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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] 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. For example, 5:1 safety factors are fairly common amongst rigging manufacturers because many regulatory agencies call for a minimum safety factor of 5:1. When an XLC loudspeaker system is installed where local regulations only require a safety factor of 5:1, Electro-Voice insists that the working-load limits of the XLCi rigging never be exceeded and that an 7:1 safety factor be maintained for the XLCi loudspeakers. The user is cautioned that some local regulations may require safety factors higher than 7:1. In that circumstance, Electro-Voice insists that the user maintain the higher safety factor as required by the local regulations throughout the entire XLCi installation. 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. Discussion of Array Examples: For example, if the top enclosure in a column was angled down 30°, the enclosure working-Ioad-versus-angle limit from the simplified structural-rating guidelines shown in Figure 7 would indicate that a total of 1820 pounds (885 kg) could be safely suspended. This would include the weight of the top enclosure plus all of the enclosures and rigging suspended below. [. . . ] Broken welds, corrosion, missing or damaged components that could reduce the hoist strength. 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. [. . . ]