Supervision; Fault Contact; Priority Input; Agc/Limiter - Bosch PLN-1LA10 Installation And User Instructions Manual

Security systems plena loop amplifier
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Plena Loop Amplifier | Installation and User Instructions | Configuration
5.4

Supervision

You can switch supervision (refer to section 1.5) on and
off with the Supervision switch. The Supervision switch
is on the rear of the loop amplifier (refer to figure 5.3).
To switch on supervision, set the Supervision switch
in the ON position.
To switch off supervision, set the Supervision switch
in the OFF position.
NO
figure 5.3: Supervision switch
5.5

Fault contact

You can configure the fault contact with the Supervision
switch (refer to section 5.4).
If supervision is off, the internal relay is de-energized
(NO position).
If supervision is on and the loop amplifier operates
correctly, the internal relay is energized
(NC position).
If supervision is on and the loop amplifier does not
operate correctly, the internal relay is de-energized
(NO position).
5.6

Priority input

You can set the volume of the audio signal that the
priority input sends to the connected induction loops
with the Priority input volume control. The Priority input
volume control is on the rear of the loop amplifier (refer
to figure 5.4).
Priority input
AGC
figure 5.4: Priority input volume control
Bosch Security Systems | 2005-05 | 9922 141 50672en
Fault
Supervision
C
NC
On
Off
AGC
Limiter 5K 10K
100V
0
5.7

AGC/Limiter

5.7.1

Introduction

Automatic gain control (AGC) keeps the level of the
audio signal on the connected induction loops constant.
The limiter makes sure that audio signals with a strength
of more than 0 dBV are not sent to the connected
induction loops.
5.7.2

Switch on and off

You can switch automatic gain control (AGC) on and
off with the AGC/Limiter switch. The AGC/Limiter
switch is on the rear of the loop amplifier (refer to figure
5.5).
To switch on AGC, set the AGC/Limiter switch in the
AGC position. When AGC is on, the limiter is
disabled.
Note
Do not forget to configure the AGC range (refer
to section 5.7.3).
To switch on the limiter, set the AGC/Limiter switch
in the Limiter position. When the limiter is on, AGC
is disabled.
AGC
AGC
figure 5.5: AGC/Limiter switch
en | 29
Limiter
5K 10K

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