Praesideo 3.5 Installation and User Instructions 4 Amplifiers

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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.

1

figure 9.4: Jumper location

Network Power

Supply

Basic Amplifier

Power Supply

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.

9.3.4Connecting 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:

1Connect an Audio Out connector from the network controller to the Bypass In connector of the multi

channel interface.

2Connect the Bypass Out connector of the multi channel interface to the next multi channel interface

in the Praesideo system.

3Make sure that the audio output from the network controller is always activated as a zone as part of

emergency calls.

4For 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.

9.3.5Connecting 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

9.6and figure 9.7). Whether a control input is actually supervised or not is defined in the configuration.

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Bosch Appliances 3.5 manual Connecting the multi channel interface by-pass, Jumper location
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