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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | EN54-16: 2008 en | 54
13.14 Redundant power amplifiers
(option with requirements)
Praesideo is compliant.
13.14.1 The VACIE may have provision for at least one
spare power amplifier. In this case:
Each power amplifier channel of the Praesideo system has
an input for connecting a spare amplifier channel. It also
contains a switch-over relay to switch the loudspeaker load
from the original amplifier output to the spare amplifier
output. A spare amplifier channel assignment is
configurable to multiple main amplifier channels.
a in the event of the failure of a power amplifier, the faulty
amplifier shall be capable of being replaced
automatically with a spare amplifier within 10 s of the
fault being detected;
After fault detection of an amplifier all loudspeaker lines are
switched automatically to the spare amplifier (if connected
and configured) within 10 s.
NOTE - This can be achieved, for example, by switching or
by permanently connected parallel amplifiers.
b the spare power amplifier(s) shall have at least the
same functionality and output power as the replaced
amplifier.
Each power amplifier channel of the Praesideo system has
a spare amplifier input. The installer shall take care of
proper installation and configuration of the amplifiers to
match amplifier power and number of channels per
amplifier. Praesideo takes care of input signal switching to
the spare amplifier channel, including adaptive sound
processing. This way the spare power amplifier(s) will have
the same functionality and output power as the replaced
amplifier.
13.14.2 Every fault of an amplifier shall be indicated by a
general fault warning indicator as specified in 8.2
All Praesideo power amplifiers are supervised for overload,
overheating, short-circuit, ground short and amplifier
defect. If any such fault is detected it is indicated both by
means of the general fault warning indicator and by means
of an individual fault report.
13.14.3 Supervision of the spare amplifier(s) shall be
maintained during the functional condition whilst the VACIE
is powered by either the mains or standby power supplies.
The spare amplifiers can be continuously supervised,
whether it is in idle or active state; this is configurable.
The supervision is active whilst the Praesideo system is
powered by either the mains or standby power supplies.
Clause / Requirement Compliance Signature