Plena Mixer Amplifier | Installation and User Instructions | Connections and settings
The Tel. emergency/70V input, with VOX functionality,
is used for receiving emergency announcements or
signals (such as a fire alarm). This input has absolute
priority, and will overrule all inputs when an emergency
announcement or signal is received.
Either a telephone line or a 70 V input signal can be
connected to the Euro style pluggable screw terminal
connector (1) at the rear of the unit. See section 18.104.22.168
and section 22.214.171.124.
Never connect telephone lines and a 70 V signal
to the Euro style connector at the same time.
To adjust the volume of the emergency announcement
or signal, turn the rotary dial (2) at the rear of the unit.
For safety reasons, the volume of the emergency
announcement or signal cannot be set to zero.
The master volume control setting (5) does not influence
the volume setting of the emergency announcement or
figure 4.3: Connecting 70 Volt input signal
Bosch Security Systems | 2007-12 | PLE-1MA030-US, PLE-1MA060-US, PLE-1MA120-US en
Tel. emergency input does not mute the
incoming signal so that an incoming pilot tone
will be fed to the zone outputs. With this feature
it is possible to use the mixer amplifier in a
Bosch Voice Alarm System when using end of
line boards (PLN-1EOL).
The signal that is delivered to the unit should be
quiet when a call is not made. The pilot tone and
frequencies below 300 Hz are filtered from the
trigger signal so that the input will not trigger
from a pilot tone or low frequency rumble.
4. 1 .4. 1
Connecting 70 Volt input signal
Connect the 70 Volt input signal as shown in
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