User's Manual

GM550 v1043 FCC-IC.doc Revision 2 43
Step 2) Determine the following measurements to within a tenth of a foot: slew offset, sheave head
length and sheave radius. These measurements are described in the subsections Radius
Parameters for a Lattice Crane and Radius Parameters for a Hydraulic Crane that follow. Verify
that the radius parameters have been set correctly; the values may be adjusted with the + and -
buttons. Press the Next button to proceed from one parameter
to the next.
Step 3) Test the radius indication. Compare the radius displayed
with the actual radius at different lengths of boom extension and different boom angles. If the
radius displayed by the GS550 corresponds to the actual radius in all cases, the radius function is
correctly calibrated. Be sure that all radius parameters have been carefully noted to facilitate re-
calibration in the event of component or system upgrade, change, or re-installation. If there is a
difference between displayed radius and actual radius that remains constant during changes in
boom length and angle the slew offset can be adjusted to compensate (see step 2 above). E.g. if
the radius displayed is always 2.3 feet longer than the actual radius subtract 2.3 from slew offset. If
the radius displayed is still different from the actual radius proceed to the subsection Radius
Display Troubleshooting that follows.
1 25400 A:20.0
L: 16.0 R: 7.5