n
Connecting Signalling Devices
NAC1, NAC2 and ALARM outputs are for the alarm si
-
gnalling device connections.
NAC1 and NAC2 can be set up to signal pre-alarm and
alarm conditions (refer to “Outputs” under
“PROGRAMMING FROM A PC”).
The wiring diagram in Figure 18 shows two warning
lamps and the flasher of an outdoor signalling device
(STROBE terminals) connected to NAC2, and two fire
bells and the horn of an outdoor signalling device
(HORN terminals) connected to NAC1. This type of
connection makes it possible to diversify pre-alarm from
alarm signalling.
For example, NAC2 will not activate during the
pre-alarm phase, whereas, NAC1 will activate every 6
seconds for 2 seconds. NAC1 and NAC2 will always be
active during alarm status.
+
A 3900 ohm, 1/4 W resistor (109) must be connec
-
ted between the [+] and [–] terminals of the last de
-
vice connected to NAC1 and NAC2.
A 1N4007 diode (114) (or similar) must be
connected between the [+] terminals of devices
connected to NAC1 and NAC2 and the [+] termi
-
nals of the latter.
n
Connecting a Repeater
Connect the 24V, –, + and M terminals to the respecti
-
ve terminals on the Main Board of the Control panel, as
shown in Figure 17.
+
The maximum wire length connected the RS485 termi-
nals of the Control panel must not exceed 1000 metres.
Connect the - terminal of the Repeater to the Main
Earth wire.
32 Conventional Fire Panels J424/J408
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