YOKOGAWA WT310 User Manual
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YOKOGAWA WT310 User Manual

Digital power meter
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User's
Manual
WT310/WT310HC/WT330
Digital Power Meter
Getting Started Guide
IM WT310-02EN
1st Edition

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Summary of Contents for YOKOGAWA WT310

  • Page 1 User’s Manual WT310/WT310HC/WT330 Digital Power Meter Getting Started Guide IM WT310-02EN 1st Edition...

  • Page 2: Product Registration

    Product Registration Thank you for purchasing YOKOGAWA products. YOKOGAWA provides registered users with a variety of information and services. Please allow us to serve you best by completing the product registration form accessible from our homepage. http://tmi.yokogawa.com/ PIM 103-03E...
  • Page 3 Thank you for purchasing the WT310, WT310HC, or WT330 Digital Power Meter (hereinafter, “WT310/ WT310HC/WT330” will refer to all of these products). The WT310/WT310HC/WT330 is a power measurement instrument that can measure parameters such as voltage, current, and power. This getting started guide primarily explains the handling precautions and basic operations of the WT310/WT310HC/WT330.

  • Page 4: Checking The Contents Of The Package

    50 mV/100 mV/200 mV/500 mV/1 V/2 V external input Harmonic measurement /DA4 DA output (4CH); for the WT310 or WT310HC /DA12 DA output (12CH); for the WT332 or WT333 1 Make sure that the attached power cord meets the designated standards of the country and area that you are using it in.

  • Page 5: Standard Accessories

    Same number of sets as the number of installed input elements WT310: One set with one hexagonal socket wrench WT310HC: One set with one hexagonal socket wrench WT332: Two sets with one hexagonal socket wrench...
  • Page 6 • WT310/WT310HC/WT330 Digital Power Meter User’s Manual IM WT310-01EN • WT310/WT310HC/WT330 Digital Power Meter Getting Started Guide IM WT310-02EN • WT310/WT310HC/WT330 Digital Power Meter Communication Interface User’s Manual IM WT310-17EN Japanese • WT310/WT310HC/WT330 Digital Power Meter User’s Manual IM WT310-01JA •...
  • Page 7 Rated voltage 1000 V.* Rated current: 25 A. Conversion adapter 758924 BNC-4 mm socket adapter. Rated voltage: 500 V.* * The actual voltage that can be used is the lowest voltage of the WT310/WT310HC/WT330 and cable specifications. Measurement Safety terminal...

  • Page 8: Safety Precautions

    The general safety precautions described herein must be observed during all phases of operation. If the instrument is used in a manner not specified in this manual, the protection provided by the instrument may be impaired. YOKOGAWA assumes no liability for the customer’s failure to comply with these requirements.
  • Page 9 To prevent the possibility of electric shock or fire, be sure to use the power cord supplied by YOKOGAWA. The main power plug must be plugged into an outlet with a protective earth terminal. Do not invalidate this protection by using an extension cord without protective earth grounding.
  • Page 10 See below for operating environment limitations. CAUTION This is a class A instrument designed for an industrial environment. Operation of this product in a residential area may cause radio interference in which case the user will be required to correct the interference. viii IM WT310-02EN...

  • Page 11: Waste Electrical And Electronic Equipment

    With reference to the equipment types in the WEEE directive Annex I, this product is classified as a “Monitoring and control instruments” product. Do not dispose in domestic household waste. When disposing products in the EU, contact your local Yokogawa Europe B. V. office. New EU Battery Directive New EU Battery Directive, DIRECTIVE 2006/66/EC (This directive is valid only in the EU.)

  • Page 12: Conventions Used In This Manual

    Calls attention to information that is important for the proper operation of the software. Characters That Appear on the 7-Segment LED Because this instrument uses a 7-segment LED display, numbers, letters, and mathematical symbols are displayed using special characters. For details, see section 1.3, “Digital Numbers and Characters.” IM WT310-02EN...
  • Page 13 This section describes the setup items and the limitations regarding the procedures. It may not give a detailed explanation of the feature. For a detailed explanation of the feature, see chapter 1 in the User’s Manual, IM WT310-01EN. IM WT310-02EN...

  • Page 14: Workflow

    Workflow The figure below is provided to familiarize the first-time user with the workflow of WT310/WT310HC/ WT330 operation. For a description of an item, see the relevant section or chapter. In addition to the sections and chapters that are referenced in the figure below, this manual also contains safety precautions for handling and wiring the instrument.

  • Page 15: Table Of Contents

    Setting the Measurement Ranges ..................4-1 Configuring the Wiring System Settings (Only on the WT330) ........4-4 Displaying the Voltage, Current, and Active Power on the WT310/WT310HC ....4-5 Displaying Voltages, Currents, and Active Powers on the WT330 ........4-6...
  • Page 16 7.10 USB PC Interface ......................7-15 7.11 Ethernet Interface(/C7 Option) ..................7-15 7.12 Safety Terminal Adapter ....................7-16 7.13 General Specifications ....................7-17 7.14 External Dimensions ...................... 7-19 Appendix Appendix 1 How to Make Accurate Measurements .............. App-1 IM WT310-02EN...

  • Page 17: Chapter 1 Component Names And Functions

    Used to communicate with the WT310/WT310HC/WT330 through the GP-IB or RS-232 interface → Communication Interface User’s Manual Ethernet port Used to connect the WT310/WT310HC/WT330 to a network → Communication Interface User’s Manual External I/O connector For connecting D/A output and remote control cables →...
  • Page 18 1.1 Front Panel, Rear Panel, and Top Panel Top Panel Inlet holes → section 2.2 (There are also inlet holes on the bottom panel.) Vent holes → section 2.2 IM WT310-02EN...
  • Page 19 For connecting D/A output and remote control cables → chapter 5 Power inlet Power connection → section 2.3 USB port for PCs Used to connect the WT310/WT310HC/WT330 to a PC that has a USB port → Communication Interface User’s Manual IM WT310-02EN...
  • Page 20 1.1 Front Panel, Rear Panel, and Top Panel Top Panel Inlet holes → section 2.2 (There are also inlet holes on the bottom panel.) Vent holes → section 2.2 IM WT310-02EN...

  • Page 21: Displayed Items

    When you start storage, this indicator blinks at the pace at which storage is taking place. Key protection indicator (KEY PROTECT) Lights when the keys are locked Remote indicator (REMOTE) Lights when the WT310/WT310HC/WT330 is in remote mode IM WT310-02EN...
  • Page 22 When you start storage, this indicator blinks at the pace at which storage is taking place. Key protection indicator (KEY PROTECT) Lights when the keys are locked Remote indicator (REMOTE) Lights when the WT310/WT310HC/WT330 is in remote mode IM WT310-02EN...

  • Page 23: Digital Numbers And Characters

    Because this instrument uses a 7-segment LED display, numbers, letters, and mathematical symbols are displayed using special characters in the manner shown below. Some of the characters shown below are not used by this instrument. ^ (exponentiation) Lowercase c – Lowercase h × ÷ Index IM WT310-02EN...

  • Page 24: Keys

    SHIFT+VOLTAGE (MODE) Key Switches the measurement mode. Wiring System WIRING Key (Only on the WT330) Select the wiring system that corresponds to the wiring system you are using to connect to the voltage and current terminals on the rear panel. IM WT310-02EN...
  • Page 25 Confirms the specified range, feature, or value Index Zero-Level Compensation SHIFT+SET Key (CAL) Executes zero-level compensation. When zero-level compensation is executed, the WT310/WT310HC/ WT330 creates a zero input condition in its internal circuitry and sets the zero level to the level at that point. IM WT310-02EN...

  • Page 26: Key Lock

    Displays the communication interface setting menu and connection information Key Lock SHIFT+INTERFACE (KEY PROTECT) Key Turns key protection on and off. The key protection indicator lights, and the front panel keys are locked. Press this key combination again to unlock the keys. 1-10 IM WT310-02EN...
  • Page 27 SHIFT (LOCAL) Key Press this key to switch from remote mode (in which the REMOTE indicator is illuminated) to local mode (in which front panel key operations are valid). This key is disabled when the WT310/WT310HC/ WT330 is in local lockout mode.

  • Page 28: Auto Range, Overrange, And Error Indications During Measurement

    Power factor or phase angle Measurement Suspension/No Data Indication (Dashes) When the measurement range, function, or element is switched and the displayed contents change or when there is no data to display, the following dashes are displayed temporarily. 1-12 IM WT310-02EN...
  • Page 29 1.5 Auto Range, Overrange, and Error Indications During Measurement Error Displayed in cases such as when a measured value is outside of its determined range. Index 1-13 IM WT310-02EN...

  • Page 30: System Configuration

    GP-IB interface RS-232 interface D/A output (option) Ethernet interface (optional) Measured values are transmitted Setup parameters Numeric data as DC voltages. Recorder Printer * The WT310/WT310HC/WT330 is standard-equipped with a GP-IB or RS-232 interface (whichever you choose). 1-14 IM WT310-02EN...

  • Page 31: Chapter 2 Making Preparations For Measurements

    Do Not Remove the Case Do not remove the case from the instrument. Some parts of the instrument use high voltages and are extremely dangerous. For internal inspection and adjustment, contact your nearest YOKOGAWA dealer. Unplug If Abnormal Behavior Occurs If you notice smoke or unusual odors coming from the instrument, immediately turn off the power and unplug the power cord.
  • Page 32 When cleaning the case or the operation panel, turn off the circuit under measurement and the instrument and remove the instrument’s power cord from the outlet. Then, wipe the instrument lightly with a clean dry cloth. Do not use chemicals such as benzene or thinner. Doing so may cause discoloring and deformation. IM WT310-02EN...

  • Page 33: Installing The Instrument

    Condensation may occur if the instrument is moved to another place where the ambient temperature or humidity is higher, or if the temperature changes rapidly. In these kinds of circumstances, wait for at least an hour before using the instrument, to acclimate it to the surrounding temperature. IM WT310-02EN...
  • Page 34 Movable legs WARNING • When adjusting the WT310/WT310HC handle, be careful not to injure your hand with the edges of the handle. • When you put away the handle or movable legs, be careful not to get your hand caught between the handle or movable legs and the instrument.
  • Page 35 2.2 Installing the Instrument Rack Mounting To mount the instrument on a rack, use a rack mount kit (sold separately). • For the WT310/WT310HC Item Model Note Rack mount kit 751533-E2 For EIA single mount Rack mount kit 751533-J2 For JIS single mount...

  • Page 36: Connecting The Power Supply

    • Connect the power cord after checking that the power switch of the instrument is turned OFF. • To prevent fire and electric shock, only use a power cord supplied by YOKOGAWA. • To avoid electric shock, be sure to ground the instrument. Connect the power cord to a three-prong power outlet with a protective earth terminal.

  • Page 37: Turning The Power Switch On And Off

    For details about initializing the settings, see section 3.3, “Initializing Settings.” • If the instrument still does not work properly, contact your nearest YOKOGAWA dealer for repairs. • If an error code is displayed, see section 6.2, “Error Code Descriptions and Corrective Actions,” and take the appropriate actions.
  • Page 38 (see section 6.2, “Error Code Descriptions and Corrective Actions”). If this message appears frequently, you need to replace the battery soon. Do not try to replace the battery yourself. Contact your nearest YOKOGAWA dealer to have the battery replaced. Power-on Messages Power on All the LEDs light.

  • Page 39: Precautions When Wiring The Circuit Under Measurement

    • For safety reasons, after you connect the measurement cables, use the included screws to attach the current input protection cover (screw tightening torque: 0.6 N•m). Make sure that the conductive parts do not protrude from the protection cover. IM WT310-02EN...
  • Page 40 Peak value of 2.8 kV or rms value of 2 kV, whichever is less. Current input Direct input • WT310 and WT330 When the crest factor is 3: 0.5 A to 20 A When the crest factor is 6: 0.25 A to 10 A Peak value of 450 A or rms value of 300 A, whichever is less.
  • Page 41 Peak value of 1.5 kV or rms value of 1.0 kV, whichever is less. Current input Direct input • WT310 and WT330 When the crest factor is 3: 0.5 A to 20 A When the crest factor is 6: 0.25 A to 10 A Peak value of 100 A or rms value of 30 A, whichever is less.

  • Page 42: Assembling The Adapters For The Voltage Input Terminals

    Assembling the Adapters for the Voltage Input Terminals When connecting a measurement cable to a WT310/WT310HC/WT330 voltage input terminal, use the included 758931 Safety Terminal Adapter or the 758923 Safety Terminal Adapter (sold separately). 758931 Safety Terminal Adapter Cover Internal insulator Plug When using the 758931 Safety Terminal Adapter, assemble it according to the following procedure.
  • Page 43 2.6 Assembling the Adapters for the Voltage Input Terminals Explanation Wire the adapters that come with the WT310/WT310HC/WT330 or the adapters and various sensors that are sold separately as shown below: Wiring to a Voltage Input Terminal Voltage under measurement...

  • Page 44: Wiring For Accurately Measuring A Single-Phase Device

    ± ± LOAD LOAD SOURCE SOURCE ± ± ± ± Explanation For details on the effects of stray capacitance and the effects of the measured voltage and current amplitudes, see appendix 3, “How to Make Accurate Measurements.” 2-14 IM WT310-02EN...

  • Page 45: Guide For Selecting The Method Used To Measure The Power

    Voltage transformer (VT) → section 2.11 Current Measurement Methods When the Voltage Is 600 V or Less When the Current When the Current WT310 or WT330 When the Voltage Is 20 A or Less Exceeds 20 A Product Exceeds 600 V...

  • Page 46: Wiring The Circuit Under Measurement For Direct Input

    Confirm that no foreign materials are caught between the current input terminal and the crimped terminal. Periodically confirm that the current input terminal is not loose and that there are no foreign materials caught between the current input terminal and the crimped terminal. 2-16 IM WT310-02EN...
  • Page 47 For precautions about using crimped terminals and crimping tools, see the manuals for the crimped terminal and the crimping tool that you are using. 2-17 IM WT310-02EN...
  • Page 48 2.9 Wiring the Circuit under Measurement for Direct Input Connecting to the WT310/WT310HC In the wiring examples that follow, the WT310/WT310HC input elements, voltage input terminals, and current input terminals are simplified as shown in the following figure. Input element...
  • Page 49 Generally, it is easier to follow the wiring diagram if you wire to the current input terminals first and then to the voltage input terminals. In this example as well, we will wire to the WT310 current input terminals first and then to the voltage input terminals.
  • Page 50 2.9 Wiring the Circuit under Measurement for Direct Input Strip the insulation of the power cable that you cut, and attach round crimped terminals if necessary. Connect the power cable to the WT310 in the following ways. • Power-source-side cable: Connect to the ± current input terminal.
  • Page 51 You can avoid wiring mistakes by connecting a red adapter to the high-voltage cable and a black adapter to the low-voltage cable. Black Safety terminal adapter Connect the safety terminal adapters to the WT310 voltage input terminals. • Red adapter: Connect to the VOLTAGE voltage input terminal. •...
  • Page 52 2.9 Wiring the Circuit under Measurement for Direct Input You can also connect to the circuit under measurement by placing a terminal block near the WT310 and connecting the power cables and voltage measurement cables to the terminal block. Terminal block...
  • Page 53 ± Input element 1 Input element 1 SOURCE LOAD SOURCE LOAD ± ± ± ± SOURCE LOAD SOURCE LOAD ± ± ± ± Input element 1 Input element 1 ± ± LOAD LOAD SOURCE SOURCE ± ± 2-23 IM WT310-02EN...
  • Page 54 The wiring is connected to input elements 1, 2, and 3. ± SOURCE LOAD ± SOURCE LOAD ± ± ± ± ± ± ± ± ± ± Element 1 Element 2 Element 3 (V1, A1) (V2, A2) (V3, A3) 2-24 IM WT310-02EN...
  • Page 55 Element 2 Element 3 (V1, A1) (V2, A2) (V3, A3) Note For details about the relationship between the wiring system and how measured and computed values are determined, see appendix 1, “Symbols and Determination of Measurement Functions.” Index 2-25 IM WT310-02EN...
  • Page 56 Wiring to the Current Input Terminals Connect the current input terminals between the R phase and T phase of the power cable. Cut the power cables at the positions where you want to insert the power meter. WT330 2-26 IM WT310-02EN...
  • Page 57 Therefore, in the voltage terminal connection described later, phase S is used as the reference to measure the line voltage between phase R and phase S and between phase T and phase S. This type of power measurement method is referred to as the two-wattmeter method. 2-27 IM WT310-02EN...
  • Page 58 For details on how to assemble and attach the safety terminal adapters, see section 2.5. You can avoid wiring mistakes by connecting red adapters to the R- and T-phase cables and black adapters to the S-phase cables. Black Black Safety terminal adapter 2-28 IM WT310-02EN...
  • Page 59 Voltage input terminals (V: VOLTAGE terminal) The wiring for voltage measurement is complete. The wiring for measuring the power of a three- phase, three-wire DUT is complete. Power supply Index WT330 ± ± SOURCE LOAD ± ± 2-29 IM WT310-02EN...
  • Page 60 The result of wiring the three-phase, three-wire system shown in the figure above is for the three- voltage, three-current method (3V3A) is shown below. Terminal block ± ± SOURCE LOAD ± ± ± ± ± ± ± 2-30 IM WT310-02EN...
  • Page 61 If the maximum current of the circuit under measurement exceeds the maximum range of the input elements, you can measure the current of the circuit under measurement by connecting an external current sensor to the external current sensor input connector. • WT310 and WT330 When the maximum current exceeds 20 Arms • WT310HC...
  • Page 62 ) between the sensor and the instrument to reduce the effects of common mode voltage. Take safety and error reduction into consideration when constructing external current sensor cables. WT310/WT310HC/WT330 Voltage input terminals ± LOAD External current sensor input connector Shunt-type current sensor 2-32 IM WT310-02EN...

  • Page 63: 2.10 Wiring The Circuit Under Measurement When Using Current Sensors

    WT310/WT310HC/WT330 Voltage input terminals ± LOAD External current sensor input connector Connecting the 96001 Clamp-on Probe When using the Yokogawa 96001 Clamp-on Probe, use the 758924 Conversion Adapter (optional accessory). 96001 (voltage output type) WT310/WT310HC 758924 EXT input terminal WT330...
  • Page 64 2.10 Wiring the Circuit under Measurement When Using Current Sensors Connecting to the WT310/WT310HC In the wiring examples that follow, the WT310/WT310HC input elements, voltage input terminals, and current input terminals are simplified as shown in the following figure. Voltage input...
  • Page 65 The following wiring example shows how to configure the wiring to connect to input element 1. To configure the wiring for other input elements, substitute the numbers in the figures with the appropriate element numbers. SOURCE LOAD Shunt-type current sensor Earth side OUT L OUT H ± ± Element 1 2-35 IM WT310-02EN...
  • Page 66 The wiring is connected to input elements 1, 2, and 3. SOURCE LOAD OUT H OUT L OUT H OUT L OUT H OUT L ± ± ± ± ± ± Element 1 Element 2 Element 3 2-36 IM WT310-02EN...
  • Page 67 ± ± ± Element 1 Element 2 Element 3 Note For details about the relationship between the wiring system and how measured and computed values are determined, see appendix 1, “Symbols and Determination of Measurement Functions.” Index 2-37 IM WT310-02EN...

  • Page 68: Voltage Measurement

    CT or a clamp-type sensor that outputs current to the current input terminal. • WT310 and WT330 When the maximum current exceeds 20 Arms • WT310HC...
  • Page 69 To measure the apparent power and power factor more accurately on an unbalanced three-phase circuit, we recommend that you use the three-voltage, three-current method (3V3A). When using the Yokogawa 751552 Clamp-on Probe, use the 758917 Measurement Lead and the 758921 Fork Terminal Adapter Set (optional accessory).
  • Page 70 2.11 Wiring the Circuit under Measurement When Using a Voltage or Current Transformer Connecting to the WT310/WT310HC In the wiring examples that follow, the WT310/WT310HC input elements, voltage input terminals, and current input terminals are simplified as shown in the following figure.
  • Page 71 CT with the pass-through CT or clamp- type current sensor. Pass-through CT Clamp-type current L CT sensor that outputs current ± ± ± ± ± ± Input element Input element Input element Index 2-41 IM WT310-02EN...
  • Page 72 VTs and CTs The wiring is connected to input elements 1 and 3. Measure the line voltage using S-phase power as the reference. SOURCE LOAD L CT L CT ± ± ± ± Element 1 Element 3 2-42 IM WT310-02EN...
  • Page 73 ± ± ± ± Element 1 Element 2 Element 3 Note For details about the relationship between the wiring system and how measured and computed values are determined, see appendix 1, “Symbols and Determination of Measurement Functions.” 2-43 IM WT310-02EN...

  • Page 74: Connecting To A Pc Via Usb (Installing Wtviewerfreeplus)

    PC via a different communication interface, see chapter 4 in the WTViewerFreePlus User’s Manual, IM 760121-02E. Connecting the WT310/WT310HC/WT330 to a PC via USB Use a USB cable to connect the USB port for PCs (type B connector) on the rear panel of the WT310/ WT310HC/WT330 to the PC. WT330...
  • Page 75 Click Allow or Yes to continue the installation. After the installation finishes, a new WTViewerFreePlus folder is added to the Start menu in Windows. You can open the folder by clicking the Start button, All Programs, YOKOGAWA, and then WTViewerFreePlus.
  • Page 76 2.12 Connecting to a PC via USB (Installing WTViewerFreePlus) For information on how to display measured data and change the WT310/WT310HC/WT330 settings from WTViewerFreePlus, see chapters 5 and 6 in the WTViewerFreePlus User’s Manual, IM 760121-02E. Example of a Window for Configuring the WT310/WT310HC/WT330 You can change the WT310/WT310HC/WT330 settings from a PC.

  • Page 77: Chapter 3 Common Operations

    Press ELEMENT to select which element to display. Each time you press ELEMENT, the input element changes in the order shown below. The WT310 and WT310HC only have one input element, so there is no input element selection. Index WT332 Σ...
  • Page 78 Press HOLD (ESC) while a setup menu is displayed to close the setup menu and return to the measurement data display. All setting changes that you have confirmed by pressing the SET key will be reflected in the settings. Execution Key Operations Press the HOLD, START, or STOP key to execute the specified feature. IM WT310-02EN...

  • Page 79: Entering Values

    Moving the Decimal Point Press SHIFT+▲ (.) to move the decimal point to the right. If you press SHIFT+▲ (.) when the decimal point is as far to the right as it can be, the decimal point will move to the leftmost possible position. Increases the number Moves the decimal point to the right Reduces the number Moves the digit that is being set to the right Index IM WT310-02EN...

  • Page 80: Initializing The Settings

    Initializing the Settings This section explains how to reset the WT310/WT310HC/WT330 settings to their factory default values. This feature is useful when you want to cancel all of the settings that you have entered or when you want to redo measurement from scratch.

  • Page 81: Operating The Wt310/Wt310Hc/Wt330

    Press The voltage range is confirmed, and each of the displays returns to showing measured values. The figures below show steps 1 to 3 in flowcharts. The User’s Manual, IM WT310-01EN, uses these types of flowcharts to explain procedures. When the Crest Factor Is Set to 3...
  • Page 82 Press The current range is confirmed, and each of the displays returns to showing measured values. The figures below show steps 1 to 3 in flowcharts. The User’s Manual, IM WT310-01EN, uses these types of flowcharts to explain procedures. WT310 Current Ranges...
  • Page 83 User’s Manual, IM WT310-01EN. Note Index In addition to the above operation, you can also change the current range without displaying the current range setup menu. For details, see section 2.3 in the User’s Manual, IM WT310-01EN. IM WT310-02EN...

  • Page 84: Configuring The Wiring System Settings (Only On The Wt330)

    For details, see section 2.2 in the User’s Manual, IMWT310-01EN. On the WT330, you can set a wiring system that matches the connected circuit under measurement. The wiring system on the WT310/WT310HC is a single-phase, two-wire system. If you set the displayed function to input element Σ, the average current and voltage of each of the wired input elements and the total power of each of the input elements are displayed in accordance with the selected wiring system.

  • Page 85: Displaying The Voltage, Current, And Active Power On The Wt310/Wt310Hc

    TIME Index The WT310/WT310HC moves the decimal point so that the measured value can be displayed using the number of digits available in display A. The unit prefix changes in accordance with the position of the decimal point. –3 •...

  • Page 86: Displaying Voltages, Currents, And Active Powers On The Wt330

    The display for input element 1 shows the line voltage between phases R-S (see page 2-28). • The display for input element 3 shows the line voltage between phases T-S (see page 2-28). • The display for input element Σ shows the average of the line voltage between phases R-S and T-S. This value does not have any physical meaning. IM WT310-02EN...

  • Page 87: Chapter 5 External I/0 (Option)

    CAUTION Only apply voltages that are within the range of 0 V to 5 V to the remote control input pins. Do not short or apply external voltages to the output pins. Doing so may damage the WT310/ WT310HC/WT330. Index...
  • Page 88 5.1 External I/O Connector Pin Arrangement and Pinout Connector Pin Arrangement WT310/WT310HC WT330 WT rear panel Cable connector WT rear panel Cable connector Pinout /DA4 (WT310/WT310HC) Pin No. Core Wire Color Signal Name Pin No. Core Wire Color Signal Name Gray (Black 2) Orange (Red 1)

  • Page 89: Controlling The Wt310/Wt310Hc/Wt330 Remotely

    Approx. 25 ms or more Approx. 25 ms or more EXT SINGLE Note If the period of the EXT SINGLE signal does not meet the conditions shown in the above figure, the signal may not be detected by the WT310/WT310HC/WT330. IM WT310-02EN...

  • Page 90: Producing D/A Output

    (you cannot select an element for 1 The number of channels varies depending on the specific option that is installed. • /DA4 option on the WT310/WT310HC: 4 channels • /DA12 option on the WT330: 12 channels 2 When you press SET in step 11, the output channel shown in display B changes to the next channel.

  • Page 91: Output Format

    4. Note If you operate the WT310/WT310HC/WT330 frequently to configure settings such as the D/A output items and rated integration time, you can connect the WT310/WT310HC/WT330 to a PC and use WTViewerFreePlus to easily configure settings from the PC. Explanation...
  • Page 92 MATH (integration), ---- (0 V D/A output; no element is specified) * For more information about positive and negative ampere hours, see page 5-4 of the User’s Manual, IM WT310-01EN. Elements (Area B in step 10 in the procedural explanation for setting the D/A output...
  • Page 93 Note • When the MAX hold feature (see section 4.6 in the User’s Manual, IM WT310-01EN) is enabled, the maximum held values (MAX values) for the following items are displayed. The maximum held values (MAX values) are also output in D/A output.
  • Page 94 For Upk and Ipk, ±5 V represents the application of 3 times the rated range value (6 times the rated range value when the crest factor is 6). • When the selected output function is “----” or there is no numerical data, the output is 0 V. IM WT310-02EN...
  • Page 95 When the measured power value is 600 W, the output is 600 W/1500 W × 5V = 2.0 V. 1 For information about the power range of wiring unit Σ, see the table of Σ function expressions on the second page of the appendix in the User’s Manual, IM WT310-01EN (PDF). This table shows the expressions that the WT330 uses to internally calculate the measured values. This table also shows how to think about wiring unit measurement ranges. In this example, PΣ in the table...

  • Page 96: Chapter 6 Troubleshooting, Maintenance, And Inspection

    Problems and Solutions Refer To Nothing appears on the 7-segment LED display when you turn on the power. Securely connect the power cord to the WT310/WT310HC/WT330 and to the power outlet. Set the supply voltage and frequency to within the permitted range.

  • Page 97: Error Code Descriptions And Corrective Actions

    The EEPROM may be corrupted. ― Servicing is required. The currently installed modules and the setup data Servicing is required. ― conflict with each other. The setup data has been initialized. Communication Interface User’s Manual, IM WT310-17EN User’s Manual, IM WT310-01EN IM WT310-02EN...

  • Page 98: Recommended Part Replacement

    Recommended Part Replacement YOKOGAWA guarantees the WT310/WT310HC/WT330 for the period and under the conditions of the product warranty. The warranty does not cover the following expendable items. The replacement period for expendable items varies depending on the conditions of use. Refer to the table below as a general guideline.

  • Page 99: Calibration And Adjustment

    Calibration and Adjustment For calibration and adjustment, contact your nearest YOKOGAWA dealer. IM WT310-02EN...

  • Page 100: Chapter 7 Specifications

    • WT310/WT332/WT333: 0.5 A, 1 A, 2 A, 5 A, 10 A, 20 A • WT310 Only: 5 mA, 10 mA, 20 mA, 50 mA, 100 mA, 200 mA • WT310HC: 1 A, 2 A, 5 A, 10 A, 20 A, 40 A •...
  • Page 101 (1 period, for 20 ms) Current • Direct input • WT310/WT332/WT333 Crest factor 3: 0.5 A, 1 A, 2 A, 5 A, 10 A, 20 A Crest factor 6: 0.25 A, 0.5 A, 1 A, 2.5 A, 5 A, 10 A Peak value of 450 A or RMS value of 300 A, whichever is less •...
  • Page 102 0.01% of range or more. f is frequency of input signal in kHz. • 15 V, 30 V, 60 V, 150 V, 300 V, 600 V ranges, 0.5 A, 1 A, 2 A, 5 A, 10 A, 20 A ranges of WT310/...

  • Page 103: Measurement Items

    PLL synchronization source A Hz frequency of the current set to be the PLL synchronization source Uthd THD V % total harmonic distortion of voltage Ithd THD A % total harmonic distortion of current Element Select the input element or Σ on the WT332/WT333. Displays the display item of the selected element. IM WT310-02EN...

  • Page 104: Accuracy

    Add the following value to the above accuracy (reference value). The effective input range is within ±300% of range (within ±600% for crest factor 6) Voltage input: 1.5 × √(15/range) % of range Direct current input range: WT310 (5mA/10mA/20mA/50mA/100mA/200mA range): 3 ×√(0.005/range) % of range WT310 (0.5A/1A/2A/5A/10A/20A range) and WT332/WT333 direct current input: 3 ×√(0.5/ range) % of range WT310HC direct current input: 3 ×√(1/range) % of range External current sensor input range: /EX1 Option: 3 ×√(2.5/range) % of range /EX2 Option: 3 ×√(0.05/range) % of range IM WT310-02EN...
  • Page 105 Add ±0.03% of reading/°C within the range of 5 to 18°C or 28 to 40°C. Accuracy when the crest Accuracy obtained by doubling the measurement range error for the accuracy when the crest factor factor is set to 6 is set to 3. IM WT310-02EN...
  • Page 106 • Guaranteed accuracy ranges for frequency, voltage, and current All accuracy figures for 0.5 to 10 Hz are reference values. The power accuracy figures for DC, 10 Hz to 45 Hz, and 400 Hz to 100 kHz when the current exceeds 20 A are reference values. IM WT310-02EN...
  • Page 107 (influence from the power factor when λ= 0%/100)}|] ± 1 digit when voltage and current are at the measurement range rated input −1 −1 Accuracy of phase ±[|f – cos (λ/1.0002)| + sin {(influence from the power factor differenceφ when λ= 0%)/100}] deg ± 1 digit when voltage and current are at the measurement range rated input IM WT310-02EN...

  • Page 108: Functions

    Select OFF or ON (cutoff frequency at 500 Hz). Peak measurement Measures the peak (max, min) value of voltage, current, or power from the instantaneous voltage, instantaneous current, or instantaneous power that is sampled. Zero-level compensation Removes the internal offset of the WT310/WT310HC/WT332/WT333. IM WT310-02EN...
  • Page 109 Σ • On the WT310/WT310HC/WT332/WT333, S, Q, λ, and Φ are derived through the computation of the measured values of voltage, current, and active power. Therefore, for distorted signal input, the value obtained on the WT310/WT310HC/WT332/ WT333 may differ from that obtained on other instruments that use a different method. • If the voltage or current is less than 0.5% (less than or equal to 1% if the crest factor is set to 6) of the rated range, zero is displayed for S or Q, and error is displayed for λ and Φ.
  • Page 110 DC, lower limit frequency determined by the data update interval to 45 kHz When the measurement mode is DC: DC to 45 kHz Timer accuracy ±0.02% Remote control Start, stop, and reset operations are available using an external remote signal. (applies to products with the /DA4 or /DA12 option) 7-11 IM WT310-02EN...
  • Page 111 If the amplitude of the high frequency component is large, influence of approximately 1% may appear in certain harmonics. Because the influence depends on the size of the frequency component, if the frequency component is small with respect to the range rating, the influence is also negligible. 7-12 IM WT310-02EN...
  • Page 112 Phase angle of the 2nd –180.0 to 180.0 –180.0 to 180.0 harmonic and higher harmonics of current with respect to the fundamental current Unit symbols m, k, M, V, A, W, VA, var, °, Hz, h±, TIME, % 7-13 IM WT310-02EN...

  • Page 113: External Current Sensor Input (/Ex1 And /Ex2 Options)

    Set for each channel. U, I, P, S, Q, λ, Φ, fU, fI, Upk, Ipk, WP, WP±, q, q±, MATH Accuracy ±(accuracy of each measurement item + 0.2% of FS) (FS = 5 V) D/A conversion resolution 16 bits Minimum load 100 kΩ Update interval Same as the data update interval. Temperature coefficient ±0.05%/°C of FS 7-14 IM WT310-02EN...

  • Page 114: Remote Control Input/Output Signal (/Da4, /Da12 Options)

    USBTMC-USB488 (USB Test and Measurement Class Ver. 1.0) PC system requirements A PC with a USB port, running the English or Japanese version of Windows 7 (32 bit/64bit), Windows Vista (32 bit), or Windows XP (32 bit, SP2 or later) 7-15 IM WT310-02EN...

  • Page 115: Ethernet Interface(/C7 Option)

    7.12 Safety Terminal Adapter Item Specifications Maximum allowable current 36 A Dielectric strength 1000 V CATIII Contact resistance 10 mΩ or less Contact section Nickel plating on brass or bronze Insulator Polyamide Maximum core wire diameter 1.8 mm Maximum insulation diameter 3.9 mm 7-16 IM WT310-02EN...

  • Page 116: Safety Terminal Adapter

    Maximum power WT310, WT310HC: 50 VA, WT332/WT333: 70 VA consumption External dimensions WT310, WT310HC: Approx. 213 (W) × 88 (H) × 379 (D) mm (excluding protrusions) WT332/WT333: Approx. 213 (W) × 132 (H) × 379 (D) mm Weight WT310, WT310HC: Approx. 3 kg WT332/WT333: Approx.

  • Page 117: General Specifications

    7.13 General Specifications Applies to products with CE marks. For information on other products, contact your nearest YOKOGAWA dealer. The overvoltage category (installation category) is a value used to define the transient overvoltage condition and includes the rated impulse withstand voltage. CAT II applies to electrical equipment that is powered through a fixed installation, such as a wall outlet wired to a distribution board.

  • Page 118: External Dimensions

    ±1 Mounting surface ±1 Index ±1 Mounting surface 482.6 ±1 EIA rack mount dimensions ±1 Mounting surface 482.6 ±1 ±1 Mounting surface Unless otherwise specified, tolerances are ±3% (however, tolerances are ±0.3 mm when below 10 mm). 7-19 IM WT310-02EN...
  • Page 119 ±1 ±1 Mounting surface ±1 ±1 Mounting surface EIA rack mount dimensions 482.6 ±1 ±1 Mounting surface 482.6 ±1 ±1 Mounting surface Unless otherwise specified, tolerances are ±3% (however, tolerances are ±0.3 mm when below 10 mm). 7-20 IM WT310-02EN...
  • Page 120 Because the current flowing through the circuit under measurement is i , only i reduces measurement accuracy. The input resistance of the voltage measurement circuit of the WT310/WT310HC/WT330 is approximately 2 MΩ. If the input voltage is 600 V, i is approximately 0.3 mA (600 V/2 MΩ). If the load current i is 3 A or more (the load resistance is 200 Ω or less), the effect of i...

  • Page 121: Appendix 1 How To Make Accurate Measurements

    Effects of Stray Capacitance The effects of stray capacitance on measurement accuracy can be minimized by connecting the WT310/WT310HC/WT330 current input terminal to the side of the power supply (SOURCE) that is closest to its earth potential. The internal structure of the WT310/WT310HC/WT330 is explained below.
  • Page 122 If you connect the WT310/WT310HC/WT330 current input terminal to the side of the power supply (SOURCE) that is close to its earth potential, the WT310/WT310HC/WT330 current measurement circuit positive and negative terminals are close to the earth potential, so V...

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