User's Manual

GM550 v1043 FCC-IC.doc Revision 2 15
Crane Rigging – Capacity Chart Selection
The GS550 can be programmed to assist the operator by indicating the working load limit (WLL)
from the crane specific rated capacity charts according to the angle and radius information
received from the boom mounted sensors. Under no circumstances is the GS550 a substitute for
safe operating practices. The operator must fully understand the crane rigging and the crane rated
capacity chart to be able to correctly program the GS550 for rated capacity indication. The GS550
will not take into account critical variables such as weather, ground and crane conditions that will
reduce the safe working capacity of the crane.
In order to indicate WLL the GS550 must be programmed with a valid rated capacity chart specific
to the crane. The capacity chart programmed can be verified on the chart number page of the
Information menu: press Info → Next → Next (press Exit to return to the operation display). If the
chart number information screen says “Chart not loaded” the GS550 has not been programmed to
function as a rated capacity indicator. If rated capacity indication is required contact the person
responsible for the GS550 system installation and maintenance. If in doubt, contact LSI.
Rated capacity indication is based on interpretation of a selected capacity chart using boom angle
and load radius. This requires:
Installation: The GS550 must be programmed for a correctly installed boom angle sensor
and a radius sensor. Additionally a length sensor will be required for telescopic booms;
luffing jibs may require an angle sensor. Furthermore, the GS550 must be programmed with
accurate mounting point dimensions for the head sheaves, jibs, extensions and other
structures that will determine working load radius for each of the hoist lines used; reference
menu 4C) Radius Settings.
Operation: The chart must be selected by “rigging” the working sheave in the GS550; this is
done by following the chart wizard in menu 2) Crane Rigging.
The Chart Wizard
Important! It is possible to leave the chart wizard at any time by pressing Bypass; the
GS550 will display the message “Rigging ABORTED”. Current capacity chart selection
may have changed, possibly changing the rated capacity indicated by the GS550.
Always complete the chart wizard all the way to the “Rigging ok” message before
operating the crane.
Step 1. Press Menu → Next → Enter to start the chart wizard.
Step 2. The first page of the chart wizard is generally “select sheave”. Use Up and Down to
adjust the sheave number. If the there is only one load sensor in the system leave the
sheave value at one. With two or more load sensors in the system sheave one (the
main hoist) is associated with the first load sensor in the sensor list; sheave two (the
auxiliary) is associated with the second sensor in the sensor list etc.
Step 3. Press Next to advance to the next step of the chart wizard.
Step 4. The steps that follow will depend on the size and complexity of the rated capacity chart
itself. Typical steps include chart selection, outrigger / on rubber selection and boom
length selection (lattice cranes only). Use Up and Down to select from the list of
choices and then press Next to advance to the next step. For accurate rated capacity
indication the rigging configuration selected in the chart wizard must reflect the actual
rigging of the working sheave.