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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 4 | Amplifiers en | 189
12 Multiple loudspeaker line
supervision
12.1 Introduction
Multiple loudspeaker line supervision is available for
the amplifiers as follows:
• PRS-1P500 Power Amplifier
• PRS-2P250 Power Amplifier
• PRS-4P125 Power Amplifier
• PRS-1B500 Basic Amplifier
• PRS-2B250 Basic Amplifier
• PRS-4B125 Basic Amplifier
• PRS-8B060 Basic Amplifier
Use the LBB4440/00 Supervision Control Board,
LBB4441/00 Loudspeaker Supervision Board and
LBB4443/00 EOL Supervision Board for multiple
loudspeaker line supervision. With these boards, it is
possible to supervise up to 80 loudspeakers in a
loudspeaker line including the ends of the various
branches in the loudspeaker line.
The LBB4441/00 Loudspeaker Supervision Boards
check if loudspeakers are intact, whereas the
LBB4443/00 EOL (End of Line) Supervision Boards
check if the loudspeaker lines are intact. Both types of
boards are powered from the 20 kHz pilot tone of the
Power Amplifier and communicate inaudibly with the
LBB4440/00 Supervision Control Board, which controls
the communication between Praesideo and the
supervision boards. No additional wiring is required
Communication is not affected by the audio signals on
the loudspeaker lines. Faults in the loudspeakers and
loudspeaker lines can be reported within 100 s. The use
of multi-wire cables is not recommended in
combination with line supervision because crosstalk
between audio channels may influence the line
supervision.
The Power Amplifiers have one Supervision Control
Board LBB4440/00 per channel. The addresses of the
connected EOL and loudspeaker supervision boards
must be unique for that channel.
Multiple loudspeaker line supervision for the basic
amplifiers PRS-xBxxx do not need the LBB4440/00
Supervision Control Board. The basic amplifiers work
in co-operation with the multi channel interface that
already contains the Supervision Control Board
function for all connected basic amplifiers. Use the
LBB4441/00 and the LBB4443/00 Supervision boards
as required. No Supervision Control Boards need to be
installed into the basic amplifiers.
For basic amplifiers, the addresses in the address range
are shared between all the connected amplifier channels
that use the same multi channel interface.
Make sure that all EOL and loudspeaker supervision
boards that are connected via the basic amplifiers to the
same multi channel interface have unique addresses.
Note
Multiple loudspeaker line supervision is not
possible in combination with LBB4428/00
Power Amplifiers.
Note
For the loudspeaker supervision board or EOL
supervision board 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.