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1、ElevatorSystemBasedonPLCComposedbytheorderofrelaycontrolsystemisarealizationofthefirstelevatorcontrolmethod.However,toenterthenineties,withthedevelopmentofscienceandtechnologyandthewidespreadapplicationofcomputertechnology,thesafetyofelevators,reliabilityoftheincreasingly
2、highdemandontherelaycontrolweaknessesarebecomingevident.Elevatorcontrolsystemrelaysthefailureratehigh,greatlyreducesthereliabilityandsafetyofelevators,andescalatorsstoppedoftentotakewiththestaffabouttheinconvenienceandfear.Andtheeventratherthantakingtheliftorsquatattheend
3、oftheliftwillnotonlycausedamagetomechanicalcomponents,butalsopersonalaccidentmayoccur.ProgrammableLogicController(PLC)isthefirstorderlogiccontrolinaccordancewiththeneedsofdevelopedspecificallyforindustrialenvironmentapplicationstooperatetheelectronicdigitalcomputingdevice
4、.Givenitsadvantages,atpresent,therelaycontrolthelifthasbeengraduallyreplacedbyPLCcontrol.Atthesametime,ACvariablefrequencymotorspeedcontroltechnology,thewaytheliftdragspeedhasbeenagradualtransitionformDCtoACfrequencyconverter.Thus,PLCcontroltechnologyincreasesVVVFElevator
5、moderntechnologyhasbecomeahotindustry.1.PLCelevatorcontroladvantages:(1)UsedinelevatorcontrolPLC,withsowareforautomaticcontrolofliftoperation,reliabilitygreatlyincreased.(2)Layerwasremovedandmajorityoftherelay,thecontrolsystemstructureissimple,simplifytheexternalcircuit.(
6、3)PLCcanbeavarietyofcomplexcontrolsystem,easytoaddorchangecontrolfunctions.(4)PLCcanbeautomatedfaultdetectionandalarmdisplaytoimprovetheoperationofsecurityandeaseofmaintenance.(5)Forthegroupcontroltheallocationandmanagement,andimprovetheefficiencyofelevatoroperation.(6)Do
7、notneedtochangethecontrolschemechangeswhenthehardwareconnection.2.VVVFelevatorcontrolcharacteristics.8Withthepowerelectronics,microelectronicsandcomputertechnologytocontroltherapiddevelopmentoftechnology,communicationtechnologyVVVFalsoaveryrapidrate.ACvariablefrequencymot
8、orspeedcontroltechnologyisthepowertoimprovetheprocessinordertoimproveproductqualityandimprovingt
