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App-1

IM WT310-02EN

Appendix

1

2

3

4

5

6

7

App

Index

Appendix 1  How to Make Accurate Measurements

Effects of Power Loss

By wiring a circuit to match the load, you can minimize the effects of power loss on measurement 
accuracy. We will discuss the wiring of the DC power supply (SOURCE) and a load resistance (LOAD) 
below.

When the Measured Current Is Relatively Large

Connect the voltage measurement circuit between the current measurement circuit and the load. 
The current measurement circuit measures the sum of i

L

 and i

V

. i

L

 is the current flowing through the 

load of the circuit under measurement, and i

V

 is the current flowing through the voltage measurement 

circuit. Because the current flowing through the circuit under measurement is i

L

, only i

V

 reduces 

measurement accuracy. The input resistance of the voltage measurement circuit of the WT300 series 

is approximately 2 MΩ. If the input voltage is 600 V, i

V

 is approximately 0.3 mA (600 V/2 MΩ). If the 

load current i

L

 is 3 A or more (the load resistance is 200 Ω or less), the effect of i

V

 on the measurement 

accuracy is 0.01% or less. If the input voltage is 100 V and the current is 5 A, i

V

 = 0.05 mA (100 V/2 

MΩ), so the effect of i

V

 on the measurement accuracy is 0.001% (0.05 mA/5 A).

 

SOURCE

LOAD

WT300 series

V

C

i

V

i

L

LOAD

SOURCE

U

I

C

V

±

±

±

±

As a reference, the relationships between the voltages and currents that produce effects of 0.01%, 
0.001%, and 0.0001% are shown in the figure below.

 

600

400

200

0

Measured current (A)

Measured voltage (V)

0.01% effect

0  5  10 15 20 25 30 35 40

0.001% effect

0.0001% effect

Smaller effect

3

When the Measured Current Is Relatively Small

Connect the current measurement circuit between the voltage measurement circuit and the load. 
In this case, the voltage measurement circuit measures the sum of e

L

 and e

I

. e

L

 is the load voltage, 

and e

I

 is the voltage drop across the current measurement circuit. Only e

I

 reduces measurement 

accuracy. For example, the input resistance of the current measurement circuit of the WT332/WT333 

is approximately 6 mΩ. If the load resistance is 600 Ω, the effect on the measurement accuracy is 
approximately 0.001% (6 mΩ/600 Ω). For the input resistances of the WT310 and WT310HC, see 

chapter 7.

 

SOURCE

LOAD

V

C

WT300 series

e

L

e

I

SOURCE

LOAD

U

I

C

V

±

±

±

±

Appendix

Содержание WT300

Страница 1: ...User s Manual WT310 WT310HC WT332 WT333 Digital Power Meter Getting Started Guide IM WT310 02EN 3rd Edition ...

Страница 2: ...asing 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 website http tmi yokogawa com PIM 103 04E ...

Страница 3: ... in the manual numbers are the language codes Contact information of Yokogawa offices worldwide is provided on the following sheet Document No Description PIM 113 01Z2 List of worldwide contacts Notes The contents of this manual are subject to change without prior notice as a result of continuing improvements to the instrument s performance and functionality The figures given in this manual may di...

Страница 4: ...wer cord1 D UL CSA Standard power cord Part No A1006WD Maximum rated voltage 125 V F VDE Standard power cord Part No A1009WD Maximum rated voltage 250 V Q BS Standard power cord Part No A1054WD Maximum rated voltage 250 V R AS Standard power cord Part No A1024WD Maximum rated voltage 250 V H GB Standard power cord Part No A1064WD Maximum rated voltage 250 V N NBR Standard power cord Part No A1088W...

Страница 5: ... is included 1 GB Standard A1064WD H NBR Standard A1088WD N Printed manuals Manual CD 1 Make sure that the attached power cord meets the designated standards of the country and area that you are using it in 2 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...

Страница 6: ...Japanese The PDFs of the Japanese user s manuals are also included on the CD Installer for the WTViewerFreePlus Application Software For the WT300 Series WTViewerFreePlus_Installer exe WTViewerFreePlus folder YKMUSB folder PDF of the Manual for the WTViewerFreePlus Application Software These manuals are in the Manuals folder English File Name Manual Title Manual No WTViewerFreePlus User s Manual p...

Страница 7: ...V 1 758931 1 Two pieces in one set Rated voltage 1000 V 12 Alligator clip adapter set 758922 1 Two pieces in one set For use with measurement lead 758917 Rated voltage 300 V 1 758929 1 Two pieces in one set For use with measurement lead 758917 Rated voltage 1000 V 1 Fork terminal adapter set 758921 1 Two pieces in one set For use with measurement lead 758917 Rated voltage 1000 V 1 Rated current 25...

Страница 8: ...ent that can measure parameters such as voltage current and power Do not use this instrument for anything other than its intended purpose The following symbols are used on this instrument Warning handle with care Refer to the user s manual or service manual This symbol appears on dangerous locations on the instrument which require special instructions for proper handling or use The same symbol app...

Страница 9: ... a properly grounded three prong outlet Do Not Impair the Protective Grounding Never cut off the internal or external protective earth wire or disconnect the wiring of the protective earth terminal Doing so may result in electric shock or damage to the instrument Do Not Use When the Protection Functions Are Defective Before using this instrument check that the protection functions such as the prot...

Страница 10: ...cables are connected firmly to the current input terminals There are no problems with the current input terminals and the crimping terminals such as the presence of foreign substances During measurement never touch the terminals and the connected cables when the item under measurement is on check that There no problems with the input terminals and the crimping terminals such as the presence of for...

Страница 11: ...g products in the EU contact your local Yokogawa Europe B V office Do not dispose in domestic household waste EU Battery Directive EU Battery Directive This directive is valid only in the EU Batteries are included in this product This marking indicates they shall be sorted out and collected as ordained in the EU battery directive Battery type Lithium battery You cannot replace batteries by yoursel...

Страница 12: ...al the symbol is used in conjunction with the word WARNING or CAUTION WARNING Calls attention to actions or conditions that could cause serious or fatal injury to the user and precautions that can be taken to prevent such occurrences CAUTION Calls attentions to actions or conditions that could cause light injury to the user or damage to the instrument or user s data and precautions that can be tak...

Страница 13: ...s and then press SETUP UTILITY A menu appears in display B 2 Use or to select StorE Pressing either key cycles through 9 menu items 3 Press SET to confirm the selection of StorE The StorE function menu that you selected in step 2 appears in display C 4 Use or to select oFF or on Pressing either key cycles through 3 menu items 5 Press SET to confirm the selection of oFF The selected or set item is ...

Страница 14: ...tions Perform key operations Initialize settings User s Manual Chapter 2 Set the Measurement Conditions Measurement conditions User s Manual Section 4 1 Section 4 2 Section 4 3 Section 4 4 Section 4 5 Chapter 5 Chapter 6 Display Measured Computed Results Voltage current and active power Apparent power reactive power and power factor Phase angle and frequency Peak value Crest factor etc Integrated ...

Страница 15: ...easuring a Single phase Device 2 14 2 8 Guide for Selecting the Method Used to Measure the Power 2 15 2 9 Wiring the Circuit under Measurement for Direct Input 2 16 2 10 Wiring the Circuit under Measurement When Using Current Sensors 2 31 2 11 Wiring the Circuit under Measurement When Using a Voltage or Current Transformer 2 38 2 12 Connecting to a PC via USB Installing WTViewerFreePlus 2 44 Chapt...

Страница 16: ...y 7 5 7 4 Functions 7 9 7 5 External Current Sensor Input EX1 and EX2 options 7 14 7 6 D A Output DA4 DA12 Options 7 14 7 7 Remote Control Input Output Signal DA4 DA12 Options 7 15 7 8 GP IB Interface Standard on C1 7 15 7 9 Serial RS 232 Interface Standard on C2 7 15 7 10 USB PC Interface 7 15 7 11 Ethernet Interface C7 Option 7 16 7 12 Safety Terminal Adapter 7 16 7 13 General Specifications 7 1...

Страница 17: ...ce Communication Interface User s Manual External I O connector For connecting D A output and remote control cables chapter 5 For connecting voltage measurement cables sections 2 8 to 2 11 Voltage input terminals Current input terminal For connecting current measurement cables sections 2 8 2 9 and 2 11 External current sensor input terminal For connecting cables from an external current sensor sec...

Страница 18: ...1 2 IM WT310 02EN Top Panel Vent holes section 2 2 Inlet holes section 2 2 There are also inlet holes on the bottom panel 1 1 Front Panel Rear Panel and Top Panel ...

Страница 19: ...tion Interface User s Manual External I O connector For connecting D A output and remote control cables chapter 5 For connecting voltage measurement cables sections 2 8 to 2 11 Voltage input terminals Current input terminal For connecting current measurement cables sections 2 8 2 9 and 2 11 External current sensor input terminal For connecting cables from an external current sensor section 2 10 Et...

Страница 20: ...1 4 IM WT310 02EN Top Panel Vent holes section 2 2 Inlet holes section 2 2 There are also inlet holes on the bottom panel 1 1 Front Panel Rear Panel and Top Panel ...

Страница 21: ...LINE Lights when the line filter is enabled Frequency filter indicator FILTER FREQ Lights when the frequency filter is enabled Storage indicator STORE When you start storage this indicator blinks at the pace at which storage is taking place Remote indicator REMOTE Lights when the WT310 WT310HC is in remote mode Harmonic measurement display indicator HARMONICS Lights when the harmonic measurement d...

Страница 22: ...tor FILTER FREQ Lights when the frequency filter is enabled Storage indicator STORE When you start storage this indicator blinks at the pace at which storage is taking place Remote indicator REMOTE Lights when the WT332 WT333 is in remote mode Harmonic measurement display indicator HARMONICS Lights when the harmonic measurement display is on Key protection indicator KEY PROTECT Lights when the key...

Страница 23: ...nstrument 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 0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T Lowercase c Lowercase h U V W X Y Z exponentiation ...

Страница 24: ...ode VOLTAGE Key Displays the voltage range setting menu The AUTO indicator lights when the range is set to AUTO CURRENT Key Displays the current range setting menu The AUTO indicator lights when the range is set to AUTO SHIFT VOLTAGE MODE Key Switches the measurement mode Wiring System WIRING Key Only on the WT332 WT333 Select the wiring system that corresponds to the wiring system you are using t...

Страница 25: ...held press SINGLE to measure data only once at the set data update interval and then update and hold the displayed values General Purpose Keys and Keys Select features and set values SHIFT Key Moves the digit that is being set in a value to the right or from the farthest right position back to the farthest left position SHIFT Key Moves the decimal point to the right or from the farthest right posi...

Страница 26: ...time SHIFT STOP Key RESET Resets the integrated value and the elapsed integration time Communication Interface INTERFACE Key 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...

Страница 27: ... D A output settings SHIFT SAVE LOAD HARMONICS Key Displays a setting menu for turning the harmonic measurement display on and off setting the PLL source etc SHIFT Key When you press the SHIFT key once an indicator illuminates and you can access the features that are written in purple below each key Pressing the key again disables the shifted state Holding the key for at least two seconds enables ...

Страница 28: ...ellow Greater than 130 of the rated range and not more than 140 condition for raising the auto range 2 Cyan 30 or less of the rated range condition for reducing the auto range If the range is already at the minimum measurement range this indicator will not light even when values are 30 or less of the rated range 1 On the WT310HC the current is determined to be overrange when it exceeds 110 of the ...

Страница 29: ... 02EN Component Names and Functions 1 2 3 4 5 6 7 App Index Error Displayed in cases such as when a measured value is outside of its determined range 1 5 Auto Range Overrange and Error Indications During Measurement ...

Страница 30: ...nternal memory Numeric data storage Recorder Numeric data Setup parameters PC Printer Integration start Integration stop Hold single USB interface GP IB interface RS 232 interface Ethernet interface optional D A output option Measured values are transmitted as DC voltages WT300 series The WT300 series is standard equipped with a GP IB or RS 232 interface whichever you choose ...

Страница 31: ...nearest YOKOGAWA dealer Do Not Damage the Power Cord Nothing should be placed on top of the power cord The power cord should also be kept away from any heat sources When removing the plug from the power outlet do not pull on the cord Pull from the plug If the power cord is damaged purchase a replacement with the same part number as the one indicated on page iii General Handling Precautions Do Not ...

Страница 32: ...n the following figure or use both hands to hold the instrument firmly WT310 WT310HC WT332 WT333 When Cleaning the Instrument 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 ma...

Страница 33: ...t temperature 5 to 40 C Ambient humidity 20 to 80 RH No condensation Do Not Install the Instrument in the Following Places Outdoors In direct sunlight or near heat sources Where the instrument is exposed to water or other liquids Where an excessive amount of soot steam dust or corrosive gas is present Near strong magnetic field sources Near high voltage equipment or power lines Where the level of ...

Страница 34: ... To rotate the handle first pull the handle s rotary axis out approximately 2 mm to 3 mm on both the left and right sides of the instrument and then rotate it slowly to one of its stop positions 1 2 3 4 5 6 7 8 1 3 Rotating base Pull this out approximately 2 mm to 3 mm and rotate the handle Handle stop positions We recommend that you use positions 1 3 5 and 8 Do not place a heavy load on the WT310...

Страница 35: ...move the handle from the instrument WT310 WT310HC Rotate the handle to position 8 see the figure on the previous page and then pull out the rotating base of the handle by approximately 10 mm on both sides WT332 WT333 Remove the handle attachment section cover and remove the handle attachment screws Rotating base To remove the handle rotate the handle to position 8 and then pull out the rotating ba...

Страница 36: ...able and you cannot ground the instrument do not use the instrument Connecting the Power Cord 1 Check that the instrument s power switch is off 2 Connect the power cord plug to the power inlet on the rear panel of the instrument 3 Connect the other end of the cord to an outlet that meets the following conditions Use a grounded three prong outlet Item Specification Rated supply voltage 100 VAC to 1...

Страница 37: ... seconds before you turn it on again When the Power on Operation Does Not Finish Normally If the instrument does not operate as described above when the power switch is turned on turn the power switch off and then Check that the power cord is securely connected Check that the correct voltage is coming to the power outlet section 2 3 Connecting the Power Supply After checking the above try turning ...

Страница 38: ...battery When the lithium battery voltage falls below a specified value you will no longer be able to store setup parameters and error code 901 will appear on the screen when you turn on the power 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 YOKOG...

Страница 39: ... terminals are electrically connected inside the instrument When connecting a measurement cable from an external current sensor to an external current sensor input terminal remove the cables connected to the current input terminals Also when the voltage of the circuit under measurement is being applied to the external current sensor input terminals do not touch the current input terminals Doing so...

Страница 40: ...0 A whichever is less WT310 When the crest factor is 3 5 mA to 200 mA When the crest factor is 6 2 5 mA to 100 mA Peak value of 150 A or rms value of 100 A whichever is less WT310HC When the crest factor is 3 1 A to 40 A When the crest factor is 6 0 5 A to 20 A Peak value of 450 A or rms value of 300 A whichever is less External current sensor input Peak value less than or equal to 10 times the ra...

Страница 41: ...or greater Attaching a measurement cable to this product may cause radio interference in which case the user will be required to correct the interference Note If you are measuring large currents or voltages or currents that contain high frequency components take special care in dealing with mutual interference and noise when you wire the cables Keep measurement cables as short as possible to minim...

Страница 42: ... covering from the end of the cable and pass the cable through the internal insulator Cable Internal insulator Attachable cable Covering max diameter 3 9 mm Core wire max diameter 1 8 mm 10 mm 2 Insert the tip of the cable into the plug Fasten the cable in place using the hexagonal wrench Insert the hexagonal wrench into the plug and tighten Plug Hexagonal wrench Cable tip 3 Insert the plug into t...

Страница 43: ...ls Wiring to a Current Input Terminal Use the clamp on probes sold separately as shown below 96030 96031 96001 voltage output type 751552 current output type 758917 758921 758924 Current under measurement Connecting a clamp on probe WT310 WT310HC WT332 WT333 EXT input terminal Current input terminals Current input terminals EXT input terminal 96001 terminal When you are connecting to the 96030 960...

Страница 44: ...stray capacitance on measurement accuracy by connecting the instrument s current input terminal to the side that is closest to the earth potential of the power supply SOURCE SOURCE LOAD U I C V LOAD U V I C SOURCE Easily affected Not easily affected SOURCE LOAD U I C V SOURCE LOAD U I C V Effects of the Measured Voltage and Current Amplitudes SOURCE LOAD U I C V LOAD SOURCE U I C V When the measur...

Страница 45: ...ring Direct input is not possible section 2 11 Direct input Voltage transformer VT Current Measurement Methods When the Voltage Is 600 V or Less When the Current Is 20 A or Less When the Current Exceeds 20 A When the Current Is 40 A or Less When the Current Exceeds 40 A When the Voltage Exceeds 600 V section 2 9 Current wiring Product name Direct input is not possible Shunt type current sensors ca...

Страница 46: ...en tighten firmly with the terminal knob 3 1 2 1 6 7 Unit mm Current input terminals Current input terminals WT310 WT310HC WT332 WT333 WARNING When the voltage of the circuit under measurement is being applied to the current input terminals do not touch the external current sensor input terminal Doing so is dangerous because the terminals are electrically connected inside the instrument When conne...

Страница 47: ...to insert the new stopper into the terminal base and hold it in place Hold the stopper with tweezers and insert it into the terminal base Wrap adhesive tape around a flathead screwdriver so that the adhesive side of the tape faces outward then attach the stopper to the adhesive tape Flathead screwdriver Tweezers Adhesive tape Stopper shaft Center hole 4 Align the shaft of the stopper with the hole...

Страница 48: ...rminal C CURRENT terminal CAUTION The thick lines on the wiring diagrams are the parts where the current flows Use wires that are suitable for the current levels Wiring Patterns When you are wiring a single phase device there are the four patterns of terminal wiring positions shown in the following figures for wiring the voltage input and current input terminals To select which pattern to use see ...

Страница 49: ...nerally 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 Wiring to the Current Input Terminals Connect the current input terminals in series with the DUT along one of the power cables between the DU...

Страница 50: ...inals C CURRENT terminal Round crimped terminal Power supply DUT The wiring for current measurement is complete SOURCE LOAD I C Wiring to the Voltage Input Terminals Connect the voltage input terminals in parallel with the DUT 3 Connect the voltage measurement cables to the power supply terminals of the DUT Use cables that meet the following conditions Sufficient dielectric strength for the voltag...

Страница 51: ...ter Red Black 5 Connect the safety terminal adapters to the WT310 voltage input terminals Red adapter Connect to the VOLTAGE voltage input terminal Black adapter Connect to the voltage input terminal Pay attention to the terminal polarities so that you don t attach the cables to terminals V and with the wrong polarities Voltage input terminals V VOLTAGE terminal V The wiring for voltage measuremen...

Страница 52: ...ect 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 2 9 Wiring the Circuit under Measurement for Direct Input ...

Страница 53: ... CURRENT terminal WT332 WT333 Note The thick lines on the wiring diagrams are the parts where the current flows Use wires that are suitable for the current levels Wiring Examples of Single Phase Two Wire Systems 1P2W 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 wit...

Страница 54: ... input elements 1 and 3 Measure the line voltage using S phase power as the reference SOURCE LOAD I1 C I3 C U1 V U3 V R S T SOURCE LOAD Element 1 V1 A1 R S T Element 3 V3 A3 C V C V Wiring Example of a Three Phase Four Wire System 3P4W Applies to the WT333 The wiring is connected to input elements 1 2 and 3 SOURCE LOAD I1 C I3 C U1 V U3 V R N S T SOURCE Element 1 V1 A1 R S T N Element 2 V2 A2 LOAD...

Страница 55: ...input elements 1 2 and 3 SOURCE LOAD I1 C I3 C U1 V U3 V R N S T SOURCE Element 1 V1 A1 R S T Element 2 V2 A2 LOAD Element 3 V3 A3 U2 V I2 C C V C V C V 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 9 Wiring the Circuit under Measurement for Direct Input ...

Страница 56: ...phase two wire DUT on page 2 19 is a useful reference for thinking about the voltage of each phase and the current wiring Order of Connection 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 WT332 WT333 current input terminals first and then to the voltage input t...

Страница 57: ...he cables to terminals C and with the wrong polarities T S R C Current input terminals C CURRENT terminal R T 1 3 R S T Power supply DUT The wiring for current measurement is complete T S R SOURCE LOAD I1 C I3 C R S T 1 3 R S T Note Why You Do Not Have to Connect the WT332 WT333 Current Input Terminals to the S Phase Cable In a three phase three wire wiring system there is no neutral line This mea...

Страница 58: ...ength for the voltage of the circuit under measurement Of a size to which the 758931 Safety Terminal Adapter can be attached Covering max diameter 3 9 mm Core wire max diameter 1 8 mm T S R Voltage measurement cables 1 3 R S T 4 Attach 758931 Safety Terminal Adapters to the voltage measurement cables For details on how to assemble and attach the safety terminal adapters see section 2 5 You can avo...

Страница 59: ...ters Connect to the voltage input terminals of elements 1 and 3 Pay attention to the terminal polarities so that you don t attach the cables to terminals VOLTAGE and with the wrong polarities T S R V Voltage input terminals V VOLTAGE terminal 1 3 R S T R S T S The wiring for voltage measurement is complete The wiring for measuring the power of a three phase three wire DUT is complete T S R SOURCE ...

Страница 60: ... wire system Wiring to the Current Input Terminals In the aforementioned steps 1 and 2 connect the current input terminals of element 2 to the S phase power cable Wiring to the Voltage Input Terminals In the aforementioned steps 3 to 5 connect the voltage input terminals of element 2 so as to measure the line voltage between phase R and phase T The result of wiring the three phase three wire syste...

Страница 61: ...rminals Voltage Input Terminals The terminals are safety banana jacks female that are 4 mm in diameter Only insert a safety terminal whose conductive parts are not exposed into a voltage input terminal If you are using the included 758931 Safety Terminal Adapter see section 2 6 External Current Sensor Input Terminal The terminal is an isolated BNC connector Connect an external current sensor cable...

Страница 62: ...t sensor cable Connect the shielded wire of the external current sensor cable to the L side of the shunt output terminal OUT Minimize the area of the space between the wires connecting the current sensor to the external current sensor cable This reduces the effects of the lines of magnetic force which are caused by the measurement current and the external noise that enter the space Shunt type curr...

Страница 63: ... large In this case use an isolation sensor CT DC CT or clamp to perform measurements Clamp type current sensor External current sensor input terminal LOAD V Voltage input terminals WT300 series 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 758924 WT310 WT310HC WT332 WT333 EXT input te...

Страница 64: ... to connect to the WT310 WT310HC SOURCE LOAD Earth side OUT L OUT H Shunt type current sensor SOURCE LOAD Earth side Clamp type current sensor that outputs voltage C V EXT C V EXT When You Are Using a Clamp type Current Sensor That Outputs Voltage When You Are Using a Shunt Type Current Sensor When you use a shunt type current sensor in the wiring configuration shown at the bottom of page 2 21 the...

Страница 65: ...ent sensor that outputs voltage substitute the shunt type current sensor with the clamp type current sensor Shunt type current sensor I OUT L OUT H Input element Input element Clamp type current sensor that outputs voltage EXT C V EXT C V Wiring Example of a Single Phase Two Wire System 1P2W with a Shunt Type Current Sensor The following wiring example shows how to configure the wiring to connect ...

Страница 66: ...ing is connected to input elements 1 and 3 Measure the line voltage using S phase power as the reference SOURCE LOAD R S T OUT L OUT H OUT L OUT H Element 3 Element 1 EXT EXT C V C V Wiring Example of a Three Phase Four Wire System 3P4W with Shunt Type Current Sensors Model Applies to the WT333 The wiring is connected to input elements 1 2 and 3 SOURCE LOAD OUT L OUT H R S T N OUT L OUT H Element ...

Страница 67: ...wiring is connected to input elements 1 2 and 3 SOURCE LOAD R S T OUT L OUT H OUT L OUT H Element 3 Element 1 Element 2 OUT L OUT H EXT EXT EXT C V C V C V 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 10 Wiring the Circuit under Measurement When Using Current...

Страница 68: ...whose conductive parts are not exposed into a voltage input terminal If you are using the included 758931 Safety Terminal Adapter see section 2 6 Current Input Terminals The terminals are binding posts and the screws are M6 Either wind a wire around a screw or pass a crimped terminal through the screw axis and then tighten firmly with the terminal knob For the dimensions of the terminal parts see ...

Страница 69: ...s of the VT or CT affect the measured data For safety reasons the common terminals of the secondary side of the VT and CT are grounded in the wiring diagrams in this section However the necessity of grounding and the grounding location ground near the VT or CT or ground near the power meter vary depending on the item under measurement To measure the apparent power and power factor more accurately ...

Страница 70: ...nals Wiring Example The following figures show how to connect to the WT310 WT310HC SOURCE LOAD L CT VT V v SOURCE LOAD VT V v C V Pass through CT C V VT and pass through CT VT and CT SOURCE LOAD VT V v C V Clamp type current sensor that outputs current VT and Clamp type Current Sensor That Outputs Current Note Some CTs including through types require load resistance and power supplies Check your C...

Страница 71: ...nput element C V Voltage input terminals Current input terminals WT332 WT333 Also the wiring examples are for when a CT is connected When connecting a pass through CT or a clamp type current sensor that outputs current substitute the CT with the pass through CT or clamp type current sensor Clamp type current sensor that outputs current C V L CT C V Input element Input element Pass through CT C V I...

Страница 72: ...Element 1 Element 1 C V C V Wiring Example of a Single Phase Three Wire System 1P3W with VTs and CTs The wiring is connected to input elements 1 and 3 SOURCE L CT VT V v LOAD L CT VT V v N Element 1 Element 3 C V C V Wiring Example of a Three Phase Three Wire System 3P3W with VTs and CTs The wiring is connected to input elements 1 and 3 Measure the line voltage using S phase power as the reference...

Страница 73: ... V Wiring Example With the Three Voltage Three Current Method 3V3A and VTs and CTs Model Applies to the WT333 The wiring is connected to input elements 1 2 and 3 SOURCE LOAD S T R L CT VT V v L CT VT V v L CT VT V v Element 1 Element 2 Element 3 C V C V C V Note For details about the relationship between the wiring system and how measured and computed values are determined see appendix 1 Symbols a...

Страница 74: ...communication control programs WT310 WT310HC WT332 WT333 PC monitor Saved data Setting changes The WT300 series can be connected to a PC using the following communication interfaces USB GP IB RS 232 Ethernet This section explains how to connect the WT300 series to a PC via USB To connect to a PC via a different communication interface see chapter 4 in the WTViewerFreePlus User s Manual IM 760121 0...

Страница 75: ...e instructions on the screen to install the software The following two items will be installed one after the other WTViewerFreePlus YKMUSB USB driver 6 On Windows Vista or Windows 7 the User Account Control window will appear during the installation Click Allow or Yes to continue the installation 7 After the installation finishes a new WTViewerFreePlus folder is added to the Start menu in Windows ...

Страница 76: ...erFreePlus User s Manual IM 760121 02E Example of a Window for Configuring the WT300 series You can change the WT300 series settings from a PC Example of a Window Showing the Measured Data of the WT300 series You can display multiple measured data items at the same time and save measured data to files 2 12 Connecting to a PC via USB Installing WTViewerFreePlus ...

Страница 77: ...twice The first time is for the positive measurements and the second time is for the negative measurements MATH and THD are displayed on the left side of the 7 segment LED display Press SHIFT before pressing FUNCTION to change the displayed function in reverse order Selecting Which Element to Display Only on the WT332 WT333 Press ELEMENT to select which element to display Each time you press ELEME...

Страница 78: ...FT The SHIFT key illuminates to indicate that the keys are shifted Now you can select the setup menus and functions written in purple below the keys 2 Press the desired setup or execution key Using the and Keys The operation varies as indicated below depending on what you are setting When you are setting a value you can use the keys to increase and decrease the value When you are selecting a setti...

Страница 79: ... SHIFT when the digit that is being set is the digit that is furthest to the right the digit that is being set will switch to the leftmost digit that can be set 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 Moves the digit that is...

Страница 80: ...hat you have entered or when you want to redo measurement from scratch Procedure Follow the procedure indicated by the thick lines in the following menu 3 Display C 4 5 End the operation and if YES is selected initialize the settings Confirm that you want to initialize the settings 2 Select initialization Display B 1 Explanation For details on initialization see section 8 2 in the User s Manual IM...

Страница 81: ... range blinks in display C If you previously set the voltage range to the AUTO indicator for the voltage range is lit the voltage range that has been automatically selected on the basis of the measured voltage blinks 2 Press or to display the voltage range that you want to select in display C 3 Press The voltage range is confirmed and each of the displays returns to showing measured values The fig...

Страница 82: ...been automatically selected on the basis of the measured current blinks 2 Press or to display the current range that you want to select in display C 3 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 Ran...

Страница 83: ... Manual IM WT310 01EN WT332 WT333 Current Ranges Display C 1 3 Confirm the setting Display C 1 3 Confirm the setting When the Crest Factor Is Set to 6 When the Crest Factor Is Set to 3 The unit is A The unit is A 2 2 There are more ranges to choose from on models with the EX1 or EX2 option For details see section 2 4 in the User s Manual IM WT310 01EN Note In addition to the above operation you ca...

Страница 84: ...lement 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 The current and voltage values do not have any physical meaning See appendix 1 for the formula that is used to determine the total power For the procedure for selecting input element Σ see section 4 4 Configuring ...

Страница 85: ...y A on the WT310 WT310HC Function keys Press the key for display A and select V When you press the function and unit indicators for display A light in the following order To display the voltage on display A press the key until V lights Display A V var A W VA TIME V Reactive power Integration time Apparent power Active power Current Voltage The WT310 WT310HC moves the decimal point so that the meas...

Страница 86: ... 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 m 10 3 k 10 3 M 10 6 2 Press the key for display A to select input element 1 2 3 or Σ When you press the element indicators for display A light in the following order Display A 1 2 3 1 2 3 On the WT332 the two inpu...

Страница 87: ...UTION 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 WT300 series D A Output CAUTION Do not short or apply an external voltage to the D A output terminal Doing so may damage the WT300 series When connecting the D A output to another device do not connect the wrong signal...

Страница 88: ...ion No Connection No Connection DA 4ch DA12 WT332 WT333 No Connection 1 2 3 4 5 6 7 8 9 10 11 12 EXT COM EXT HOLD EXT START EXT RESET DA COM No Connection DA 11ch DA 9ch DA 7ch DA 5ch DA 3ch DA 1ch EXT SINGLE EXT STOP INTEG BUSY DA COM DA 12ch DA 10ch DA 8ch DA 6ch DA 4ch DA 2ch Pin No Signal Name Signal Name output output output output output output output output output output output output input...

Страница 89: ...vel during integration Use this signal when you are observing integration Approx 25 ms or more Approx 25 ms or more Holding the Updating of Displayed Data This produces the same effect as pressing HOLD Apply an EXT HOLD signal as shown in the following figure EXT HOLD Display hold Approx 25 ms or more Updating Held Display Data This produces the same effect as pressing SINGLE While the display is ...

Страница 90: ...Press and to set area A the output function Press to move to area B Press and to select an element you cannot select an element for On the WT332 WT333 select the element in the following steps 9 and 10 1 13 Confirm the setting Close menu 2 6 14 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 WT332 WT33...

Страница 91: ...age peak current peak and integrated values using a 5 V FS DC voltage Number of Channels 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 WT332 WT333 12 channels Output Format You can select a preconfigured output format or configure your own original format Using the Default Settings Select one of the de...

Страница 92: ...r setting the D A output format You can select from the following options u voltage U i current I P active power P VA apparent power S VAr reactive power Q PF power factor λ dEG phase angle Φ uFrq voltage frequency fU iFrq current frequency fI uP peak voltage value Upk iP peak current value Ipk Ph sum of watt hours Wp Ph positive watt hour Wp Ph negative watt hour Wp Ah sum of ampere hours q Ah po...

Страница 93: ...xcept for those indicated below is 0 V Efficiency average active power during integration D A Output Range Mode Range Mode For products with firmware version 1 04 and later You can select the D A output range mode from the following options The default setting is Fixed You can set this feature by sending communication commands through the communication interface You cannot set this feature from th...

Страница 94: ... your own relay and relay driving circuit Below the lower limit 5 V output Greater than or equal to the lower limit and less than the upper limit 0 V output Greater than or equal to the upper limit 5 V output Maximum and Minimum Values in Manual Range Mode and Comparison Upper and Lower Limits in Comparator Mode You can select a value between 9 999E 12 and 9 999E 12 The default settings are shown ...

Страница 95: ...s D A output Approx 7 5 V Approx 7 0 V 5 0 V 0 5 0V 100 100 140 140 Approx 7 0 V Approx 7 5 V Displayed value Displayed Value 140 100 0 100 140 Output Approx 7 0 V 5 0 V 0 V 5 0 V pprox 7 0 V The range between 5 to 7 V and 5 to 7 V is not output for λ and Φ When an error occurs the output is approximately 7 5 V For the efficiency math function 5 V represents 100 For Upk and Ipk 5 V represents the ...

Страница 96: ...t 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 WT332 WT333 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 t...

Страница 97: ...Check the measurement cable wiring 2 8 to 2 11 Check the wiring system Applies to the WT332 WT333 2 8 to 2 11 2 21 Confirm that the line filter is off 2 91 Check the measurement period settings 2 81 Check the FAQ at the following URL http tmi yokogawa com Turn the power off and then on again 2 4 Keys do not work Check the REMOTE indicator If the REMOTE indicator is illuminated press SHIFT LOCAL to...

Страница 98: ...eset the integration operation 5 32 842 You tried to start integration during an integration operation 5 32 843 The integrated value overflowed during integration or ended abnormally because of power failure or some other reason Reset the integration operation 5 32 844 You tried to stop integration when no integration operation was taking place 5 32 845 You tried to reset integration when the mode...

Страница 99: ...aler to have parts replaced Part Name Recommended Replacement Interval Current input relay only for the WT310 A relay for switching the current input circuit The relay s specifications indicated below Electrical life Approximately 50 000 operations at the rated capacity Mechanical life Approximately 1 000 000 operations Backup battery lithium 3 years ...

Страница 100: ...6 4 IM WT310 02EN 6 4 Calibration and Adjustment For calibration and adjustment contact your nearest YOKOGAWA dealer ...

Страница 101: ...t resistance Approx 2 MΩ input capacitance Approx 13 pF in parallel with the resistance Current Direct input 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 Input resistance Approx 6 mΩ input inductance Approx 0 1 μH in series with the resistance WT310 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 Inp...

Страница 102: ...r RMS value of 40 A whichever is less WT310 Crest factor 3 5 mA 10 mA 20 mA 50 mA 100 mA 200 mA Crest factor 6 2 5 mA 5 mA 10 mA 25 mA 50 mA 100 mA Peak value of 30 A or RMS value of 20 A whichever is less WT310HC Crest factor 3 1 A 2 A 5 A 10 A 20 A 40 A Crest factor 6 0 5 A 1 A 2 5 A 5 A 10 A 20 A Peak value of 150 A or RMS value of 44 A whichever is less External current sensor input Peak value...

Страница 103: ...T310HC and external current sensor input EX2 Option Within 0 001 f of range Maximum rated range Rated range The maximum rated range is 600 V for the voltage input terminal and 20 A for the current input of WT310 WT332 WT333 and 40 A for the current input terminal of WT310HC and 2 V for option EX2 5 mA 10 mA 20 mA 50 mA 100 mA and 200 mA ranges of WT310 Within 0 0002 f of range Maximum rated range ...

Страница 104: ... Hz A Hz THD V THD A D D D D voltage frequency current frequency total harmonic distortion of voltage total harmonic distortion of current During harmonic measurement Item Indicator Displayed On Meaning U I P k Uhdf Ihdf Phdf ΦU ΦI λ fU fI Uthd Ithd V A W or in 7 segment display V A W V A PF V Hz A Hz THD V THD A A B C D A B C D A B C D A B B B B B D D D D D harmonic voltage harmonic current harmo...

Страница 105: ... 0 1 of reading 0 2 of range 1 kHz f 10 kHz 0 07 f of reading 0 3 of range 0 07 f of reading 0 3 of range 0 13 f of reading 0 3 of range 10 kHz f 20 kHz 0 13 f of reading 0 5 of range 10 kHz f 100 kHz 0 5 of reading 0 5 of range 0 04 f 10 of reading 0 5 of reading 0 5 of range 0 04 f 10 of reading Influence of temperature changes after zero level compensation or range change Add 0 02 of range C to...

Страница 106: ...val When the data update interval is 100 ms add 0 05 of reading to the 0 5 Hz to 1 kHz accuracies Guaranteed accuracy ranges for frequency voltage and current direct input All accuracy figures for 0 5 Hz to 10 Hz are reference values The current accuracy figures for DC 10 Hz to 45 Hz and 400 Hz to 30 kHz when the current exceeds 20 A are reference values WT310 only The maximum current input is 6 A...

Страница 107: ...caused by voltage input Add 0 0000001 U2 of reading to the AC power accuracies Add 0 0000001 U2 of reading 0 0000001 U2 of range to the DC power accuracies U is the voltage reading V Influence of self generated heat caused by voltage input lasts until falling the temperature of the input resistor even if voltage input decreases Influence of self generated heat caused by current input WT310 Add 0 0...

Страница 108: ...as the temperature coefficient for voltage and current Accuracy when the crest factor is set to 6 Accuracy obtained by doubling the measurement range error for the accuracy when the crest factor is set to 3 Accuracy of apparent power S Voltage accuracy current accuracy Accuracy of reactive power Q Accuracy of apparent power 1 0004 λ2 1 λ2 100 of range Accuracy of power factor λ λ λ 1 0002 cosf cos...

Страница 109: ...sured value is updated Range decrease The range is decreased when all of the following conditions are met Urms or Irms is less than or equal to 30 of the measurement range Urms or Irms is less than or equal to 125 of the next lower measurement range Crest factor 3 Upk Ipk value of the input signal exceeds 300 of the currently set measurement range Crest factor 6 Upk Ipk value of the input signal e...

Страница 110: ...s set to 6 Frequency filter is ON when measuring voltage or current of 200 Hz or less Accuracy 0 06 of reading 7 4 3 Computation Item Specifications Computing equation of apparent power S reactive power Q power factor λ and phase angle Φ i Input element number Single Phase Three Wire 1P3W Three Phase Three Wire 3P3W Three Phase Three Wire 3V3A Three Phase Four Wire 3P4W UΣ V U1 U3 2 U1 U2 U3 3 IΣ ...

Страница 111: ...ndard integration mode or repetitive integration mode Timer Automatically stop integration by setting a timer Selectable range 0 hours 00 minutes 00 seconds to 10000 hours 00 minutes 00 seconds Set automatically to manual integration mode for 0 hours 00 minutes 00 seconds Count overflow Holds the elapsed integration time and integration value and stops integration when the elapsed time of integrat...

Страница 112: ...tage Current Power 10 Hz f 45 Hz 0 15 of reading 0 35 of range 0 15 of reading 0 35 of range 0 35 of reading 0 50 of range 45 Hz f 440 Hz 0 15 of reading 0 35 of range 0 15 of reading 0 35 of range 0 25 of reading 0 50 of range 440 Hz f 1 kHz 0 20 of reading 0 35 of range 0 20 of reading 0 35 of range 0 40 of reading 0 50 of range 1 kHz f 2 5 kHz 0 80 of reading 0 45 of range 0 95 of reading 0 45 ...

Страница 113: ... 9 Crest factor 99999 9999 Four arithmetic operation 99999 9999 Average active power 99999 9999 Voltage peak 99999 9999 Current peak 99999 9999 Power peak 99999 9999 The computation accuracy the value calculated from the measured value is one half the display resolution Maximum display display range During harmonic measurement Displayed item When the number of displayed digits is 5 When the number...

Страница 114: ...n for stored measurement data Setup information Saves Loads four patterns of setup information Number of blocks which can be stored Model normal measurement normal harmonic measurement WT310 WT310HC 9000 700 WT332 4000 300 WT333 3000 200 Harmonic Measurement G5 Option Harmonic measurement function is turned ON 7 5 External Current Sensor Input EX1 and EX2 options Item Specifications Allows input o...

Страница 115: ... Code ISO ASCII codes Mode Addressable mode Addresses 0 to 30 Clear remote mode Press LOCAL to clear remote mode except during Local Lockout 7 9 Serial RS 232 Interface Standard on C2 Item Specifications Connector type D Sub 9 pin plug Electrical specifications Complies with EIA 574 EIA 232 RS 232 standard for 9 pin Connection Point to point Transmission mode Full duplex Synchronization Start stop...

Страница 116: ...SE TX 10BASE T Transfer rate 100 Mbps max Communication protocol TCP IP Supported services DHCP remote control VXI 11 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...

Страница 117: ...ion cover 1 piece that matches the main unit Hind feet rubber 1 set User s manual 1 piece this manual Safety terminal adapter WT310 WT310HC Red Black 1 set WT332 Red Black 2 sets WT333 Red Black 3 sets Safety standard1 Compliant standard EN61010 1 EN61010 2 030 Installation category overvoltage category CAT II2 Measurement Category CAT II3 Pollution degree 24 Emission1 Compliant standards EN61326 ...

Страница 118: ...oard 3 This instrument is measurement category II product Do not use for Measurement Categories III and IV Measurement category O applies to measurement of other circuits that are not directly connected to a main power source Measurement Category II applies to electrical equipment that is powered through a fixed installation such as a wall outlet wired to a distribution board and to measurement pe...

Страница 119: ...unting surface Mounting surface Mounting surface 20 20 20 250 213 88 179 19 480 460 99 50 24 5 99 50 24 5 480 460 482 6 460 482 6 463 88 76 2 5 9 88 76 2 5 9 Mounting surface 20 11 6 11 6 7 1 7 1 Unless otherwise specified tolerances are 3 however tolerances are 0 3 mm when below 10 mm 73 23 356 359 1 1 1 1 1 1 1 1 0 2 0 2 0 2 0 2 0 0 3 0 0 3 0 0 3 0 0 3 ...

Страница 120: ...e 20 20 20 213 13 132 20 480 460 24 5 149 100 24 5 480 460 482 6 460 482 6 463 37 4 132 57 2 37 4 Mounting surface 20 6 17 6 7 1 7 1 Unless otherwise specified tolerances are 3 however tolerances are 0 3 mm when below 10 mm 57 2 132 17 149 100 327 28 5 23 34 1 1 1 1 1 1 0 2 0 2 0 2 0 2 0 0 3 0 0 3 0 0 3 0 0 3 1 1 7 14 External Dimensions ...

Страница 121: ...e effect of iV on the measurement accuracy is 0 01 or less If the input voltage is 100 V and the current is 5 A iV 0 05 mA 100 V 2 MΩ so the effect of iV on the measurement accuracy is 0 001 0 05 mA 5 A SOURCE LOAD WT300 series V C iV iL LOAD SOURCE U I C V As a reference the relationships between the voltages and currents that produce effects of 0 01 0 001 and 0 0001 are shown in the figure below...

Страница 122: ... circuit Outer case Grounding Shielded case of the current measurement circuit As an example we will consider the case when the outer case and one side of the power supply are grounded In this case there are two conceivable current flows iL and iCs iL is the load current and iCs is the current that flows through the stray capacitance iL flows through the current measurement circuit then through th...

Страница 123: ...s cannot be ignored If you connect the WT300 series current input terminal to the side of the power supply SOURCE that is close to its earth potential the WT300 series current measurement circuit positive and negative terminals are close to the earth potential so VCs becomes approximately zero and very little iCs flows This reduces the effect on measurement accuracy ...

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