XITRON XT2640 - Mechanical Speed and Direction Inputs; Mechanical Torque Inputs

XT2640OperatingManual 13July2016 Page27of187
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Recommendation:
Inmostcasesbothspeedandtorquewillbemeasured,allowinganaccuratecomputationofmechanicalpowertobemade
availablebytheXT2640.
Thebestmethodfordeterminingspeed(anddirection)istouseashaftencoderwithquadraturedigitaloutputs.This
enablesspeedanddirectiontobeobtainedveryaccurately.Unlessthemotororgeneratorisknowntohavenomechanical
chatterwhenstoppedorrunningatlowrevolutionspeeds,thentheuseofboththedigitalSPDandDIRinputsis
recommendedasthiswillautomaticallycorrectlymeasurethemechanicalspeedwhensuchchatterispresent,otherwise
theindicatedspeedmaybeseriouslyaffectedbychatterifonlyasingledigitalsignalforspeedisused.
9.8.1 MECHANICALSPEEDANDDIRECTIONINPUTS
Ifrequired,mechanicalspeedanddirectioncanbeinputtotheXT2640usingaDCanalogvoltage,orbyusingone(speedonly)or
two(speedanddirection)digitalinputs.
9.8.1.1 DCANAL OGVOLTAGESPEED
IfusingaspeedtransducerwithaDCvoltageoutputthenthisoutputisconnectedtotheSPDinputBNCconnectoroftheXT2640MT
channel.Thepolarityofthissignalimpliesthedirectionofrotationofthemotororgenerator.YouwillneedtoconfiguretheSPD
inputasANALOGandsetthescalingandoffsetsettingsaccordinglyforthespecifictransducerbeingused.Thesignalrangeis+/‐
12Vpk.
9.8.1.2 DIGITALSPEEDAND(OPTIONALLY)DIRECTION
Ifusingadigitalspeed(optionallywithdirection)transducersuchasashaftencoderthenthedigitalsignalsshouldbeconnectedto
theSPDBNCconnectorandtheDIRBNCconnectorasapplicable.YouwillneedtoconfigurethenumberofpulsesoftheSPDsignal
perrevolutionofthemotororgenerator,andthedigitalpolarityoftheDIRsignal.ThedigitalsignalsareCMOS/TTLcompatibleand
eitherrisingorfallingedgeoftheSPDsignalcanbeconfiguredtobeused.
9.8.2 MECHANICALTORQUE INPUTS
Ifrequired,mechanicaltorquecanbeinputtotheXT2640usingaDCanalogvoltage,orbyusingadigitalpulsefrequencyinput.
9.8.2.1 DCANAL OGVOLTAGETORQUE
IfusingatorquetransducerwithaDCvoltageoutputthenthisoutputisconnectedtotheTRQinputBNCconnectoroftheXT2640
MTchannel.YouwillneedtoconfiguretheTRQinputasANALOGandsetthescalingandoffsetsettingsaccordinglyforthespecific
transducerbeingused.Thesignalrangeis+/‐12Vpk.
9.8.2.2 DIGITALTOR QUE
IfusingadigitaltorquetransducerthenthedigitalsignalshouldbeconnectedtotheTRQBNCconnector.Youwillneedtoconfigure
theTRQinputasDIGITALandsetthescalingandoffsetsettingsaccordinglyforthespecifictransducerbeingused.Thedigitalsignal
isCMOS/TTLcompatible.
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