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Rotork YTC YT-1000R Electro Pneumatic Positioner Product Manual | YTC INDIA

YT-1000R series can have options of position transmitter (PTM), which outputs 4-20mA, and/or limit switch (L/S). - It is designed for high durability and performance in high vibration environment. - Durability has proven after testing of 1 million times minimum. - Response time is very short and accurate. - Simple part change can set 1/2 Split Range. - It is economical due to less air-consumption. - Direct/Reverse action can be set easily. - Zero & Span adjustment process is simply. - Feedback Connection is easy.

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Rotork YTC YT-1000R Electro Pneumatic Positioner Product Manual | YTC INDIA

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  1. Electro-PneumaticPositioner YT-1000/1050 SERIES PRODUCTMANUAL VERSION1.01

  2. Contents 2.6PartsandAssembly………………………………………………………………………………..11 2.6.1 YT-1000/1050L……………………………………………………………………………11 2.6.2 YT-1000/1050R…………………………………………………………………………..11 2.6.3 YT-1000L+SPTM(Internal)…………………………………………………………….12 2.6.4 YT-1000R+SPTM (Internal) ……………………………………………………………12 2.6.5 YT-1000R+L/S(Internal)……………………………………………………………….13 2.6.6 YT-1000R+SPTM+L/S(Internal)………………………………………………………13 2.7ProductDimension…………………………………………………………………………………14 2.7.1 YT-1000LFlameproofType…………………………………………………………….14 2.7.2 YT-1000LIntrinsicallySafetyType…………………………………………………….14 2.7.3 YT-1000RFlameproofType ……………………………………………………………14 2.7.4 YT-1000R IntrinsicallySafetyType……………………………………………………15 2.7.5 YT-1000L+SPTM(Internal)……………………………………………………………..15 2.7.6 YT-1000R+SPTM(Internal)……………………………………………………………..15 2.7.7YT-1000R+SPTM+L/S (Internal) & YT-1000R + Dome Indicator …………………...15 2.7.8YT-1050L …………………………………………………………………………………. 16 2.7.9YT-1050R………………………………………………………………………………….16 3.Installation……………………………………………………………………………………………….17 3.1Safety………………………………………………………………………………………………..17 3.2YT-1000/1050LInstallation……………………………………………………………………….17 3.2.1 InstallationSteps………………………………………………………………………...17 3.3YT-1000/1050RInstallation………………………………………………………………………19 3.3.1BracketInformation……………………………………………………………………...19 2 YT-1000/1050series

  3. 3.3.2InstallationSteps…………………………………………………………………………203.3.2InstallationSteps…………………………………………………………………………20 4.Connections……………………………………………………………………………………………..21 4.1Safety………………………………………………………………………………………………..21 4.2SupplyPressureCondition………………………………………………………………………..21 4.3PipingCondition…………………………………………………………………………………….21 4.4Connection–Actuator……………………………………………………………………………...22 4.4.1Singleactingactuator……………………………………………………………………22 4.4.2 Doubleactingactuator…………………………………………………………………..22 4.5Connection–Power………………………………………………………………………………..22 4.5.1 Safety……………………………………………………………………………………...22 4.5.2 Ground…………………………………………………………………………………….23 4.5.3 SPTMInternal(Option)………………………………………………………………….23 4.5.4 L/SInternal(Option)……………………………………………………………………..23 4.5.5 SPTM&L/SInternal(Option)………………………………………………………….24 5.Adjustment……………………………………………………………………………………………….24 5.1Adjustment-Cam………………………………………………………………………………….24 5.1.1 YT-1000/1050L…………………………………………………………………………..24 5.1.2 YT-1000/1050R………………………………………………………………………….24 5.1.3 YT-1000/1050RwithInternalOptions(Option) ………………………………………25 5.2Adjustment–ZeroPoint…………………………………………………………………………...25 5.3Adjustment–Span………………………………………………………………………………….25 5.4Adjustment –SPTM (Option) …………………………………………………………………… 25 5.4.1 Setting…………………………………………………………………………………….25 5.4.2 Calibration………………………………………………………………………………..26 5.5Adjustment – L/S(Option) …………………………………………………………………………26 5.6Adjustment–A/MSwitch(Auto/Manual)…………………………………………………………26 5.7Adjustment–Orifice………………………………………………………………………………..27 5.8Adjustment–Potentiometer……………………………………………………………………….27 6.Maintenance………………………………………………………………………………………………28 7.Troubleshooting………………………………………………………………………………………….29 32 YT-1000/1050series

  4. 1.Introduction GeneralInformationfortheusers Thank you for purchasing YoungTechCo., Ltd products. Each product has been fully inspectedafterits production tooffer youthehighestqualityandreliableperformance. Pleaseread the product manual carefullyprior to installingand commissionthe product. 1.1 • For the safety, it is important to follow the instructions in the manual. Young Tech Co., Ltd will not be responsible for any damages causedbyuser’s negligence. • Themanualshouldbeprovidedtothe end-user. • Any modifications or repairs to the product may only be performed if expressed in this manual. • Themanual canbealteredor revisedwithoutanypriornotice.Anychangesin product’s specification, design, and/or any components may not be printed immediately but until the following revision of themanual. • Themanualshouldnotbeduplicatedorreproduced foranypurposewithoutprior approval fromYoungTech Co., Ltd, Gimpo-si, SouthKorea. 1.2 ManufacturerWarranty • Forthesafety,itisimportanttofollowtheinstructionsinthemanual.Manufacturerwill notbe responsible for any damagescaused by user’s negligence. • Manufacturerwillnotberesponsibleforanydamagesoraccidentsasaresultofany alterationormodificationoftheproductanditsparts.Ifanyalterationormodifications • are necessary,please contactYoungTechCo.,Ltddirectly. • Manufacturerwarrantstheproductfromthedateoforiginalpurchaseoftheproductfor one(1) year, except asotherwisestated. • Manufacturerwarrantywillnotcoverproductsthathavebeensubjectedtoabuse, • accidents, alterations, modifications, tampering, negligence, misuse, faulty installation, lack of reasonable care, repair or service in any way that is not contemplated in the documentation for the product,orif the modelor serial numberhasbeenaltered, tamperedwith,defacedorremoved;damagesthatoccursinshipment,duetoactof God,failuredue topowersurge,orcosmeticdamage.Improperorincorrectly performedmaintenance will voidthis limited warranty. • Fordetailed warranty information,pleasecontactYoungTechCo.,Ltd– South Korea. • ExplosionProofWarning • Pleaseensuretheunitisbeingusedandinstalledwithintheexplosionproofcertified environment. • YT-1000/1050seriesexplosionproofgradesareflameproof-ExdIIB(IIC)T5and • intrinsically safety –Ex ia IIB T6,andit can be usedin zone1 and 2. 1.3 42 YT-1000/1050series

  5. For othercertification,please visitYoungTechCo.,Ltd website(www.ytc.co.kr) • Explosionprooftypeofcablesandgasketsshouldbeused,whenexplosiongasesare presentat the installation site. • Powershouldbeturnedoffcompletelywhenopeningproduct’scover.Whenopening thecover, ensure that there is no powerremaining inany electrical partsnearby. • YT-1000/1050serieshas2portsforpowerconnection.Explosionprooftypewires and packingshould beused.Blind plugis required when anyport isnot being used. • Cablerugwithsurfaceareaofmorethan0.195mm2withM4springwashershouldbe usedto connect thepower. • Forexternalgroundterminal,cablerugwithsurfaceareaofmorethan5.5mm2should beused. • 2.ProductDescription General YT-1000/1050seriesElectro-PneumaticPositioneraccuratelycontrolsvalvestrokein responseto an input signalof 4-20mAfromthecontroller. 2.1 2.2 MainFeaturesandFunctions • 2millionlifecycleguaranteed • Responsetime isveryfastand accurate. • Simple part changecanset1/2splitrange. • Lowairconsumption • SimpleDirect/ReverseActionchange. • SimpleZero&Spanadjustment. • Easyfeedbackconnection. • Internal options, such as position transmitter (PTM) and/or limit switch (L/S) is available (for non-explosion proof positioner – externaloptions must be installed for explosion proofpositioner) • A/M switch can be used to direct supply air to the actuator or to manually operate the positionerorvalve. 52 YT-1000/1050series

  6. 2.3 LabelDescription Fig.1:YT-1000/1050 BodyLabel Model: ExplosionProof: InputSignal: Amb.Temp.: SupplyPressure: SerialNumber.: Indicates the model number of the positioner. Indicatescertified explosionproofgrade. Indicatesinputsignal range. Indicatesthe allowable ambienttemperature. Indicates the supply pressurerange. Indicatesthe unique serial number. 2.4 ProductNumber 2.4.1 YT-1000L 62 YT-1000/1050series

  7. 2.4.2YT-1000R 72 YT-1000/1050series

  8. 2.4.3YT-1050 82 YT-1000/1050series

  9. 2.5 ProductSpecification 2.5.1YT-1000L&R Testedunderambienttemperatureof20’C,absolutepressureof760mmHg,andhumidityof65%.PleasecontactYoungTechCo.,Ltdfordetailedtesting specification.* Explosionproofcertification isinprogress. 92 YT-1000/1050series

  10. 2.5.2YT-1050L&R Testedunderambienttemperatureof20’C,absolutepressureof760mmHg,andhumidityof65%.PleasecontactYoungTechCo.,Ltdfordetailedtesting specification.* Explosionproofcertification isinprogress. YT-1000/1050series

  11. 2.6PartsandAssembly 2.6.1 YT-1000/1050L 2.6.2 YT-1000/1050R YT-1000/1050series

  12. 2.6.3 YT-1000L+SPTM(Internal) 2.6.4 YT-1000R+SPTM(Internal) YT-1000/1050series

  13. 2.6.5 YT-1000R +L/S(Internal) 2.6.6 YT-10000R+SPTM+L/S (Internal) YT-1000/1050series

  14. ProductDimension • YT-1000LFlameproofType 2.7.2 YT-1000LIntrinsicallySafetyType 2.7.3 YT-1000RFlameproofType YT-1000/1050series

  15. 2.7.4 YT-1000RIntrinsicallySafetyType 2.7.5 YT-1000L+SPTM(Internal) 2.7.6 YT-1000R+SPTM(Internal) 2.7.7 YT-1000R +SPTM+ L/S(Internal) &YT-1000R + Dome indicator YT-1000/1050series

  16. 2.7.8YT-1050L 2.7.9YT-1050R YT-1000/1050series

  17. 3.Installation Safety Wheninstallingapositioner,pleaseensuretoreadandfollowsafetyinstructions. 3.1 • Anyinputorsupplypressurestovalve,actuator,and/ortootherrelateddevicesmust beturnedoff. • Use bypass valve or other supportive equipment to avoid entiresystem “shut down”. • Ensurethere is no remaining pressure in theactuator. YT-1000/1050LInstallation YT-1000/1050L shouldbeinstalledonlinearmotionvalvessuchasglobeorgatetypewhich 3.2 • usesspringreturntypediaphragmorpistonactuators. Beforeproceedingwiththe installation,ensure following components are available. • Positionerunit • Feedbackleverandleverspring • Flangenut(bottomsideofYT-1000/1050L) • 4pcsxhexagonal headedbolts (M8x 1.25P) • 4pcsxM8platewasher • InstallationSteps • Properbracketmustbemadeinordertoadaptthepositionerontheactuatoryoke. Pleaseconsider following importantpoints when a bracket is beingdesigned. • Positioner’s feedbacklever mustbeparalleltothe groundat50%of thevalvestroke. • Feedbackleverconnectionwiththepinoftheactuatorclampshouldbeinstalledin • such a way that the valve stroke length coincides with the corresponding figure in “mm” marked on the feedback lever.Improper setting may cause poor linearity and maycreate unnecessaryhuntingduring the operation. • Assemblethepositionerwith thebracketmadein previous step by fastening the bolts. Please refer to the backsideof thepositioner forsizeof thebolts. The standard bolt size is M8 x 1.25P.Please contact Young TechCo., Ltdfor other boltsizes. • Attachthepositionerwithbrackettotheactuatoryoke–DONOT TIGHTENPOSITIONERCOMPLETELY. • Connect positioner’s feedback lever to the actuator clamp. The hole gap on the feedback lever is 6.5mm. The connection pin’s outerdiametershould be less than 6.3mm. YT-1000/1050series

  18. Connectsupplypressuretotheactuatortemporarily.Supply enoughsupplypressureto the actuatorinorder to position the actuatorclamp at50% of the total valve stroke. Insertconnectionpinintothefeedbacklever.Thepinshouldbeinsertedwhenthe actuator clamp is at 50% of the total valvestroke. Properway to connectfeedback lever,connectionpin,and leverspring 7.Check if feedback lever is parallel to the ground at 50% of the valve stroke.If it is not parallel, adjust the bracket or feedback link bar to make parallel.Improper installation may cause poorlinearity and may createunnecessary huntingduring the operation. 8.Check the valve stroke.The stroke marks are indicated on the feedback lever of the positioner.Position the connection pin at the number on the feedback lever which corresponds to the desired valve stroke. Toadjust, move the bracket, the connection pinor both. Fig.3: PinInsertionwhenvalvestrokeis 40mm(up) and is90mm(bottom) 9.Afterinstallingthepositioner,operatethevalvefrom0%to100%strokebyusingdirect YT-1000/1050series

  19. air to the actuator (manual position).On both 0% and 100%, the feedback lever should not touch the lever stopper, which is located on the backside of the positioner.If the feedback lever touches the stopper, the positioner should be installed further away from theyoke. Fig.4: Feedbacklevershouldnottouchleverstopper0%~100%valvestroke. 10.Aftertheinstallation,tightenalloftheboltsonthebracket,thefeedbacklever,andthe connection pin. YT-1000/1050RInstallation YT-1000/1050Rshouldbeinstalledonrotarymotionvalvesuchasballorbutterflytype whichusesrackandpinion,scotchyokeorothertypeofactuatorswhichstemrotates90 degrees. Before proceeding with the installation,ensure followingcomponents areavailable. 3.3 • Positionerunit • Forkleverandleverspring • Standard rotary bracket(included with thepositioner) • 4pcsxhexagonal headedbolts (M8x 1.25P) • 4pcsxM8platewasher Fig. 5:Fork lever type (left)andNAMUR lever type (right) 3.3.1Bracketinformation Standardbracket(includedwiththepositioner)containstwocomponents.Thebracketcan be used for both fork lever and NAMUR lever type.The bracket is designed to fit onto the actuatorwith20mm stem height (H).If actuator’s stem height (H) is30mmor50mm, bracket mustbe adjusted.Please referto below tablehow to adjust the bracket. 129 YT-1000/1050series

  20. InstallationSteps • Pleasechecktheactuator’sstemheightandadjustthebracketby referringto the bracket table. • Attachedthebracketontotheactuator.Itisrecommendedtousespringwashersothe boltswill not be loosen fromvibration. • Set rotation position of the actuator stem at 0%. For single acting actuator, it is easy to check 0% point by supplying no pressure to the actuator.For double acting actuator, check actuator stem’s rotation direction – clockwise or counter-clockwise - by supplying pressuretotheactuator. • Install the fork lever after setting actuator’s stem at 0%.Check the actuator stem’s rotation direction – clockwise or counter-clockwise.Installation angle of the fork lever should be 45 degrees in relation to the linear shaft. For NAMUR shaft installation, the angle doesnot matter. Fig.6: Counter-clockwiseandclockwiserotation. YT-1000/1050series

  21. After setting fork lever position, assemble lock nuts which are located on the bottom of the fork lever. Ensure tosettheheightof theupper forklever between 6~11mm, which is lower than the upper bracket’sheight. Attach thepositioner tothebracket.Fixthe clampingpinon themainshaft’scenterof the positionerand insertconnectionpininto thefork lever slot.This will lock to the fork lever spring. Setting alignment of the main shaft of the positioner and center of the actuator’s stem is very important. Poor alignment of the main shaft and the actuator’s stemdecreases thepositioner’sdurabilitydue to unnecessaryforceson themain shaft. Tighten thepositionerandthebracketwithhexagon-headedboltsandplatewasherafter checkingthepositioner’sposition. 4.Connections 4.1 Safety • Supply pressureshouldbe clean anddryair– avoidingmoisture, oilordust. • Alwaysrecommended to use air filterregulator (i.e.YT-200 series). • YoungTechCo.,Ltdhasnottestedpositioner’soperationwithanyothergases otherthan clean air.Please contactYoungTech Co., Ltdfor anyquestions. 4.2 SupplyPressureCondition • Dryairwith at least 10℃lower than ambient temperature. • Avoidfrom dustyair.Positioner’s innerfilter can only filter5 micron or larger. • Avoidoil. • Comply withANSI/ISA-57.3 1975(R1981)or ISAS7.3-1975(R1981). • Supply pressurerange is1.4 ~7 kgf/cm2(140-700 kPA) • Set airfilter regulator’spressurelevel10%higherthan actuator’sspringrangepressure. • PipingCondition • Ensureinsideof pipe is clean of obstructions. • Do not use pipeline that issqueezed orshows any type ofdamamges. 4.3 YT-1000/1050series

  22. Pipelineshouldhavemorethan6mmofinnerdiameter(10mmouterdiameter)to maintainflowrate. • Thelengthofpipelinesystemshouldnotbeextremelylong.Longerpipelinesystem mayaffect flowrate due tothefriction insideof the pipeline. • Connection–Actuator • Singleactingactuator • Singe acting type positioneris set to use OUT1 port. OUT1 portshouldbe connectedwith supply pressureport from actuatorwhen usingsingle acting type of springreturn actuator. Fig. 7:Singeactinglinear(left)and rotary(right)typeactuator 4.4.2 Doubleactingactuator DoubleactingtypepositionerissettouseOUT1andOUT2port.Asinputsignalincreases, the supply pressure will besupplied through OUT1 port. • Fig. 8:Doubleacting linear (left)and rotary (right) typeactuator • Connection–Power • Safety • Wheninstallinginhazardousandexplosivegasarea,conduittubeorpressure-proof • packingunionmustbeused.Thecompoundchargingboxshouldbetheflameproof typeand must be sealedcompletely. • Conduitentryconnection tap is PF1/2 or G1/2. • Beforeconnectingterminal,ensurethatthepowerisoffcompletely.Donotopenthe coverwhenthe power isstill alive. • Please usering-type rugto protect against vibrationorany other external impact. • PositionerwithPTMoptionsmustbesupplied10~28VDCseparately.ForL/Soption, separate12-24VDCmustbesupplied.Forbothoptions,itshouldnotexceed30V YT-1000/1050series

  23. DC. • Positionershouldbe grounded. • Pleaseusetwistedcablewithconductorsectionare1.25mm2andthatissuitablefor • 600V (complying to the conductor table of NEC Article 310.) The outer diameter of the cable should be between 6.35 ~ 10mm.Use shield wire to protect against electro- magnetic field and noise. • Please donotinstall the cablenearhighnoiseequipments, such ashigh-capacity transformeror motor. 4.5.2Ground 4.5.3 SPTMInternal<Option> 4.5.4 L/SInternal<Option> YT-1000/1050series

  24. 4.5.5 SPTM&L/SInternal<Option> 5.Adjustments Adjustment–Cam YTCsetspositionerasReverseAction<RA>unlessspecifiedotherwisewhenplacingan order. 5.1.1 YT-1000/1050L 5.1 5.1.2 YT-1000/1050R YT-1000/1050series

  25. 5.1.3 YT-1000/1050R with Internal Options <Option> CamcanbeadjustedforYT-1000/1050Rwithoptionsbydissemblingthecamfromthemain shaft.After dissembling thecam fromthe main shaft,please follow5.1.2 for RAorDAcam. Adjustment–ZeroPoint 1. Set supply signal at 4mA or 20mA – according to RA or DA – and rotatetheadjusterupordownwardtoadjustactuator’sinitialpoint. As zero point is being set, the specification of the valve system must be considered. Please refer to diagram on the right to increase or decreasethezero point. 5.2 5.3 Adjustment–Span After setting zero, supply signal at 20mA or 4mA – according toRAorDA–andchecktheactuatorstroke.Ifthestroke is too low,the spanshould be increased.If the stroke is toohigh, thespan should be decreased. Changingspanpointwillaffectzeropointsetting. Zero pointshouldbesetagainafterspanhasbeenadjusted. This step is required until both zero and span are properly set. Afterpropersetting,tightenlockscrew. • Adjustment–SPTM<Option> • SettingPointSwitch • Thereare twotypesof calibration ofSPTM/feedback signal. • 2PointSetting • Thissettingonlysetminimumandmaximumpoint(0%and100%). Inbetweenpoints YT-1000/1050series

  26. willbecalculatedautomatically. • 2.5PointSetting • Thissettingset5points(0%,25%,50%,75%,and100%).Thisrequiresmoresetting, but feedback setting will bemore accurate than2 pointsetting. • Calibration • Supply4mAinputsignaltothepositionerandcheckifvalvepositionmadetoitstarget position.For DirectAction (DA), supply 20mAinstead of4mAfor inputsignal. • Press4mAbuttononthePCBfor3~4seconds.LEDlampwillblinkindicatingthatthe PCB hascalibrated thespecific positionto give 4mAas feedback. • Repeatabovestepfor8mA,12mA,16mA,and20mA.For2pointsetting,only4mA and20mAshould beset. 5.5 Adjustment– L/S<Option> 5.6 Adjustment–A/MSwitch(Auto/Manual) A/M switch is used when the valve needs to be operated manually. Ifswitchissetas“A”,thepositionerwillrespondtoinput signal. If switch is set as “M”, the positioner will act as bypassandsupplypressuretothepositionerwilldirectly gototheactuator. Pleasemakesure tosetback to“A”after manual operation.Also, pleaseDONOTTOUCHSEAT ADJUSTER BOLTON THEPILOTRELAY. YT-1000/1050series

  27. Adjustment-Orifice Iftheactuatorsizeistoosmallrelativetotheflowrate,positionercanhavehunting/ oscillation.Inorder to avoid hunting, the orifice must be inserted. 5.7 Removethepilotrelayassembly fromthe positioner. Remove the o-rings from OUT1 and OUT2 port per above diagram, and insert proper orifice. Before re-assemble the o-rings, please make sure there is no dust or particles remainon theports. Adjustment-Potentiometer Externaldamageorphysicalshock candislocatepotentiometers factorysetting. Potentiometer mustbere-calibratedwhendislocationof the potentiometeroraftercam adjustment.PLEASE REFERBELOWINSTRUCTIONANDDIAGRAM. 5.8 Please set actuatorposition to 50%of the valve stroke.PLEASE MAKE SURE THAT THEACTUATORDOES NOT MOVEDURING THE RE-CALIBRATION. Inthejunctionbox,pleasepulloutthepotentiometerconnectorfrompotentiometerPCB. DO NOT PULLWITHTOO MUCH FORCEAS WIRES CANBE DAMAGED. Onthepotentiometerconnector,therearethreeholes. Outofthreeholes,please measureresistancelevelbypluggingtwoholes<oneofrightorleftandoneof center>.Thepotentiometerresistancelevelshouldbebetween0~10KΏandplease adjustmeasurementequipmenttomeasurebetweenabovementionedrange. Using“+”screwdriver,loosenpotentiometerstopperbolt. DONOTLOOSEN COMPLETELY. Pullpotentiometerbehindandpotentiometerwillbeseparatedfrompotentiometergear. Thiswillmakeuser toturnpotentiometergear. Sincecurrentactuatorpositionis50%ofthevalvestroke,theresistancelevelshouldbe measure around 5KΏ(4.8~4.2KΏ)byturningpotentiometergear. Afterthesetting,assemblebackthestopperandthebolt. YT-1000/1050series

  28. Maintenance • Maintenanceonpilot relay valveisrecommended to performatleastonce a year ofwithor without operation. When dissembling the pilot relay valve, please be careful not to loose any o- rings orstabilizerspring.Pleaserefer to belowinstruction and diagram. • Pleaseremovepilotrelaylockbolts. • UnlockAuto/Manual(A/M)Switchfromthepilotrelay.PLEASEMAKESURETOREMOVE A/MSWITCH. • Removeany particles or dust by blowing air. YT-1000/1050series

  29. Troubleshooting • ▶Positionerdoesnotrespondtotheinputsignal. • Check supply pressure level. The lever must be at least 1.4 kgf/cm2.For spring-return type of actuator, the supply pressure level has to be larger than the spring's specification. • Check if input signal is properly supplied to the positioner. The signal should be 4~20mADC. • Checkif zeropoint orspanpointis properly set. • Check if the positioner'snozzle has beenblocked.Also, check if the pressure is • supplied to the positioner and the pressure is being exhausted through the nozzle. If the nozzle hasbeen blockby any substances, please send the product for repair. • Checkiffeedbacklever has been installedproperly. • ▶Thepressure ofOUT1reachesexhausting pressurelevel anddoes not come back down. • Check A/M Switch.If the switch has been damaged, replace the switch or pilot relay valve. • Check for a gap or damages between the nozzle and the flapper.If damaged, please sendthe product toYTCforrepair. • ▶The pressure isexhausted onlyby A/MSwitch. • (1)Check if the positioner's nozzle has been blocked.Also, check if the pressure is supplied to the positioner and the pressure is being exhausted through the nozzle. If the nozzle has been blocked by any substances, please send the producttoYTCfor repair. • ▶Huntingoccurs. • Checkif safetyspring hasbeen displaced.(NexttoPilotrelayvalve) • Check if the size of actuator is too small. If so, insert an orifice in order to reduce the pressure flowrate. • Check if there is any friction between the valve and the actuator. If so, increase actuator's sizeor reduce thefrictionlevel. • ▶ActuatoronlyoperatesbyOn/Off. • (1)Check actuator and positioner's acting type.Air pressure exhausts from YT-1000L's OUT1 port as input signal level increases.Therefore, it is standard to connect to OUT1 port when single actuatorisused.Make surethespanadjustmentisproperly set according to the valve system. • ▶Linearityistoolow. • Checkif positionerisproperlypositioned.Especiallycheckif the feedbackleverisparallel to theground at50%point. • Check if zero and span point have been properly adjusted. If either one of values is being adjusted, another one mustbe re-adjusted as well. • Check ifsupplyairpressurelevelisstable from the regulator.If the levelisunstable, the regulatormust be replaced. • ▶Hysteresisistoolow. • Incaseofdoubleactingactuator,checkifseatadjustmenthasbeenproperly performed.Please contact YTC for any further inquiries regarding theseat adjustment. • Backlash can occur when the feedback lever and lever spring are loosen. To avoid backlashing,please adjustthe lever spring. • Check if theconnection bar tothe feedback lever is tightly fastened. YT-1000/1050series

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