Mack V-MAC IV - Page 64

56V-MACCo-PilotOperator'sManual
MaximumEngineSpeedLimit
Thismodeallowsthemaximumenginespeed(RPM)tobelimited,basedon
preprogrammedspeeds,whenPTOorElectronicHandThrottle(EHT)controlsare
engaged.Theenginewillnotoperatebeyondthesespeedswhenthecontrol(PTO
orEHT)isengaged.Theoperatorhasnocontroloverthisoperation,andcannot
changeoroverridethesepresetlimits.
VehicleLimitingSpeed
Theseprogrammablemodesallowthemaximumvehiclespeedtoberestrictedtoa
preprogrammedspeedlimit.Thedriverhasnocontroloverthisoperation,andcannot
changeoroverridethesepresetlimits.Anotherfeatureofthevehiclelimitingspeed
functionis“LowerGearRoadSpeedLimitFeatureActivation.”Thisoption,when
selected,willlimitvehiclespeedingearsbelowtopgeartoavaluelessthanthetop
gearroadspeedlimit.Thepurposeofthisoptionistoencouragetheoperatorto
operatethevehicleintopgear,wheretheoptimumfueleconomycanbeachieved.
Therearetwoprogrammable“topgear”VehicleLimitingSpeeds—oneforcruise
andtheotherforusewiththeacceleratorpedal(AP).
VehicleLimitingSpeedcanalsobelimitedtoseparatevaluesforeachpowertakeoff
(PTO).
Note:Thevehiclelimitingspeedincruise
controlmodecanbelowerorequaltothe
vehiclelimitingspeedinacceleratorpedal
mode.
HighAccelerationControl
Underlightload,highvehicleaccelerationconditions,themaximumengine
accelerationmaybelimitedtopreventwheelslippage.Enginespeed(RPM)willbe
limitedtoavaluejustabovetheratedspeedoftheengine.
Thisconditionshouldnotpreventthedriverfromshiftingtothenextgear.Ifthe
engineislimited,itisanindicationthatwheelslippageconditionsmaybepresentand
thatthedrivershoulddrivelessaggressivelyundertheselightlyloadedconditions.
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