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IntroductionGeneralindexIncrementalEncodersGeneralDescription2EL30E-H-I5IncrementalEncodersEH38A-B-D7EH-EL40A-B-C-E9EH-EL40G-H-I11EH-EL58B-C-H-T15EH-EL63A-D-E17EH-EL63F-G-P19EH-EL72A-B21EH-EL53A-BEH-EL90/115A-R23EX80A-D25RH-RM200/500A-B-C29ERA31EVA-B33EF36K35EC34AFlameproofincrementalencodersIncrementalencoderforracksMetricwheelsIncrementallinearsystemElectronichandwheelIncrementalencoderswithcommutationphases(Halltype)EL-EF-EW48C-P37AbsoluteEncodersEA50AEA63A-B-C-D-GEA90/115A45AbsoluteencodersEZ63A-B-C-D-GEA90/115A49AbsoluteencoderswithincrementaltransmissionAbsoluteencodersforturrettoolchangeEA40T-U53OtherProductsEPA-B5557RotationalPotentiometerInterfaceboardsEMDEMB59JointsAccessoriesConnectionsandoutputstagesforincrementalandabsoluteencoders631327IndexEL-EF49C-P39EL-EF80C-P41GeneralDescription43Useprecautions6261Edition2001Theencoderisarotationaltransducertoconvertanangularmovementintoaseriesofelectricaldigitalimpulses.Thesegeneratedimpulsescanbeusedtocontrolangularorlinearmovements,iftheyareassociatedwitharackorendlessscrews.Theelectricalsignalsduringrotationcanbeelaboratedbynumericalcontrols(CNC),programmablelogiccontrols(PLC),controlsystems,etc.Themainapplicationsofthesetransducersareasfollows:machinetools,workingofthematerial,robots,retroactionsystemsonmotors,measuramentandcontrolapparatus.InELTRA’sencoderstheangularmovementtrasductioniscarriedoutonthephotoelectricscanningprinciple.Thereadingsystemisbasedontherotationofaradialgraduateddiscformedbyopaquewindowsalternatedwithtransparentones.Thissystemisallilluminatedinperpendicularwaybyaninfraredlightsource,sothelightprojectsthediskimageonthereceiverssurface,whicharecoveredbyagratingcalledcollimator,havingthesamestepasthedisk.Thereceiversworktrasducingthelightvariationsoccuringwiththediskshifting,convertingthemintotheircorrespondigelectricalvariations.FunctioningPrincipleElectricalsignalraisedtogeneratethesquaredimpulseswithoutanydisturbancesmustbeelectronicallyprocessed.Thereadingsystemisalwayscarriedoutindifferentialmodecomparingtwodifferentsignalsnearlyidentical,butoutofphasefor180electricaldegreestoincreasethequalityandthestabilityoftheoutputsignals.Thereadingismadeonthetwosignalsdifference,eliminatingthedisturbancesdefinedshiftedcommonwaybecausetheyareoverlappedinanequalwayoneverytypeofwave.Theincrementalencodergivesusuallytwotypesofsquaredwavesthatareoutofphasefor90electricaldegrees,whichareusuallycalledchannelAandchannelB.Thereadingofonlyachannelgivestheinformationinrelationtothespeedrotation,whilethroughtheacquisitionofsecondchannelthesenseoftherotationisgivenonthebasisofthestatessequenceproducedbythetwosignals.AfurthersignalcalledZorzerochannelisalsoavailable,whichgivesthepositionofabsolutezeroontheencodershaft.ThissignalisasquaredimpulsewiththephaseandthewidthcenteredonAchannel.ofIncrementalencodersINCREMENTALENCODERGENERALDESCRIPTION2OpticaldiscPhotoemitterPhotoreceiversTheencoderisarotationaltransducertoconvertanangularmovementintoaseriesofelectricaldigitalimpulses.Thesegeneratedimpulsescanbeusedtocontrolangularorlinearmovements,iftheyareassociatedwitharackorendlessscrews.Theelectricalsignalsduringrotationcanbeelaboratedbynumericalcontrols(CNC),programmablelogiccontrols(PLC),controlsystems,etc.Themainapplicationsofthesetransducersareasfollows:machinetools,workingofthematerial,robots,retroactionsystemsonmotors,measuramentandcontrolapparatus.InELTRA’sencoderstheangularmovementtrasductioniscarriedoutonthephotoelectricscanningprinciple.Thereadingsystemisbasedontherotationofaradialgraduateddiscformedbyopaquewindowsalternatedwithtransparentones.Thissystemisallilluminatedinperpendicularwaybyaninfraredlightsource,sothelightprojectsthediskimageonthereceiverssurface,whicharecoveredbyagratingcalledcollimator,havingthesamestepasthedisk.Thereceiversworktrasducingthelightvariationsoccuringwiththediskshifting,convertingthemintotheircorrespondigelectricalvariations.FunctioningPrincipleElectricalsignalraisedtogeneratethesquaredimpulseswithoutanydisturbancesmustbeelectronicallyprocessed.Thereadingsystemisalwayscarriedoutindifferentialmodecomparingtwodifferentsignalsnearlyidentical,butoutofphasefor180electricaldegreestoincreasethequalityandthestabilityoftheoutputsignals.Thereadingismadeonthetwosignalsdifference,eliminatingthedisturbancesdefinedshiftedcommonwaybecausetheyareoverlappedinanequalwayoneverytypeofwave.Theincrementalencodergivesusuallytwotypesofsquaredwavesthatareoutofphasefor90electricaldegrees,whichareusuallycalledchannelAandchannelB.Thereadingofonlyachannelgivestheinformationinrelationtothespeedrotation,whilethroughtheacquisitionofsecondchannelthesenseoftherotationisgivenonthebasisofthestatessequenceproducedbythetwosignals.AfurthersignalcalledZorzerochannelisalsoavailable,whichgivesthepositionofabsolutezeroontheencodershaft.ThissignalisasquaredimpulsewiththephaseandthewidthcenteredonAchannel.ofIncrementalencodersINCREMENTALENCODERGENERALDESCRIPTION2OpticaldiscPhotoemitterPhotoreceiversExampleofincrementalwindowsA,BandZontheopticaldiscABZUNIENISO9