L-Acoustics WST K2 Rigging Manual

L-Acoustics WST K2 Rigging Manual Manual pdf 7 page image

K2_RM_EN_0.5 w w w . l - a c o u s t i c s . c o m 7 / 522 MECHANICAL SAFETY2.1 Mechanical limitsThe K2 rigging system complies with 2006/42/EC: Machinery Directive. It has been designed following the guidelines ofBGV-C1.2006/42/EC: Machinery Directive specifies a safety factor of 4:1 against the rupture. The limits specified in the tablesbelow correspond to deployments with a safety factor of 4:1 or higher. Refer to SOUNDVISION for the safety factorof a specific deployment.The safe limit gives the maximum number of elements for which the safety factor is always compliant with the2006/42/EC: Machinery Directive, regardless of the other deployment parameters (site angles, inter-enclosure angles,etc.).The maximum limit gives the maximum number of elements for which the safety factor can be compliant with the2006/42/EC: Machinery Directive, when the other deployment parameters provide the best mechanical conditions.Ground-stacked Safe limit Maximum limitK2 on K1-SB with K2-BUMP 4 K2 6 K2Flown Safe limit Maximum limitK2-BUMPK2-BUMP + K2-BAR16 K214 K2 + 2 LA-RAK12 K1-SB + 1 LA-RAK24 K224 K2 + 2 LA-RAK16 K1-SB + 2 LA-RAKK2-LINK under K1-BUMP 16 K2 24 K2SOUNDVISION and mechanical safetyTo deploy more elements than the safe limits, or when mixing different type of loudspeaker enclosureswithin the same array, always model the system in SOUNDVISION before installation, and check theMechanical Data section for any stress warning or stability warning.2.2 Assessing mechanical safetyIn order to assess the actual safety of any array configuration before implementation, refer to the following warnings:Rated working load limit (WLL) is not enoughThe rated WLL is an indication of the element resistance to tensile stress. For complex mechanical systemssuch as loudspeaker arrays, WLLs cannot be used per se to determine the maximum number of enclosureswithin an array or to assess the safety of a specific array configuration.Mechanical modeling with SOUNDVISIONThe working load applied to each linking point, along with the corresponding safety factor, will depend onnumerous variables linked to the composition of the array (type and number of enclosures, splay angles)and the implementation of the flying or stacking structure (number and location of flying points, site angle).This cannot be determined without the complex mechanical modeling and calculation offered bySOUNDVISIONAssessing the safety with SOUNDVISIONThe overall safety factor of a specific mechanical configuration always corresponds to the lowest safetyfactor among all the linking points. Always model the system configuration with the SOUNDVISIONsoftware and check the Mechanical Data section to identify the weakest link and its corresponding workingload. By default, a stress warning will appear when the mechanical safety goes beyond the recommendedsafety level.Safety of ground-stacked arrays in SOUNDVISIONFor ground-stacked arrays, a distinct stability warning is implemented in SOUNDVISION. It indicates atipping hazard when the array is not secured to the ground, stage or platform. It is user responsibility tosecure the array and to ignore this warning.Consideration must be given to unusual conditionsSOUNDVISION calculations are based on usual environmental conditions. A higher safety factor isrecommended with factors such as extreme high or low temperatures, strong wind, prolonged expositionto salt water, etc. Always consult a rigging specialist to adopt safety practices adapted to such a situation.