50 NFS2-3030 Operations Manual — P/N 52546:N1 06/20//2014
Operation of the Control Panel Operation of Special System Timers, Presignal, and PAS
Silence Inhibit Timer
This timer disables the SIGNAL SILENCE and RESET key function for the programmed time (MM:SS
seconds) when a fire alarm occurs. A Silence Inhibit Timer starts at the first fire alarm. A panel
reset is required to re-enable this timer. It can be set with a value from 0 (the timer is disabled) to 5
minutes.
Auto Silence Timer
This timer functions like pressing the SIGNAL SILENCE key. When the Auto Silence Timer reaches
its programmed value (0, 10 minutes, 15 or 20 minutes, with the setting = 20 for Canadian installa-
tions), the control panel automatically shuts off all active outputs programmed as silenceable.
2.14.2 Presignal
Presignal is a feature that initially delays activation of outputs with ZF0 in their zone map until the
Presignal timer has expired. This feature allows for the initial sounding of outputs only in specific
areas, monitored by qualified personnel. To participate in Presignal, inputs and outputs must
include Special Zone ZF0 in their zone map. The Presignal timer is programmed to a value from 60
to 180 seconds.
How the Panel Indicates a Presignal Alarm
When an initiating device participating in Presignal goes into alarm, the panel LCD displays a fire
alarm message. (Refer to Section 2.2, “Fire Alarm Event”, on page 25.) If a second alarm occurs
while the Presignal timer is counting down, the control panel aborts the Presignal timer countdown
and activates all programmed outputs. The fire alarm LED flashes and the panel sounder pulses a
steady tone. The control panel latches until the alarm is corrected and the
SYSTEM RESET key is
pressed to reset the panel.
How to Respond to a Presignal Alarm
Once the Presignal timer has begun counting down, the operator has the duration of the countdown
time to respond to the alarm before the control panel automatically activates all outputs with ZF0 in
their zone map and CBE linkage to the alarm. The operator can reset the panel if the alarm is deter-
mined false, or press DRILL to evacuate the building immediately.
2.14.3 PAS (Positive Alarm Sequence)
PAS (Positive Alarm Sequence), used in conjunction with Presignal, allows a 15-second time
period for acknowledging an alarm signal from a fire detection/initiating device. If the alarm is not
acknowledged within 15 seconds, all programmed outputs activate. If the alarm is acknowledged
within 15 seconds, the control panel will enter Presignal mode as described above.
The PAS Inhibit switch can be used to turn off the PAS delay timer when the control panel is unat-
tended.
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