70 en | Configuration Plena Voice Alarm System
9922 141 1037x (V2.16) | V0.6 | 2011.09 Installation and Operation manual Bosch Security Systems B.V.
Short-circuit supervision
If line supervision is switched on, the voice alarm controller continuously monitors all
loudspeaker lines in the system for short-circuits.
If a short-circuit is detected, the line output of the short-circuited line is isolated and shut
down within 200 ms. The system will remain operational. If the line is dual-redundant
connected (A and B), the short-circuited line remains operational as well.
When a ground short occurs, first check the 0 V and 100 V connections from the amplifier to
the Voice Alarm Controller. If these connections are incorrect, then a short fault can occur at
unpredictable times.
6.3 Voice alarm controller
6.3.1 VOX configuration
The type of source that is connected to the mic/line input with VOX functionality is set using
the Mic/Line switch on the rear of the voice alarm controller (see Figure 6.3).
– If the source is a microphone, put the switch in the Mic position.
– If the source is a line-level source, put the switch in the Line position.
Figure 6.3 VOX input source switch
The mic/line input with VOX functionality is configured using DIP switches on the rear of the
voice alarm controller (see Figure 6.4). By default, all switches are in the OFF position.
Figure 6.4 VOX settings
The settings that can be made using the DIP switches are explained in a table on the rear of
the voice alarm controller (see the following table).
Table 6.6 Vox settings
The volume of the mic/line input with VOX functionality is set with the VOX volume control
(see Figure 6.5).
Figure 6.5 VOX volume control
Off On
1 VOX activated by mic. VOX activated by VOX switch.
2 Speech filter. Flat.
3 Phantom power Off. Phantom power On.
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