User manual ELECTRO-VOICE 911 DATASHEET

[. . . ] 5 1. 2 Enclosure Rigging Hardware Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 XLC Rigging and Flying Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2. 1 Array Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2. 2 Rigging an Array Using the XLC Front Dollies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] ON EACH ENCLOSURE, ALWAYS MAKE SURE THAT THE LEFT AND RIGHT SWING ARMS ON THAT ENCLOSURE ARE LOCKED INTO THE SAME HOLES FOR THE SAME VERTICAL SPLAY ANGLE. THE QUICK-RELEASE LOCKING PINS ARE TETHERED TO THE REAR RIGGING FRAME WITH A LANYARD. THE QUICK-RELEASE PINS MUST ONLY BE LOCKED IN THE REAR RIGGING HOLES ON THE FRAME TO WHICH IT IS TETHERED. NEVER USE THE PINS FROM ONE ENCLOSURE TO LOCK INTO ANOTHER ENCLOSURE. Remove the front dollies from the suspended enclosures. Grab the clips on the sides of the dollies and pull them away from the sides of the enclosures until they unlatch from the rigging frame. Continue lifting the array until additional enclosures are suspended. Then pause again and repeat the process as described above. Continue this procedure until all the loudspeakers are rigged at the back. 11 ELECTRO-VOICE® XLC TM Rigging Manual Initially, the rear rigging will be slack as the array is lifted. As more enclosures are suspended, the rear swing arms in the top enclosures will go into tension. If it is desired to lock the enclosures at their vertical splay angles when in compression as well as in tension, the lifting should be paused so that the second quick-release pin can be installed in the hole immediately at the end of the swing arm. In that circumstance, Electro-Voice insists that the user maintain the higher safety factor as required by the local regulations throughout the entire XLC installation. It is the responsibility of the user to make sure that any XLC installation meets any applicable local, state or federal safety regulations. 15 ELECTRO-VOICE® XLC TM Rigging Manual 3. 2 Structural Rating Overview There are two independent strength ratings that, together, give a complete description of the overall structural performance capabilities of any XLC loudspeaker system. The strength of each individual rigging point; which is the combined strength of the rigging frame, the rigging frame components (front button bars, rear swing arm, quick-release pins, etc. ) and the enclosure. The total strength of the overall enclosure; which is a function of the combined forces from all of the rigging points acting on the rigging frames and enclosure as a whole. The array designer must be aware of the working-load-limit ratings and the loads being applied to the individual rigging points and the overall enclosure. An XLC loudspeaker system is only as strong as its weakest link. It is usually the case that one of the working-load limits will be approached sooner that the other. WHEN SUSPENDING ANY XLC LOUDSPEAKER SYSTEM OVERHEAD, THE WORKING-LOAD LIMITS MUST NEVER BE EXCEEDED FOR EACH INDIVIDUAL RIGGING POINT, OR THE OVERALL ENCLOSURE. The forces acting on each individual rigging point and on the overall enclosures in an XLC flying system will vary with each array configuration. Determining the forces throughout an array requires complex mathematical calculations. Electro-Voice engineers have, however, defined a set of simplified structural-rating guidelines that eliminate the need for the complex calculations for most array configurations. [. . . ] Never exceed the limitations or maximum recommended load specified by the hoist manufacturer. Always follow manufacturers recommendations for operation, inspection, and certification. Always raise and lower the load slowly and evenly, avoiding any rapid changes in speed or shifting loads that could result in a sudden jolt to the suspended system. Building, Tower or Scaffold Supports: Prior to each use, the strength and load-bearing capabilities of the building, tower or scaffold structural supports should be evaluated and certified by a professional engineer as being adequate for supporting the intended rigging system (including the loudspeakers, grids, chain hoists and all associated hardware). [. . . ]