Presignal and Positive Alarm Sequence (PAS) Operation Appendix A: Special Zone Operation
NFS-640 Operations Manual P/N 51334:B 10/03/2003 63
How to View Presignal and PAS Selections
You can use the Read Status Entry option to view the current selection for the Presignal function. To do
so, press the keys in sequence:
Note: For instructions on programming the Presignal function, refer to the NFS-640 Programming Manual.
The LCD display shows the current selections for the Presignal function. The figure below shows a
sample LCD display of a Presignal function selected for PAS and a Presignal Delay Timer of 60
seconds:
Figure 49 Sample Read Status for Presignal Function
Note: If any monitor modules are programmed with a PAS INHIBIT Type Code and a fire alarm occurs, zone F0 goes
false and aborts the Presignal Delay Timer.
How to Respond to an Alarm with a Presignal Delay Timer (no PAS)
If an alarm occurs with a Presignal Delay Timer (60-180 seconds), the control panel displays the type of
device and the SLC address of the device causing the alarm. If a second alarm occurs during the
Presignal Delay Timer, the control panel aborts the Presignal Delay Timer and activates all programmed
outputs. A sample Alarm screen for a monitor module is shown below:
Figure 50 Sample Alarm Display Screen
The
FIRE ALARM LED flashes and the panel sounder pulses a steady tone. The control panel latches until
the alarm is corrected and you press the S
YSTEM RESET key to reset the control panel. You have the
duration of the Presignal Delay Timer (60-180 seconds) to respond to the alarm before the control panel
automatically activates all outputs programmed to F0. You can take the following actions:
• To silence the panel sounder and change the
FIRE ALARM LED from flashing to steady, press
the
ACKNOWLEDGE/SCROLL DISPLAY key.
• To abort the Presignal Delay Timer, turn off the panel sounder and all silenceable output
circuits and light the
SIGNALS SILENCED LED by pressing the SIGNAL SILENCE key.
• To manually activate all outputs programmed to F0, press the
DRILL key. The Manual
Evacuate screen appears, the panel sounder pulses and the
FIRE ALARM LED changes from
flashing to steady. The Manual Evacuate screen and Alarm screen display alternately at
3-second intervals.
Continued on the next page...
Status Off
Presignal Function status banner
Presignal Delay=60
Seconds
PAS selected
Zone F00
OFF PRESIGNAL FUNCT PRESIGNAL DELAY
DELAY-060 PAS=YES FOO
Status banner ALARM
Type Code
MONITOR
SLC address of the
activated initiating device
First zone in the CBE list
(blank if no zone listed)
ALARM: MONITOR MODULE ADDR 1M147
Z004 10:14A 071401 1M147
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