NFS2-3030 Operations Manual — P/N 52546:A 11/29/2005 31
Pre-alarm Event Operation of the Control Panel
Alert and Action settings are set individually with detector point programming. Individual detector
sensitivity threshold settings can have a value of one through nine, and are set by the programmer.
A sensitivity threshold setting of zero indicates the detector does not participate in prealarm.
For more detailed information on Pre-alarm, refer to this panel’s programming manual.
2.4.1 How the Control Panel Indicates a Pre-alarm
When a detector activates a Pre-alarm, the control panel does the following if there are no higher
priority unacknowledged events:
• Pulses the panel sounder (if the piezo is enabled)
• Flashes the
PRE-ALARM LED
•Displays
PREALARM in the upper left corner of the LCD, as well as the sensitivity reading, the
type code and other information specific to the detector as shown in Figure 2.5.
• Sends a Pre-alarm message to the History buffer, installed printer and annunciators.
When an unacknowledged event with a higher priority exists, the control panel retains indications
of the higher priority event (the message, lit LED, audible tone, etc.) while flashing the
PRE-ALARM
LED and sending a Pre-alarm message to the History buffer, installed printer and annunciators.
The Pre-alarm screen display is the same for both alert and action conditions. Following is a sample
screen for a Pre-alarm message.
Figure 2.5 Sample Pre-alarm Message
2.4.2 How to Respond to a Pre-Alarm Warning
If the control panel indicates a Pre-alarm, the operator can do the following:
1. Press the ACKNOWLEDGE soft key to acknowledge the Pre-alarm.
2. Press the MORE INFORMATION soft key to display the MORE INFORMATION screen and
view additional information on the device and possibly preprogrammed text for recommended
action. (Refer to Figure 1.7 on page 17 for an example of this screen and an explanation of its
fields.)
3. Investigate and correct the condition causing the Pre-alarm.
NOTE: An Alert Pre-alarm automatically restores to normal when the detector sensitivity drops
below the programmed Alert level.
PREALARM 120% OF FIRE SENSITIVITY LEVEL4
ELEVATOR LOBBY EAST WING
FIRST FLOOR DOOR SMOKE(PHOTO)
11:58:45A WED AUG 24, 2005 L01D134
EVENT COUNTS
FIRE ALARMS:000 PREALARM:001 TROUBLE:000
SUPERVISORY:000 SECURITY:000 DISABLE:000
11:59:35A WED AUG 24, 2005
ACKNOWLEDGE SIGNAL SILENCE
MORE INFORMATION SYSTEM RESET
PROGRAM/ALTER STATUS MAIN MENU
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