Trimble PCS400 Paving Control System uses a 2D reference to pave with a fixed thickness. This makes the PCS400 an excellent, lower cost option for roads that have been graded or milled using 3D machine control.
Each side of the paver is typically equipped with one sonic tracer or with three sonic tracers mounted on an averaging beam. These sonic tracers send multiple sonic signals to reference off the existing surface and calculate an average elevation for paving a smooth surface.
The ST200 sonic tracer can be configured to use stringline as a reference line to control the paver. In this mode the sonic tracer will measure any lateral movement of the machine relative to the stringline. When the sonic tracer’s center is moving away from the stringline, the control box warns you and provides correction guidance.
Slope Sensor Reference
The PCS400 system can also use the Trimble AS200 Angle Sensor to reference the desired cross-slope of the road. Designed specifically for asphalt pavers, the sensor rarely needs recalibration and paves cross slopes of up to 0.5% accurately and consistently.