW 12.00 kW 24.00 kW 60.00 kW

3P3W 6.000 kW 12.00 kW 24.00 kW 60.00 kW

3P4W 9.000 kW 18.00 kW 36.00 kW 90.00 kW

1P2W 5.000 kW 10.00 kW 20.00 kW 50.00 kW

1P3W 10.00 kW 20.00 kW 40.00 kW 100.0 kW

3P3W 10.00 kW 20.00 kW 40.00 kW 100.0 kW

3P4W 15.00 kW 30.00 kW 60.00 kW 150.0 kW

Range Configuration 3 (Using clamp-on probe 96030)

Voltage

Range

150.0 V

300.0 V

600.0 V

1.000 kV

Wiring

1P2W 3.000 kW 7.500 kW 15.00 kW 30.00 kW

1P3W 6.000 kW 15.00 kW 30.00 kW 60.00 kW

3P3W 6.000 kW 15.00 kW 30.00 kW 60.00 kW

3P4W 9.000 kW 22.50 kW 45.00 kW 90.00 kW

1P2W 6.000 kW 15.00 kW 30.00 kW 60.00 kW

1P3W 12.00 kW 30.00 kW 60.00 kW 120.0 kW

3P3W 12.00 kW 30.00 kW 60.00 kW 120.0 kW

3P4W 18.00 kW 45.00 kW 90.00 kW 180.0 kW

1P2W 12.00 kW 30.00 kW 60.00 kW 120.0 kW

1P3W 24.00 kW 60.00 kW 120.0 kW 240.0 kW

3P3W 24.00 kW 60.00 kW 120.0 kW 240.0 kW

3P4W 36.00 kW 90.00 kW 180.0 kW 360.0 kW

1P2W 20.00 kW 50.00 kW 100.0 kW 200.0 kW

1P3W 40.00 kW 100.0 kW 200.0 kW 400.0 kW

3P3W 40.00 kW 100.0 kW 200.0 kW 400.0 kW

3P4W 60.00 kW 150.0 kW 300.0 kW 600.0 kW

96033

Current Range

5.000 A 10.00 A 20.00 A 50.00 A

96030

Current Range

20.00 A 50.00 A 100.0 A 200.0 A

5-8

IM CW240E

5.3 Ranges and Number of Digits

Range Configuration 4 (Using clamp-on probe 96031)

Voltage

Range

150.0 V

300.0 V

600.0 V

1.000 kV

Wiring

50.00 A 100.0 A 200.0 A 500.0 A

1P2W 7.500 kW 15.00 kW 30.00 kW 75.00 kW

1P3W 15.00 kW 30.00 kW 60.00 kW 150.0 kW

3P3W 15.00 kW 30.00 kW 60.00 kW 150.0 kW

3P4W 22.50 kW 45.00 kW 90.00 kW 225.0 kW

1P2W 15.00 kW 30.00 kW 60.00 kW 150.0 kW

1P3W 30.00 kW 60.00 kW 120.0 kW 300.0 kW

3P3W 30.00 kW 60.00 kW 120.0 kW 300.0 kW

3P4W 45.00 kW 90.00 kW 180.0 kW 450.0 kW

1P2W 30.00 kW 60.00 kW 120.0 kW 300.0 kW

1P3W 60.00 kW 120.0 kW 240.0 kW 600.0 kW

3P3W 60.00 kW 120.0 kW 240.0 kW 600.0 kW

3P4W 90.00 kW 180.0 kW 360.0 kW 900.0 kW

1P2W 50.00 kW 100.0 kW 200.0 kW 500.0 kW

1P3W 100.0 kW 200.0 kW 400.0 kW 1.000 MW

3P3W 100.0 kW 200.0 kW 400.0 kW 1.000 MW

3P4W 150.0 kW 300.0 kW 600.0 kW 1.500 MW

96031

Current Range

Range Configuration 5 (Using clamp-on probe 96032)

Voltage

Range

150.0 V

300.0 V

600.0 V

1.000 kV

Wiring

200.0 A 500.0 A 1.000 kA

1P2W 30.00 kW 75.00 kW 150.0 kW

1P3W 60.00 kW 150.0 kW 300.0 kW

3P3W 60.00 kW 150.0 kW 300.0 kW

3P4W 90.00 kW 225.0 kW 450.0 kW

1P2W 60.00 kW 150.0 kW 300.0 kW

1P3W 120.0 kW 300.0 kW 600.0 kW

3P3W 120.0 kW 300.0 kW 600.0 kW

3P4W 180.0 kW 450.0 kW 900.0 kW

1P2W 120.0 kW 300.0 kW 600.0 kW

1P3W 240.0 kW 600.0 kW 1.200 MW

3P3W 240.0 kW 600.0 kW 1.200 MW

3P4W 360.0 kW 900.0 kW 1.800 MW

1P2W 200.0 kW 500.0 kW 1.000 MW

1P3W 400.0 kW 1.000 MW 2.000 MW

3P3W 400.0 kW 1.000 MW 2.000 MW

3P4W 600.0 kW 1.500 MW 3.000 MW

96032

Current Range

Setting Ranges Using the Direct Keys

IM CW240E

5-9

5.3 Ranges and Number of Digits

Range Configuration 6 (Using clamp-on probe 96034)

Voltage

Range

150.0 V

300.0 V

600.0 V

1.000 kV

The model 96034 clamp-on probes allow a current range to be selected using a switch.

Model 96034_1 has a 3000 A range.

Wiring

1P2W 45.00 kW 112.5 kW 225.0 kW 450.0 kW

1P3W 90.00 kW 225.0 kW 450.0 kW 900.0 kW

3P3W 90.00 kW 225.0 kW 450.0 kW 900.0 kW

3P4W 135.0 kW 337.5 kW 675.0 kW 1.350 MW

1P2W 90.00 kW 225.0 kW 450.0 kW 900.0 kW

1P3W 180.0 kW 450.0 kW 900.0 kW 1.800 MW

3P3W 180.0 kW 450.0 kW 900.0 kW 1.800 MW

3P4W 270.0 kW 675.0 kW 1.350 MW 2.700 MW

1P2W 180.0 kW 450.0 kW 900.0 kW 1.800 MW

1P3W 360.0 kW 900.0 kW 1.800 MW 3.600 MW

3P3W 360.0 kW 900.0 kW 1.800 MW 3.600 MW

3P4W 540.0 kW 1.350 MW 2.700 MW 5.400 MW

1P2W 300.0 kW 750.0 kW 1.500 MW 3.000 MW

1P3W 600.0 kW 1.500 MW 3.000 MW 6.000 MW

3P3W 600.0 kW 1.500 MW 3.000 MW 6.000 MW

3P4W 900.0 kW 2.250 MW 4.500 MW 9.000 MW

Range Configuration 7 (Using clamp-on probe 96034)

Voltage

Range

150.0 V

300.0 V

600.0 V

1.000 kV

The model 96034 clamp-on probes allow a current range to be selected using a switch.

Model 96034_2 has a 2000 A range.

Wiring

1P2W 30.00 kW 75.00 kW 150.0 kW 300.0 kW

1P3W 60.00 kW 150.0 kW 300.0 kW 600.0 kW

3P3W 60.00 kW 150.0 kW 300.0 kW 600.0 kW

3P4W 90.00 kW 225.0 kW 450.0 kW 900.0 kW

1P2W 60.00 kW 150.0 kW 300.0 kW 600.0 kW

1P3W 120.0 kW 300.0 kW 600.0 kW 1.200 MW

3P3W 120.0 kW 300.0 kW 600.0 kW 1.200 MW

3P4W 180.0 kW 450.0 kW 900.0 kW 1.800 MW

1P2W 120.0 kW 300.0 kW 600.0 kW 1.200 MW

1P3W 240.0 kW 600.0 kW 1.200 MW 2.400 MW

3P3W 240.0 kW 600.0 kW 1.200 MW 2.400 MW

3P4W 360.0 kW 900.0 kW 1.800 MW 3.600 MW

1P2W 200.0 kW 500.0 kW 1.000 MW 2.000 MW

1P3W 400.0 kW 1.000 MW 2.000 MW 4.000 MW

3P3W 400.0 kW 1.000 MW 2.000 MW 4.000 MW

3P4W 600.0 kW 1.500 MW 3.000 MW 6.000 MW

96034_1

Current Range

300.0 A 750.0 A 1.500 kA 3.000 kA

96034_2

Current Range

200.0 A 500.0 A 1.000 kA 2.000 kA

5-10

IM CW240E

5.3 Ranges and Number of Digits

Range Configuration 8 (Using clamp-on probe 96034)

Voltage

Range

150.0 V

300.0 V

600.0 V

1.000 kV

The model 96034 clamp-on probes allow a current range to be selected using a switch.

Model 96034_3 has a 1000 A range.

Wiring

100.0 A 200.0 A 500.0 A 1.000 kA

1P2W 15.00 kW 30.00 kW 75.00 kW 150.0 kW

1P3W 30.00 kW 60.00 kW 150.0 kW 300.0 kW

3P3W 30.00 kW 60.00 kW 150.0 kW 300.0 kW

3P4W 45.00 kW 90.00 kW 225.0 kW 450.0 kW

1P2W 30.00 kW 60.00 kW 150.0 kW 300.0 kW

1P3W 60.00 kW 120.0 kW 300.0 kW 600.0 kW

3P3W 60.00 kW 120.0 kW 300.0 kW 600.0 kW

3P4W 90.00 kW 180.0 kW 450.0 kW 900.0 kW

1P2W 60.00 kW 120.0 kW 300.0 kW 600.0 kW

1P3W 120.0 kW 240.0 kW 600.0 kW 1.200 MW

3P3W 120.0 kW 240.0 kW 600.0 kW 1.200 MW

3P4W 180.0 kW 360.0 kW 900.0 kW 1.800 MW

1P2W 100.0 kW 200.0 kW 500.0 kW 1.000 MW

1P3W 200.0 kW 400.0 kW 1.000 MW 2.000 MW

3P3W 200.0 kW 400.0 kW 1.000 MW 2.000 MW

3P4W 300.0 kW 600.0 kW 1.500 MW 3.000 MW

96034_3

Current Range

Range Configuration 9 (Using clamp-on probe 96035)

Voltage

Range

150.0 V

300.0 V

600.0 V

1.000 kV

The model 96035 clamp-on probes allow a current range to be selected using a switch.

Model 96035_1 has a 3000 A range.

Wiring

300.0 A 750.0 A 1.500 kA 3.000 kA

1P2W 45.00 kW 112.5 kW 225.0 kW 450.0 kW

1P3W 90.00 kW 225.0 kW 450.0 kW 900.0 kW

3P3W 90.00 kW 225.0 kW 450.0 kW 900.0 kW

3P4W 135.0 kW 337.5 kW 675.0 kW 1.350 MW

1P2W 90.00 kW 225.0 kW 450.0 kW 900.0 kW

1P3W 180.0 kW 450.0 kW 900.0 kW 1.800 MW

3P3W 180.0 kW 450.0 kW 900.0 kW 1.800 MW

3P4W 270.0 kW 675.0 kW 1.350 MW 2.700 MW

1P2W 180.0 kW 450.0 kW 900.0 kW 1.800 MW

1P3W 360.0 kW 900.0 kW 1.800 MW 3.600 MW

3P3W 360.0 kW 900.0 kW 1.800 MW 3.600 MW

3P4W 540.0 kW 1.350 MW 2.700 MW 5.400 MW

1P2W 300.0 kW 750.0 kW 1.500 MW 3.000 MW

1P3W 600.0 kW 1.500 MW 3.000 MW 6.000 MW

3P3W 600.0 kW 1.500 MW 3.000 MW 6.000 MW

3P4W 900.0 kW 2.250 MW 4.500 MW 9.000 MW

96035_1

Current Range

Setting Ranges Using the Direct Keys

IM CW240E

5-11

5.3 Ranges and Number of Digits

Range Configuration 10 (Using clamp-on probe 96035)

Voltage

Range

150.0 V

300.0 V

600.0 V

1.000 kV

The model 96035 clamp-on probes allow a current range to be selected using a switch.

Model 96035_2 has a 3000 A range.

Wiring

1P2W 4.500 kW 11.25 kW 22.50 kW 45.00 kW

1P3W 9.000 kW 22.50 kW 45.00 kW 90.00 kW

3P3W 9.000 kW 22.50 kW 45.00 kW 90.00 kW

3P4W 13.50 kW 33.75 kW 67.50 kW 135.0 kW

1P2W 9.000 kW 22.50 kW 45.0 kW 90.00 kW

1P3W 18.00 kW 45.00 kW 90.0 kW 180.0 kW

3P3W 18.00 kW 45.00 kW 90.0 kW 180.0 kW

3P4W 27.00 kW 67.50 kW 135.0 kW 270.0 kW

1P2W 18.00 kW 45.00 kW 90.00 kW 180.0 kW

1P3W 36.00 kW 90.00 kW 180.0 kW 360.0 kW

3P3W 36.00 kW 90.00 kW 180.0 kW 360.0 kW

3P4W 54.00 kW 135.0 kW 270.0 kW 540.0 kW

1P2W 30.00 kW 75.00 kW 150.0 kW 300.0 kW

1P3W 60.00 kW 150.0 kW 300.0 kW 600.0 kW

3P3W 60.00 kW 150.0 kW 300.0 kW 600.0 kW

3P4W 90.00 kW 225.0 kW 450.0 kW 900.0 kW

● Display Digits

The display digits, position of the decimal point, and unit of measurement are as shown in the tables below. The maximum number of digits that can be displayed for voltage, current, power, frequency, power factor, and phase angle is 9999 (4 digits).

96035_2

Current Range

30.00 A 75.00 A 150.0 A 300.0 A

5-12

Voltage

Range ⫻ CT ratio (⫻ 1.3)*

1.95 to 9.999 V

10 to 99.99 V

100 to 999.9 V

1 to 9.999 kV

10 to 99.99 kV

100 to 999.9 kV

1 to 9.999 MV

Position of decimal point and unit

9.999 V

99.99 V

999.9 V

9.999 kV

99.99 kV

999.9 kV

9.999 MV

IM CW240E

5.3 Ranges and Number of Digits

Current

Range ⫻ CT ratio (⫻ 1.3)*

1.3 to 9.999 mA

10 to 99.99 mA

100 to 999.9 mA

1 to 9.999 A

10 to 99.99 A

100 to 999.9 A

1 to 9.999 kA

10 to 99.99 kA

100 to 999.9 kA

1 to 9.999 MA

10 to 99.99 MA

100 to 999.9 MA

Position of decimal point and unit

9.999 mA

99.99 mA

999.9 mA

9.999 A

99.99 A

999.9 A

9.999 kA

99.99 kA

999.9 kA

9.999 MA

99.99 MA

999.9 MA

Power

Rated power ⫻ VT ratio ⫻ CT ratio (⫻ 1.3)*

1.95 to 9.999 mW

10 to 99.99 mW

100 to 999.9 mW

1 to 9.999 W

10 to 99.99 W

100 to 999.9 W

1 to 9.999 kW

10 to 99.99 kW

100 to 999.9 kW

1 to 9.999 MW

10 to 99.99 MW

100 to 999.9 MW

1 to 9.999 GW

10 to 99.99 GW

100 to 999.9 GW

1 to 9.999 TW

10 to 99.99 TW

100 to 999.9 TW

* : If the VT ratio or CT ratio is any value other than “1” :

A vale obtained by multiplying a value in the table by the VT or CT ratio opplies.

Position of decimal point and unit

9.999 mW

99.99 mW

999.9 mW

9.999 W

99.99 W

999.9 W

9.999 kW

99.99 kW

999.9 kW

9.999 MW

99.99 MW

999.9 MW

9.999 GW

99.99 GW

999.9 GW

9.999 TW

99.99 TW

999.9 TW

Setting Ranges Using the Direct Keys

IM CW240E

5-13

5.3 Ranges and Number of Digits

Frequency

Input frequency

40 to 70 Hz 99.99 Hz

Power Factor

Measurement range

-1.000 to 0 to 1.000 1.000

Phase Angle

Measurement range

-180.0 to 180.0° 180.0

● Electric Energy (Position of Decimal Point and unit)

The position of the decimal point and the unit of measurement for electric energy can be set. This can be done by following GENERAL 2/2 of the SETUP screen.

Setting Item Description

Electric energy display [wh DISPLAY]

Unit of electric energy ELECTRIC ENERGY INDICATION UNIT

Interval electric energy display INTERVAL

Wh DISP.

Unit of interval electric energy INTERVAL ELECTRIC ENERGY INDICATION UNIT

Position of decimal point and unit

Position of decimal point

Position of decimal point and unit

Set the position of the decimal point and the unit of measurement for integrated electric energy.

For demand measurements: Set the position of the decimal

point and the unit of measurement for interval electric energy.

5-14

Contents of Settings

STANDARD

AUTO

Setting of decimal point

position

Setting of measurement

unit

The maximum number of displayable digits for electric energy is 999999 (6 digits).

Determines and fixes the position of the decimal point and the unit

of measurement automatically according to the rated power. (Table 1)

Shifts the position of the decimal point automatically (the unit of

measurement also changes). (Table 2)

000.000/0000.00/00000.0/000000

mWh/Wh/kWh/MWh/GWh

IM CW240E

5.3 Ranges and Number of Digits

STANDARD

When you select STANDARD, the position of the decimal point and the unit of measurement are as shown in the table below.

Table 1

Rated power ⫻ VT ratio ⫻ CT ratio

(⫻ interval time: h) *1

1.5 to 9.999 mW

10 to 99.99 mW

100 to 999.9 mW

1 to 9.999 W

10 to 99.99 W

100 to 999.9 W

1 to 9.999 kW

10 to 99.99 kW

100 to 999.9 kW

1 to 9.999 MW

10 to 99.99 MW

100 to 999.9 MW

1 to 9.999 GW

10 to 99.99 GW

100 to 999.9 GW

1 to 9.999 TW

10 to 99.99 TW

100 to 999.9 TW

*1: Interval electric energy in demand measurements is calculated by multiplying by interval time

(unit: h) in addition.

Position of decimal point and unit

0.0 to 9999.99 mWh

0.0 to 99999.9 mWh

0.000 to 999.999 mWh

0.00 to 9999.99 Wh

0.0 to 99999.9 Wh

0.000 to 999.999 Wh

0.00 to 9999.99 kWh

0.0 to 99999.9 kWh

0.000 to 999.999 kWh

0.00 to 9999.99 MWh

0.0 to 99999.9 MWh

0.000 to 999.999 MWh

0.00 to 9999.99 GWh

0.0 to 99999.9 GWh

0 to 999999 GWh

Setting Ranges Using the Direct Keys

TIP

If the measured value exceeds the maximum displayed value, the reading will be reset to zero, letting integration continue.

IM CW240E

5-15

5.3 Ranges and Number of Digits

AUTO

When AUTO is selected, the position of the decimal point and the unit of measurement change as follows:

The maximum number of digits that can be displayed for integrated electric energy is 999999 (6 digits). If electric energy is added to make it 1000000 (7 digits), the position of the decimal point will be moved automatically (the unit of measurement also changes automatically).

Example:

9.99999 mWh → 10.0000 mWh

99.9999 Wh → 100.000 Wh

999.999 mWh → 1.00000 Wh

999.999 Wh → 1.00000 kWh

The start value for integration has been specified as shown below according to the rated power value.

Table 2

Rated power ⫻ VT ratio ⫻ CT ratio

1.5 to 9.999 mW

10 to 99.99 mW

100 to 999.9 mW

1 to 9.999 W

10 to 99.99 W

100 to 999.9 W

1 to 9.999 kW

10 to 99.99 kW

100 to 999.9 kW

1 to 9.999 MW

10 to 99.99 MW

100 to 999.9 MW

1 to 9.999 GW

10 to 99.99 GW

100 to 999.9 GW

1 to 9.999 TW

10 to 99.99 TW

100 to 999.9 TW

Start value for integration of electric energy

0.00000 to mWh

0.0000 to mWh

0.000 to mWh

0.00000 to Wh

0.0000 to Wh

0.000 to Wh

0.00000 to kWh

0.0000 to kWh

0.000 to kWh

0.00000 to MWh

0.0000 to MWh

0.000 to MWh

0.00000 to GWh

0.0000 to GWh

0.000 to GWh

0.00 to GWh

0.0 to GWh

0 to GWh

TIP

If an integrated value exceeds the maximum displayable integrated value (999999 GWh), the reading will be reset to an integration start value (zero), letting integration continue.

5-16

IM CW240E

Chapter 6 Configuring Settings

6.1 Settings ..................................................... 6-2

6.2 General Settings 1/2.................................. 6-6

6.3 General Settings 2/2................................ 6-21

6.4 Save Data Settings 1/2 ............................ 6-46

6.5 Save Data Settings 2/2 ............................ 6-62

6.6 Communication Settings ........................ 6-67

6.7 Voltage Quality Settings ......................... 6-72

6.8 Hardware Settings .................................. 6-76

6.9 Analog I/O Settings ................................. 6-88

Yokogawa CW240 Operating Manual

Specifications and Main Features

Frequently Asked Questions

User Manual