Mack V-MAC IV - Engine Speed Control

54V-MACCo-PilotOperator'sManual
EngineSpeedControl
EngineSpeedControlOperation
Thevehiclemanagementandcontrol(V-MAC)IVsystemalsoallowstheoperatorto
setandmaintainincreasedenginespeeds.Thesystemprovidestwodifferentspeed
controlfunctions:ElectronicHandThrottlecontrolandPTOcontrol.electronichand
throttle(EHT)controlsenginespeedwhenPTOisnotengaged.
Bothsystemsallowtwomodesofcontrol:
1SingleSpeedControl(SSC)increasestheengineRPMtoaspeedpreprogrammed
intothesystemmemory.ThismodeisintendedforoperationofthePTOat
maximumefciency.
2VariableSpeedControl(VSC)allowsthedrivertosetanyengineRPMwithin
thepreprogrammedlowandhighlimitssetinthesystemmemory.Thismodeis
primarilyintendedforgeneralPTOapplicationsandenginewarm-up.
Note:Brakeconditionsarecongurable,
butthestandardsettingisparkbrakeon
andservicebrakeofftoengage.
SingleSpeedControl(SSC)
Tousesinglespeedcontrolfunctions,thefollowingconditionsmustbemet:
1Forpowertakeoff(PTO)operation,thePTOmustbeengaged.Forelectronichand
throttle(EHT)operation,theservicebrakemustbeOFF.
2Theclutchmustbeengaged(notpressed).
ToactivateSSC,movetheSpeedControlswitchtotheONposition,thenpressand
releasetheSETswitch.Theenginespeed(RPM)willjumptothepreprogrammed
speed.SSCcanalsobeprogrammedforAutoSetmode.Whenenabled,simply
movetheSpeedControlswitchtotheONpositionandengagethePTOoractivate
acustomer-denedswitch(usuallysettingtheparkbrake).Enginespeedwillgo
tothepre-programmedspeed.
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