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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 4 | Amplifiers en | 173
10.3.5.3 Spare amplifier channel
A spare amplifier channel can be made available as a
back-up channel for all channels of all basic amplifiers.
The only restriction is that all the basic amplifiers must
be connected to the same multi channel interface. The
connection from the spare amplifier channel can be
made as a loop through to all the channels of the basic
amplifiers.
Make sure that the power rating of the spare amplifier
channel is the same as or higher than the power rating
of the main channels.
Spare and main amplifier channels can be part of the
same amplifier. Use a back-up power supply to avoid
that the power supply is a single-point of failure.
A supervision board connected to the last Spare In
connection gives supervision to the spare channel.
If channel 2 in the figure 10.11 has a failure, the spare
channel becomes active and supports all settings of
channel 2. If Channel 1 in the figure 10.11 also has a
failure, the spare channel does not support channel 1,
but remains with channel 2.
To connect the spare channel to the basic amplifier
channels, proceed as follows:
1 Connect the + A Lsp Out from the spare amplifier
channel to the + Spare In connection of Channel N
of the basic amplifier.
2 Connect the - A Lsp Out from the Spare Amplifier
channel to the - Spare In connection Channel N of
the basic amplifier.
3 Make a loop through connection to all channels of
the basic amplifiers that need spare channel back-up.
4 Optional: connect a supervision board to the last
channel Spare In connection.
figure 10.11: Spare amplifier and loudspeaker
connections
figure 10.12: Basic amplifier outputs and spare channel
inputs
Spare input
A
B
Channel 16
Spare input
Channel 1
Channel 2
Signal from active spare
EOL 2A
EOL S
EOL 2B
EOL 1B
EOL 1A
Active spare channel
Channel 1
Spare input
Channel 2
A
B
A
B
A
B
A
B
+–+–+–+–+–+–
Spare In Lsp OutSpare In Lsp Out
1 2