Plena Loop Amplifier | Installation and User Instructions | Table of contents
Table of contents
Important safeguards ...................................................................................................................................................3
Acknowledgements.......................................................................................................................................................4
About this manual .........................................................................................................................................................5
Table of contents ...........................................................................................................................................................7
1. System overview ...........................................................................................................................................................9
1.1
Loop amplifier ...........................................................................................................................................................................9
1.2
Induction loop systems ..........................................................................................................................................................9
1.2.1
Introduction .........................................................................................................................................................................9
1.2.2
Principle ...............................................................................................................................................................................9
1.2.3
Benefits ............................................................................................................................................................................. 10
1.3
Plena ....................................................................................................................................................................................... 10
1.4
Block diagram ....................................................................................................................................................................... 10
1.5
Supervision ............................................................................................................................................................................ 10
1.6
Quadrature system .............................................................................................................................................................. 10
1.7
1.7.1
Front view ......................................................................................................................................................................... 12
1.7.2
Rear view .......................................................................................................................................................................... 12
2. Design and planning ................................................................................................................................................. 13
2.1
Introduction ............................................................................................................................................................................ 13
2.2
System types ......................................................................................................................................................................... 13
2.2.1
Simple system ................................................................................................................................................................. 13
2.2.2
Quadrature systems ....................................................................................................................................................... 13
2.2.3
Expanded quadrature systems .................................................................................................................................... 15
2.2.4
Low-spill system .............................................................................................................................................................. 15
2.3
Induction loops ..................................................................................................................................................................... 16
2.3.1
Introduction ...................................................................................................................................................................... 16
2.3.2
Position ............................................................................................................................................................................. 16
2.3.3
Wire diameter .................................................................................................................................................................. 16
2.3.4
Magnetic field strength .................................................................................................................................................. 16
2.3.5
Connection ....................................................................................................................................................................... 16
2.3.6
Configuration ................................................................................................................................................................... 16
2.4
Potential problems ............................................................................................................................................................... 18
2.4.1
Metal loss ......................................................................................................................................................................... 18
2.4.2
Overspill ............................................................................................................................................................................ 18
2.4.3
Earth loops ....................................................................................................................................................................... 18
3. Installation ................................................................................................................................................................... 19
4. External connections ................................................................................................................................................ 21
4.1
Induction loops ..................................................................................................................................................................... 21
4.2
Audio inputs .......................................................................................................................................................................... 21
4.3
Priority input ........................................................................................................................................................................... 22
4.4
Fault output ............................................................................................................................................................................ 23
4.5
Line output ............................................................................................................................................................................. 23
4.6
Power supply ......................................................................................................................................................................... 23
4.7
Slave to Master ..................................................................................................................................................................... 25
4.8
Slave to slave ........................................................................................................................................................................ 25
5. Configuration .............................................................................................................................................................. 27
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