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14 6 Setting up the Sensors for Screed Width 7 Calibrating Screed Width Control Extend the screed to the desired pave width of 5.8m. Then slide the sensors for screed width, guided by the clamps, into place. The sensors should be positioned in such a way that their measuring range is not left when moving the screed’s extending units in or out. The measuring range is indicated by two marks on the sensor. The sensors must not touch each other when retracting the screed. Then tighten the screws to firmly attach the sensors to the screed. Now fit the magnetic holders right above the sensors. The clearance between the magnet and the sensor should be 2mm and not exceed a maximum of 4mm. After installation of the sensors is completed and all cables are connected, the screed needs calibrating. Calibration is necessary every time the screed configuration or sensor position has been changed. To perform the calibration, just go to the screed operator’s ErgoPlus ® console and access the NAVITRONIC Plus ® calibration menue. Define the working range, which is your desired pave width +/-40cm (+/-20cm per side). In our example, the range extends from “MIN 5.4m” to “MAX 6.2m”. The working range sets the limits for screed width control.
8 Moving the Paver to the Starting Line 9 Setting up the Screed’s Elevation and Width Before moving the paver to the starting line, the external 3D system must have been installed and connected to NAVITRONIC Plus ® . Only then is it possible to pick up the paver’s actual position and to calculate the specified position. The next step is to select, on the display of the paver operator’s ErgoPlus ® console, the 3D sensor for automatic steering. Now the machine’s actual position is displayed on the paver operator’s ErgoPlus ® console. He can manoeuvre his machine to the starting line. The paver should be positioned on the steering line as accurately as possible (±5 to 10cm). In our example, the paver is positioned 10cm to the right of the steering line. Display of a positive value means, the paver’s position is to the right of the line. A negative value indicates a paver position to the left of the line. Now lower down the screed and roughly set the screed’s tow points to the desired height. From this setting, a screed planing angle results. For being able to work with digital data, select “3D” as a grade sensor (use F2 and F4 keys on the screed operators ErgoPlus ® console). The external positioning system picks up a difference in height and transmits this information to NIVELTRONIC Plus ® . The deviation is displayed by the system. It may be necessary to place timber under the screed for height correction until the deviation lies within the range of just millimetres. 10 That’s it ! Mix, please ! When all axes – X, Y and Z – are set up, you can commence paving. 15
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