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Answering the question: What does "Category 3 Safety" mean?

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At a very high level, Category 3 refers to a design principle used by the engineering teams. It means that the machines are designed to not only ... Performance,Packaged SkiptoprimarynavigationSkiptomaincontentSkiptoprimarysidebarSkiptofooter Asmoreandmorecompaniesstarttolookatautomationintheirproductionlines,workeroroperatorsafetyisanimportantpartofthedecision-makingprocess. Ifyouarenewtoautomation,tryingtogainanunderstandingofwhatisincludedwithastandardmachinemaynotbeeasy. Ataveryhighlevel,Category3referstoadesignprincipleusedbytheengineeringteams.Itmeansthatthemachinesaredesignedtonotonlycheckforfaultsbutalsohaveredundantcircuitsforallsafetyfunctions. CatIIIsafetycircuitwithsafetycontroller,usingtwochannelcontroloutputsthroughthee-stopsbacktoseparatesafetyinputsonthecontroller,fortheguarddoorsweusetestoutputsthrough2channelsbacktoseparatesafetyinputsintothesafetycontroller. Takingastepback,howisthisdifferentfromCategoryB,1oreven2designcriteria? InCategoryBand1,thedesignsaredependentuponthereliabilityofthesystemorcircuitcomponents. Inotherwords,ifthesystemisundernormalconditions,thecomponentsreliabilityshouldequatetothereliabilityoftheoverallsystem. However,inthecaseofacomponentfailureorsystemfailure,itmeansthatthefailurecouldalsoaffectthesafetyfunction. Category2designcriteriaontheotherhand,requiresdetectionoffaultsatregularintervals. Asthemachinepowersupandotherpre-determinedintervalsafterthat,thereisascantoseeifanycomponentfailuresexist. Thechallengeofcourse,isthatifthereisafailureorfaultinbetweenscans,therecouldbeafaultorfailurethataffectsthesafetyfunction. Inotherwords,safetyfunctionsareagainatriskinbetweenscansforfailure. Thistypeofdesigncriteriadoesconsiderthatcomponentswillfail,anditlookstodetectthefailuresbeforeunsafeoperatingconditionshappen. Category3buildsupontheprinciplesinCategory2withthemonitoringorscanningforfaults,butitaddsredundancyaswell. Themachineisdesignedtohave2circuitstomaintainthesafetyfunctions. Thismeansthatifthereisafaultononecircuitthereisasecondarycircuittoensurethatthesafetyfunctionremainsoperationaluntilthefaultcanbedetected. Forthesafetycircuittofailcompletely,themachinewouldhavetohavefaultsonbothcircuitsinbetweenscans. Inpracticethismeansforeverydoorswitch,E-Stop,andsafetyswitcharedesignedinsuchawaythatifthereisafaultoncircuit,thereisaredundantcircuittoensurethatsafetyfunctionwillalwaysworkwhenneeded. Thisdesignprinciplealsoextendstomotionorairelements.Theytoohaveredundantcircuitstoensurethatifanoperatoractivatesasafetyfunctionthatitdoesnotfailduetoacircuitfault. Related PrimarySidebarSearch Searchthiswebsite LatestNews TheValueofProjectManagement ProMachPetfoodSolutions FromCasePackerstoPalletizers…AndSoMuchMore SupplyChainIssuesChallengingforEveryone ItisNevertooLatetoAutomate QuickLinks AbouttheAuthor Welcome,thiswebsiteisaserviceofBrentonEngineering.Browsethroughourknowledgebasetofindhelpfuleducationalinformationtomakeyournextroboticpackagingprojectasuccess. Performance,Packaged ProMachdeliversmorethanjustmachinesandsolutions–wedeliverperformancethatspansacrosseveryoneofourproductbrands.                         ExperienceOurStory–> FooterUsefulLinks Brenton ProMachInc.

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