d&b Vi - Manual (Page 33)

5.1. Hoisting the array
WARNING!
Potential risk of personal injury and/or
damage to material!
Always ensure that each of the hoists is able to carry the total
weight of the array.
When hoisting the array, unpredictable dynamic forces as well as
swinging of the array must be taken into account. This may lead to
personal injury and/or damage to the rigging components and
loudspeaker cabinets.
Ensure that there is nobody directly underneath or in the vicinity of
the load who is not involved in the setup.
When all the mechanical adjustments, system checks and safety
checks have been made, the array can be hoisted up to its
operating position and firmly attached to the onsite roof
construction.
The chain hoist motors must raise the system slowly and evenly so
that it does not swing or move from side to side during hoisting.
5.2. Modifying the vertical aiming of the array
The Z5387.001 Vi Mounting frame bottom is used if the
application requires the array to have an overall vertical angle that
is not covered by ArrayCalc or cannot be obtained by the
intended suspension.
The bottom frame allows the attachment of additional steel wire
ropes or hoists.
WARNING!
Potential risk of personal injury and material
damage!
Using additional wires or hoists changes the load conditions within
the array and its rigging components. The load calculated using
ArrayCalc no longer applies. For this reason, increasing the
vertical angle of an array requires individual considerations and
calculations based on the relevant onsite conditions.
Always pull the additional wires or hoists to the back and upwards,
as shown in the graphic opposite.
Fig. 20: Z5387.001 Vi Mounting frame bottom serving to increase
the overall vertical angle of the array
5. Hoisting and aiming the array
d&b Vi Rigging manual (1.2 EN) 33