L-Acoustics ARCS Operator's Manual

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L-Acoustics ARCS Operator's Manual Manual pdf 38 page image

L-ACOUSTICS ARCS Manual V2.0 2/13/2003 375. INSTALLATION PROCEDURESWARNING: NOT FOLLOWING THE RIGGING PROCEDURES OUTLINED BELOW MAY RESULTIN A SERIOUS SAFETY HAZARD.5.1 INSTALLATION OF A SINGLE ROW FLOWN SYSTEMLocate all ARCS enclosures, side-by-side, at the location where they are to be rigged. For most flownapplications, the 40 degree vertical coverage angle will be directed downwards. This means that whenflown, the rear connector jack plates will be oriented downwards and the front L-ACOUSTICS logoswill be up. Check that all ARCS enclosures are physically oriented in the desired manner.Lift the enclosures to a vertical (standing) position by using the handles located on the top (or bottom)of each ARCS enclosure. Array the enclosures in a tightly-wrapped configuration (i.e., wall-to-wall)and remove the front dollies. When removing the O-ring spring pins from the positioning studs, watchyour fingers! The feeling is similar to a mouse trap...Position the ARCS enclosures side-by-side so that the integral flying rails are aligned (this is easier ifyou are on a flat surface). Use two coupling bars (ARCOUPL) per two cabinets (top and bottom) tomechanically join adjacent ARCS enclosures. Unlock and remove one shackle to free one end of eachcoupling bar (typically the front shackle). Slide two ARCOUPL bars into the corresponding rails,between each pair of adjacent enclosures - one top, one bottom. Carefully place, lock and tighten theend shackles to secure the coupling bars. Once all ARCS enclosures of the array have beenmechanically coupled together, top and bottom, the array is built.Always install two ARCOUPL coupling bars between adjacent enclosures (top and bottom)To fly an array of 2 or 4 ARCS enclosures, one BUMP3 is required. To fly an array of 1, 3, 5,6, 7 or 8 ARCS enclosures, two BUMP3 and one LIFTBAR are required.Each BUMP3 is designed to work as an assembly with one ARCOUPL. To construct a BUMP3assembly, remove the two end shackles from an ARCOUPL and align the ARCOUPL and BUMP3 sothat their end holes are aligned. Secure the ARCOUPL (rear end only) with the locking nut and boltassembly, ensuring that the cotter pin safety is installed.Note: With reference to the ARCS rigging reference chart, the serial number plate acts as a reference forinstalling BUMP3, i.e. the serial number plate should be oriented towards the front of the array.Once the rear connection between the BUMP3 and ARCOUPL is assembled, slide the ARCOUPL intothe corresponding upper rails of the ARCS enclosures from the rear. Lower the BUMP3 and align itsfront hole with the front hole of the ARCOUPL. Align the front holes on ARCOUPL and BUMP3 andplace the pierced bolt into position to join the two assemblies. Install then tighten the nut until thesecurity hole in the bolt is accessible. Lock the nut into position by sliding the spring pin (cotter pin)into the security hole.With reference to the ARCS Rigging Reference Chart, place the main BUMP3 shackle(s) in the desiredhole of the BUMP3 and tighten securely.For 2 or 4 element ARCS arrays, at this point, the array is ready to be flown.For larger arrays, 2 or more BUMP3 are required and should be placed in such a way as to provideequal load distribution. For example, for a single row 6 element ARCS array, two BUMP3 will beplaced between enclosures 2 & 3 and 4 & 5 and a LIFTBAR used between the two BUMP3. For adouble row 8 element ARCS array, BUMP3 will be placed between enclosures 1 & 2 and 3 & 4 on thetop row and a LIFTBAR used between the two BUMP3. When more than 8 ARCS enclosures are tobe flown, it is advisable to use one BUMP3 per four ARCS enclosures (vertical or horizontal) as aguideline.Always consult a certified rigger if you have any questions regarding safe rigging practice.