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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 4 | Amplifiers en | 182
11 Single loudspeaker line
supervision
11.1 Introduction
Single loudspeaker line supervision is only available for
the PRS-xPxxx power amplifiers and not for the basic
amplifiers.
The LBB4442/00 Line Supervision Set contains a
supervision-master PCB and a supervision-slave PCB.
With this set, it is possible to supervise the end of a
loudspeaker line.
The supervision-master PCB must be installed on the
output board of the amplifier channel that must be
supervised, whereas the supervision-slave must be
connected to the last loudspeaker in the loudspeaker
line that must be supervised.
So, for each loudspeaker line, one set is needed. The
supervision-slave is powered from the 20 kHz pilot tone
of the power amplifier and communicates inaudibly
with the supervision-master via the loudspeaker lines.
No additional wiring is required. Faults in the
loudspeaker lines are reported within 100 s.
Communication is not affected by the audio signals on
the loudspeaker lines.
The use of multi-wire cables is not recommended in
combination with line supervision because crosstalk
between audio channels may influence the line
supervision.
Note
Use multiple loudspeaker line supervision (see
chapter 12) to supervise the ends of branches in
loudspeaker lines and the loudspeakers
themselves.
Note
For the line supervision set to work correctly it is
necessary to set the amplifiers to 70 V or 100 V
output. The 50 V setting is not allowed.
Because certification for the EN54-16 standard
has only been performed on the 100 V output of
the Praesideo amplifiers, the installer shall only
use the 100 V outputs of Praesideo for
emergency sound systems in Europe.