UNITY DAU User Guide & Log Book
Batteries
The Unity DAU requires 2 number 12V 3.2AH sealed lead acid batteries to provide backup power in the
event of mains failure as defined in BS5839pt8 for 24 hours standby and 30 minutes operation.
For 72hour standby and 1 hour operation 2 number 12V 17AH batteries are required, these will need to
be fitted in an external battery enclosure, the monitored charger in the Unity DAU is capable of charging
and monitoring these batteries.
Safety Information:
Sealed Lead acid batteries contain sulphuric acid which can cause burns if
exposed to the skin, the low internal resistance of these batteries means large
currents will flow if they are accidentally short circuited, causing burns and a risk
of fire- exercise caution when handling batteries.
Power Up Procedure:
Always apply mains power before connecting batteries, do not commission
Unity DAU on batteries, as the high inrush current required by the power supply
may rupture the battery fuse.
Always connect the Positive (Red +) terminal first.
Power Down Procedure
Disconnect the batteries before removing the mains power; always remove the
negative (Black – terminal) first
.
Caution Speaker circuits carry 100V AC
Disconnect before servicing to prevent Shock hazards
Speaker Circuits on Unity are DC monitored
.
Suitable speakers for Unity MUST have a thermal fuse to disconnect the speaker if it is
in the area in fire and a DC blocking capacitor fitted, typically the capacitor is 2.2uF 250V
DC.
NOTE! If music is to be broadcast on the Unity DAU an appropriate PRS Licence should be obtained
within the UK.
The Unity DAU is designed and manufactured in the UK by
Current Thinking Ltd,
Unit 91 Silver Briar
Enterprise Park East,
Sunderland,
SR5 2TQ.
Document DCC UND 7002-01 Rev 1 June 2005
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