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Electro-Voice EVA Series User Manual

6.0 Rigging-Strength Ratings and Safety Factors

6.1 Working-Load Limit and Safety factor Definitions

The structural ratings for all of the EVA 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 ulti-

mate-break strength. Electro-Voice chooses to present the structural-load ratings of the EVA 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 WORKING-LOAD LIM-

ITS OF ANy OF THE RIGGING COMPONENTS OR COMPLETE LOUDSPEAKER SySTEMS

DESCRIBED IN THIS MANUAL.

The working-load limits for the EVA rigging components and complete loudspeaker systems described

in this manual are based on a minimum 8:1 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 a working-load limit of 1,000 lb (454

kg), it would not structurally fail until a force of at least 8,000 lb (3,629 kg) was applied, based on an 8:1

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 EVA products on a minimum of an 8:1 safety factor.

Other manufacturers of rigging components may base their working-load limits on safety factors other

than 8:1. 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 EVA 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 EVA rigging never be exceeded and that an 8:1

safety factor be maintained for the EVA loudspeakers.

The user is cautioned that some local regulations may require safety factors higher than 8:1. In that cir-

cumstance, Electro-Voice insists that the user maintain the higher safety factor as required by the local

regulations throughout the entire EVA installation. It is the responsibility of the user to make sure that any

EVA installation meets all applicable local, state or federal safety regulations.

Содержание EVA-1151D

Страница 1: ...Electro Voice EVA Series User Manual EVA Series User Manual EVA 2082S 906 EVA 2082S 920 EVA 2082S 126 EVA 2082S 1220 EVA 1 151D EVA 2151D...

Страница 2: ...the EVA Flying System 23 5 2 Deciding which Grid Configuration to Use with an EVA Array 24 5 21 Standard Grid with or without Second Spreader Bar 24 5 22 Extended Grid with or without Second Spreader...

Страница 3: ...practices as commonly recognized in the United States and is believed to be accurate at the time of original printing As such the information may not be directly applicable in other countries Further...

Страница 4: ...ade by constructing one array with its modules turned upside down with respect to the views of Figure 1 Each EVA full range module contains two separate vertically stacked line array elements splayed...

Страница 5: ...wn either above or behind an EVA full range array This is a rectangular unit with special tie plates that allow for assembly with either zero or five degrees of splay between modules It may also be us...

Страница 6: ...NOTE series 2 grids EVA SG2 EVA EG2 are required to fly EVA sub woofer modules Older grids EVA SG EVA EG are for flying EVA full range modules ONLY EVA GXB BLK and EVA GXB WHT optional second spreader...

Страница 7: ...906 or EVA 2082S 126 dimensioned views Figure 1b EVA 2082S 920 or EVA 2082S 1220 dimensioned views Bottom View Front View Top View Right View Left View Rear View Spreader Bar Attach Holes Bottom View...

Страница 8: ...troduction cont Figure 1c EVA 1151D dimensioned views Figure 1d EVA 2151D dimensioned views Front View Top View Right View Left View Rear View Spreader Bar Attach Holes Front View Top View Right View...

Страница 9: ...r four box array in a venue with a flat floor is to have a line running through the intersection of the top two modules intersect the head of the person in the last row This situation is shown in Figu...

Страница 10: ...elligibility of the sound system EVADA displays coverage in three frequency bands The default bandwidth is one third octave The de fault frequencies are 500 Hz 3 000 Hz and 8 000 Hz 3 000 Hz is very i...

Страница 11: ...ance This button appears in the Main Cluster geometry view immediately under the words MAIN CLUSTER GEOMETRY The module vertical aiming angles are also displayed with a different colored slightly spla...

Страница 12: ...3 000 and 8 000 Hz vertical polar responses shows that maximum array output is aimed at the rear most heads not at the rear wall 2 The lower modules will be attenuated This is required because the lo...

Страница 13: ...ADA spreadsheet with a side view of the array and its suspen sion The array is drawn to scale in feet or meters as selected in the Units tab on the Venue page English or metric respectively The grid t...

Страница 14: ...and assess the inevitable multiple source interference that occurs when two or more arrays are displaced horizontally This is done by showing the horizontal polar response of subwoofer arrays at thre...

Страница 15: ...TM Cable Loss tab calculates the dB level lost in speaker wiring as a function of the wire gauge AWG and length The Notes tab is a place to enter comments on the particular design The Supported Produc...

Страница 16: ...ly short 4 7 ft three module array The variation at 100 Hz not shown is even greater falling from 9 dB at the front to 2 dB at the rear This means that if the sound is well balanced at point B a likel...

Страница 17: ...y of the five module array keeps excess energy off the low ceiling and results in improved intelligibility throughout the venue while maintaining over fourteen feet of clearance from the floor to the...

Страница 18: ...e main array Bottom of the array is too low and coverage uniformity has suffered as a result even with a second EVA AM installed Figure 9c The same venue with subwoofers flown behind the main array on...

Страница 19: ...impedance if two of the modules have attenuation modules installed A solution is to use two amplifier channels one for the top four modules and one for the bottom four In order to preserve the pre dic...

Страница 20: ...te array the high frequency HF shading or use of the optional attenuation modules should be noted In this way these settings and options can be configured on the systems as they are rigged together an...

Страница 21: ...assembly by removing its eight holding screws with a Phillips 2 screwdriver The cable assembly that connects the input panel s green PC board to the crossover equalizer network inside the EVA module i...

Страница 22: ...A input panel removed showing green PC board and the four bosses to which the optional EVA AM attenuation module will be attached Figure 13 EVA input panel with EVA AM installed showing connector plug...

Страница 23: ...S 1220 short throw modules producing 6 13 or 20 between any two modules depending on which modules are attached together The specific selection of long and short throw modules and their arrangement is...

Страница 24: ...eader bar has three 0 813 inch 20 6 mm holes through it one near each end and one in the center to which the chain hoist s or other device s used to lift the array into position can be attached Using...

Страница 25: ...xtended grid is probably a better choice when using front to back pickup points Figure 16 EVA SG2 standard grid with optional EVA GXB spreader bar 5 22 Extended Grid with or without Second Spreader Ba...

Страница 26: ...ds may also be used with an EVA array one attached to the upper module and the other attached to the lower module acting as a pull up grid This is a way to achieve extreme down angles such as might be...

Страница 27: ...a stand alone subwoofer hang if only minimal down angle is required See Figure 20 Note that EVA 1151D tie plates may be used as a suspension grid ONLY in conjunction with an EVA GXB spreader bar sold...

Страница 28: ...econd module into place under the suspended module between the tie plates 4 Align the holes in the tie plates with the corresponding holes in the lower module and assemble to the one above with four M...

Страница 29: ...d not structurally fail until a force of at least 8 000 lb 3 629 kg was applied based on an 8 1 safety factor However the user should never apply a load to that part that exceeds 1 000 lb 454 kg The s...

Страница 30: ...enclosure and the forces acting on each rigging accessory grids and spreader bars will vary with each array configuration Determining those forces throughout an array requires complex mathematical cal...

Страница 31: ...modules from an EVA SG2 or EVA EG2 grid subwoofers must always be at the TOP of the array with NO SPLAY BETWEEN MODULES 2 If a second grid is used at the bottom of the array the angle between the susp...

Страница 32: ...e 21 Side to side simplified structural rating guide lines for EVA arrays angle shown exaggerated for illustration purposes Figure 22 Side to side angular pull structural rating guidelines for EVA spr...

Страница 33: ...point as long as the maximum pull angle between suspension lines does not exceed 60 3 When flying FIVE or more EVA 2151D modules use only the two outermost attachment holes on the spreader bar If two...

Страница 34: ...2082S 2082S 2082S 1151D 5 2082S 2082S 2082S 2082S 2082S 2082S 6 2082S 2082S 2082S 2082S 2082S 7 2082S 2082S 2082S 8 2082S 2082S Position 1151D modules over 2082S modules on EVA EG2 grid 720 lb 327 kg...

Страница 35: ...151D 1151D 6 1151D 1151D 1151D 7 1151D 1151D 8 1151D Position Stand alone array of 1151D modules on EVA EG2 grid 720 lb 327 kg max column weight any pin hole any angle 1 Top 1151D 1151D 1151D 1151D 11...

Страница 36: ...e of the art computer modeling programs for structural analysis throughout the development of loudspeaker systems The computer modeling enables the complex forces in the rigging components and enclosu...

Страница 37: ...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 l...

Страница 38: ...oderick Bascom Rope Company Rigger s Handbook Sedalia MO USA 1993 8 MacWhite Wire Rope Company Catalog of Tables Data and Helpful Information Kenosha WI USA 1991 9 Acco Chain Lifting Division Chain Sl...

Страница 39: ...Electro Voice EVA Series User Manual 39 8 0 References cont 8 3 Rigging Web sites 1 http www rigging net 2 http www cmworks com 3 http catalog thecrosbygroup com maininterface htm Notes...

Страница 40: ...0 392 3497 Fax 800 955 6831 Europe Africa and Middle East only For customer orders contact Customer Service at 49 9421 706 0 Fax 49 9421 706 265 Other Internatonal locations For customer orders Contac...

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