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NOTE: When using chains or making custom
bridle lengths to achieve vertical tilt, be sure
the center of gravity of the nal hung array is
within the allowable limits of the MTG-3D Top
Grid. (See “M3D Placement Calculator.”).
TIP: Some venues, such as theaters, have
only side-to-side motor points available
through the ceiling plaster. In this case, you
can rig two front/rear motors through the
same ceiling hole, but attach them separately
to the venue’s structural steel beams,
provided that the single point is sufciently
rated for the entire weight of the array. The
two steel cable sets must be held together
with a loose shackle slightly below the plaster
ceiling to prevent damage to the ceiling as
the chain or steel pulls sideways when the
array is raised to its desired position.
CHOOSING PICKUP POINTS
When choosing rigging points, refer to “Appendix A
— Congurations and Load Ratings,” for various hanging
congurations, maximum weights, bridle lengths, and
array limits for 5:1 and 7:1 safety factors. Use these values
as applicable rigging for the venue.
It is also important to keep in mind the following
considerations:
1. The most exible hanging conguration is one similar
to that shown in the section “Conguration F” in
Appendix A to hang the array directly from a venue’s
structural beam without using bridles. Fewer bridles
will improve the efciency of rigging, adjusting vertical
trim and adjusting horizontal orientation.
3. The array may develop as much as 3 feet of
downstage (front) curve (see Figure 8) while being
assembled. Often, the array will be assembled near
the downstage edge or a similar situation. Calculate
the depth of the system to ensure that the lower M3Ds
will be able to be attached to the bottom of the array
as it moves downstage during assembly.
Figure 8. M3D array 12-deep side view during assembly and
in own position
4. The array may develop as much as 7 feet of upstage
(rear) curve (see Figure 8) when own into position.
If there is a wall or upstage structure, calculate the
depth of the system to ensure that it can be own into
its intended position after assembly and vertical trim
is applied. The M3D Placement Calculator will provide
the total array depth.