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1、四层杂物电梯PLC控制外文翻译Abstractmicroelectronictechnology'sdevelopment,elevator'sdraggingwayandthecontrolmethodhashadtheverybigchange,theexchangevelocitymodulationisthecurrentelevatordraggingmaindevelopmentdirection.Atpresenttheliftcontrolsystemmainlyhasthreecontrolmodes:Followingelectriccircuitcon
2、trolsystem(“earlyinstallmentelevatormanyblack-whitecontrolsystem),PLCcontrolsystem,microcomputercontrolsystem.Becausetheblack-whitecontrolsystemthefailurerateishigh,thereliabilityisbad,controlmodenotnimbleaswellasconsumedpowerbigandsoonshortcomings,atpresenthasbeeneliminatedgradually.Altho
3、ughthemicrocomputercontrolsystemhasthestrongfunctionintheintelligentcontrolaspect,butalsohastheinterferencerejectiontobebad,thesystemdesigniscomplex,generallytheservicemenmasterflawswithdifficultyandsoonitsservicetechnology.ButPLCcontrolsystem,becausemovesthereliabilitytobehigh,theuseservi
4、ceisconvenient,anti-jamming,thedesignandthedebuggingcycleisshortandsoonmerits,timeistakenseriouslythepeopleandsoonmerits,havebecomepresentusemostcontrolmodesintheliftcontrolsystem,atpresentalsowidelyuseinthetraditionblack-whitecontrolsystem'stechnologicaltransformations.Theoriginanddevelop
5、mentoftheelevatorElevatorintheChinesedictionaryexplanation:buildingelectricitypoweredlift,insteadofwalkingupanddownthestairs.Whenitcomestoliftfromtheoriginofthe2600BCEgyptiansbuiltinPyramidusingtheoriginalliftingsystemtostart,butthiskindofcraneenergyarehuman.By1203,twoFrenchmonasteryinstal
6、ledacrane,thedifferenceisjustthemachineistheuseofdonkeyaspower,loadbyaroundalargedrumropeforhoisting.ThismethodhasbeenusedtomodernuntilWattinventedthesteamengine,inabout1800,mineownerscanusethecranetomineincoaltransportation.Forhundredsofyears,peoplemadevarioustypesofelevators,theyallhavea
7、commondefect:aslongastheliftingropesnaps,liftingladderherapidlyhitbottomlayer.1854Otisdesignabrake:intheliftplatformmountedontopofatruckwithaspringandabrakeleverandLiftWellsRoadonbothsidesoftheguiderailisconnectedwiththeliftingrope,wagonsprings,thisisonlytheli
