3D Paving Training AutoAdjust March 2010 by Phil Jackson

What is AutoAdjust? AutoAdjust automates the previous manual nudging of the screed PCS900 v1.10 monitors the height of the trailing edge of the screed and automatically adjusts the system to keep this point on grade Manual nudging via the underlying 2D control system (PCS400, AccuGrade, Cat Grade & Slope or MOBA) is still supported

PCS900 v1.00 PCS900 v1.00 emulates a 2D grade sensor Think of the MT900 as a sonic tracer Control point is below the mast Move the target forward for smoother response Move the target backward for a more accurate response Screed trailing edge is not automatically controlled in v1.00 Manual adjustments were required

Why we needed to ‘nudge’ Other factors control the screed height too Angle of attack Material head Mixture Speed Temperature Etc. Differences between static measure-up and screed floating

No different to 2D system 2D systems test depth to check mat thickness Then adjust the operation to correct depth Assuming all other factors are OK then by incrementing or decrementing the 2D offset On US Screeds can also turn the crank handle After paving some distance Depth Checker confirms the correction

No different to 2D system V1.00 3D system uses a Grade Checker to check mat surface height Then you adjust the operation to the correct height Assuming all other factors are OK then by incrementing or decrementing the 2D offset On US Screeds can also turn the crank handle After paving some distance Grade Checker confirms the correction

AutoAdjust V1.00 3D system requires you to inc/dec the 2D system to correct height because we only control under the target V1.10 3D system automates this

V1.10 3D system AutoAdjust By monitoring the height of the trailing edge of the screed Like having a permanent Grade checker riding on the back Then adding or subtracting an adjustment Just like a manual inc/dec in v1.00

How AutoAdjust works AS450 Very slow with very small steps

How Not to Break AutoAdjust Use a Non-US Screed With No Crank Handle Mount the 3D Target on the screed Not the tow arm Do NOT wind the Crank handle on US screeds If you target is mounted on the tow arm

Tow Arm mounted Target on US Screeds Winding the Crank Handle alters the position of the back of the screed relative to the target Invalidates the measure-up IF you Wind the Crank Handle you MUST Re-Bench Step 14 of the Quick Start Guide

Details Always on by default Text item reports amount of Automatic Adjustment applied Support person can turn this off But why would you? AutoAdjust learns Will start blank and learn in first 30 feet Remembers and updates constantly

Graphical Explanation The next slides step through time and explain each stage of AutoAdjust Time is given as T0, T1, T2, etc. The sample values are larger than you will see on a real job

AutoAdjust – Definitions 2D is height from Target to Design 3D is height from Screed to Design AutoAdjust is correction value Design

AutoAdjust – Steady State Everything is correct 2D = 0.000 3D = 0.000 AutoAdjust = 0.000 Target Value = 3.000 Measured Value 2D = 0.000 Design

AutoAdjust – Paving Change Screed lowers 2D = -0.020 3D = -0.030 AutoAdjust = 0.000 Target Value = 3.000 Measured Value = 2.980 2D = -0.020 Design

AutoAdjust – 2D Response 2D Drives tow point to correct Target Height 2D = 0.000 3D = -0.010 AutoAdjust = 0.000 Target Value = 3.000 Measured Value 2D = 0.000 Design

AutoAdjust – 2D Steady T3 2D on Zero for a period, 3D low 2D = 0.000 Target Value = 3.000 Measured Value 2D = 0.000 Design

AutoAdjust – AutoAdjust Starts AutoAdjust adds difference to Set Height 2D = -0.010 3D = -0.010 AutoAdjust = 0.010 Target Value = 3.010 Measured Value = 3.000 2D = -0.010 Design

AutoAdjust – 2D Corrects 2D on Zero for set period 2D = 0.000 3D = 0.000 AutoAdjust = 0.010 Target Value = 3.010 Measured Value 2D = 0.000 Design

AutoAdjust – Steady State Screed steady in new position, 3D correct 2D = 0.000 3D = 0.000 AutoAdjust = 0.010 Target Value = 3.010 Measured Value 2D = 0.000 Design

Questions ?