基于PLC的电梯控制系统设计中英文翻译.docx

基于PLC的电梯控制系统设计中英文翻译.docx

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基于PLC的电梯控制系统设计中英文翻译

ElevatorSystemBasedonPLC

Composedbytheorderofrelaycontrolsystemisarealizationofthefirstelevatorcontrolmethod.However,toenterthenineties,withthedevelopmentofscienceandtechnologyandthewidespreadapplicationofcomputertechnology,thesafetyofelevators,reliabilityoftheincreasinglyhighdemandontherelaycontrolweaknessesarebecomingevident.

Elevatorcontrolsystemrelaysthefailureratehigh,greatlyreducesthereliabilityandsafetyofelevators,andescalatorsstoppedoftentotakewiththestaffabouttheinconvenienceandfear.Andtheeventratherthantakingtheliftorsquatattheendoftheliftwillnotonlycausedamagetomechanicalcomponents,butalsopersonalaccidentmayoccur.

ProgrammableLogicController（PLC）isthefirstorderlogiccontrolinaccordancewiththeneedsofdevelopedspecificallyforindustrialenvironmentapplicationstooperatetheelectronicdigitalcomputingdevice.Givenitsadvantages,atpresent,therelaycontrolthelifthasbeengraduallyreplacedbyPLCcontrol.Atthesametime,ACvariablefrequencymotorspeedcontroltechnology,thewaytheliftdragspeedhasbeenagradualtransitionformDCtoACfrequencyconverter.Thus,PLCcontroltechnologyincreasesVVVFElevatormoderntechnologyhasbecomeahotindustry.

1.PLCelevatorcontroladvantages:

（1）UsedinelevatorcontrolPLC,withsowareforautomaticcontrolofliftoperation,reliabilitygreatlyincreased.

（2）Layerwasremovedandmajorityoftherelay,thecontrolsystemstructureissimple,simplifytheexternalcircuit.

（3）PLCcanbeavarietyofcomplexcontrolsystem,easytoaddorchangecontrolfunctions.

（4）PLCcanbeautomatedfaultdetectionandalarmdisplaytoimprovetheoperationofsecurityandeaseofmaintenance.

（5）Forthegroupcontroltheallocationandmanagement,andimprovetheefficiencyofelevatoroperation.

（6）Donotneedtochangethecontrolschemechangeswhenthehardwareconnection.

2.VVVFelevatorcontrolcharacteristics.

Withthepowerelectronics,microelectronicsandcomputertechnologytocontroltherapiddevelopmentoftechnology,communicationtechnologyVVVFalsoaveryrapidrate.ACvariablefrequencymotorspeedcontroltechnologyisthepowertoimprovetheprocessinordertoimproveproductqualityandimprovingtheenvironmentandpromotingtechnologicalprogressasaprimarymeans.Frequencyofitsexcellentperformanceandthespeedbrakefromasmoothperformance,highefficiency,highpowerfactorandpower-savingofabroadscopeofapplicationandmanyotheradvantagesofbeingathomeandabroadrecognizedasthemostpromisingapproachspeed.

ExchangecharacteristicsofVVVFElevator:

（1）lowenergyconsumption.

（2）lowloadcircuit,thereemergencypowersupplydeviceofsmall.

Intheaccelerationstage,therequiredstart-upcurrentoflessthan2.5timestheratedcurrent.Peakstartingcurrentandtimeisshort.Sincethestartingcurrentisdrasticallyreduced,sopowerconsumptionandpowersupplycablediametercanbereducedalot.Requiredforemergencypowersupplydevicesarealsorelativelysmallsize.

（3）highreliabilityandlongservicelife.

（4）goodcomfort.

Elevatoroperationisbesttofollowthespeedcurveofagivenoperation.Theircharacteristicscanbeadaptedtohumanfeelings,andtoensurethatnoiseoperation,smoothbrakePinglayerandhighprecision.

（5）stablenoise-free.

（6）Inthecar,theengineroomandadjacentareastoensurethatnoise.Becausetheirsystemsuseahighclockfrequency.Alwaysproduceatruesinewavepowersupplycurrentyet.Motortorquerippledoesnotappear.Therefore,toeliminatevibrationandnoise.

3.Elevatorcontroltechnology.

Theso-calledelevatorcontroltechnologyreferstotheelevatordrivesystemandelectricalcontrolsystemofautomaticcontrol.70asthe20thcenturyinChina’selevatorweremarkedbytheexchangeoftwo-speedelevator.Itsspeedisusedtochangetheelevatortractionmotoroftheveryfew,twoormute-levelapproachtothenumberofwindings,veryfewofthemashigh-speedwindingofthewinding,averyfewnumberofwindingsasthelow-speedwinding.Windingsforhigh-speedelevator-speedstart-upandrunning,low-speedwindingsforbrakingandthemaintenanceofelevators.

Theearly80s,VVVFinvertercontrolledvariableliftsystemavailable.ItusesACmotordrivers,areabletoreachthelevelofDCmotor,controlthespeedofthecurrenthasreached6m/sec.Itssmallsize,lightweight,highefficiency,energysaving,inc1udingthepastalmostalltheadvantagesofthelift.Isthelatestelevatordrivesystem

Operationinverticallift,thereisalsothestartingpointoftheterminusstation.Formorethanthree-storyelevatorbuildings,thestartingpointoftheterminalstationsandstopsbetweenthehadnot,thestartingpointforthesestationsatthefirstflooroftheterminallocatedatthehighestfloor.Startingpointinthefirstfloorofthestationknownasbasestations,knownasthestartingpointatbothendsoftheterminalstationsandstationsatbothendsofintermediatestopsbetweenstations.

Outsidethestationhasacallbox,boxsetareusedbystaffforelevatorcallbuttonortouchthecallbutton,thegeneralendsoftheliftstationsinthecallboxontheSettingsbuttonortouchofabutton.1iddlelayerofthestationsetupthecallboxbuttonortouchbutton2.Nodriversforthecontrolofelevators,atvariousstationsaresetupcallsmeonabuttonortouchbutton.Elevatorcarandtheinternalsettings（exceptfordebriselevator）tomanipulateme.Controlboxswitchonthehandleorsetupstationsandthecorrespondinglayerofbuttonsortouch-buttoncontrolboxonthetouch-controlbuttonorcommandbuttonortouchthecitybutton.Outsidethecommandbuttonortouch-buttonissueasthesignaloutsidethecommandsignal,withinthecommandbuttonortouch-buttonissuewithinthesignalasacommandsignal.80Inthemid-20thcentury,thetouchbuttonhasbeenreplacedbymicro-button.

Astheelevatorcallboxoutsidethebasestation,inadditiontosetupacallbuttonortouchbutton,buta1sosetakeyswitchinordertoworktheelevatorclearance.Driversormanagementstafftoopentheelevatortothebasestationcanwrigglethroughadedicatedkeytothekeyswitch.Closetheelevatorinplacetoautocraticallycutofftheelevatorcontrolpowersupplyorpowersupply.

4.PLCControlElevatorDesign.

Withthecontinuousdevelopmentofurbanconstruction,theincreasinghigh-risebuildings,elevatorsandlifeinthenationaleconomyhasabroadapplication.Elevatorhigh-risebuildingsasameansoftransportintheverticalrunofdailylifehavebeeninextricablylinkedwithpeople.Infacttheliftisbasedonexternalcallcontrolsignals,aswellasthelawsoftheirown,suchasrunning,andthecal1israndom,theliftisactuallyaman-machineinteractivecontrolsystem,simpletousecontrolorlogiccontrolordercannotmeetthecontrolrequirement,andtherefore,elevatorcontrolsystemusesarandomcontrollogic.Elevatorcontroliscurrent1ygenerallyusedintwoways,first,theuseofcomputerasasignalcontrolunit,thecompletionoftheliftsignalacquisition,operationandfunctionofthese,toachievetheliftandsettheautocraticschedulingfunctiontoruntheelection,dragthecontrolfrominvertertocomplete;thesecondcontrolmodewithprogrammablelogiccontroller（PLC）toreplacethecomputercontrolsignalsetstheelection.Fromthecontrolandperformance,thesetwotypesofmethodsandthereisnosignificantdifference.Mostofthedomesticmanufacturerstochoosethesecondapproach,becausethesmallerscaleofproductiontheredesignandmanufactureofhighcostofcomputercontroldevices;andPLChighreliabi1ity,convenientandflexibleprogramdesign,anti-interferenceability,stableandreliableoperationofthecharacteristicsofTherefore,theelevatorcontrolsystemisnowwidelyusedtorealizeprogrammablecontrol.

5.Liftcontrolsystem.

Liftcontrolsystemisusedtomanipulateeachcontrolprocessbymanagingsuchcommandsasrunningdirection,carcall,landingcall,loadsignal,landingindication,safetyprotection.

Liftsindifferentapplicationshavedifferentload,speedanddrive/controlmodes.Liftsinsameapplicationmayalsohavedifferentcontrolmode.Whatevercontrolmodeisadopted,theobjectiveisthesame,tobespecific,accordingtocarcallandlandingcall,liftcontrolsystemwillexecuteautomaticlogicjudgmenttodeterminewhichliftwillreceivesignal,whichdirectionliftwillruntowardsandcompleteprogrammedcontrolobjectivethroughelectricalautomaticsystembasedoncommand.

Typesofliftcontrolsystem.

Controlsystemdevelopmentchronicleindicatesthattherehasappearedmanycontrolmodes,suchassuchasrelaycontrol,PLC,singlecomputercontrol,multiple-computercontrol.Prevailingindifferentera,thesecontrolmodesarestillemployedinliftsnowduetomassiveintegratedcircuitandcomputertechnologydevelopment.

PLCcontrolsystem.

Asabbreviationofprogrammablelogiccontroller,PLCisanelectronicsystemfeaturingdigitalcomputation.ItadoptsprogrammableEPROMtoexecutelogiccomputation,ordercontrol,timing,numbercounting,arithmeticcomputation,besides,itcaninputandoutputthroughdigitaloranalogymodes.

ThemechanismofPLCcontrolisasfollows:

inputofPLCincludessuchcommandsignals,aspowerkeytohomelanding,carcall,landingcall,varioussafetyswitches,positionsignal,whileoutputofPLCincludescontactor,relay,indicatorsofcar/landingsandcommunicationunitary,indicatorsinsidecarandswitch,positionsignal,areinpu