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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 4 | Amplifiers en | 172
The loudspeaker lines can be connected in three
different ways depending on the level of supervision
and redundancy required.
If loudspeaker lines A and B are in the same area,
connect the loudspeaker lines as shown in figure 10.8.
This method has full supervision and redundancy. The
A and B relays are normally closed and supervision
boards (see sections 12.2.2 and 12.2.3, indicated with
EOL) are connected to both the A and B groups.
• If an amplifier overload occurs, then the multi
channel interface will control the A and B relays to
isolate the overload and keep the other group
working.
• If a line fault is detected by the supervision boards in
one of the groups, the affected group will be
switched off. A fault event for group A or group B
will be generated.
If loudspeaker lines A and B are in different locations,
connect the loudspeaker lines as shown in figure 10.9.
This method has no redundancy. Both A and B relays
are normally closed.
• If a line fault is detected by the supervision boards in
one of the groups, the group remains live.
• Only if an overload is detected, the affected group
will be switched off. A fault event is generated.
If loudspeaker lines A and B must form a class-A loop,
connect the loudspeaker lines as shown in figure 10.10
Both A and B outputs use the same loudspeaker group.
The A relay is normally closed and B relay is normally
open.
• If a line fault occurs, detected by the supervision
board (EOL), the relay B closes and a fault event is
generated to indicate the switch over.
• If the cable is broken, the A output gives power to all
loudspeakers that are before the break, the B output
gives power to all loudspeakers to the other side of
the break.
• If a short-circuit or overload causes the line fault, the
amplifier generates a fault event.
figure 10.8: Output A and B in the same area
figure 10.9: Output A and B in separate areas
Pilot
Spare In
A
B
EOL
EOL
Pilot
Spare In
A
B
EOL
EOL
figure 10.10: Class-A loop from output A to B
A
B
EOL
Pilot
Spare In