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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 4 | Amplifiers en | 160
amplifier, the multi channel interface can receive its
power from the Praesideo system bus instead.
A jumper sets the source of the power supply. The
location of the jumper is shown in figure 9.4. The
jumper has two settings:
• Basic amplifier setting (default)
• Praesideo system bus setting
To receive power from the Praesideo system, set the
jumper to Network Power Supply as shown in figure
9.5.
9.3.4 Connecting the multi channel
interface by-pass
There are two methods to connect the bypass function
of the multi channel interface.
• Bypass from the network controller. If a fatal fault in
the multi channel interface occurs it will route all
audio signals from a network controller output
directly to all basic amplifier channels. During the
bypass routing of the multi channel interface, all
other functions of the multi channel interface are not
supported.
Make the connection as follows:
1 Connect an Audio Out connector from the network
controller to the Bypass In connector of the multi
channel interface.
2 Connect the Bypass Out connector of the multi
channel interface to the next multi channel interface
in the Praesideo system.
3 Make sure that the audio output from the network
controller is always activated as a zone as part of
emergency calls.
4 For supervision of the bypass connection, configure
the network controller to give a 20 kHz signal on the
Audio Out of the network controller. A separate 20
kHz pilot tone detector, connected to the last by-pass
out, can be used to supervise the interconnection of
the bypass connections.
• Bypass from an external source. If a fatal fault in the
multi channel interface occurs, an external audio
output can give an audio signal directly to the basic
amplifier channels. The external source can be a
local microphone that goes through a pre-amplifier.
9.3.5 Connecting control inputs
The multi channel interface has 32 control inputs. The
control inputs can receive signals from third party
equipment that must trigger actions in the Praesideo
system (see section 47.3). The control inputs can be
configured to act on contact make or on contact break
(see section 43.5). It is also possible to supervise the
cables for short-circuits and open connections (see figure
9.6 and figure 9.7). Whether a control input is actually
supervised or not is defined in the configuration.
figure 9.4: Jumper location
figure 9.5: Jumper settings
Warning
To reduce the risk of electric shock do not
perform any servicing other than that contained
in the operating instructions unless you are
qualified to do so. See section 1.2 Intended
audience.
1
Network Power
Supply
Basic Amplifier
Power Supply