slow whoop tone, which shall slowly ascend from low (500 hertz) to high
(1200 hertz), and shall be constantly repeated until interrupted by either
the digitalized voice message, the microphone input, or the alarm silence
mode as specified. Each slow whoop cycle shall last approximately 4
seconds. The tone generator shall be single channel with an automatic
backup generator per channel such that failure of the primary tone
generator causes the backup generator to automatically take over the
functions of the failed unit and also causes transfer of the common trouble
][2.2.13.4
Protection Circuits
Each amplifier shall be constantly supervised for any condition which could
render the amplifier inoperable at its maximum output. Failure of any
component shall cause automatic transfer to a designated backup amplifier,
illumination of a visual "amplifier trouble" indicator on the control
panel, appropriate logging of the condition on the system printer, and
other actions for trouble conditions as specified.
]][2.2.14
Video Display Unit (VDU)
**************************************************************************
NOTE: Contact the EFD or Engineering Field Activity
(EFA) Fire Protection Engineer to determine if a VDU
is to be provided.
**************************************************************************
a.
The VDU shall be the secondary operator-to-system interface for
data retrieval, alarm annunciation, commands,and programming
functions. The desk mounted VDU shall consist of a CRT monitor
and a keyboard. The VDU shall have a [300] [430] [_____] mm [12]
[17] [_____] inch minimum [touch] screen, capable of displaying 25
lines of 80 characters each. Communications with the FACP shall
be supervised. Faults shall be recorded on the printer. Power
required shall be 120 VAC, 60 Hz from the same source as the fire
alarm control panel.
b.
To eliminate confusion during an alarm situation, the screen shall
have dedicated areas for the following functions:
(1)
Alarm and returns to normal
(2)
Commands, reports, and programming
(3)
Time, day, and date
c.
Full English language shall be used throughout to describe system
activity and instructions. Full English language descriptors
defining system points shall be 100 percent field programmable by
factory trained personnel, alterable and user definable to
accurately describe building areas.
d.
Alarms and other changes of status shall be displayed in the
screen area reserved for this information. The following
information shall be provided in English:
(1)
Condition of device (alarm, trouble, or supervisory).
(2)
Type of device (manual pull, waterflow, etc.)
SECTION 13855N
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