4 Using 2D Guidance in theField
The system provides two methods for establishing an elevation reference:
l By benching using the elevation of the bucket focus as the reference.
l By using the elevation of a laser plane as the reference.
If using a cab rotation sensor, you must bench the rotation before you bench the
elevation. To bench the cab rotation sensor, see Bench rotation, page 86.
Note – The availability of a particular elevation reference will depend on the site
infrastructure and the vertical guidance method chosen.
4.6.1 Using the bucket focus as the reference elevation
To bench the system using the elevation of the bucket focus as the reference
elevation:
1. Place the machine in a convenient location to work the surface. If using a
profile or a slope, orient the machine with the arm parallel to the long section
of the profile, or parallel to the mainfall of the slope.
ATTENTION — Benching with the tilt bucket warning indicator displayed may give
poor results.
2. If using a profile, check the orientation and origin of the profile:
Press Profile to open the Select Profile dialog.
Press Flip Profile to reflect the profile about its vertical axis.
Press Origin:Point <value> as often as required to select a different point
on the profile as the origin. This point will be at the bucket tip after
benching.
These tools are useful if, for example, you want to work the surface from
the opposite side.
3. Place the bucket focus on the benchmark, or at the location you want to make
the origin of the profile, and press Bench Elevation. The bench elevation is
accepted as the reference elevation, and all depths will be relative to the bench
point.
4. If you have previously benched the system, press and hold Bench Elevation to
open the Bench Elevation dialog.
100 GCS900 GradeControl System for Excavators Operator's Manual
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