Light curtain - Wikipedia

Light curtains are opto-electronic devices that are used to safeguard personnel in the vicinity of moving machinery with the potential to cause harm such as ... Lightcurtain FromWikipedia,thefreeencyclopedia Jumptonavigation Jumptosearch Thisarticledoesnotciteanysources.Pleasehelpimprovethisarticlebyaddingcitationstoreliablesources.Unsourcedmaterialmaybechallengedandremoved.Findsources: "Lightcurtain" – news ·newspapers ·books ·scholar ·JSTOR(September2009)(Learnhowandwhentoremovethistemplatemessage) Lightcurtainsareopto-electronicdevicesthatareusedtosafeguardpersonnelinthevicinityofmovingmachinerywiththepotentialtocauseharmsuchaspresses,windersandpalletisers.Lightcurtainscanbeusedasanalternativetomechanicalbarriersandotherformsoftraditionalmachineguarding.Byreducingtheneedforphysicalguardsandbarriers,lightcurtainscanincreasethemaintainabilityoftheequipmenttheyareguarding.Theoperabilityandefficiencyofmachinerycanalsobeimprovedbytheuseoflightcurtainsby,forexample,allowingeasieraccessforsemi-automaticprocedures. Description[edit] Lightcurtainsfallintoacategoryofequipmentknownaspresencedetectiondevices.Othercommonpresencedetectiondevicesarepressure-sensitivesafetymatsandlaserscanners(oftenusedonRemotelyOperatedVehicles(ROV)wheninindustrialsettings).Mostimportantapplicationsofsafetyrelaysareinautomationindustriesdealingwithroboticcellsetup. Lightcurtainsaresuppliedasapairwithatransmitterandreceiver.Thetransmitterprojectsanarrayofparallelinfraredlightbeamstothereceiverwhichconsistsofanumberofphotoelectriccells.Whenanobjectbreaksoneormoreofthebeamsastopsignalissenttotheguardedequipmentmachine. Thelightbeamsemittedfromthetransmitteraresequenced,oneaftertheother,andpulsedataspecificfrequency.Thereceiverisdesignedtoonlyacceptthespecificpulseandfrequencyfromitsdedicatedtransmitter.Thisenablestherejectionofspuriousinfraredlightandthusenhancestheirsuitabilityascomponentswithinasafetysystem. Typically,lightcurtainsareconnectedtoasafetyrelaywhichwillremovemotivepowerfromthehazardintheeventthatanobjectisdetected.Safetyrelayscanbeprovidedwithmutingfunctionalitywhichenablesthetemporarydisablingofthesafetyfunctiontoallowobjectstopassthroughthelightcurtainswithouttrippingthesafetyrelay.Thisisparticularlyusefulformachinerywhichhassomesemi-automaticprocedures. Standards[edit] Thefollowingpartiallistofstandardsshouldbeusedforguidancewhenimplementinglightcurtains: ANSIB11.19 IEC61496-1/-2 IEC/TS62046; ISO13855(EN999); Retrievedfrom"https://en.wikipedia.org/w/index.php?title=Light_curtain&oldid=1012783390" Categories:OccupationalsafetyandhealthSafetyequipmentHiddencategories:ArticleslackingsourcesfromSeptember2009Allarticleslackingsources Navigationmenu Personaltools NotloggedinTalkContributionsCreateaccountLogin Namespaces ArticleTalk English Views ReadEditViewhistory More Search Navigation MainpageContentsCurrenteventsRandomarticleAboutWikipediaContactusDonate Contribute HelpLearntoeditCommunityportalRecentchangesUploadfile Tools WhatlinkshereRelatedchangesUploadfileSpecialpagesPermanentlinkPageinformationCitethispageWikidataitem Print/export DownloadasPDFPrintableversion Languages DeutschSlovenščinaSuomi中文 Editlinks