Yokogawa CW240 Operating Manual

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

Toc-1

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

Toc-2

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

Toc-3

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

Toc-4

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

Toc-5

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)

All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation

IM CW240E

1

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.

2

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

3

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.

4

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

5

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.

ON

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.

6

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

7

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.

8

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

9

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.

10

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

11

Chapter 1 Product Overview

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.

1

Product Overview

IM CW240E

1-3

CLAMP-ON POWER METER

LIGHT

TOP

MENU

SAVE

A

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

PC

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

F

F

F1F

1

2

3

2

Part Names and How to Use Parts

F

F

4

5

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

F

5

F

1

to

LIGHT

RANGE

TOP

MENU

RANGE

A

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

F1

TOP

MENU

LIGHT

RANGE

RANGE

A

ENTER

ESC

SAVE

DISP COPY

SETUP screen FILE screen

2

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.

2

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; 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. Also, if the power
value exceeds the maximum displayable digits, 9999,
"----" 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

2

Part Names and How to Use Parts

IM CW240E

2-9