Curtis Instruments 1238 - Page 39

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#REEP?4ORQUE?4RQ- n NOTHROTTLEINPUTTOEMULATETHEFEELOFANAUTOMATICTRANSMISSION
AUTOMOBILESEE&IGURE7!2.).'7HENINTERLOCKISENGAGED
CREEPTORQUEALLOWSVEHICLEPROPULSIONIFADIRECTIONISSELECTEDEVEN
THOUGHNOTHROTTLEISAPPLIED#ARESHOULDBETAKENWHENSETTINGUP
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PARAMETER
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PEDALBRAKINGISENABLEDSEEPAGECREEPTORQUEIS
PROGRESSIVELYDISABLEDASBRAKEISAPPLIEDSOASTOPREVENTTHEMOTOR
FROMDRIVINGINTOTHEBRAKESANDTHUSWASTINGENERGY
"RAKE&ULL#REEP#ANCEL n $ETERMINESTHEAMOUNTOFBRAKEPEDALINPUTTHATWILLFULLYCANCELTHE
"RAKE?&ULL?#REEP?#ANCEL?4RQ- n CREEPTORQUE!MOUNTOFCANCELLATIONISPROPORTIONALTOTHEBRAKEINPUT
#REEP"UILD2ATE nSEC $ETERMINESHOWFASTTHEPROGRAMMEDCREEPTORQUEBUILDSWHEN
#REEP?"UILD?2ATE?4RQ- n ADIRECTIONISSELECTED
#REEP2ELEASE2ATE nSEC $ETERMINESHOWFASTTHEPROGRAMMEDCREEPTORQUERELEASESWHENTHE
#REEP?2ELEASE?2ATE?4RQ- n BRAKEISCANCELLINGTHECREEPTORQUEORWHENTHEDIRECTIONSWITCHESARE
CLEAREDNEUTRAL
'EAR3OFTEN n !DJUSTSTHETHROTTLETAKEUPFROMLINEARSETTINGTOAN3CURVE
'EAR?3OFTEN?4RQ- n ,ARGERVALUESCREATESOFTERTHROTTLETAKEUPINFORWARDANDREVERSE
3OFTENINGISPROGRESSIVELYREDUCEDATHIGHERSPEEDSSEE&IGURE
"RAKE4APER3PEED nRPM $ETERMINESTHEMOTORSPEEDBELOWWHICHTHEMAXIMUMBRAKINGCURRENT
"RAKE?4APER?3PEED?4RQ- n ISLINEARLYREDUCEDFROMTOATZEROSPEEDSEE&IGURE
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SPEEDTOOLOWFORTHEBRAKINGCURRENTWILLCAUSE
OSCILLATIONSINTHE
MOTORASITATTEMPTSTOBRAKETHEVEHICLETOASTOP
ONVER
YSTEEPSLOPES
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SPEEDISAPPLICABLEONLYINRESPONSETOBRAKEPEDALINPUTIT
DOESNOTAFFECTDIRECTIONREVERSALBRAKINGORNEUTRALBRAKING
2EVERSAL3OFTEN n ,ARGERVALUESCREATEASOFTERREVERSALFROMREGENBRAKINGTODRIVE
2EVERSAL?3OFTEN n WHENNEARZEROSPEED4HISHELPSSOFTENTHETRANSITIONWHENTHEREGEN
ANDDRIVECURRENTLIMITSARESETTODIFFERENTVALUES
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-AX?3PEED?!CCEL?4RQ- n THROUGH6#,OROVERTHE#!.BUS4HE-AX3PEED!CCELPARAMETER
CONTROLSTHERATEATWHICHTHEMAXIMUMSPEEDSETPOINTISALLOWEDTO
CHANGEWHENTHEVALUEOF-AX3PEEDISLOWERED4HERATESETBYTHIS
PARAMETERISTHETIMETORAMPFROM4YPICAL-AX3PEEDRPMTORPM
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EXAMPLESUPPOSEYOUCHANGE-AX3PEEDFROMRPMTO
RPM)F4YPICAL-AX3PEEDISRPMANDTHERATEISSEC
ONDS
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WILLTAKEnSECONDSTORAMPFROM
RPMTORPM