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1、翻譯部分英文原文DesignandPracticeofanElevatorControlSystemBasedonPLCAbstractThispaperdescribesthedevelopmentof2nine-storeyelevatorscontrolsystemforaresidentialbuilding.ThecontrolsystemadoptsPLCascontroller,andusesaparallelconnectiondispatchingrulebasedon"minimumwaitingtime"torun
2、2elevatorsinparallelmode.Thepapergivesthebasicstructure,controlprincipleandrealizationmethodofthePLCcontrolsystemindetail.Italsopresentstheladderdiagramofthekeyaspectsofthesystem.Thesystemhassimpleperipheralcircuitandtheoperationresultshowedthatitenhancedthereliabilityan
3、dperformanceoftheelevators.1.IntroductionWiththedevelopmentofarchitecturetechnology,thebuildingistallerandtallerandelevatorsbecomeimportantverticaltransportationvehiclesinhigh-risebuildings.Theyareresponsibletotransportpassengers,living,workingorvisitinginthebuilding,com
4、fortableandefficientlytotheirdestinations.Sotheelevatorcontrolsystemisessentialinthesmoothandsafeoperationofeachelevator.Ittellstheelevatorinwhatordertostopatfloors,whentoopenorclosethedoorandifthereisasafety-criticalissue.Thetraditionalelectricalcontrolsystemofelevators
5、isarelay-controlledsystem.Ithasthedisadvantagessuchascomplicatedcircuits,highfaultratioandpoordependability;andgreatlyaffectstheelevator’srunningquality.Therefore,entrustedbyanenterprise,wehaveimprovedelectricalcontrolsystemofarelay-controlledelevatorinaresidentialbuildi
6、ngbyusingPLC.Theresultshowedthatthereformedsystemisreliableinoperationandeasyformaintenance.Thispaperintroducesthebasicstructure,controlprincipleandrealizationmethodoftheelevatorPLCcontrolsystemindetail.2.SystemstructureThepurposeoftheelevatorcontrolsystemistomanagemovem
7、entofanelevatorinresponsetouser’srequests.Itismainlycomposedof2parts:2.1.ElectricpowerdrivingsystemTheelectricpowerdrivingsystemincludes:theelevatorcar,thetraction24motor,doormotor,brakemechanismandrelevantswitchcircuits.HereweadoptedanewtypeofLCseriesACcontactorstorepla
8、cetheoldones,andusedPLC’scontactstosubstitutetheplentyofintermediaterelays.Thecircuitsoftractionmotorar
