Honeywell NFS Supra Installation And Operating Manual page 28

NFS Supra
Connecting Call Points
Alarm call points are connected to the zone line by means of a 5.1V/0.25w Zener Diode (not supplied).
PUL-VSN call points include this Zener Diode.
NFS Supra control panels can support an unlimited number of call points in each zone but,
according to EN54-14, no more than 10 MCPs may be connected to one zone.
So that the NFS Supra control panels can identify MCP alarms (Alarm LED steady), each normally open
(NO) switch contact must be connected in series with a diode Zener of 5.1 V (minimum 1/4W) between
positive and negative of the line as shown in the drawing.
Alternatively, it is possible to use a resistor 470Ω > R > 1kΩ in series connection with call points.
Connect the end of line (EOL) 47μF capacitor or 4K7 Ω (RFL mode) between positive and
negative of the line after the last device.
Connecting autonomous Detectors with Alarm and Fault contact relay
Autonomous conventional detectors as aspiration systems, beam detectors, sensor cable
control panels, etc. have an alarm relay and a fault relay for connection to alarm circuits as a
conventional zone.
To connect these devices to the conventional zone line the detector alarm relay should be
connected in normally open (NO) mode, in series with the alarm resistor or 5V zener between
positive and negative as shown in the drawing.
The detector fault relay must be connected in normally closed (NC) mode in series with the end
of line (EOL or RFL), between positive and negative, as shown in the drawing.
HLS-MN-025 v.04
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C NO
Zener 5V
C NO
470 Ω
to 1K
min max
+
Fault Contact (NC)
Fault
C NC
470 Ω
to 1K
min max
C NO
Alarm
+
Installation and Operating Manual
Installation
47 µF Capacitor
MCP Contact (NO)
-
47 µF Capacitor
Alarm Contact (NO)
-
Page 28