These chassis solenoids are used to control air flow to several out of cab functions, such as PTO operation, fifth wheel slide, interwheel and interaxle power divider operation, and others. Since they are wired into the cab electrical system, it is possible to program VMAC IV to allow operation only when certain conditions are met. For instance, if PTO engagement is required to occur only when vehicle speed is 0 mph, park brake is engaged, and engine speed is at 1000 rpm, VMAC IV can be programmed to allow PTO engagement only if those conditions are met. It can also ramp up engine rpm to the desired rpm once it sees that the PTO has been engaged
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These chassis solenoids are used to control air flow to several out of cab functions, such as PTO operation, fifth wheel slide, interwheel and interaxle power divider operation, and others. Since they are wired into the cab electrical system, it is possible to program VMAC IV to allow operation only when certain conditions are met. For instance, if PTO engagement is required to occur only when vehicle speed is 0 mph, park brake is engaged, and engine speed is at 1000 rpm, VMAC IV can be programmed to allow PTO engagement only if those conditions are met. It can also ramp up engine rpm to the desired rpm once it sees that the PTO has been engaged