User manual ELECTRO-VOICE 12TRXC DATASHEET

[. . . ] 5 1. 2 Enclosure Rigging Hardware Details. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 XLCi Rigging and Flying Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2. 1 Array Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2. 2 Rigging an XLCi Array . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Rigging-Strength Ratings, Safety Factors, and Special Safety Considerations 3. 1 Working-Load Limit and Safety Factor Definitions The structural ratings for all of the XLCi rigging components and complete loudspeaker systems are based on test results in which parts were stressed to failure. Manufacturers typically present the structural-strength ratings of mechanical components or systems as either the working-load limit (WLL) or the ultimate-break strength. Electro-Voice chooses to present the structural-load ratings of the XLCi loudspeaker systems as the working-load limit. The working-load-limit rating represents the maximum load that should ever be applied to a mechanical component or system. THE USER SHOULD NEVER APPLY A LOAD THAT EXCEEDS THE WORKINGLOAD LIMITS OF ANY OF THE RIGGING COMPONENTS OR COMPLETE LOUDSPEAKER SYSTEMS DESCRIBED IN THIS MANUAL. The working-load limits for the XLCi rigging components and complete loudspeaker systems described in this manual are based on an 7:1 safety factor. The safety factor is defined as the ratio of the ultimate-break strength divided by the working-load limit, where the ultimate-break strength represents the force at which a part will structurally fail. For example, if a part has working-load limit of 1, 000 lb (454 kg), it would not structurally fail until a force of at least 7, 000 lb (3, 629 kg) was applied, based on a 7:1 safety factor. However, the user should never apply a load to that part that exceeds 1, 000 lb (454 kg). The safety factor provides a margin of safety above the working-load limit to accommodate normal dynamic loading and normal wear. CAUTIONS for Working-Load Limits and Safety Factors The working-load limits defined by the manufacturer of any rigging component should never be exceeded. Electro-Voice bases the working-load limits of its XLCi products on an 7:1 safety factor. Other manufacturers of rigging components may base their working-load limits on safety factors other than 7:1. Angles of the force components on the rear connector arms and rigging plates relative to the enclosures. Figure 7: Simplified X i Rigging-Rating Guidelines LC ELECTRO-VOICE® XLCiTM Rigging Manual 16 Figure 7 includes a graph of the working-load weight-versus-angle limit rating for the XLCi enclosures. This working-load weight limit is applicable to every enclosure in an array, and includes the weight of that enclosure plus the total weight of all enclosures and rigging hardware suspended below it. The absolute enclosure angle is the vertical angle of that enclosure, where 0° represents an upright enclosure facing straight ahead (0° elevation angle). These working-Ioad-versus-angle limits take into account the complex forces generated in the front connector bars, the rear connector bars, the rigging plates, the enclosures and the (optional) pull-up line, as a result of the complex weight distribution throughout the array. Also included in the simplified structural-rating guidelines in Figure 7 are side-to-side and front-toback angle limits for the front connector bars and rear connector bars on the top enclosure. WHEN APPLYING THE SIMPLIFIED STRUCTURAL RATING GUIDELINES TO ANY XLCi LOUDSPEAKER SYSTEM SUSPENDED OVERHEAD, THE USER MUST OBEY THE FOLLOWING RULES: 1. Never exceed the working-Ioad-versus-angle limit for any enclosure in the array. Never exceed the side-to-side angle limits for the front connector bar assemblies on any enclosure. Never exceed the side-to-side angle limits for the rear connector bar assemblies on any enclosure. Always make sure that every front connector bar is securely bolted to the front rigging plate on every enclosure (and grid, when applicable) before lifting overhead. Always make sure that every rear connector bar is securely bolted to the rear rigging plate with the supplied hardware on every enclosure (and grid, when applicable) before lifting overhead. If a pull-up grid is used, never exceed the side-to-side angle limits for the pull-up grid. [. . . ] Always double check that each pull-up grid is securely bolted to the front connector bar assemblies and the rear connector bar assemblies on the XLCi enclosures before lifting. Never exceed the limitations or maximum recommended load for the pull-up grids. Chain Hoists: Prior to each use, inspect the chain hoist and associated hardware (including motor, if applicable) for any cracks, deformation. Broken welds, corrosion, missing or damaged components that could reduce the hoist strength. [. . . ]