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Unity
has been developed to replace talking sounders in
many voice alarm applications, and is available in several
forms. The DAU is a complete VA system in a single wall
mount box which is complete with messages, fire
interface, dual 30W monitored amplifiers, power supply,
monitored battery charger and the ability to connect non
monitored paging and music directly.
The
DAU has been developed to draw the minimum of
current in standby conditions and mutes the music when
the AC supply fails, the unit then draws 60mA quiescent
allowing the use of 3.2AH commodity SLA batteries for full
compliance with
5839pt8.
Connection
to fire alarm systems could not be more
simple, Unity DAU has independent Alert and Evacuate
inputs which can be connected to reverse monitored
sounder circuits directly. Once activated the fire signals
need to be delatched by the reset input, for retrofit to
systems with relays a protected 24V aux supply is
available.
The
speaker lines are monitored using a low current DC
system which is continuous, and works with the music
playing. Faults reported are open, short and earth faults.
Each speaker fitted to Unity DAU must have a DC blocking
capacitor fitted. The use of DC monitoring allows all cable
types (MICC and soft skin) to be used with
the system.
Music
sources can be plugged directly into
the DAU, and the level of this can be set
using a remote DC volume control. When
used with a paging microphone, the music
ducks
and restores gently after paging.
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