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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 4 | Amplifiers en | 170
Proceed as follows:
1 Connect the triangle symbol connector of the MCI
to the triangle symbol connector of the basic
amplifier.
2 Connect the circle symbol connector of the MCI to
the circle symbol connector of the basic amplifier.
10.3.4Ground connection
Connect the ground connection of the unit (see figure
10.2) to the 19 inch rack, which is connected to the
safety ground. For good resistance to electrostatic
discharges (ESD), it is important that the ground
connections of the multi channel interface and the
connected basic amplifiers are interconnected with short
wires, directly or via the rack. Set the signal ground
switch to Grounded in case the audio source is not
grounded to reduce susceptibility to external RF
disturbances. If the audio source already has the signal
ground connected to a safety ground, set the switch to
Floating to avoid ground loops that can be a source of
hum.
10.3.5Connecting the amplifier channels
10.3.5.1 Introduction
An amplifier channel (see figure 10.6) is a group of
outgoing signals that have been processed by the same
amplifier unit of the basic amplifier. The number of
amplifier channels depends on the type of basic
amplifier.
figure 10.5: MCI connections
table 10.2: Number of amplifier channels
Type Amplifier channels
PRS-1B500 1
PRS-2B250 2
PRS-4B125 4
PRS-8B060 8
0
+
0
+
Audio In
MCI
MCI
Audio In
21
Only
––
figure 10.6: Amplifier channel connectors
table 10.3: Amplifier channel connector details
Pin Description
1, 2 Spare amplifier input. See section
10.3.5.3.
3, 4 Loudspeaker line A. See section
10.3.5.2.
5, 6 Loudspeaker line B. See section
10.3.5.2.
Caution
To prevent the hazard of electric shocks, switch
off the basic amplifiers and disconnect the back
up power supplies from the basic amplifiers
before connecting loudspeaker lines and spare
amplifier connections.
Caution
After connecting wires to the amplifier channel
connectors, install the plastic safety bracket.
The plastic safety bracket makes sure that the
amplifier channel connectors cannot be
touched.
A
B
A
B
+–+–+–+–+–+–
Spare In Lsp OutSpare In Lsp Out
1 2