Instruction Manual
DN-6856:A • 12/01/06 — Page 3 of 9
speed also allows the NFS-640 to have the largest device per
loop capacity in the industry — 318 points — yet every input and
output device is sampled in less than two seconds. The micro-
processor-based FlashScan® detectors have bicolor LEDs that
can be coded to provide diagnostic information, such as device
address during Walk Test.
Intelligent Sensing
Intelligent sensing is a set of software algorithms that provide
the NFS-640 with industry-leading smoke detection capability.
These complex algorithms require many calculations on each
reading of each detector, and are made possible by the very-
high-speed microcomputer used by the NFS-640.
Drift Compensation and Smoothing: Drift compensation
allows the detector to retain its original ability to detect actual
smoke, and resist false alarms, even as dirt accumulates. It
reduces maintenance requirements by allowing the system to
automatically perform the periodic sensitivity measurements
required by NFPA 72. Smoothing filters are also provided by
software to remove transient noise signals, such as those
caused by electrical interference.
Maintenance Warnings: When the drift compensation per-
formed for a detector reaches a certain level, the performance of
the detector may be compromised, and special warnings are
given. There are three warning levels: (1) Low Chamber value,
usually indicative of a hardware problem in the detector; (2)
Maintenance Alert, indicative of dust accumulation that is near
but below the allowed limit; (3) Maintenance Urgent, indicative of
dust accumulation above the allowed limit.
Sensitivity Adjust: Nine sensitivity levels are provided for
alarm detection. These levels can be set manually, or can
change automatically between day and night. Nine levels of pre-
alarm sensitivity can also be selected, based on predetermined
levels of alarm. Pre-alarm operation can be latching or self-
restoring, and can be used to activate special control functions.
Self-Optimizing Pre-Alarm: Each detector may be set for
“Self-Optimizing” pre-alarm. In this special mode, the detector
“learns” its normal environment, measuring the peak analog
readings over a long period of time, and setting the pre-alarm
level just above these normal peaks.
Cooperating Multi-Detector Sensing: A patented feature of
this intelligent sensing is the ability of a smoke sensor to con-
sider readings from nearby sensors in making alarm or pre-
alarm decisions. Without statistical sacrifice in the ability to
resist false alarms, it allows a sensor to increase its sensitivity to
actual smoke by a factor of almost two to one.
Field Programming Options
Autoprogram is a timesaving feature of the NFS-640. It is a
special software routine that allows the NFS-640 to “learn” what
devices are physically connected and automatically load them in
the program with default values for all parameters. Requiring
less than one minute to run, this routine allows the user to have
almost immediate fire protection in a new installation, even if
only a portion of the detectors are installed.
Keypad Program Edit (with KDM-2) The NFS-640, like all
NOTIFIER intelligent panels, has the exclusive feature of pro-
gram creation and editing capability from the front panel keypad,
while continuing to provide fire protection. The architecture
of the NFS-640 software is such that each point entry carries its
own program, including control-by-event links to other points.
This allows the program to be entered with independent per-
point segments, while the NFS-640 simultaneously monitors
other (already installed) points for alarm conditions.
VeriFire® Tools is an offline programming and test utility that
can greatly reduce installation programming time, and increase
confidence in the site-specific software. It is Windows® based
and provides technologically advanced capabilities to aid the
installer. The installer may create the entire program for the
NFS-640 in the comfort of the office, test it, store a backup file,
then bring it to the site and download from a laptop into the
panel.
ENTER PROG OR STAT PASSWORD, THEN ENTER
<ESCAPE TO ABORT> *****
Above: Keypad program editing.
Below: Autoprogram function.
VeriFire ToolsSystem Programming screen
0=CLR 1= AUTO 2=POINT 3=PASSWORD 4=MESSAGE
AUTOPROGRAM PLEASE WAIT
L1:80 DETS, 15 MODS L2:93 DETS, 35 MODS
PANEL OUTPUTS:24 BELLS: 04
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