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外文翻译--PLC控制下的电梯系统.doc

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外文翻译--PLC控制下的电梯系统.doc

ElevatorSystemBasedonPLCComposedbytheorderofrelaycontrolsystemisarealizationofthefirstelevatorcontrolmethod.However,toenterthenineties,withthedevelopmentofscienceandtechnologyandthewidespreadapplicationofcomputertechnology,thesafetyofelevators,reliabilityoftheincreasinglyhighdemandontherelaycontrolweaknessesarebecomingevident.Elevatorcontrolsystemrelaysthefailureratehigh,greatlyreducesthereliabilityandsafetyofelevators,andescalatorsstoppedoftentotakewiththestaffabouttheinconvenienceandfear.Andtheeventratherthantakingtheliftorsquatattheendoftheliftwillnotonlycausedamagetomechanicalcomponents,butalsopersonalaccidentmayoccur.ProgrammableLogicControllerPLCisthefirstorderlogiccontrolinaccordancewiththeneedsofdevelopedspecificallyforindustrialenvironmentapplicationstooperatetheelectronicdigitalcomputingdevice.Givenitsadvantages,atpresent,therelaycontrolthelifthasbeengraduallyreplacedbyPLCcontrol.Atthesametime,ACvariablefrequencymotorspeedcontroltechnology,thewaytheliftdragspeedhasbeenagradualtransitionfromDCtoACfrequencyconverter.Thus,PLCcontroltechnologyincreasesVVVFElevatormoderntechnologyhasbecomeahotindustry.1.PLCelevatorcontroladvantages1usedinelevatorcontrolPLC,withsoftwareforautomaticcontrolofliftoperation,reliabilitygreatlyincreased.2layerwasremovedandamajorityoftherelay,thecontrolsystemstructureissimple,tosimplifytheexternalcircuit.3PLCcanbeavarietyofcomplexcontrolsystem,easytoaddorchangecontrolfunctions.4PLCcanbeautomatedfaultdetectionandalarmdisplaytoimprovetheoperationofsecurityandeaseofmaintenance.5forthegroupcontroltheallocationandmanagement,andimprovetheefficiencyofelevatoroperation.6donotneedtochangethecontrolschemechangeswhenthehardwareconnection.2.VVVFelevatorcontrolcharacteristicsWiththepowerelectronics,microelectronicsandcomputertechnologytocontroltherapiddevelopmentoftechnology,communicationtechnologyVVVFalsoaveryrapidrate.ACvariablefrequencymotorspeedcontroltechnologyisthepowertoimprovetheprocessinordertoimproveproductqualityandimprovingtheenvironmentandpromotingtechnologicalprogressasaprimarymeans.Frequencyofitsexcellentperformanceandthespeedbrakefromasmoothperformance,highefficiency,highpowerfactorandpowersavingeffectofabroadscopeofapplicationandmanyotheradvantagesofbeingathomeandabroadrecognizedasthemostpromisingapproachspeedExchangecharacteristicsofVVVFElevator1lowenergyconsumption2lowloadcircuit,therequiredemergencypowersupplydeviceofsmallIntheaccelerationstage,therequiredstartupcurrentoflessthan2.5timestheratedcurrent.Peakstartingcurrentandtimeisshort.Sincethestartingcurrentisdrasticallyreduced,sopowerconsumptionandpowersupplycablediametercanbereducedalot.Requiredforemergencypowersupplydevicesarealsorelativelysmallsize.3highreliabilityandlongservicelife.4goodcomfortElevatoroperationisbesttofollowthespeedcurveofagivenoperation.Theircharacteristicscanbeadaptedtohumanfeelings,andtoensurethatnoiseoperation,smoothbrakePinglayerandhighprecision5Stablenoisefree6Inthecar,theengineroomandadjacentareastoensurethatnoise.Becausetheirsystemsuseahighclockfrequency.Alwaysproduceatruesinewavepowersupplycurrentyet.Motortorquerippledoesnotappear.Therefore,toeliminatevibrationandnoise.3.ElevatorcontroltechnologyThesocalledelevatorcontroltechnologyreferstotheelevatordrivesystemandelectricalcontrolsystemofautomaticcontrol.70asthe20thcenturyinChinaselevatorwasmarkedbytheexchangeoftwospeedelevator.Itsspeedisusedtochangetheelevatortractionmotoroftheveryfew,twoormultilevelapproachtothenumberofwindings,veryfewofthemashighspeedwindingofthewinding,averyfewnumberofwindingsasthelowspeedwinding.Windingsforhighspeedelevatorspeedstartupandrunning,lowspeedwindingsforbrakingandthemaintenanceofelevators.Theearly80s,VVVFinvertercontrolledvariableliftsystemavailable.ItusesACmotordrives,areabletoreachthelevelofDCmotor,controlthespeedofthecurrenthasreached6m/sec.Itssmallsize,lightweight,highefficiency,energysaving,includingthepastalmostalltheadvantagesofthelift.Isthelatestelevatordrivesystem.Operationinverticallift,thereisalsothestartingpointoftheterminusstation.Formorethanthreestoryelevatorbuildings,thestartingpointoftheterminalstationsandstopsbetweenthehadnot,thestartingpointforthesestationsatthefirstflooroftheterminallocatedatthehighestfloor.Startingpointinthefirstfloorofthestationknownasbasestations,knownasthestartingpointatbothendsoftheterminalstationsandstationsatbothendsofintermediatestopsbetweenstations.Outsidethestationhasacallbox,boxsetareusedbystaffforelevatorcallbuttonortouchthecallbutton,thegeneralendsoftheliftstationsinthecallboxontheSettingsbuttonortouchofabutton.Middlelayerofthestationsetupthecallboxbuttonortouchbutton2.Nodriversforthecontrolofelevators,atvariousstationsaresetupcallsmeonabuttonortouchbutton.Elevatorcarandtheinternalsettingsexceptfordebriselevatortomanipulateme.Controlboxswitchonthehandleorsetupstationsandthecorrespondinglayerofbuttonsortouchbuttoncontrolboxonthetouchcontrolbuttonorcommandbuttonortouchthecitybutton.Outsidethecommandbuttonortouchbuttonissueasthesignaloutsidethecommandsignal,withinthecommandbuttonortouchbuttonissuewithinthesignalasacommandsignal.80Inthemid20thcentury,thetouchbuttonhasbeenreplacedbymicrobutton.Astheelevatorcallboxoutsidethebasestation,inadditiontosetupacallbuttonortouchbutton,butalsosetakeyswitchinordertoworktheelevatorclearance.Driversormanagementstafftoopentheelevatortothebasestationcanwrigglethroughadedicatedkeytothekeyswitch.Closetheelevatorinplacetoautomaticallycutofftheelevatorcontrolpowersupplyorpowersupply.4.PLCControlElevatorDesignWiththecontinuousdevelopmentofurbanconstruction,theincreasinghighrisebuildings,elevatorsandlifeinthenationaleconomyhasabroadapplication.Elevatorhighrisebuildingsasameansoftransportintheverticalrunofdailylifehasbeeninextricablylinkedwithpeople.Infacttheliftisbasedonexternalcallcontrolsignals,aswellasthelawsoftheirown,suchasrunning,andthecallisrandom,theliftisactuallyamanmachineinteractivecontrolsystem,simpletousecontrolorlogiccontrolordercannotmeetthecontrolrequirements,andtherefore,elevatorcontrolsystemusesarandomcontrollogic.Elevatorcontroliscurrentlygenerallyusedintwoways,first,theuseofcomputerasasignalcontrolunit,thecompletionoftheliftsignalacquisition,operationandfunctionoftheset,toachievetheliftandsettheautomaticschedulingfunctiontoruntheelection,dragthecontrolfrominvertertocompletethesecondcontrolmodewithprogrammablelogiccontrollerPLCtoreplacethecomputercontrolsignalsetstheelection.Fromthecontrolandperformance,thesetwotypesofmethodsandthereisnosignificantdifference.Mostofthedomesticmanufacturerstochoosethesecondapproach,becausethesmallerscaleofproduction,theirdesignandmanufactureofhighcostofcomputercontroldevicesandPLChighreliability,convenientandflexibleprogramdesign,antiinterferenceability,stableandreliableoperationofthecharacteristicsofTherefore,theelevatorcontrolsystemisnowwidelyusedtorealizeprogrammablecontroller.5.ElevatorcontrolsystemcharacteristicsOperationoftheliftcurveisabovethestarttoruncomfortindicatorsliftthekeyfeatures,andcomfortaredirectlyrelatedwiththeacceleration,accordingtocontroltheory,foracertainamountofchangeaccordingtothelawmustbedirectlycontrolled,forelevatorcontrolsystem,accordingtotheidealaccelerationcurveaccelerationfeedbacktobeused,inaccordancewiththemotortorqueequationMMZΔMJdn/dt,canbeseenreflectedintherateofchangeofaccelerationofthesystemofdynamictorquechangesonthecontrolsystemtocontroltheaccelerationofthedynamictorqueΔMMMZ.Therefore,duringthistimetocontroltheuseoftheprincipleofacceleration,whenthestartrateofincreaseinsteadystatevalueabove90,theaccelerationcontrolsystembytheswitchtospeedcontrol,asinparagraphsteadyspeed,speedcontrolfortheconstantfluctuationsinthesmaller,littlechangeinacceleration,speedandtheuseofclosedloopcontrolcanmaintainasteadystatespeedaccuracyandprecisionforthebrakingsectiontocreatetheconditionspinglayer.Isrisingatarateinthesystem,andalthoughtheabovespeedPIregulatorusedtocontrol,buttwoofthePIparametersaredifferentinordertoimprovethesystemdynamicresponseindicators.Thebrakeinthesystem,

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