YOKOGAWA CW120 User Manual
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YOKOGAWA CW120 User Manual

YOKOGAWA CW120 User Manual

Clamp-on power meters
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User's
Manual
IM CW120-E
Before Use
Before starting measurement with your CW120 or CW121, fill in the Setting Check Sheet in the
back of the Operation Guide (IM CW120P-E) with your particular settings, to facilitate setting on
site.
CW120/121
CLAMP-ON POWER METERS
IM CW120-E
First Edition: Dec. 2001 (YG)

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Summary of Contents for YOKOGAWA CW120

  • Page 1 CLAMP-ON POWER METERS Manual IM CW120-E Before Use Before starting measurement with your CW120 or CW121, fill in the Setting Check Sheet in the back of the Operation Guide (IM CW120P-E) with your particular settings, to facilitate setting on site. IM CW120-E...

  • Page 3: Introduction

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

  • Page 4: Checking Items In The Package

    (One of the four options) B9988TB -F: VDE standard B9988YC -R: SAA standard B9988YD -S: BS standerd 2. Voltage probes (for CW120) 91018 Color: Black, red, yellow Voltage probes (for CW121) 91007 Color: Black, red, yellow, blue 3. User’s Manual IM CW120-E 4.
  • Page 5 The products listed below are available as optional peripherals. For technical and ordering inquiries concerning the peripherals, contact the vendor from which you purchased the instrument. If you purchased any one of the optional peripherals together with the CW120/121, make sure it is free from any damage. Product Name...
  • Page 6 Checking Items in the Package Housing CW120/121 and Accessories The optional carrying case can accommodate the CW120 or CW121 main unit with its current-sensing clamp-on probes and voltage probes connected to the unit. The case can also hold such accessories as manuals and PC cards, and so is useful for transporting a complete set of tools necessary for measurement.

  • Page 7: Precautions For Safe Use Of The Instrument

    If you use the instrument in any other way than instructed in this manual, the instrument’s protective measures may be impaired. Yokogawa M&C Corporation is by no means liable for any damage resulting from use of the instrument in contradiction to these cautionary notes.
  • Page 8 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.

  • Page 9: Table Of Contents

    Setting Name of Measured-data File ............7-32 Chapter 8. Instantaneous Value Measurement ..........8-1 Measuring Instantaneous Values ..............8-1 Switching Display Contents ................. 8-2 Saving Data ....................8-4 Frequency Measurement ................8-7 Sampling Cycle and Integration Cycle ............8-8 IM CW120-E...
  • Page 10 Corrective Measures in Case of Failure ............ 13-1 13.2 Error Codes ....................13-2 Chapter 14. Specifications ................. 14-1 14.1 Specifications of CW120/121 ..............14-1 14.2 Specifications of Clamp-on Current Probes ..........14-8 Appendix 1. Circuit Block Diagram .............. App1-1 Appendix 2. Communication Commands ............ App2-1 1.
  • Page 11 2. Measured Data ................... App3-3 File Format .................... App3-3 Print Format ................... App3-5 3. Settings ....................App3-6 File Format .................... App3-6 Output Format and Data Values ............App3-7 Print Format ................... App3-9 4. Automatic File Naming ..............App3-10 Index ....................... Index-1 IM CW120-E...

  • Page 13: Chapter 1. Product Overview

    CW121: Supports single-phase two-wire, single-phase three-wire, three- • phase three-wire, and three-phase four-wire circuits. The following explains the features of the CW120/121, shows a schematic diagram of their functions, and describes the contents displayed on the screen in each measurement mode.
  • Page 14 1.1 Product Overview Compact Design The CW120/121 are sufficiently compact to be installed inside a cubicle or • power distribution panel during measurement. • The 96033 current-sensing probe with a 5 to 50 A range is designed for use in a narrow space, so is useful for measurement inside a power distribution panel with dense wiring.
  • Page 15 Unit Displayed Name Rms voltage V1, V2, V3 (differs depending on the wiring method) Rms current A1, A2, A3 (differs depending on the wiring method) Active power Reactive power Power factor — Frequency Hz (input frequency of V1) IM CW120-E...
  • Page 16 Screen Screen Screen Screen Screen Screen Position Upper row Single-phase two wires (1∅2W) Lower row TIME Upper row Single-phase three wires (1∅3W) Lower row TIME Three-phase three wires (3∅3W) Upper row Three-phase four wires (3∅4W) Lower row TIME IM CW120-E...

  • Page 17: Chapter 2. Components And Indications

    Chapter 2. Components and Indications 2.1 Front Panel and Connector Block Dimensions Connector Block Unit: mm Front View Side View IM CW120-E...
  • Page 18 2.1 Front Panel and Connector Block Connector Block Voltage input terminals Current input terminals CW120: Supports from single-phase two-wire to three-phase three-wire circuits Voltage input terminals: N, V1, V2 Current input terminals: CH1, CH2 CW121: Supports from single-phase two-wire to three-phase four-wire circuits...

  • Page 19: Connecting Input Signals

    WARNING • Thoroughly read Section 5.1, “Precautions for Wiring the Circuit under Test.” • When connecting the CW120/121, turn off the circuit under test. It is extremely dangerous to connect or disconnect probes to/from a live circuit. • Be extremely careful not to connect any voltage-mode circuit to the current input terminals or any current-mode circuit to the voltage input terminals.
  • Page 20 • Probes for terminals V1 to V3: Probes with a red, yellow, or blue alligator plug Accompanying probes CW120: Three (black, red, and yellow) CW121: Four (black, red, yellow, and blue) Differentiating between Clamp-on Current Probes Use accompanying ring markers (of four different colors) to differentiate clamp-on current probes for correct connections.

  • Page 21: Operation Keys And Display

    In measurement screen: Switches the display contents. (UP/DOWN/LEFT/RIGHT keys) In setting screen: Changes the selection or number, or moves the cursor position (flashing digit) over digits. Integration status LED indicator: Lit when the integration is carried out, and flashes when it is on stand-by. IM CW120-E...

  • Page 22: Overrange And Other Marks Shown During Measurement

    WARNING When the overrange mark appears with the range set to a maximum, it means that the input exceeds the maximum allowable level of the CW120/121. Do not apply an input level higher than the maximum allowable input level. CAUTION When measuring an input signal level exceeding the rated range, use a voltage transformer (VT) or current transformer (CT).
  • Page 23 Frequency ≤40 Hz or ≥70 Hz ---- Hz Even when an instantaneous value is displayed as , the integration calculation is carried out continu- ously. The accuracy of the electric energy value, however, is undefined in this case. IM CW120-E...
  • Page 24 Lights when the VT ratio is set at a value other than 1. Lights when the CT ratio is set at a value other than 1. Indications for current settings of voltage range, current range, and wiring method: Wiring method Voltage range Current range IM CW120-E...
  • Page 25 PC card is enabled but the filename is not specified. Appears when integration begins in the case that data saving to a PC card is enabled and the filename is specified. The digits following “FILE” indicate “defined.” IM CW120-E...

  • Page 27: Chapter 3. Precautions For Safe Measurement

    Do not use chemicals such as benzine or paint thinner. Otherwise, the instrument may be discolored or deformed. Display Screen When the instrument is shipped from the factory, the display screen is covered with a protective film. Remove the film before you begin using the instrument. IM CW120-E...
  • Page 28 CT. • If dust or any other foreign matter gets in the clamping CT, do not shut the clamping cores tight. First remove the dust and then make sure the clamping cores on both sides close smoothly. IM CW120-E...

  • Page 29: Installation Procedure

    The CW120/121 meet the “Pollution degree 2”. CAUTION • When using or installing two or more CW120/121 power meters, leave a distance of at least 10 mm (0.4") between them. • When putting a power meter inside a power distribution panel or the like, leave a space of at least 10 mm (0.4") from a wall and ensure that excess pressure may not be applied to the...
  • Page 30 3.2 Installation Procedure Level Location Do not install the CW120/121 in an unstable or inclined location; inaccurate measurements may result. Other Conditions Do not install the CW120/121 in a location that is: • exposed to direct sunlight or close to a heat source;...

  • Page 31: Maintaining High Precision Of Measurement

    30% or less, use such equipment as an anti-static mat to prevent electrostatic discharge. If you move the CW120/121 from an area of low temperature and humidity to an area of high temperature and humidity or if there is a sudden change in the ambient temperature, condensation may occur in the meter.

  • Page 33: Chapter 4. Connecting Power Supply And Turning Power On/Off

    • Before connecting the power cord, make sure the power-source voltage matches the rated supply voltage. • Before connecting the power cord, also make sure the power switch of the CW120 or CW121 is turned off. • If the CW120 or CW121 will not be used for a prolonged period, disconnect the power cord from the outlet.
  • Page 34 • When plugging and unplugging the power cord into/from the CW120 or CW121, ensure that the PC card eject button is depressed. • The CW120 or CW121 will not work if the fuse built into the power supply circuit of the CW120 or CW121 has blown.

  • Page 35: When Supplying Power From Voltage Input

    • Before connecting to the circuit to be measured, make sure the power to the circuit is turned off. • Before connecting the power cable, make sure the power switch of the CW120 or CW121 is turned off. • Do not place any load on the power cord or allow the power cord to come into accidental contact with a heat source.

  • Page 36: Startup Screens

    4.3 Startup Screens When you turn on the power to the CW120 or CW121, the screens shown in (1) to (3) below appear sequentially in order. (1) All-segment On All segments light for approximately 2 seconds, then the screen changes to the model and version display.
  • Page 37 • The backup battery cannot be replaced by the user. For replacement, contact the vendor from which you purchased the instrument. • The backup battery life is about 10 years. SEE ALSO For details of errors and the countermeasures, see Chapter 13, “Troubleshooting.” IM CW120-E...

  • Page 38: Basic Operation Flow

    4.4 Basic Operation Flow Connect power supply Chapter 4 to CW120/121 Turn on power to Chapter 4 CW120/121 Startup screens Chapter 4 Measurement screen When no setting is needed Setting screen Chapter 7 Measurement screen : Calls up wiring setting...

  • Page 39: Chapter 5. Wiring

    Test WARNING • When wiring the CW120 or CW121, or when it is turned off, turn off the circuit under test. It is highly dangerous to connect or disconnect voltage or clamp-on current probes without first turning off the circuit under test.

  • Page 40: Diagrams Of Basic Wiring

    Single-phase three wires (1∅ ∅ ∅ ∅ ∅ 3W) SOURCE LOAD Three-phase three wires (3∅ ∅ ∅ ∅ ∅ 3W) SOURCE LOAD Three-phase four wires (3∅ ∅ ∅ ∅ ∅ 4W): Only for CW121 SOURCE LOAD V2 V3 IM CW120-E...
  • Page 41 Three-phase three wires Terminals: N-V1, N-V2 Terminals: CH1, CH2 (3∅3W) Units: V1, V2 Units: A1, A2 Three-phase four wires* Terminals: N-V1, N-V2, N-V3 Terminals: CH1, CH2, CH3 (3∅4W) Units: V1, V2, V3 Units: A1, A2, A3 * Only for CW121 IM CW120-E...

  • Page 42: Wiring The Circuit Under Test With External Vt/Ct

    If the maximum voltage or current level being measured exceeds the maximum measurement range of the CW120/121, use an external voltage transformer (VT) or current transformer (CT). This strategy enables the voltage or current levels beyond the maximum range to be measured.

  • Page 43: Indication And Change Of Wiring Method

    The abbreviations for wiring methods are labeled immediately above the screen as 1∅2W, 1∅3W, 3∅3W, and 3∅4W (3∅4W is not included for the CW120), and the sign on the screen indicates the wiring method currently selected in the CW120/121. Wiring methods WIRING WIRING key To change the wiring method, press the key.

  • Page 44: Wiring Check Function

    1. Existence of input voltages 1. Existence of input currents 2. Frequency detection 2. Clamp directions 3. Voltage phase sequence NOTE • Measurement is not performed during the wiring check. • The wiring check cannot be carried out during continuous measurement. IM CW120-E...
  • Page 45 • As the wiring is judged on the above criteria, an error may result even when wiring is correct or wrong wiring may pass the check. • When a measured value appears to be abnormal, check the above criteria and wiring again. IM CW120-E...
  • Page 46 ” is displayed on both the upper and lower rows. Press the key to return to the measurement screen. When no error Upper: Judgment of current inputs Lower: Judgment of voltage inputs WIRING WIRING key START &STOP START&STOP key IM CW120-E...
  • Page 47 To return to the measurement screen, press the key. Example of error indications Upper: No current input Lower: Voltage phase sequence error when frequency error) WIRING WIRING key START &STOP START&STOP key IM CW120-E...

  • Page 49: Chapter 6. Setting Ranges And Wiring Method

    Wiring Method (Phase Lines) Power Range Single-phase two wires Voltage range × current range Single-phase three wires Voltage range × current range × 2 Three-phase three wires Three-phase four wires Voltage range × current range × 3 (only for CW121) IM CW120-E...
  • Page 50 If either or both of the VT and CT ratios are set to a value other than 1, and if the product of the following formula exceeds 9999, the decimal point is incremented by one: Rated power in table × VT ratio × CT ratio × 1.3 IM CW120-E...
  • Page 51 9.999 9.999 to 99.99 99.99 to 999.9 999.9 to 9.999 9.999 to 99.99 99.99 to 999.9 999.9 1000 to 9999 9999 * Multiply by 1.3 only when the CT or VT ratio is a value other than 1. IM CW120-E...
  • Page 52 000000 • Unit: Selectable from Wh, kWh, MWh, and GWh By selecting STANDARD, you can also let the CW120/121 automatically set them as follows. Rated Power × VT Ratio × CT Ratio Decimal Point Position and Unit for Electric energy (×...
  • Page 53 Otherwise, the electric energy count will be added to the previous value. For details of how to clear the electric energy count, see Section 9.2.3, “Clearing Electric Energy Count,” or Section 7.2.4, “Clearing Electric Energy Count and Resetting System,” in Chapter 7, “Making Settings.” IM CW120-E...

  • Page 54: Changing Voltage Range Setting

    Clear the electric energy count first. For details of how to do this, see Section 9.2.3, “Clearing Electric Energy Count,” or Section 7.2.4, “Clearing Electric Energy Count and Resetting System,” in Chapter 7, “Making Settings.” IM CW120-E...

  • Page 55: Changing Current Range Setting

    Clear the electric energy count first. For details of how to do this, see Section 9.2.3, “Clearing Electric Energy Count,” or Section 7.2.4, “Clearing Electric Energy Count and Resetting System,” in Chapter 7, “Making Settings.” IM CW120-E...
  • Page 56 (2) Using the keys, make the mark (in the lower right) and its current setting appear on the screen. Then, press the key. The number representing the currently selected clamp model flashes. IM CW120-E...
  • Page 57 Clear the electric energy count first. For details of how to do this, see Section 9.2.3, “Clearing Electric Energy Count,” or Section 7.2.4, “Clearing Electric Energy Count and Resetting System,” in Chapter 7, “Making Settings.” IM CW120-E...

  • Page 58: Changing Wiring Method Setting

    WIRING WIRING key Each press of the key changes the wiring method selection sequentially as follows: For CW120 1∅2W 1∅3W 3∅3W Default: 3∅3W • If a change to the wiring method setting is incompatible with the conditions derived from other set- tings, the change is ineffective.
  • Page 59 6.4 Changing Wiring Method Setting For CW121 1∅2W 1∅3W 3∅3W 3∅4W Default: 3∅3W SEE ALSO For details of the wiring methods, see Chapter 5, “Wiring.” 6-11 IM CW120-E...

  • Page 61: Chapter 7. Making Settings

    16.Decimal point position and unit selections for electric energy The Setting Check Sheet in the back of Operation Guide (IM CW120P-E) lists necessary settings and their available selections. Use this sheet for grasping the setting conditions and for efficient setting on site. IM CW120-E...
  • Page 62 Used to cancel a setting. Pressing this key returns to the preceding screen. keys Used to: • Change the setting item displayed. • Change a number. • Change a setting. keys Used to: • Change the setting item displayed. • Select a digit. • Change a setting. IM CW120-E...
  • Page 63 • The MEM (backup memory setting) is skipped if no data exists in the backup memory (and the MEM mark is not lit on the measurement screen). • The DEV (communication device) setting is skipped if your CW120/121 model has an RS-485 inter- face.

  • Page 64: Setting Each Item

    7.2.1 Setting Device Number ( Description The device number is used for identifying each power meter (CW120/121) when monitoring a specific power with two or more CW120s and CW121s, and also used as the device address when using RS-485 communication.
  • Page 65 A three-digit number appears on the lower row, allowing you to set the file number of the file to/ from which you want to save/load settings. To cancel loading/saving, press the key. The setting item selection screen returns. IM CW120-E...
  • Page 66 You cannot select the file number of a file that does not exist. Selecting such a file number returns to the screen for file number setting. To cancel loading, press the key. The screen in step (1) returns. IM CW120-E...
  • Page 67 • When the PC card is full, the sign is displayed on the screen and the saving cannot be per- formed. • Saving the settings when the communication device is set to a printer, prints the settings at the same time. IM CW120-E...
  • Page 68 PC card. (3) Press the key. The selected action takes place and the setting item selection screen returns. To cancel the data deletion or formatting, press the key. The setting item selection screen also returns. IM CW120-E...
  • Page 69 The setting item selection screen also returns. NOTE The electric energy count can also be cleared by simply pressing the key for three seconds or more in the measurement screen. For this, see Section 9.2.3, “Clearing Electric Energy Count.” IM CW120-E...
  • Page 70 7.2.5 Copying and Clearing Backup Memory Contents ( Description The CW120/121 have a memory for backing up the PC card. When the PC card becomes full or is removed, data is saved to the backup memory. For details, see Section 9.5, “Backup Memory.”...
  • Page 71 7.2 Setting Each Item 7.2.6 Changing Date and Time ( Description The CW120/121 have a clock, which is adjusted to the Japan standard time by default (factory setting). To change the date and time, follow the procedure below. Procedure (1) Using the keys in the setting item selection screen, make the mark and the current data and time settings appear on the screen.
  • Page 72 Then, press the key. The current setting flashes. Output Interval Setting Screen Interval MEAS/SET key UP/DOWN/LEFT/RIGHT keys MEAS/SET DISP ENTER ENTER key ESC key 7-12 IM CW120-E...
  • Page 73 Do not remove the PC card during electric energy measurement. Do not activate communication. Do not perform excessive key actions. Only if data saving to the PC card is enabled (see Section 7.2.10), data is saved to the PC card at the specified interval. 7-13 IM CW120-E...
  • Page 74 — you want to change where the year, month, and day are shown with superscripts y, m, and d to avoid confusion. The selected item flashes. (3) Using the keys, change the value of the selected item. When changing a number, pressing the key continuously will make quick changes. 7-14 IM CW120-E...
  • Page 75 For the year, set the last two digits. The range of the year setting is 00 to 99 (years 2000 to 2099). SEE ALSO For details of the start and stop of integration, see Section 9.2, “Starting and Stopping Integration.” 7-15 IM CW120-E...
  • Page 76 (4) After making all necessary changes, press the key. The stop date and time settings are changed and the setting item selection screen returns. To cancel the changes, press the key. The setting item selection screen also returns. 7-16 IM CW120-E...
  • Page 77 For the year, set the last two digits. The range of the year setting is 00 to 99 (years 2000 to 2099). SEE ALSO For details of the start and stop of integration, see Section 9.2, “Starting and Stopping Integration.” 7-17 IM CW120-E...
  • Page 78 • When the saving is enabled (on), data is saved to the PC card in the output interval set (in Section 7.2 7). • When the saving is enabled (on), the mark is displayed also in the measurement screen. 7-18 IM CW120-E...
  • Page 79 SEE ALSO For the computer connection, see Chapter 11, “Communication Functions.” For the printer connection, see Section 12.2, “Using Optional Printer.” 7-19 IM CW120-E...
  • Page 80 The baud rate setting flashes. Communication Setting Screen Baud rate Data bits-parity-stop bits MEAS/SET key UP/DOWN/LEFT/RIGHT keys MEAS/SET DISP ENTER ENTER key ESC key (2) If necessary, change the baud rate using the keys. The baud rate changes sequentially as follows. 7-20 IM CW120-E...
  • Page 81 • You can move between the baud rate, data bit, parity bit, and stop bit settings from one to another in the reverse direction by using the key. • Resetting the system using a command via communication leaves the baud rate, data bit, parity bit, and stop bit settings unchanged. 7-21 IM CW120-E...
  • Page 82 Description When installing an external voltage transformer (VT) and inputting the secondary-circuit output of the VT to the CW120/121, setting the VT ratio appropriately will display the reading correctly in the scale of the primary circuit, namely, will perform scaling.
  • Page 83 When using a 2200-to-110 V transformer, the transformer ratio is 20:1. So, set the VT ratio to 20. Displayed values: Range of voltage reading: Voltage range × VT ratio Range of current reading: Current range × CT ratio Range of power reading: Rated power × VT ratio × CT ratio 7-23 IM CW120-E...
  • Page 84 Description When installing an external current transformer (CT) and inputting the secondary-circuit output of the CT to the CW120/121, setting the CT ratio appropriately will display the reading correctly in the scale of the primary circuit, namely, will perform scaling.
  • Page 85 When using a 100-to-5 A transformer, the transformer ratio is 20:1. So, set the CT ratio to 20. Displayed values: Range of voltage reading: Voltage range × VT ratio Range of current reading: Current range × CT ratio Range of power reading: Rated power × VT ratio × CT ratio 7-25 IM CW120-E...
  • Page 86 7.2 Setting Each Item 7.2.15 Selecting Clamp-on Current Probe to Be Used ( ) Description The following four models of clamp-on current probes can be connected to the CW120/121. Selectable Clamp-on Current Probes Clamp-on Current Probe Model Setting Rating (Ranges)
  • Page 87 A maximum of three clamp-on current probes may be connected though it varies with the wiring method; probes having different ratings cannot be used at the same time. Namely, the clamp-on probes used at the same time must be of the same model. 7-27 IM CW120-E...
  • Page 88 Select (default) when using the standard settings. Selecting the standard setting lets the CW120/121 power meter determine the decimal point position and unit based on the product of [rated power × VT ratio × CT ratio × 1.3] as follows.
  • Page 89 ESC key (1) Using the keys, select (2) Then, press the key. The settings are changed accordingly and the setting item selection screen returns. To cancel the change, press the key. The setting item selection screen also returns. 7-29 IM CW120-E...
  • Page 90 The setting is changed accordingly and the unit setting begins flashing. To cancel the change, press the key. The setting item selection screen also returns. The decimal point moves sequentially by the keys as shown below. 7-30 IM CW120-E...
  • Page 91 (2) Using the keys, change the unit. (3) Then, press the key. The setting is changed accordingly and the setting item selection screen returns. To cancel the change, press the key. The setting item selection screen also returns. 7-31 IM CW120-E...

  • Page 92: Setting Name Of Measured-Data File

    • To reset the file name setting, reset the system or set the file name to ””. • If the file name is not set, it will be assigned automatically. SEE ALSO For details of communication, see Chapter 11, “Communication Functions” and Chapter 12, “Communi- cation Commands.” 7-32 IM CW120-E...

  • Page 93: Chapter 8. Instantaneous Value Measurement

    Chapter 8. Instantaneous Value Measurement 8.1 Measuring Instantaneous Values The CW120/121 power meters have two modes for measurement: 1. Instantaneous value measurement: Measures the rms voltages and rms current of individual phases, and power, reactive power, power factor, and frequency.

  • Page 94: Switching Display Contents

    Sequence of Display Contents Switching for Single-phase Two Wires Measurement Screen Using UP/DOWN/LEFT/RIGHT keys Upper: Rms voltage Lower: Rms current Measurement Screen Upper: Active power Lower: Reactive power Measurement Screen Upper: Power factor Lower: Frequency Measurement Screen Upper: Electric energy Lower: Elapsed time of integration IM CW120-E...
  • Page 95 TIME: Elapsed time of integration 3∅4W 1∅3W or 3∅3W 1∅2W Screen 1 Screen 2 Screen 3 Screen 4 Screen 5 Screen 6 The active electric energy and elapsed time of integration are displayed also during instantaneous value measurement. IM CW120-E...

  • Page 96: Saving Data

    File Number Display upon Manual Saving Saving-to-PC-card mark Data record number File number SAVE key SAVE (2) Pressing the key again saves the measured values again with the data record number incremented but with the file number unchanged. IM CW120-E...
  • Page 97 File Type Measure Mode OUTPUT OUTPUT INTEG START INTEG START ELAPSED V1 I1 Q PF F Wh(+) Wh(–) DATE TIME DATE TIME TIME 2001/11/11 10:10:00 0000/00/00 0:00:00 0:00:00 2001/11/11 10:15:00 0000/00/00 0:00:00 0:00:00 2001/11/11 10:21:00 0000/00/00 0:00:00 0:00:00 IM CW120-E...
  • Page 98 Frequency (value appearing with “Hz” on meter screen) Wh(+): Active electric energy (value appearing with “Wh” on meter screen) Wh(–): Regenerative energy (not appearing on meter screen) SEE ALSO For details, see Appendix 3, “File Structures and Data Items Printed.” IM CW120-E...

  • Page 99: Frequency Measurement

    Range of frequency measured: 45 to 65 Hz Provision of Lowpass Filter A lowpass filter with the cutoff frequency of 300 Hz is built into the frequency measurement circuit for eliminating noise from the input signal and assuring accurate frequency measurement. IM CW120-E...

  • Page 100: Sampling Cycle And Integration Cycle

    Sampling frequency: Approx. 10 kHz Integration cycle: 120 ms Frequency measurement input V1 50 Hz (sine wave) 20 ms Zero-crossing signal 100 ms Examples Frequency (Hz) Integration Cycle (ms) Number of Waves 116.67 IM CW120-E...

  • Page 101: Chapter 9. Electric Energy Measurement

    Chapter 9. Electric Energy Measurement 9.1 Measuring Electric Energy The CW120/121 power meters have two modes for measurement: 1. Instantaneous value measurement: Measures the rms voltages and rms current of individual phases, and power, reactive power, power factor, and frequency.
  • Page 102 9.1 Measuring Electric Energy Measurement Procedure 1. Perform safety checks with reference to Chapter 3, “Precautions for Safe Measurement.” 2. Turn on the power to CW120/121 with reference to Chapter 4, “Connecting Power Supply and Turning Power On/Off.” 3. Perform wiring with reference to Chapter 5, “Wiring.”...

  • Page 103: Starting And Stopping Integration

    If data saving to the PC card is enabled (see Section 7.2.10), the file number of the file to which the data is to be saved is displayed at the same time. After two seconds, the file number display disappears and the measurement screen returns. IM CW120-E...
  • Page 104 (only if data saving to the PC card is enabled [see Section 7.2.10]), then the file number display disappears and appears, indicating that the power meter has entered the integration standby state. IM CW120-E...
  • Page 105 When the specified time on the specified date has been reached, integration begins. mark flashes. mark lights. LED flashes. LED lights. Integration in Integration standby progress LED status indicator Integration start End of integration date and time set IM CW120-E...
  • Page 106 Integration will begin at an appropriate time determined from the output interval set. mark flashes. mark lights. LED flashes. LED lights. Integration in Integration standby progress Integration start LED status indicator date and time set Start of integration End of (determined from output interval set) integration IM CW120-E...
  • Page 107 To abort integration before the set stop date and time have been reached, also press the key for one second or more. mark lights. mark disappears. LED lights. LED extinguishes. Integration in progress LED status indicator Integration stop date and time set Press for one second or more to abort IM CW120-E...
  • Page 108 • If the integration starts at a time after (in the future) the set stop date and time, the stop date and time settings become ineffective. You need to stop integration manually in this case, too. • As the stop date and time, you cannot set a time earlier than (in the past) the start date and time. IM CW120-E...
  • Page 109 Electric Energy Count Clearance Screen ENTER RESET ENTER key ESC (escape) key (2) Press the key. The electric energy count is cleared and the measurement screen returns. To cancel, press the key. The measurement screen also returns. IM CW120-E...

  • Page 110: Switching Display Contents

    Sequence of Display Contents Switching for Single-phase Two Wires Measurement Screen Using UP/DOWN/LEFT/RIGHT keys Upper: Rms voltage Lower: Rms current Measurement Screen Upper: Active power Lower: Reactive power Measurement Screen Upper: Power factor Lower: Frequency Measurement Screen Upper: Electric energy Lower: Elapsed time of integration 9-10 IM CW120-E...
  • Page 111 Reactive power (with minus sign in case of negative value) Power factor (with minus sign in case of negative value) Frequency Active electric energy TIME: Elapsed time of integration 3∅4W 1∅3W or 3∅3W 1∅2W Screen 1 Screen 2 Screen 3 Screen 4 Screen 5 Screen 6 9-11 IM CW120-E...

  • Page 112: Saving Data

    • When the PC card becomes full, the mark appears and data will be saved to the backup memory. For details, see Section 7.2.5, “Copying and Clearing Backup Memory Contents,” and Section 9.5, “Backup Memory.” 9-12 IM CW120-E...
  • Page 113 Display When File Name Is Given Automatically Integration mark Saving-to-PC-card mark File number Display When File Name Is Specified Integration mark Saving-to-PC-card mark SEE ALSO For details, see Section 7.3, “Setting Name of Measured-data File.” 9-13 IM CW120-E...
  • Page 114 Frequency (value appearing with “Hz” on meter screen) Wh(+): Active electric energy (value appearing with “Wh” on meter screen) Wh(–): Regenerative energy (not appearing on meter screen) SEE ALSO For details, see Appendix 3, “File Structures and Data Items Printed.” 9-14 IM CW120-E...

  • Page 115: Backup Memory

    9.5 Backup Memory The CW120/121 have a built-in memory for backing up the PC card and can be used for saving data up to 3000 times. Data is saved to the backup memory in the following cases: • When the PC card becomes full (the mark appears).
  • Page 116 ENTER key SEE ALSO Section 7.2.5, “Copying and Clearing Backup Memory Contents” NOTE If a file having the same file name resides in the PC card, the data is copied (added) to the bottom of that file. 9-16 IM CW120-E...
  • Page 117 Screen for Clearing Data MEAS/SET key UP/DOWN/LEFT/RIGHT keys MEAS/SET DISP ENTER ENTER key SEE ALSO Section 7.2.5, “Copying and Clearing Backup Memory Contents” NOTE Starting the next integration will also clear the data in the backup memory. 9-17 IM CW120-E...

  • Page 118: External Control Input/Output

    +5 V 4.7 kΩ 100 Ω 100 pF • Output Circuit • Example of Input Signal Changes Min. 30 sec 5 V (open) 100 Ω 0 V (closed) Start Start Stop Stop Integration in progress (continuous measurement) 9-18 IM CW120-E...
  • Page 119 Connecting a Control Signal in Parallel to Control All Meters Synchronously Meter No. 1 Meter No. 2 Meter No. 3 Control signal Controlling Meter Nos. 2 and 3 by Control Signal of Meter No. 1 Meter No. 1 Meter No. 2 Meter No. 3 9-19 IM CW120-E...
  • Page 120 Solid AWG 26 to AWG 18 (0.4 to 1.0 mm diameter) wires Stranded AWG 22 to AWG 20 (0.3 to 0.75 mm diameter) wires with each strand thicker than 0.18 mm diameter Standard peeling length: 10 mm 9-20 IM CW120-E...

  • Page 121: Meter Actions Upon Power Failure And Recovery

    After the power restoration, the date and time of the restoration are saved, is displayed, and integration restarts in the same conditions as before the power failure. Pressing any key returns to the measurement screen. Power Restoration Display 9-21 IM CW120-E...
  • Page 122 POWER ON 2001/12/01 09:18:00 POWER OFF: “2001/12/01” and “09:15:00” indicates that a power failure occurred at 09:15:00 on December 1, 2001. POWER ON: “2001/12/01” and “09:18:00” indicates that the power was restored at 09:18:00 on December 1, 2001. 9-22 IM CW120-E...

  • Page 123: Chapter 10. Pc Card

    Chapter 10. PC Card 10.1 PC Card Specifications The CW120/121 can save measured data and settings to a PC card as well as read saved settings from a PC card to apply them. The PC card interface of the CW120/121 complies with the following standards.

  • Page 124: Inserting And Removing Pc Card

    10.2 Inserting and Removing PC Card How to Insert a PC Card To the PC card slot on the side of the CW120/121, insert a PC card with its front side up and in the direction of the arrow on top.

  • Page 125: Storage Capacity

    NOTE To ensure that data can be saved, delete all files from the PC card other than measured-data files and setting files. Be careful that the total number of files in a card does not exceed 100. 10-3 IM CW120-E...

  • Page 126: Formatting Pc Card

    10.4 Formatting PC Card The CW120/121 can format a PC card in MS-DOS format. Format the card before using a newly purchased card, or to erase all files in the card. Formatting a PC Card with CW120 (1) Insert the PC card in the slot.

  • Page 127: Saving And Loading From/To Pc Card

    For details of the respective settings, see Chapter 7, “Making Settings.” For details of data saving during instantaneous value measurement, see Section 8.3, “Saving Data.” For details of data saving during electric energy measurement, see Section 9.4, “Saving Data.” 10-5 IM CW120-E...
  • Page 128 This data contained in the backup memory can be copied to a PC card. SEE ALSO For details of how to copy data from the backup memory, see Section 7.2.5, “Copying and Clearing Backup Memory Contents.” 10-6 IM CW120-E...

  • Page 129: Interface With Personal Computer

    PC card slot of a PC. Even when a PC card is left inserted in a CW120 or CW121, the measured data in the PC card can be read from a PC and the setting data can be written from the PC via RS-232* or RS-485* communication.

  • Page 131: Chapter 11 Communication Functions

    CW120/121. RS-232 Interface Connections When connecting a CW120 or CW121 to a computer or printer via its RS- 232 interface, you need to make interface settings such as handshaking methods, data transmission speed (baud rate), and data bit length to match those settings in the computer.
  • Page 132 CCITT Standard, and JIS (Japanese Industrial Standard) Signal Names and Pin Assignment Abbreviations Pin No. Name (in 9 Pins) RS-232 CCITT AB (GND) Signal Ground BA (TXD) Transmit Data BB (RXD) Receive Data CA (RTS) Request To Send CB (CTS) Clear To Send 11-2 IM CW120-E...
  • Page 133 When Selecting OFF/OFF • Transmission Control No handshake is performed between the CW120/121 and computer. The CW120/121 handles the X-off and X-on codes from the computer as data and ignores CTS (CS in JIS). • Reception Control No handshake is performed between the CW120/121 and computer.
  • Page 134 When the free space in the reception buffer decreases to 256 bytes, the CW120/121 transmits the X-off code to the computer. When the free space in the reception buffer increases to 768 bytes, the CW120/ 121 transmits the X-on code to the computer. RTS (RS in JIS) is always true.
  • Page 135 Used When developing the computer’s communication program, be careful about the data transmission rate so that the reception buffer either in the CW120/121 or in the computer will not become full. 11-5 IM CW120-E...

  • Page 136: Rs-485

    Software handshake: Not available Error detection: 2-byte simple summation checksum Reception buffer length: 1024 bytes Maximum transmission distance: 1.2 km (when using shielded cable containing 2 twisted pairs of AWG 24 conductors) Terminating resistor: Approx. 120Ω built-in 11-6 IM CW120-E...
  • Page 137 See the figure below for the wiring of RS-485 cables (in two-wire method) to connect to a personal computer. When using the RS-232 port of the PC, you need an RS-232/RS-485 converter. RS-232 RS-232/RS-485 Example: Yokogawa M&C ML1 converter converter Terminating resistor: On Terminating resistor: On CW120/121...
  • Page 138 11.2 RS-485 Device Address A device address needs to be assigned to each device on an RS-485 network. The device number set in each CW120/121 is identified as the device address. SEE ALSO For device address setting, see Section 7.2.1, “Setting Device Number,” in Chapter 7, “Making Settings.”...

  • Page 139: Data Format

    11.3 Data Format The serial interface of the CW120/121 performs asynchronous transmission. In an asynchronous transmission, each character is carried in such a way that 7 or 8 data bits are preceded by a start bit and followed by a parity bit (optional), and 1 or 2 stop bits in order (see also the figure below).

  • Page 141: Chapter 12. Auxiliary Functions

    Chapter 12. Auxiliary Functions 12.1 Convenient Functions Clock The CW120/121 have a built-in clock, which is adjusted to the Japan standard time by default (factory setting). The date and time display formats are YY (YY is the last two digits of the year) and hh:mm:ss, as shown below.
  • Page 142 Upper: Model number Lower: Version number Power switch START &STOP ESC key START&STOP key ALL CLEAr appears on the screen, and then the measurement screen is displayed. All Clear Screen Measurement Screen Upper: Rms voltage Lower: Rms current 12-2 IM CW120-E...

  • Page 143: Using Optional Printer

    Connection Use the RS-232 port. Printer cable: Model 91010 1. Turn off the power to the printer. (The power lamp turns off.) 2. Connect the printer to the CW120/121 as shown in the figure below. Printer Power switch Online switch...
  • Page 144 Parity (use/not use) Not use 3 (ON) Parity (even/odd) Even 4 (OFF) Flow control H/W BUSY XON/XOFF 5 (OFF) 6 (ON) Baud rate = 9600 bps 7 (ON) 8 (ON) 3. Turn off the power to the printer. 12-4 IM CW120-E...
  • Page 145 • If the characters printed with the print mode selection in DIP SW-2 set to 80 columns (OFF) are too small to read, change the setting to 40 columns (ON). Setting in CW120/121 When using a printer, a setting needs to be made also in the CW120/121. Procedure With reference to Section 7.2.11, “Selecting Communication Device,” in Chapter 7, “Making Settings,”...
  • Page 146 For print data, see Appendix 3, “File Structures and Data Items Printed.” The printout above is an example when the print mode is set to 40 columns (ON) in DIP SW-2. See the DIP switch settings described on the page before the previous one. 12-6 IM CW120-E...

  • Page 147: Chapter 13. Troubleshooting

    Failure This section describes corrective measures in case a failure occurs with the CW120 or CW121. If the meter does not operate properly after taking the corrective measures shown in the table below or any other failure that is not covered in this section occurs, contact the vendor from which you purchased the instrument.

  • Page 148: Error Codes

    The electric energy value or elapsed time of integration is not zero. No change to setting allowed. The product of [rated power × VT ratio × CT ratio × 1.3] exceeds 9999 GW. To return to the measurement screen from the error display, press any key. 13-2 IM CW120-E...

  • Page 149: Chapter 14. Specifications

    Chapter 14. Specifications 14.1 Specifications of CW120/121 (1) Inputs Item Voltage Inputs Current Inputs Input type Resistive potential division Clamp sensing 96033 clamp-on probe: 5, 10, 20, 50 A 96030 clamp-on probe: 20, 50, 100, 200 A Ratings (ranges) 150, 300, 450 V...
  • Page 150 14.1 Specifications of CW120/121 (3) Instantaneous Value Measurement Measured parameters Rms voltage (V), rms current (A), active power (W), frequency (Hz) Measurement accuracy At power factor = 1 (including clamp-on probes) Voltage ±(0.3% rdg + 0.2% rng) Current and active power ±(0.8% rdg + 0.4% rng) with probe 96030, 96031,...
  • Page 151 Note 1: For distorted or unbalanced wave inputs, there may be discrepancies between the CW120/121 and other instruments that operate based on different measurement principles. Note 2: The plus/minus sign is displayed by multiplying the polarity obtained based on the varmeter method.
  • Page 152 14.1 Specifications of CW120/121 (6) Display Functions Display screen Backlit segmented LCD Maximum display digits 4 digits for data other than electric energy 6 digits for electric energy Ranges (ratings) 96032 Probe (200–1000 A) 96031 Probe (50–500 A) 96030 Probe (20–200 A) 96033 Probe (5–50 A)
  • Page 153 Within accuracy range at 400 A/m Dimensions (W × H × D) Approximately 117 × 161 × 51 mm Weight Approximately 0.6 kg Terminals Voltage inputs CW120: 3 jacks for banana plugs (safety terminals) CW121: 4 jacks for banana plugs (safety terminals) 14-5 IM CW120-E...
  • Page 154 14.1 Specifications of CW120/121 Current inputs (H/L) CW120: 2 pair jacks for banana plugs (safety terminals) CW121: 3 pair jacks for banana plugs (safety terminals) External control input/output 3 screw-less terminals (H/L/H) RS-485 4 M3 screw terminals (+/–/SG/TM) Connectors RS-232...
  • Page 155 (14) CW120/121 Exterior Unit: mm (approx. inches) 117 (4.6) 51 (2.0) Note: This figure shows the CW121, but there is no difference in exterior from the CW120. 14-7 IM CW120-E...

  • Page 156: Specifications Of Clamp-On Current Probes

    Compliant with EN55011, Group 1, Class A; and EN61326: 1997 These products are goods in Class A (designed for industrial environments). For home use, the user must implement adequate measures to prevent influences from radio noise emission. 14-8 IM CW120-E...
  • Page 157 EMC (immunity): Compliant with EN61326: 1997 Effect on measurement input under immunity environment: ±20% of range or less Dimensions of 96030 and 96031 Clamp-on Current Probes Unit: mm 73 (2.9) (approx. inches) (1.2) 57 (2.2) 60 (2.4) 14-9 IM CW120-E...
  • Page 158 Banana plugs (safety terminals) Output cable length Approximately 3 meters Standard accessories One User’s Manual, ring markers (4 colors × 2 each, L4007MG) Dimensions of 96032 Clamp-on Current Probe 100 (3.9) Unit: mm 24.7 (approx. inches) 66 (2.6) (1.0) (1.3) 14-10 IM CW120-E...
  • Page 159 For home use, the user must implement adequate measures to prevent influences from radio noise emission. EMC (immunity): Compliant with EN61326: 1997 Effect on measurement input under immunity environment: ±20% of range or less 14-11 IM CW120-E...
  • Page 160 14.2 Specifications of Clamp-on Current Probes Dimensions of 96033 Clamp-on Current Probe Unit: mm (approx. inches) 10.5 (0.99) (0.41) (1.6) 14-12 IM CW120-E...

  • Page 161: Appendix 1. Circuit Block Diagram

    Appendix Appendix 1. Circuit Block Diagram App 1-1 IM CW120-E...
  • Page 163 1.7.5 STATus Group ................... App 2-17 1.7.6 MEMOry Group ................App 2-18 1.7.7 CARD Group ..................App 2-18 1.7.8 Common Group ................App 2-19 2. Error Messages ..................App 2-20 3. Command Effectiveness Tables ............App 2-24 App 2-1 IM CW120-E...

  • Page 164: Commands

    Response Messages As explained earlier, response messages are Program Messages sent by the CW120 to the personal computer. As explained above, program messages are The format of a response message is shown sent from the personal computer to the CW120.

  • Page 165: Appendix 2. Communication Commands

    Appendix 2. Communication Commands <Response header> • If a program message contains multiple units It is possible to program the CW120 so a and some of the units are incomplete, the response header precedes the response data. CW120 will pick up the incomplete units and Response data is separated from the header by attempt to execute them.

  • Page 166: Commands

    CW120. They differ in the the assumption that the next command will also format of their program headers.

  • Page 167: Response

    A query with a question mark (?) on the Upon receiving a query from the personal topmost-level command in a group is called a computer, the CW120 returns a response higher-level query. Executing a higher-level message to the computer. A response query allows all the setup data items available message is sent in either of the following forms.

  • Page 168: Data

    Megaampere, write as "MAA". • If the value specified is beyond the precision • If both <Multiplier> and <Unit> are omitted, of the CW120, the value will be rounded. the default unit (V, A or Hz) will be used. App 2-6...
  • Page 169 (') or double quotation mark Form Example (") will cause the CW120 to interpret the {V1 | V2 | V3} program message unit as part of the • As with the header, the COMMunicate: <character string data>.

  • Page 170: Messages On Rs-485

    CW120 (or CW121) returns a response message. If a received program message does not contain a query command, the CW120 (or CW121) returns OK or ERROR as a response message. Also in response to a syntax error in a program message, the CW120 returns ERROR.
  • Page 171 Queries all the settings relating to the data output, file name, and :INTEgrate:STORe? output interval Sets/queries whether data output is set to ON or OFF :INTEgrate:STORe:STATe Sets/queries the name of a file to be saved :INTEgrate:STORe:FILEname Sets/queries the output interval :INTEgrate:STORe:INTErval App 2-9 IM CW120-E...
  • Page 172 Queries all the settings relating to transfer of a specified range of :CARD:PICKout? file contents Sets/queries the transfer end point :CARD:PICKout:END Transfers the specified range of the contents of the file that was :CARD:PICKout:SEND? specified using the :CARD:FILEname and :CARD:TYPE commands App 2-10 IM CW120-E...
  • Page 173 Queries the PC card status :CARD:STATe Sets/queries which type of files in the PC card is to be accessed :CARD:TYPE Common Command Group Clears the error queue *CLS Queries the meter model *IDN? App 2-11 IM CW120-E...

  • Page 174: Communication Commands

    Bit 1: Framing error Bit 2: BREAK character detected Bit 3 and later: Always 0 If one of the causes noted above occurs, the corresponding status bit is set. The bit is cleared when the status is read. App 2-12 IM CW120-E...

  • Page 175: System Group

    Function Sets/queries whether the key-lock 3: 200 to 1000 A function is set to ON or OFF. Syntax :SYSTem:KLOCk? :SYSTem:CURRent? :SYSTem:KLOCk {<Boolean>} Function Queries all the settings relating to the current range. :SYSTem:RESEt Syntax :SYSTem:CURRent? Function Executes system resetting. App 2-13 IM CW120-E...
  • Page 176 <NRf3> = second: 0 to 59 :SYSTem:VOLTage? Function Queries all the settings relating to the voltage range. Syntax :SYSTem:VOLTage? :SYSTem:VOLTage:RANGe Function Sets/queries the voltage range. Syntax :SYSTem:VOLTage:RANGe? :SYSTem:VOLTage:RANGe {<NRf>} <NRf> = 0: 150 V 1: 300 V App 2-14 IM CW120-E...

  • Page 177: Integrate Group

    Function Queries all the settings relating to :INTEgrate:STARt? the end of measurement. Function Queries all the settings relating to Syntax :INTEgrate:STOP? the start of measurement. Syntax :INTEgrate:STARt? :INTEgrate:STOP:EXECute Function Stops measurement. :INTEgrate:STARt:EXECute Syntax :INTEgrate:STOP:EXECute Function Starts measurement. Syntax :INTEgrate:STARt:EXECute App 2-15 IM CW120-E...
  • Page 178 3: 00000.0 Syntax :INTEgrate:STORe:FILE? 4: 000000 :INTEgrate:STORe:FILE <Filename> :INTEgrate:WH:UNIT <Filename> = Up to 8 characters Function Sets/queries the display unit of electric energy. Syntax :INTEgrate:WH:UNIT? :INTEgrate:WH:UNIT {<NRf>} <NRf> = 0: Wh 1: kWh 2: MWh 3: GWh App 2-16 IM CW120-E...

  • Page 179: Measure Group

    • You can set whether or not to add electric energy measurement to ON. the message contents using the Syntax :MEASure:INTEgrate:ITEM "STATus:QMESsage" command. :ALL :STATus:OMESsage Function Sets/queries whether or not to add the message contents to the STATus:ERRor? response. Syntax :STATus:OMESsage {<Boolean>} :STATus:OMESsage? App 2-17 IM CW120-E...

  • Page 180: Memory Group

    :CARD:PICKout:STARt command. {<NRf>} Syntax :CARD:DIREctory? <NRf> = 1 to 2147483647 :CARD:FILEname Function Sets/queries the names of all files that reside in the PC card. Syntax :CARD:FILEname? :CARD:FILEname {<Filename>} <Measured data items> = Up to 8 characters App 2-18 IM CW120-E...

  • Page 181: Common Group

    1: A card is set. :CARD:TYPE Function Sets/queries which type of files in the PC card is to be accessed. Syntax :CARD:TYPE :CARD:TYPE {<NRf>} <NRf> = 1: Auto-storing file 3: File containing currently measured values 4: Setting file App 2-19 IM CW120-E...

  • Page 182: Error Messages

    • Command syntax errors: Codes 100 to 199 • Communication execution errors: Codes 200 to 299 • Query errors: Codes 400 to 499 • Command execution errors: Codes 600 to 799 • System error: Code 912 App 2-20 IM CW120-E...
  • Page 183 String data error STRING DATA The parameter in <character string> format is too long or contains an invalid string. Invalid string data STRING DATA Set the parameter in a format other than <character string>. String data not allowed App 2-21 IM CW120-E...
  • Page 184 Check the transmission-reception sequence. Check the transmission-reception sequence. Query UNTERMINATED Limit the length of each program message within 1024 Query DEADLOCKED bytes including the <PMT>. Query UNTRMINATED Do not code a query following “*IDN?”. after indefinite response App 2-22 IM CW120-E...
  • Page 185 System Error (Code 912) Code Message Countermeasure Needs to be serviced. Fatal error Communication-driver Other Errors (Codes 350 and 390) Code Message Countermeasure Queue overflow Read the error queue. Overrun error(RS-232) Decrease the baud rate. App 2-23 IM CW120-E...

  • Page 186: Command Effectiveness Tables

    Appendix 2. Communication Commands Command Effectiveness Tables (1) COMMunicate Group Status Integration in Integration Wiring Check Setting Progress Stopped Command : COMMunicate? : HEADer? : HEADer : STATus? : VERBose? : VERBose : Effective Blank: Ineffective App 2-24 IM CW120-E...
  • Page 187 : VT? Cond. : VT : TIME? : TIME : VOLTage? : VOLTage : RANGe? Cond. : RANGe : WIRIng? Cond. : WIRIng : Effective Blank : Ineffective Cond.: Conditional; setting is not allowed during integration App 2-25 IM CW120-E...
  • Page 188 : TIME? : TIME : STORe? : STORe : STATe? : STATe : FILEname? : FILEname : INTErval? : INTErval : WH? : WH : DIGI? : DIGI : UNIT? : UNIT : Effective Blank: Ineffective App 2-26 IM CW120-E...
  • Page 189 : STATus? : STATus : ERRor? : OMESsage? : OMESsage : Effective Blank: Ineffective (6) MEMOry Group Status Integration in Integration Wiring Check Setting Progress Stopped Command : MEMOry : DATA? : SEND? : Effective Blank: Ineffective App 2-27 IM CW120-E...
  • Page 190 : STARt : SEND? : SETT : STATe? : TYPE? : TYPE : Effective Blank: Ineffective (8) Common Command Group Status Integration in Integration Wiring Check Setting Progress Stopped Command *CLS *IDN? : Effective Blank: Ineffective App 2-28 IM CW120-E...

  • Page 191: Appendix 3. File Structures And Data Items Printed

    2.2.1 Print Item Titles and Data Formats ............. App 3-5 3. Settings ....................App 3-6 3.1 File Format ..................App 3-6 3.2 Output Format and Data Values ........... App 3-7 3.3 Print Format ................... App 3-9 4. Automatic File Naming ................ App 3-10 App 3-1 IM CW120-E...

  • Page 192: Overview

    Pressing the SAVE key outputs the measured data to a file. • Automatic saving: Measured data is output to a file periodically at a specified interval after measurement begins. (2) Settings The current settings of measurement conditions are output to a file or printer. App 3-2 IM CW120-E...

  • Page 193: Measured Data

    ← Measured value record 2 2.1.1 File Identifier Characters for identifying that the file was created by a CW120 or CW121 are output. File identifier: CW12x 2.1.2 File Type The file type identification code is output following “FileType”.

  • Page 194: Data Field Titles And Data Formats

    ← Title of measured data items (data field titles) yyyy/mm/dd,hh:mm:ss,…(measured value)…,x.xxxxxE+xx ← Data values before power failure “POWER OFF”,yyyy/mm/dd,hh:mm:ss ← Power failure information “POWER ON”,yyyy/mm/dd,hh:mm:ss ← Power restoration information yyyy/mm/dd,hh:mm:ss,…(measured value)…,x.xxxxxE+xx ← New data values after restoration App 3-4 IM CW120-E...

  • Page 195: Print Format

    ±0.000E ±00 Reactive power (Var) ±0.000E ±00 Power factor ±0.000E ±00 Frequency (Hz) Wh(+) ±0.00000E ±00 Electric energy (Wh) Wh(–) ±0.00000E ±00 Regenerative energy (Wh) Note: An invalid or overflowed value is printed as “----” or “OR”. App 3-5 IM CW120-E...

  • Page 196: Settings

    Setting files are text files. In the same way as in measured-data files, the contents of each setting file begin with the file identifier, file type number, and measurement mode. “CW12x” FileType MeasureMode Wiring SetVRange MeasVRange · · · ClampType Device BaudRate DataLength Parity StopBit Handshaking x: Setting App 3-6 IM CW120-E...

  • Page 197: Output Format And Data Values

    WhDigit 0 to 4 Display digits of electric energy 0: Standard 1: 000.000 2: 0000.00 3: 00000.0 4: 000000 WhUnit 0 to 3 Display unit of electric energy 0: Wh 1: kWh 2: MWh 3: GWh App 3-7 IM CW120-E...
  • Page 198 7 or 8 bits Parity 0 to 2 Parity 0: None 1: Even 2: Odd StopBit 1 or 2 Stop bits 1 or 2 bits Handshaking 0 to 3 Flow control 0: ON/OFF 1: XON/XOFF 2: XON/RS 3: CS/RS App 3-8 IM CW120-E...

  • Page 199: Print Format

    Appendix 3. File Structures and Data Items Printed Print Format The print format is as shown below. yyyy/mm/dd hh:mm:ss Wiring SetVRange MeasVRange · · · ClampType Device BaudRate DataLength Parity StopBit Handshaking x: Setting App 3-9 IM CW120-E...

  • Page 200: Automatic File Naming

    When the file name is not specified (though users can specify the name only for automatic saving), the power meter automatically names the file as follows: Automatic saving: AWTHxxx.CSV Manual saving of instantaneous values: MWTHxxx.CSV Setting file: WTHxxx.SET where xxx is the smallest, unused number from 000 to 029. App 3-10 IM CW120-E...

  • Page 201: Index

    1-3, 1-4, 2-5, 4-6, 8-1, 8-3, 9-4, 9-6, 9-12, 9-15, 8-4, 9-1, 9-8, 9-10, 9-12, 10-5, 10-6 9-18, 10-5, 12-6, 14-2, App2-2 Date ....1-3, 2-8, 2-9, 4-5, 7-1, 7-9, 7-11, 8-6, 9-14, 9-21, 12-1, 12-2, App2-4, App2-5 Index-1 IM CW120-E...
  • Page 202 7-15, 7-16, 7-18, 7-19, 7-20, 7-18, 8-4, 8-5, 9-3, 9-4, 9-6, 7-21, 7-22, 7-24, 7-27, 7-29, 9-12, 9-13, 9-14, 9-15, 9-16, 7-30, 7-31, 9-9, 9-16, 9-17, 9-21, 10-1, 10-2, 10-3, 10-4, 10-4, 10-6 10-5, 10-6, 10-7, 13-2, 14-4, Index-2 IM CW120-E...
  • Page 203 App2-26, App2-27, App2-28 Check Function ......5-6 Diagrams ........5-2 Method ..1-3, 1-4, 2-5, 2-8, 5-3, 5-5, 5-7, 6-1, 6-6, 6-7, 6-9, 6-10, 7-27, 8-1, 8-2, 8-3, 8-5, 9-1, 9-2, 9-10, 9-11, 12-6, App2-4, App2-5 Methods ........5-2 Index-3 IM CW120-E...
  • Page 205 YOKOGAWA CORPORATION OF AMERICA (U.S.A.) Phone: 1-770-253-7000 Facsimile: 1-770-251-2088 YOKOGAWA EUROPE B. V. (THE NETHERLANDS) Phone: 31-334-64-1611 Facsimile: 31-334-64-1610 YOKOGAWA AMERICA DO SUL S. A. (BRAZIL) Phone: 55-11-5681-2400 Facsimile: 55-11-5681-1274 YOKOGAWA ENGINEERING ASIA PTE. LTD. (SINGAPORE) Phone: 65-6241-9933 Facsimile: 65-6241-2606...

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