EVA -2082S/920 - Manual (Page 2)

Electro-Voice® EVA Series User Manual
Table of Contents
Rigging-Safety Warning ....................................................................................................................................................3
1.0 Introduction ..................................................................................................................................................................4
2.0 Tool List ......................................................................................................................................................................7
3.0 Designing an EVA Array ...........................................................................................................................................7
3.1 Applications for which EVA Arrays are Most Appropriate ...................................................................7
3.2 Typical Number of Arrays .............................................................................................................................7
3.3 Determining EVA Array Configuration with EVADA TM (EVA Design Assistant) Software .............8
3.4 Other Design Examples ............................................................................................................................ 14
3.41 Dealing with the Relatively High Low-Frequency Variation of Short Arrays.................. 14
3.42 A Five-Module Array Example .................................................................................................. 15
3.43 An Eight-Module Array Example ............................................................................................. 16
4.0 Preparing EVA Modules for Installation ................................................................................................. 17
4.1 Recommended Preflight Procedures .................................................................................................... 17
4.2 Module Configuration ................................................................................................................................ 17
5.0 EVA Rigging System ............................................................................................................................................... 20
5.1 Overview of the EVA Flying System ....................................................................................................... 20
5.2 Deciding which Grid Configuration to Use with an EVA Array ........................................................ 21
5.21 Standard Grid with or without Second Spreader Bar ....................................................... 21
5.22 Extended Grid with or without Second Spreader Bar ....................................................... 22
5.23 Use of Two Standard Grids ...................................................................................................... 23
5.3 Assembling and Flying an EVA Array ..................................................................................................... 24
6.0 Rigging-Strength Ratings and Safety Factors .................................................................................................. 25
6.1 Working-Load Limit and Safety Factor Definitions ............................................................................. 25
6.2 Structural-Rating Overview ...................................................................................................................... 26
6.3 Simplified Structural-Rating Guidelines ................................................................................................ 27
6.4 Electro-Voice Structural-Analysis Procedures .................................................................................... 30
7.0 Rigging Inspection and Precautions ................................................................................................................... 31
8.0 References ................................................................................................................................................................ 32
8.1 Rigging (Printed) ........................................................................................................................................ 32
8.2 Mechanical Engineering (Printed) .......................................................................................................... 32
8.3 Rigging (Websites) .................................................................................................................................... 33
Notes .................................................................................................................................................................................. 34
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