Rigging manual LR24 Rev. 1.21
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5. Array configurations ___________________________________________
Ground stacking PRRG
This description features a 4 piece ground stacked array on a PRRGL24. This is the preferred way of stacking which requires no manual lifting.
Make sure that the array is assembled on a flat and stable surface
Begin by positioning PRRGL24 to the desired location. Ensure that the centre of gravity will be well
within the mounting base. This can be determined by the Alcons Ribbon Calculator™ simulation
program.
In most cases a pack of LR24’s is sufficient. In this case the system will be in compression mode,
with the red pins on the angle frame. Set all angles to the desired setting.
Mount the stack feet to each corner of the PRRGL24. The slide tube can be inserted in both ends of
the stack foot base bracket and is then locked with a pin at the desired length position. In this way a
left or right assembly can be made.
Turn the levelling foot down to the ground plane.
Hold or push the LR24 cabinets in their vertical position and pull out the red pin on the bottom
cabinet. This is a two man job.
Let the cabinets compress again until the angle is reached. Work your way up.
If the stacked pre-rig needs to be level, turn the levelling feet down to where there is no more slack in
the assembly. It is not necessary to lift the entire PRRGL24 off the ground
When the complete angled array needs to be tilted, adjust the levelling feet accordingly and use the
front or back castor wheels as pivoting point so they will take much of the weight.
