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P a g e
Control system
The spray paver’s control system operates pump functions and maintains
the emulsion application rate as set by the operator. The control system
is powered by the paver’s 24 VDC electrical circuit.
Emulsion flow rate determination
The control system sets the emulsion flow rate by regulating the speed of
the emulsion pumps. It does this by regulating the hydraulic flow rate
delivered to the pump hydraulic drive motors.
The following inputs are used by the control system to set emulsion flow
rate:
Application rate (in gal/yd
2
or L/m
2
) – Set by the operator
Spray bar width – Calculated from operator’s spray nozzle
selection
Vehicle speed – Determined by input from the paver
Emulsion pump speed – Measured by the speed sensor in the
hydraulic motors that drive the small and large emulsion pumps
If vehicle speed is increased or decreased, pump speed will increase or
decrease to maintain the desired application rate.
Components
The control system consists of these major components:
Display screen unit
Pendant control
Control unit
Fuse panel
Signal splitter
Emulsion pump speed pickups
Tank selector switch
