Bosch Plena Voice Alarm System Installation And Operation Manual page 153

Plena Voice Alarm System
Clause / Requirement
13.14.1 The VACIE may have provision for at least
one spare power amplifier. In this case:
a
NOTE - This can be achieved, for example, by
switching or by permanently connected parallel
amplifiers.
b
13.14.2 Every fault of an amplifier shall be
indicated by a general fault warning indicator as
specified in .2
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.
Bosch Security Systems B.V.
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;
the spare power amplifier(s) shall have at
least the same functionality and output
power as the replaced amplifier.
Installation and Operation manual
Compliance
The Plena Voice Alarm System has a
minimum of one main amplifier and one
call amplifier. It has a maximum of one
main amplifier per router and one spare
amplifier per router (including the router
built in the controller). Each router of the
Plena Voice Alarm System has an input
for connecting a spare amplifier channel.
It also contains switch-over relays to
switch the loudspeaker load from the
original amplifier output to the spare
amplifier output. A spare amplifier
channel assignment is configurable to
multiple routers (in single channel
mode).
After fault detection of an amplifier all
loudspeaker lines are switched
automatically to the spare amplifier (if
connected and configured) within 10 s.
Each router of the Plena Voice Alarm
System has a spare amplifier input. The
installer is responsible for proper
installation and configuration of the
amplifiers to match amplifier power and
load. Plena Voice Alarm System takes
care of input signal switching to the
spare amplifier channel. This way the
spare power amplifier(s) will have the
same functionality and output power as
the replaced amplifier.
All Plena Voice Alarm System 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 LED.
The spare amplifiers are continuously
supervised, supervision is identical to the
main (call) amplifier.
The supervision is active whilst the Plena
Voice Alarm System is powered by either
the mains or standby power supplies.
Note: the spare amplifiers in the Voice
Alarm System are used as background
music amplifiers (if so configured).
9922 141 1037x (V2.16) | V0.6 | 2011.09
| en 153
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