32 NFS-320/E/C, NFS-320SYS/E Operations Manual — P/N 52747:E1 06/16/2011
Operation of the Control Panel Operation of Special System Timers
3.12.4 How to Respond to a NAC or Control/Relay Trouble
If the control panel indicates an active NAC or Control/Relay Trouble, take the following action:
1. Press the ACKNOWLEDGE/SCROLL DISPLAY key to silence the panel sounder and switch the
SYSTEM TROUBLE LED from flashing to steady—regardless of the number of troubles, alarms,
and supervisory signals.
2. The control panel sends an Acknowledge message to the History buffer and installed printers,
FDU-80 annunciators, and CRT-2s. Check the trouble message for the location and type of
trouble.
3. Correct the condition causing the trouble.
4. When the trouble condition is corrected, the panel will return to normal operation (indicated by
the “System Normal” message).
5. The control panel sends a “System Normal” message to the LCD display, History buffer and
installed printers, FDU-80 annunciators, and CRT-2s.
3.13 Operation of Special System Timers
3.13.1 What are System Timers?
There are user-programmable time delays for three specific functions: the Auto Silence Timer, the
Alarm Verification Timer, and the Silence Inhibit Timer.
Figure 3.3 shows a sample System
Function Selection screen with system timer settings. For instructions on changing system
functions, refer to the NFS-320 Programming Manual.
3.13.2 How to View System Timer Selections
You can use the Read Status Entry option (explained in Chapter 4) to view the current selection for
the System Timers. To do so, press the keys shown below in sequence:
The LCD display shows the current selections for System Functions, which includes the three
system timers.
Sample LCD display of a System Function screen with system timer selections:
Figure 3.3 Sample System Function Selection Screen
3.13.3 How System Timers Work
The control panel can operate with special system timers: Auto Silence Timer, Alarm Verification
Timer and Silence Inhibit Timer.
Auto Silence Timer
A timer that functions like pressing the SIGNAL SILENCE key. When the Auto Silence Timer reaches
its programmed value (600-900 seconds), the control panel automatically shuts off all active
outputs programmed as silenceable.
Silence Inhibit Timer set to 180 seconds
Auto Silence Timer set to 600 seconds
Alarm Verification Timer set to 30 seconds
SIL INH=180 AUTO=600 VERIFY=30 USA TIME
TERM=N AC-DLY=Y LocT BLINK=01 ST=4 ACS=N
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