Specifications

Bosch Security Systems | 2007-08 | 9922 141 50672en
Plena Loop Amplifier | Installation and User Instructions | Configuration en | 29
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.
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).
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.
• To switch on the limiter, set the AGC/Limiter switch
in the Limiter position. When the limiter is on, AGC
is disabled.
figure 5.3: Supervision switch
figure 5.4: Priority input volume control
On Off
Fault
Supervision
NO
C
NC
AGC
AGC
Limiter 5K 10K
100V
0
Priority input
Note
Do not forget to configure the AGC range (refer
to section 5.7.3).
figure 5.5: AGC/Limiter switch
AGC
AGC
Limiter 5K 10K