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1、ElevatorSystemBasedonPLCComposedbytheorderofrelaycontrolsystemisarealizationofthefirstelevatorcontrolmethod.However,toenterthenineties,withthedevelopmentofscienceandtechnologyandthewidespreadapplicationofcomputertechnology,thesafetyofelevators,reliabilityoftheincreasinglyhighdemandontherelaycontrolw
2、eaknessesarebecomingevident.Elevatorcontrolsystemrelaysthefailureratehigh,greatlyreducesthereliabilityandsafetyofelevators,andescalatorsstoppedoftentotakewiththestaffabouttheinconvenienceandfear.Andtheeventratherthantakingtheliftorsquatattheendoftheliftwillnotonlycausedamagetomechanicalcomponents,bu
3、talsopersonalaccidentmayoccur.ProgrammableLogicController(PLC)isthefirstorderlogiccontrolinaccordancewiththeneedsofdevelopedspecificallyforindustrialenvironmentapplicationstooperatetheelectronicdigitalcomputingdevice.Givenitsadvantages,atpresent,therelaycontrolthelifthasbeengraduallyreplacedbyPLCcon
4、trol.Atthesametime,ACvariablefrequencymotorspeedcontroltechnology,thewaytheliftdragspeedhasbeenagradualtransitionformDCtoACfrequencyconverter.Thus,PLCcontroltechnologyincreasesVVVFElevatormoderntechnologyhasbecomeahotindustry.1. PLCelevatorcontroladvantages:(1) UsedinelevatorcontrolPLC,withsowarefor
5、automaticcontrolofliftoperation,reliabilitygreatlyincreased.(2) Layerwasremovedandmajorityoftherelay,thecontrolsystemstructureissimple,simplifytheexternalcircuit.(3) PLCcanbeavarietyofcomplexcontrolsystem,easytoaddorchangecontrolfunctions.(4) PLCcanbeautomatedfaultdetectionandalarmdisplaytoimproveth
6、eoperationofsecurityandeaseofmaintenance.(5) Forthegroupcontroltheallocationandmanagement,andimprovetheefficiencyofelevatoroperation.可编辑(6)Donotneedtochangethecontrolschemechangeswhenthehardwareconnection.(1) VVVFelevatorcontrolcharacteristics.Withthepowerelectronics,microelectronicsandcomputertechn
7、ologytocontroltherapiddevelopmentoftechnology,communicationtechnologyVVVFalsoaveryrapidrate.ACvariablefrequencymotorspeedcontroltechnologyisthepowertoimprovetheprocessinordertoimproveproductqualityandimprovingtheenvironmentandpromotingtechnologicalprogressasaprimarymeans.Frequencyofitsexcellentperfo
8、rmanceandthespeedbrakefromasmoothperformance,highefficiency,highpowerfactorandpowersavingofabroadscopeofapplicationandmanyotheradvantagesofbeingathomeandabroadrecognizedasthemostpromisingapproachspeed.ExchangecharacteristicsofVVVFElevator:(2) lowenergyconsumption.(3) lowloadcircuit,thereemergencypow
9、ersupplydeviceofsmall.Intheaccelerationstage,therequiredstart-upcurrentoflessthan2.5timestheratedcurrent.Peakstartingcurrentandtimeisshort.Sincethestartingcurrentisdrasticallyreduced,sopowerconsumptionandpowersupplycablediametercanbereducedalot.Requiredforemergencypowersupplydevicesarealsorelatively
10、smallsize.(4) highreliabilityandlongservicelife.(5) goodcomfort.Elevatoroperationisbesttofollowthespeedcurveofagivenoperation.Theircharacteristicscanbeadaptedtohumanfeelings,andtoensurethatnoiseoperation,smoothbrakePinglayerandhighprecision.(6) stablenoise-free.(7) Inthecar,theengineroomandadjacenta
11、reastoensurethatnoise.Becausetheirsystemsuseahighclockfrequency.Alwaysproduceatruesinewavepowersupplycurrentyet.Motortorquerippledoesnotappear.Therefore,toeliminatevibrationandnoise.3. Elevatorcontroltechnology.可编辑Theso-calledelevatorcontroltechnologyreferstotheelevatordrivesystemandelectricalcontro
12、lsystemofautomaticcontrol.70asthe20thcenturyinChinaselevatorweremarkedbytheexchangeoftwo-speedelevator.Itsspeedisusedtochangetheelevatortractionmotoroftheveryfew,twoormute-levelapproachtothenumberofwindings,veryfewofthemashigh-speedwindingofthewinding,averyfewnumberofwindingsasthelow-speedwinding.Wi
13、ndingsforhigh-speedelevator-speedstart-upandrunning,low-speedwindingsforbrakingandthemaintenanceofelevators.Theearly80s,VWFinvertercontrolledvariableliftsystemavailable.ItusesACmotordrivers,areabletoreachthelevelofDCmotor,controlthespeedofthecurrenthasreached6m/sec.Itssmallsize,lightweight,higheffic
14、iency,energysaving,includingthepastalmostalltheadvantagesofthelift.IsthelatestelevatordrivesystemOperationinverticallift,thereisalsothestartingpointoftheterminusstation.Formorethanthree-storyelevatorbuildings,thestartingpointoftheterminalstationsandstopsbetweenthehadnot,thestartingpointforthesestati
15、onsatthefirstflooroftheterminallocatedatthehighestfloor.Startingpointinthefirstfloorofthestationknownasbasestations,knownasthestartingpointatbothendsoftheterminalstationsandstationsatbothendsofintermediatestopsbetweenstations.Outsidethestationhasacallbox,boxsetareusedbystaffforelevatorcallbuttonorto
16、uchthecallbutton,thegeneralendsoftheliftstationsinthecallboxontheSettingsbuttonortouchofabutton,liddlelayerofthestationsetupthecallboxbuttonortouchbutton2.Nodriversforthecontrolofelevators,atvariousstationsaresetupcallsmeonabuttonortouchbutton.Elevatorcarandtheinternalsettings(exceptfordebriselevator)tomanipulateme.Controlboxswitchonthehandleorsetupstationsandthecorrespondinglayerofbuttonsortouch-buttoncontrolboxonthetouch-controlbutton
