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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 4 | Amplifiers en | 137
8.3.5 Connecting the amplifier channels
8.3.5.1 Introduction
An amplifier channel (see figure 8.4) is a group of
outgoing signals that have been processed by the same
amplifier unit of the power amplifier. The number of
amplifier channels depends on the type of power
amplifier (see table 8.3).
table 8.3: Number of amplifier channels
Type Amplifier channels
PRS-1P500 1
PRS-2P250 2
PRS-4P125 4
LBB4428/00 8
figure 8.4: Amplifier channel connector
table 8.4: Amplifier channel connector details
Pin Description
1, 2, 3 Control outputs contacts. See
section 8.3.5.4.
4, 8 Spare amplifier. See section 8.3.5.5.
5, 9 Loudspeaker line. See section
8.3.5.2.
6, 7 Fixed 50 V line. See section 8.3.5.3.
C
Control Out
Spare In Lsp Out
NO NC 0V 50V
1
9
Caution
To prevent the hazard of electric shocks, switch
off the power amplifiers and disconnect the
back up power supplies from the power
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.