YOKOGAWA CW240 User manual

User's
Manual
CW240
Clamp-on Power Meter
IM CW240E
1st Edition: June 2004 (KP)
IM CW240E

Toc-1
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

Toc-2 IM CW240E
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
Index

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IM CW240E
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
Index

Toc-4 IM CW240E
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
Index

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IM CW240E
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
Index

1
IM CW240E
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 in-
depth 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.
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
Introduction
Disk No. CW240E
1st Edition: June, 2004 (KP)
All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation

2IM 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
Suffix Code
Power cord: UL/CSA standard
VDE standard
SAA standard
BS standard
D/A output and analog input
Clamp-on current probe for 96030, 2 pcs./set
Clamp-on current probe for 96030, 4 pcs./set
Clamp-on current probe for 96031, 2 pcs./set
Clamp-on current probe for 96031, 4 pcs./set
Clamp-on current probe for 96032, 2 pcs./set
Clamp-on current probe for 96032, 4 pcs./set
Clamp-on current probe for 96033, 2 pcs./set
Clamp-on current probe for 96033, 4 pcs./set
Clamp-on current probe for 96036, 2 pcs./set
Clamp-on current probe for 96036, 4 pcs./set
Clamp-on current probe for 96034, 2 pcs./set
Clamp-on current probe for 96034, 4 pcs./set
Clamp-on current probe for 96035, 2 pcs./set
Clamp-on current probe for 96035, 4 pcs./set
NiMH battery pack + carrying case
-D
-F
-R
-S
/DA
/C1
/C2
/C3
/C4
/C5
/C6
/C7
/C8
/C9
/C10
/C11
/C12
/C13
/C14
/PM1
Specifications
Option codes
No. field: denotes the product number.
Refer to this number when inquiring about the product to the vendor.

3
IM CW240E
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 788011 1set Yokogawa's AC adapter
power supply
2. AA-size alkaline - 6
batteries
3. Voltage probes 91007 4 Color: black, red, yellow, blue
4. User's Manual IM CW240 1
5. Quick Setup IM CW240P 1
Manual
6. CD-ROM 1
1. 2. 3.
4. 5. 6.
Checking the Contents of the Package

4IM CW240E
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
Selectable from 3000 A, 2000 A,
and 1000 A
for 3000 A 96035 1 Flexible type
Selectable from 3000 A and 300 A
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
TIP
It is advisable that the packing box be saved, as it is useful when you transport the
product.
Checking the Contents of the Package

5
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

6IM 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.
ON
This symbol indicates On (power).
OFF
This symbol indicates Off (power).
Double insulation
This symbol indicates double insulation.
WARNING
Indicates a hazard that may result in the loss of life or serious injury of the user
unless the described instruction is abided by.
CAUTION
Indicates a hazard that may result in an injury to the user and/or physical
damage to the product or other equipment unless the described instruction is
abided by.

7
IM CW240E
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.
WARNING
●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 atmo-
sphere.
●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.
Precautions for Safe Use of the Instrument

8IM CW240E
WARNING
●Use of Clamp-on Current Probes
•When using clamp-on current probes, keep the circuit voltage below oper-
ating 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 off power to the object under measurement that is
connected to the instrument’s input terminals. Never attempt to use the
instrument again. If any such anomalies as noted above occurs, contact
the vendor from which you purchased the instrument. Do not attempt to
repair the instrument yourself, as doing so is extremely dangerous.
Precautions for Safe Use of the Instrument

9
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 expli-
cation donnée par le manuel d'instruction afin d'éviter un accident au person-
nel 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.

10 IM CW240E
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 ten-
sion 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.
Utilisation en Toute Securite

11
IM CW240E
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 con-
tact fortuit entre celui-ci et une source de chaleur. Pour débrancher le cor-
don 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.
Utilisation en Toute Securite

Chapter 1 Product Overview
Chapter1 Product Overview
1.1 Product Overview ..................................... 1-2
1.2 System Configuration Diagram................ 1-4

1-2 IM CW240E
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 energy-
saving 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)
Each phase and total
• 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,
phase angle, power value, power content,
and power phase angle
Indication is available as a list, bar graph,
and vector diagram.
• Voltage fluctuation Voltage dip, swell, momentary interruption
(Voltage quality) Data is saved by a threshold value-based
trigger.
• Waveform Voltage and current waveform, full-voltage
waveform, full-current waveform
Features
●Supporting a Variety of Wiring Methods
• Wiring
Single-phase two-wire, single-phase three-wire, three-phase three-wire two-
current, 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.
Chapter 1 Product Overview

1-3
IM CW240E
Product Overview
1
●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
Powerquality 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.
1.1 Product Overview