Pre-Alarm Warning Mode Of Operation; How The Control Panel Indicates A Pre-Alarm Warning; How To Respond To A Pre-Alarm Warning; Pre-Alarm Alert And Action Levels - Notifier NFS-640 Operation Manual

Pre-Alarm Warning Mode of Operation

Pre-Alarm Warning Mode of Operation

NFS-640 Operations Manual P/N 51334:B 10/03/2003
Technical Manuals Online! - http://www.tech-man.com

How the Control Panel Indicates a Pre-Alarm Warning

The control panel activates a Pre-Alarm Warning if a detector exceeds the programmed Pre-Alarm Alert
or Action level. When a detector activates a Pre-Alarm, the control panel does the following:
• Pulses the panel sounder
• Flashes the -
PRE ALARM
• Activates the Pre-Alarm zone (F9)
• Sends a Pre-Alarm message to the LCD display, History buffer and installed printers, terminal
mode LCD-80s, and CRT-2s
• Displays a
PREALARM
(Alert or Action) on the LCD display, along with information specific to the device as shown
in Figure 13.

How to Respond to a Pre-Alarm Warning

Pre-Alarm Alert and Action Levels

The Pre-Alarm function is a programmable option which determines the system's response to real-time
detector sensing values above the programmed setting. Use the Pre-Alarm function if you want to get an
early warning of incipient or potential fire conditions. The Pre-Alarm function provides one of two
levels of Pre-Alarm as follows:
Note: For detailed information on Pre-Alarm applications, refer to the NFS-640 Programming Manual.
• Alert – a non-latching condition that causes a Pre-Alarm when a detector reaches the
programmed Pre-Alarm level.
• Action – a latching condition that causes a Pre-Alarm when a detector reaches the programmed
Pre-Alarm level.

Responding to a Pre-Alarm Warning

The Pre-Alarm screen display is the same for both alert and action conditions. Following is a sample
screen for a Pre-Alarm message.
Status banner
Extended 12
PREALM SMOKE(PHOTO) INTENSIVE CARE UNIT
character
EASTERN WING
custom label
Shows the detector has reached 55% of the
programmed Pre-Alarm level. The 55% is a
real-time display and tracks smoke levels
Figure 13 Sample of an Alert Pre-Alarm Message
An Alert Pre-Alarm automatically restores to normal when the detector sensitivity, programmable to
one of nine settings, drops below the programmed Alert level. Zone F09 automatically clears when no
Pre-Alarm conditions exist.
An Action Pre-Alarm latches until you reset the system - even if the detector sensitivity drops below the
Action level. Zone F09 activates - but Zone Z00 (general alarm) and the trouble and alarm relays do not
activate. The fifth zone programmed, not the first four, in the detector's CBE activates. A subsequent
alarm condition for this detector clears the Action indication from the LCD display.

Interpreting Pre-Alarm Type Codes

The Type Code that displays in the Pre-Alarm warning indicates the function of the point that initiates
the Pre-Alarm warning. Refer to the Detectors section of Table 4 for the Type Codes that can appear in
a Pre-Alarm warning, and for descriptions of those Type Codes.
firealarmresources.com
LED
status banner, the Type Code of the detector, and the Pre-Alarm level
Type Code
055%/4 03:20P 071401 1D147
Time and date of trouble
Detector programmed for a Pre-Alarm level of 4
3. Operation of the Control Panel
Custom descriptor for
this device location
Device address
31