Toshiba LF414 Flow rate indicated is not correct, － ４５ －, ６Ｆ８Ａ０８７０, Start, set?, as specified?

Page 46
7.2.2Flow rate indicated is not correct

６Ｆ８Ａ０８７０

7.2.2Flow rate indicated is not correct

START START set?

Is the flow range correctly

NO

 

set?

 

YES

 

Is zero point correctly set?

NO

 

YES

 

Is the excitation current

NO

value as stated on the

 

flow direction tag?

 

YES

 

Is the inside wall of detector

YES

pipe contaminated?

 

NO

 

Is the output load resistance

NO

as specified?

 

YES

 

Are there two load

YES

resistors connected to

 

the output in parallel?

 

NO

 

Is accuracy calculated as follows? NO

(Measured flow rate)-(Actual flow rate)

×100%

Actual flow rate

 

YES

Contact your nearest Toshiba representative.

Set correctly.

Refer to combined converter's manual.

Perform the zero adjustment.

Refer to combined converter's manual.

Set correctly.

Refer to combined converter's manual.

Clean the inside of the detector pipe.

Design the output circuit so that the output load resistance is less than

750Ω.

Connect the two load resistors in series, if necessary.
Calculate as shown on the left.

－ ４５ －

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Contents ６Ｆ８Ａ０８７０ About Safety Precautions ６Ｆ８Ａ０８７０－ １ － Integral type LF414/LF600F, LF414/LF610F, LF414/LF620FSafety symbols SAFETY PRECAUTIONSExplanation of signal words － ２ －DON’T SAFETY PRECAUTIONS Safety Precautions for Installation and Wiring－ ３ － „ Do not modify or disassemble the enclosureDON’T SAFETY PRECAUTIONS continuedSafety Precautions for Installation and Wiring － ４ －Usage limitation Safety Precautions for Maintenance and InspectionWarranty and Limitation of Liability － ５ －・Places where excessive vibration or mechanical shock occurs Handling Precautions－ ６ － 2 Wire cables correctly and securelyHandling Precautions continued － ７ －Table of Contents － ８ －1.2 Strage 1. Product Inspection and Storage1.1 Product Inspection － ９ －－ １０ － Features2. Overview 5 Intelligent functions3.1.1 Appearance of LF414/LF600F, LF414/LF610F 3. Names of Parts3.1 Appearance Integral 1 Meter size of 1/2 inch 15mmFigure 3.1.2 Appearance of LF414/LF600F, LF610F Meter size 1 inch25mm 2 Meter size of 1inch 25mm－ １２ － Ground terminal for converterFigure 3.1.3 Appearance of LF414/LF600F, LF610F 3 Meter size of 1 1/2 to 4 inch 40 to 100mm－ １３ － Meter size 1 1/2 to 4 inch 40 to 100mmLifting Lugs 4 Meter size of 6 and 8 inch 150 and 200mm－ １４ － providedFigure 3.1.5 Appearance of LF414/LF620F Meter size 1/2inch15mm 3.1.2 Appearance of LF414/LF620F－ １５ － Ground terminal for converter Flow direction arrow DetectorFigure 3.1.6 Appearance of LF414/LF620F Meter size 1 inch25mm － １６ －Ground terminal for converter Flow direction arrow － １７ － Figure 3.1.7 Appearance of LF414/LF620FMeter size 6 and 8 inch 150 and 200mm － １８ －Figure 3.1.8 Appearance of LF414/LF620F Ground terminal for converter Lifting Lugs－ １９ － 3.1.3 Appearance of LF414Separate 1 Meter size of 1/2 inch 15mm Signal cableFigure 3.1.10 Appearance of LF414 Meter size 1 inch25mm － ２０ －for Signal cable for Excitation cableFigure 3.1.11 Appearance of LF414 － ２１ －Signal cable Excitation cableFigure 3.1.12 Appearance of LF414 － ２２ －Meter size 6 and 8 inch150 and 200mm 3.2.2 Terminal Block Construction of LF414 Type Signal cable terminal3.2 Construction of the terminal blocks － ２３ －－ ２４ － 4. InstallationSafety Precautions for Installation „ Use an appropriate device to carry and install－ ２５ － 4.1 Notes on Selecting the Installation Location4.2 Mounting Procedure 4.2.1 Pipe checks 2. Avoid places where excessive pipe vibration occursFigure 4.2 Example of Pipe Fixing Procedure － ２６ －Figure 4.3 Model Diagram of Unsupported Pipes － ２７ － 4.2.2 Installation ProcedureFigure 4.4 LF414 flowmeter detector piping connections － ２８ － Table 4.1 Bolt length and Nut tightening torque4.3 Piping Connections 1a Ideal Upstream Straight Pipe Length Installation Requirements1b Optional “Mount Anywhere” Installation Mount-Anywhere Technology L=5DFigure 4.6 Installation position of the detector 2 Pipe Orientation－ ３０ － Figure 4.5 Detector Piping Orientation－ ３１ － 3 Flow Direction4 Preventing an Empty Pipe Condition Figure 4.7 Flow direction arrow on the detector－ ３２ － 4.4 Grounding1 Grounding of the LF414/LF620F type Figure 4.10 Grounding the LF414/LF620F Type2 Grounding of the LF414 type － ３３ －Safety Precautions for Wiring 5.Wiring－ ３４ － „ Install a switch and fuse to isolate the ６Ｆ８Ａ０８７０－ ３５ － independently from power equipment. 100 ohm－ ３６ － Notes on wiring5.1 Cables Table 5.1 Installation Cables5.2 External Device Connections and Grounding 5.3 Notes on Wiring 5.3.1 Notes on Instrumentation-Converter Wiring5.3.2 Notes on Wiring of the Separate type LF414 － ３７ －Separate 2 Excitation cable 5.4 Wiring 5.4.1 Terminal Treatment of Cables1 Power cable, current output cable, digital I/O cables － ３８ －－ ３９ － 3 Connecting the input signal cableNotes on signal cable shield processing work Figure 5.3 Terminal Treatment of Flow Rate Signal Cable－ ４０ － 5.4.2 Cable ConnectionFigure 5.5 Connecting a Cable to Terminal Block － ４１ － 6. OperationPreparatory check „ Check the wiring between the converter and related instruments－ ４２ － 7. Maintenance and TroubleshootingSafety precaution for Maintenance and Troubleshooting „ Do not conduct wiring work when power is appliedCheck/Replacement of the display unit 7.1 Maintenance„ Cleaning materials－ ４４ － 7.2 Troubleshooting7.2.1 Flow rate is not indicated START Are power supplies correct NO for each device? YESPerform the zero adjustment Refer to combined converters manual 7.2.2 Flow rate indicated is not correct－ ４５ － Clean the inside of the detector pipeIs power supply voltage 7.2.3 Flow rate indication is not stable－ ４６ － Use a power supply within the specified range－ ４７ － 8. Principle of OperationSquare-Wave Excitation Figure 8.1 Principle of Operation － ４８ － 9. Specifications9.1Specifications Measurement range in terms of flow velocityElectrical conductivity μS/cm － ４９ －Figure 9.1 Electrical Conductivity vs. Cable Length － ５０ － Table 9.1 Standard Flow RangeUnit gal/min － ５１ －Table 9.2 Flow velocity vs. flow volume Unit m3/h－ ５２ － Table 9.3 Type Specification Code9.2 Type Specification Code － ５３ － Table 9.4 Type Specification Code Exciting Cable and Signal CableExciting cable length Nominal cross-sectional area Overall diameter 1 Meter size of 1/2 inch 15mm 10. Outline Dimensions10.1 Outline dimensions of LF414/LF600F, LF414/LF610F 2 Meter size of 1 inch 25mm3 Meter size of 1 1/2 to 8 inch 40 to 200mm － ５５ －－ ５６ － 10.2 Outline dimensions of LF414/LF620FWaight approx 9 lb 4kg － ５７ － － ５８ － 10.3 Outline dimensions of LF414Waight approx 7 lb 3kg － ５９ － Appendix 1-1 A system block diagram for LF414/LF600F, LF414/LF610F － ６０ －1-2 A system block diagram for LF414/LF620F － ６１ －2-1 A system block diagram for LF414 － ６２ －Phone number （ － ６３ －Distributor Address Name Product codeFCF50017
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