Ground Short; Emergency Trigger Inputs; Mains Power; Battery - Bosch Plena Installation And User Instructions Manual

Plena Voice Alarm System | Installation and User Instructions | Configuration
18.5

Ground short

If supervision is enabled and ground short supervision is
switched on (see section 18.1), the system can
continuously monitor loudspeaker lines in the system
for short-to-ground situations. For each loudspeaker
line, short-to-ground supervision can be switched on
and off with the configuration software.
Note
See the Configuration Software Manual
(9922 141 1038x) for more information about
the configuration software.
If a leakage current > 30 + 15 mA is detected in a line,
the line is considered faulty.
18.6

Emergency trigger inputs

If supervision is enabled and input supervision is
switched on (see section 18.1), the system can supervise
the emergency trigger inputs. For each emergency
trigger input, supervision can be switched on and off
with the configuration software.
Note
See the Configuration Software Manual
(9922 141 1038x) for more information about
the configuration software.
18.7

Mains power

If supervision is enabled and mains power supervision is
switched on (see section 18.1), the availability of the
mains power is supervised.
18.8

Battery

If supervision is enabled and battery supervision is
switched on (see section 18.1), the availability of the
back-up power is supervised.
18.9

Message supervision

If supervision is enabled and message supervision is
switched on (see section 18.1), the internal message
manager of the voice alarm controller is supervised.
This message supervision consists of supervision of the
wave player using a check-sum and supervision of the
audio path using a pilot tone.
Bosch Security Systems | 2006-06 | 9922 141 10377 en

18. 1 0 Emergency microphone

If supervision is enabled and emergency microphone
supervision is switched on (see section 18.1), the audio
path and the PTT switch of the emergency microphone
are monitored from the capsule to the connection with
the voice alarm controller.

18. 1 1 Line supervision

18.11.1 Introduction
If supervision is enabled and line supervision (see
section 18.1) is switched on, all loudspeaker lines are
supervised. Line supervision consists of:
• Impedance supervision (see section 18.11.2).
• Short-to-ground supervision (see section 18.11.3).
18.11.2 Impedance supervision
If line supervision is switched on, the voice alarm
controller measures the impedance of all loudspeaker
lines once every 90 seconds (default value). The
reference values for impedance supervision are stored in
the voice alarm controller during the system calibration
(see section 24.3). If a difference of > 15% (default
value) is detected between the measured line impedance
and its reference value, the line is considered faulty. The
default values can be changed with the configuration
software.
Note
See the Configuration Software Manual
(9922 141 1038x) for more information about
the configuration software.
Note
A small click can be heard at the start and end
of an impedance measurement. If the click is
unacceptable, then end of line supervision with
EOL can be considered instead of impedance
supervision.
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