Curtis Instruments 1238 User Manual

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#URTIS-ANUAL/3 
7HENAWIREPOTENTIOMETERISUSEDTHECONTROLLERPROVIDESFULLFAULT
PROTECTIONINACCORDANCEWITH%%#REQUIREMENTS4HEPOTISUSEDINITSVOLTAGE
DIVIDERMODEWITHTHECONTROLLERPROVIDINGTHEVOLTAGESOURCEANDRETURN0OT
(IGHPROVIDESACURRENTLIMITED6SOURCETOTHEPOTAND0OT,OWPROVIDES
THERETURNPATH4HISISTHETHROTTLESHOWNINTHEBASICWIRINGDIAGRAM&IGURE
FORTHEDRIVETHROTTLEANDFORTHEBRAKETHROTTLE
4HE%4
888ELECTRONICTHROTTLEISTYPICALLYUSEDONLYASADRIVETHROTTLE
4HE%4888CONTAINSNOBUILTINFAULTDETECTIONANDTHECONTROLLERWILLDETECT
ONLYOPENWIPERFAULTS)TISTHERESPONSIBILITYOFTHE/%-TOPROVIDEANYAD
DITIONAL
THROTTLE
FAULTDETECTIONNECESSARY
4HROTTLE4YPE
&ORTHESEWIRERESISTIVEPOTENTIOMETERSSHOWNIN&IGUREFULLTHROTTLEREQUEST
CORRESPONDSTOKΩ
MEASUREDBETWEENTHEPOTWIPERPINANDTHE0OT,OWPIN
).34!,,!4)/.7)2).' 4HROTTLE7IRING
"ROKENWIREPROTECTIONISPROVIDEDBYTHECONTROLLERSENSINGTHECURRENTmOW
FROMTHEWIPERINPUTPINORTHROUGHTHEPOTENTIOMETERANDINTO0OT
,OWPIN)FTHE0OT,OWINPUTCURRENTFALLSBELOWM!ATHROTTLE
FAULTISGENERATEDANDTHETHROTTLEREQUESTISZEROED.OTE0OT,OWPIN
MUSTNOTBETIEDTOGROUND"
4HROTTLE4YPE
4YPETHROTTLESOPERATEINWIGWAGSTYLE.OSIGNALSTOTHECONTROLLERSFORWARD
ANDREVERSEINPUTSAREREQUIREDTHEDIRECTIONISDETERMINEDBYTHEWIPERINPUT
VALUE/NLYn6VOLTAGESOURCESANDWIREPOTENTIOMETERSCANBEUSEDAS
4YPETHROTTLES4HECONTROLLERINTERFACEFOR4YPETHROTTLESISTHESAMEASFOR
4YPETHROTTLESSEE&IGURE4HENEUTRALPOINTWILLBEWITHTHEWIPERAT
6MEASUREDBETWEENPOTWIPERINPUTPINAND)/GROUNDRETURNPIN
4HECONTROLLERWILLPROVIDEINCREASINGFORWARDSPEEDASTHEWIPERINPUTVALUEIS
INCREASEDANDINCREASINGREVERSESPEEDASTHEWIPERINPUTVALUEISDECREASED
7HENAWIREPOTISUSEDTHECONTROLLERPROVIDESFULLFAULTPROTECTION
7HENAVOLTAGETHROTTLEISUSEDTHECONTROLLERWILLDETECTOPENBREAKSINTHE
WIPERINPUTBUTCANNOTPROVIDEFULLTHROTTLEFAULTPROTECTION

&IG 7IRINGFOR4YPE
THROTTLES

Curtis Instruments 1238 Specifications

General

Brand	Curtis Instruments
Model	1238
Category	Controller
Language	English