Operation of the Control Panel Pre-alarm Event
28 NFS-3030 Operating P/N 51344:C 11/4/03
Pre-alarm Event
The Pre-alarm function is used to receive an early warning of potential or incipient fire conditions.
The Pre-alarm function provides one of two settings as follows:
•Alert – a non-latching setting that causes a Pre-alarm when a detector reaches its programmed
Pre-alarm sensitivity threshold. Non-latching means the condition will automatically
restore to normal once the detector’s sensitivity readings drop below its Pre-alarm
threshold.
•Action – a latching setting that causes a Pre-alarm when a detector reaches its programmed
Pre-alarm level. Latching means the condition will not restore itself to normal once the
detector’s sensitivity readings drop below its Pre-alarm threshold. The panel must be reset.
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.
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
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
PREALARM 120% OF FIRE SENSITIVITY LEVEL4
ELEVATOR LOBBY EAST WING
FIRST FLOOR DOOR SMOKE(PHOTO)
11:58:45A WED JUN 25, 2003 L01D134
EVENT COUNTS
FIRE ALARMS:000 PREALARM:001 TROUBLE:000
SUPERVISORY:000 SECURITY:000 DISABLE:000
11:59:35A WED JUN 25, 2003
ACKNOWLEDGE SIGNAL SILENCE
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