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无锡职业技术学院毕业设计中英文翻译2英文FX2seriesPLCconstitutionelevatorcontrolsystemcharacteristicanalysisAbstractInthearticlehasanalyzedtheelevatorloadcharacteristics,elaboratedusesthetrapezoidaccelerationcurvetheelevatoridealvelocitycurve,unifiesthefrequencychangerandthePLCperformance,elaboratedtheelevatorcontrolsystemconstitutionandtheoperationalfactor.Elaboratedtheelevatorspeedcurveproducesthemethod,hasinducedthecharacteristicwhichdesignsbyPLCconstitutioncontrolsystemsoftware.KeywordLoadcharacteristicsidealvelocitycurvecontrolsystemsoftwaredesign1.OutlineAlongwiththeurbanconstructionunceasingdevelopment,thehighriseconstructionunceasinglyincreases,theelevatorhasthewidespreadapplicationinthenationaleconomyandthelife.Theelevatortookinthehighriseconstructiontheverticalmovementtransportationvehiclealreadyandpeoplesdailylifeisinseparable.Infacttheelevatorisaccordingtoexteriormovementandsooncallingsignalaswellasowncontrolrule,butcallsisstochastic,theelevatorisapersonmachineinteractivecontrolsysteminfact,purelyiscannotsatisfythecontrolrequestwiththesequentialcontrolorthelogicalcontrol,Therefore,theelevatorcontrolsystemusesthestochasticlogicalwaycontrol.Atpresenttheelevatorcontrolgenerallyhasselectedtwomethods,oneisusesthemicrocomputertotakethesignalcontrolunit,completestheelevatorsignalgathering,therunningstatusandthefunctionhypothesis,realizestheelevatorautomaticdispatchandthecollectionchoosesthemovementfunction,drivesthecontroltocompletebythefrequencychangerThesecondcontrolmodePLCsubstitutesforthemicrocomputerrealizationsignalcollectionwiththeprogrammablecontrollertochoosethecontrol.Saidfromthecontrolmodeandtheperformance,thesetwomethodscertainlynottoobigdifference.Thedomesticfactorymostlychoosesthesecondway,itsreasonliesintheproductionscaleslightly,owndesignandthemanufacturemicrocomputercontroldevicecostishigherButPLCreliabilityhigh,programmingconveniencenimble,theantijammingabilitystrong,themovementstableisreliableandsoonthecharacteristic,thereforethepresentelevatorcontrolsystemwidelyusestheprogrammablecontrollertorealize.2.ElevatoridealperformancediagramIndicatedaccordingtothemassiveresearchandtheexperiment,thepersonmayacceptthemaximumaccelerationisam1.5m/s2,accelerationrateofchangerhomthe3m/s3,elevatoridealperformancediagrammaydivideaccordingtotheaccelerationisthetriangle,the无锡职业技术学院毕业设计中英文翻译3trapezoidandthesineprofile,Asaresultofsineprofileaccelerationcurverealizationmoredifficult,butthetrianglecurvemaximumaccelerationandisstartingandappliesthebrakethesectionturningpointaccelerationrateofchangetobebiggerthanthetrapezoidalcurve,namelyrhomjumpstorhomorjumpsfromrhomtorhothemaccelerationrateofchange,thereforeverylittleuses,becausethetrapezoidalcurveiseasytorealizeandhasthegoodaccelerationrateofchangefrequenttarget,thereforeiswidelyused,usesthetrapezoidalaccelerationcurveelevatoridealperformancediagramlikechart1toshowTheintelligentfrequencychangerisfortheelevatorspecialpurposefrequencychangerrequestandsoonelevatornimblevelocitymodulation,controlandhighaccuracyevenlevelwhichbutspeciallydesigns,mayuseforpartsthegeneralthreephaseasynchronousmotor,andhasfunctionandsoonintellectualizedsoftware,standardconnection,menuprompt,inputelevatorcurveandotheressentialparameter.Ithasthedebuggingconveniencequickly,moreovercanautomaticallyrealizethesinglemultilayeredfunction,andhastheautomaticoptimizationdecelerationcurvethefunction,iscomposedthevelocitymodulationsystemcrawlingtimebyitfew,theevenleveldistanceisshort,nomatteristhedoublewindingelectricmotor,or单绕组electricmotorsuitable,itshighestdesignspeedmayreach4m/s,itsuniquecomputermonitoringsoftware,maychoosetheserialinterfacerealizationinput/outputsignalthenonelectroniccontactcontrol.Thefrequencychangerconstituteselevatorsystem,whenthefrequencychangerreceivesthecontrollertosendoutshoutstheladderdirectionsignal,thefrequencychangerbasishypothesisspeedandtheaccelerationvalue,thestartingmotor,afterachievedthemaximumspeed,theuniformspeedmoves,whenarrivesthegoalleveldecelerates,thecontrollersendsoutshutsoffthehighvelocitysignal,reducesthespeedwhichthefrequencychangerestablishesthemaximumspeedtoreducetothecrawlingspeed,Indeceleratesinthemovementprocess,thefrequencychangercantheautomaticcomputationdeceleratetotheevenlevelspotbetweendistance,andcalculatestheoptimizedcurve,thuscanaccordingtotheoptimizedcurvemovement,causethelowspeedcrawlingtimetoreduceto0.3s,thefrequencychangerthroughadjustslevelingthespeedintheelevatorevenlevelprocessorappliesthebrakethepitchtoadjustlevelingtheprecision.Namelywhentheelevatorstopstooearly,thefrequencychangerincreasesthelowspeedvalueorthereductionappliesthebrakethepitchvalue,otherwisereducesthelowspeedvalueorincreasesappliesthebrakethepitchvalue,whentheelevatortoleavesevenlevelposition410cm,hastheevenlevelswitchautomaticseparationlowspeedsignal,thesystemaccordingtotheoptimizedcurverealizationhighaccuracyevenlevel,thusachievedtheevenlevelaccurateisreliable.无锡职业技术学院毕业设计中英文翻译43.ElevatorspeedcurveElevatormovementcomfortablenessisdecidedinitsmovementprocessaccelerationaandtheaccelerationrateofchangepsize,theoversizedaccelerationortheaccelerationrateofchangecancreatepassengersillfeeling.Atthesametime,forguaranteedtheelevatortheoperatingefficiency,a,thepvaluenotsuitableexcessivelyissmall.Canguaranteea,thepbestvalueelevatorperformancediagramiscalledtheelevatortheidealperformancediagram.Theelevatormovementidealcurveshouldbetheparabolastraightlinecomprehensivevelocitycurve,namelyelevatorCanada,reducestheprocessconstitutesbytheparabolaandthestraightline.Theelevatorassignsthecurveiswhetherideal,directinfluenceactualperformancediagram.3.1velocitycurveshavethemethodUsesFX264MRPLC,andaconsiderationinputoutputrequestincreasedFX8EYT,FX16EYR,theFX8EYRthreeexpansionsmodulesandtheFX240AWtwistedpairlinecorrespondenceadapter,FX240AWusesinthesystemserialcommunication.UsingPLCtheexpansionfunctionmoduleD/Amodulerealizationspeedidealcurveoutput,whenbeforehandthedigitizedidealvelocitycurvestoresthePLCregister,theproceduremovement,throughlooksupthetablewaytoreadinD/A,transformsthesimulationquantityafterD/Athespeedidealcurveoutput.3.2Accelerationassignthecurvetheproduction8D/Aoutputs05V/010V,thecorrespondingnumericalvalueis16enterssystemseveral00FF,altogether255levels.Ifelevatorrisetimebetween2.53seconds.Accordingtotheconservativevaluecomputation,intheelevatoraccelerationprocesseachtimeZhaBiaotimegapnotsuitablysurpasses10ms.Asaresultofelevatorlogiccontrolsectionprocedurebiggest,butthePLCmovementusesthecyclicalscanningmechanism,thususuallyuseslooksupthetablemethod,ZhaBiaoinstructiontimegapexcessivelyiseachtimelong,cannotsatisfiedlyassignthecurvetheprecisionrequest.InthePLCmovementprocess,itsCPUwithvariousequipmentbetweenexchangeofinformation,userprogramexecution,signalgathering,controlquantityoperationandsoonoutputallisdeferstothefixedordertocirculatethescanningwaytocarryon,eachcirculationallmustcarryontheinquiry,thejudgementandtheoperationtoallfunctions.Thiskindoforderandtheformcapablepersonarenotthechange.Theusualscanningcycle,isbasicmustcompletesixstepsthework,includingmovementsurveillance,andprogrammingexchangeinformation,anddigitalprocessorexchangeinformation,andcommunicationprocessorexchangeinformation,executionuserprogramandinputoutputconnectionservice无锡职业技术学院毕业设计中英文翻译5andsoon.Inacycle,CPUonlycarriesouttotheentireuserprogram.Thiskindofmechanismhasitsconvenientoneside,buttimelinessisbad.Theexcessivelylongscanningtime,directlyaffectsthesystemtothesignalresponseeffect,inundertheguaranteecontrolfunctionpremise,maximumlimitreducesCPUthecyclicalscanningtimeisaverycomplexquestion.Generallyonlycanshortadoptthemethodfromtheuserprogramexecutiontime.Theelevatorlogiccontrolsectionprocedurescanningtimehassurpassed10ms,althoughhasadoptedsomereducedprocedurescanningtimemeans,butstillwillbeunabletoscanthetimetofallto10msbelow.Atthesametime,appliesthebrakethesectioncurvetouseaccordingtoisawayfromtheprinciple,eachsectionofdistancesarrivetheresponsetimenotsuitablysurpasses10ms.Inordertosatisfythesystemthetimelyrequest,inthevelocitycurveproductionway,usestheseverancemethod,thuseffectivelyhasovercomethePLCscanningmechanismlimit.Thestartingaccelerationmovementbydecidesthecycleinterruptserviceisrtocomplete.Thiskindofseverancecannotcarryontheswitchbytheprocedure,onceestablishes,continuouslypressesthehypothesistimegapcirculationseverance,therefore,thestartingmovementconditionmustputintheinterruptserviceisr,whendoesnotsatisfythemovementcondition,theseverancenamelyreturns.3.2DeceleratesappliesthebrakethecurveproductionInordertoguaranteeappliesthebrakeprocesscompleting,mustcarryoninthemasterroutineappliesthebraketheconditiontojudgeandtodecelerateadetermination.Indeceleratesbeforeadetermination,theelevatorcontinuouslyisintheaccelerationorthesteadyfastmovementprocess.Theaccelerationprocesscompletesbythefixedcyclicalseverance,acceleratesafterthecorrespondingpatternmaximumvalue,theaccelerationproceduremovementconditionnolongersatisfies,aftereachtimesevers,nolongercarriesouttheaccelerationprocedure,directlyreturnsfromtheseverance.Theelevatorcorrespondsthepatternthemaximumvaluemovement,deceleratesinthispatterntoafter,hasthehighspeedcountingseverance,theexecutiondeceleratestheserviceroutine.Revisesthecounterinthisinterruptserviceisrtosupposethedefinitevaluethecondition,guaranteedthenexttimewillsevertheexecution.InthePLCinternalregister,decelerationcurvetablevaluefrombigtosmall,eachtimeseversallcarriesouttimetheindicatorneedletoadd1theoperation,thenthenextseverancewilllookupthetablenumberissmallerthanthisseverancetolookupthetablenumbers.Thegateareapeacefullevelareajudgementproducesbyexteriorsignal,guaranteesthemoderatingprocessthereliability.4.Elevatorcontrolsystem4.1Elevatorscontrolsystemcharacteristic
编号:201311171517106760    大小:82.50KB    格式:DOC    上传时间:2013-11-17
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