Ampcontrol VAA, User Manual

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VOICECOM USER MANUAL ISSUE 4
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Pre-Start Warning Tone
There are 8 different pre-start tones available. The same tone can be used for both
LINE 1 and LINE 2, or a different tone can be selected for each line. On a long wall
installation, for example, LINE 1 would run along the AFC and LINE 2 would run
along the BSL and monorail. Different tones could be set for each line. A table of
tone frequencies and cadences is shown in the Specifications section of this manual .
Pre-Start OK Current Threshold
The Pre-Start OK Current Threshold is the minimum amount of current every VAA
unit must draw from its battery while sounding a pre-start alarm. The current
threshold is used to verify that the VAA has sounded the pre-start alarm. It can be
set from 30mA to 180mA in 10mA steps. This parameter can be used to detect
whether one or both of a VAA’s two speakers have failed. While sounding a pre-
start alarm the VAA will draw a certain amount of current with both speakers functioning. If one speaker fails, the
current drawn will be approximately half the value drawn if both speakers were functioning. If both speakers fail, a
negligible amount of current is drawn. 130mA is a suitable current threshold.
The consequence of a VAA drawing less than the threshold current during a pre-start alarm is that the VAA will not
confirm the pre-start alarm. The procedure is the same for LINE 2. Typical pre-start alarm battery current draw values
can be found in the Specifications section of this manual.
Use the following form to note down all the commissioned VCA configuration settings and keep this form in safe
place. This record will save time if the VCA is replaced.
6 VCA Configuration
____________________
Line 1 Pre-Start
Warning Tone # :[ 1]
6 VCA Configuration
____________________
Line 1 Pre-Start OK
I Threshold :[150mA]