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Loudspeakers Line Isolator System
3.2
System description
The products of the Loudspeakers Line Isolator System are connected to the public address/
voice alarm system by making use of the so-called loop wiring method (see following figure
and table):
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Figure 3.1: Simplified system overview
No. Item
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2
3
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6
There are three different ways to install the Isolator Boards in the loudspeaker line:
1.
2.
3.
Bosch Security Systems B.V.
2
3
4
4
3
Zone output of public address/voice alarm system
Master Unit
Loudspeaker loop (one loop shown)
Isolator Board
Loudspeaker
DC Blocking Board
Each loudspeaker is connected to an Isolator Board in the loudspeaker line. In this case,
the Isolator Board is mounted in very close proximity to the loudspeaker. See Installation
option 1: One Isolator Board for each loudspeaker, page 21.
A branch consisting of one or more loudspeakers is connected to the tap-off connection
on an Isolator Board. In this case a DC Blocking Board must be connected to each
loudspeaker (maximum 20 watt loudspeaker load).
If open-circuit detection is required for this option, the open-circuit detection jumper on
the Isolator Board should be set to ON, and the end-of-line resistor should be installed in
the last loudspeaker of the branch. See Installation option 2: Branch of loudspeakers
connected to an Isolator Board, page 23.
One or more loudspeakers are connected in a segment or segments. In this case a DC
Blocking Board must be connected to each loudspeaker (maximum 20 watt loudspeaker
load). See Installation option 3: Loudspeakers connected between Isolator Boards, page
25.
Installation and Operation Manual
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System overview | en
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2014.03 | V1.1 |
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