Mack CSM 2010 - Page 123

OPERATION115
VariableSpeedControl(VSC)
Tousethevariablespeedcontrolfunctions,thefollowingconditionsmustbemet:
1Theclutchmustbeengaged.
2Theparkbrakemustbeset.
ToactivateVSC,movetheSpeedControlswitchtotheONposition.IncreaseengineRPM
usingtheacceleratorpedal(AP).Atthedesiredenginespeed(RPM),pressandreleasethe
SETswitch.Thisspeedsettingwillbemaintained.
ToincreasetheRPM,pressandholdtheACCELswitchuntilthedesiredspeedisattained.
Or,presstheacceleratorpedaluntilthedesiredspeedisattainedandthenpressandrelease
theSETswitch.
TodecreaseengineRPM,pressandholdtheDECELswitchuntilthedesiredspeedis
reachedandthenreleasetheswitch.
RPMcanalsobe“bumped”upordown.TaptheACCELsidetoincreaseRPM,orthe
DECELsidetodecreaseRPMbythecustomer-programmedamount(defaultsettingis
50RPM).
VSCcanalsobeprogrammedforAutoSetmode.Whenenabled,simplymovetheSpeed
ControlswitchtotheONpositionandactivateacustomer-denedswitch(usuallysetting
theparkingbrake).TheRPMwillgotothepreprogrammedminimumspeed.
The“ramprate”forEHT,andforeachPTOinPTOcontrol,canbeprogrammedtoincrease
anddecreaseinspeedtoacustomer-speciedspeedbyusingtheACCEL/DECELswitch.
DisengagingSSCorVSCFunctions
Todisengagethespeedcontrolsettings,useanyoneofthefollowingmethods:
•MovetheSpeedControlswitchtotheOFFposition.
•Disengagetheclutch.
•Applytheservicebrakes.
•Releasetheparkingbrake.
Note:WhenthePTOisengagedonvehiclesequippedwithSSC,theSSCwilltake
precedenceovertheVSC.
Note:ToreactivatetheVSCtothepreviouslysetspeed,pressandreleasetheRESUME
switch.IftheSpeedControlON/OFFswitchisusedtodisengagetheVSC,anewspeed
mustbeset.TheRESUMEswitchwillworkonlyiftheVSCwasdisengagedbyusing
theclutchorservicebrake.