Mack V-MAC IV - Page 63

V-MACCo-PilotOperator'sManual55
VariableSpeedControl(VSC)
Tousethevariablespeedcontrolfunctions,thefollowingconditionsmustbemet:
1Theclutchmustbeengaged.
2Theparkbrakemustbeset.
ToactivateVSC,movetheSpeedControlswitchtotheONposition.Increaseengine
RPMusingtheacceleratorpedal(AP).Atthedesiredenginespeed(RPM),pressand
releasetheSETswitch.Thisspeedsettingwillbemaintained.
ToincreasetheRPM,pressandholdtheACCELswitchuntilthedesiredspeedis
attained.Or,presstheacceleratorpedaluntilthedesiredspeedisattainedandthen
pressandreleasetheSETswitch.
TodecreaseengineRPM,pressandholdtheDECELswitchuntilthedesiredspeed
isreachedandthenreleasetheswitch.
RPMcanalsobe“bumped”upordown.TaptheACCELsidetoincreaseRPM,or
theDECELsidetodecreaseRPMbythecustomer-programmedamount(default
settingis50RPM).
VSCcanalsobeprogrammedforAutoSetmode.Whenenabled,simplymovethe
SpeedControlswitchtotheONpositionandactivateacustomer-denedswitch
(usuallysettingtheparkingbrake).TheRPMwillgotothepreprogrammedminimum
speed.
The“ramprate”forEHT,andforeachPTOinPTOcontrol,canbeprogrammed
toincreaseanddecreaseinspeedtoacustomer-speciedspeedbyusingthe
ACCEL/DECELswitch.
DisengagingSSCorVSCFunctions
Todisengagethespeedcontrolsettings,useanyoneofthefollowingmethods:
•MovetheSpeedControlswitchtotheOFFposition.
•Disengagetheclutch.
•Applytheservicebrakes.
•Releasetheparkingbrake.
Note:WhenthePTOisengagedonvehiclesequippedwithSSC,theSSCwilltake
precedenceovertheVSC.
Note:ToreactivatetheVSCtothepreviouslysetspeed,pressandreleasethe
RESUMEswitch.IftheSpeedControlON/OFFswitchisusedtodisengagethe
VSC,anewspeedmustbeset.TheRESUMEswitchwillworkonlyiftheVSCwas
disengagedbyusingtheclutchorservicebrake.
https://truckmanualshub.com/