FireClass J400REP - Connecting Call-Points; Connecting Gas Detectors

Bypass Missing Detectors If this option is enabled,
the zone concerned will exclude any inoperative (Mis
-
sing) detectors from the system configuration, thus allo
-
wing detectors connected downstream of ‘Missing’ de
-
vices to operate as normal.
Wiring instructions for this feature:
— Connect 1N5819 diodes (or similar) to the power in
-
put and output terminals of all the detectors but the last,
then connect a 1N5819 diode to the power output ter
-
minal and the negative terminal of the last detector (see
part nr. 110 in Figure 14).
+
The polarity of the diodes must be observed (see
Figure 14: the white band on part nr. 110 indicates
the cathode.
The Control panel monitors the system for “Missing” de
-
vices by inverting the polarity (every 60 seconds) of ter
-
minals belonging to zones with the Bypass Missing
Detectors attribute (option ENABLED).
+
Polarity inversion DOES NOT damage the detec
-
tors as, during this status, only a 0.6 V negative vol
-
tage is present on the detector power terminals .
n
Connecting Call-points
This Control panel accepts Normally Open Call-points
with 680 ohm contact resistance (wiring as per Figu-
re 14), and Call-points with zero ohm contact resistan-
ce (wiring as per Figure 15).
Wiring instructions
Connect a 680 ohm (112) resistor in series to the Nor-
mally-Open contact, then connect the series of the
contact with the resistor and the Normally-Open contact
to the zone terminal.
If the Call point is the last device or the zone, connect
the EOL (109) to its NO and C terminals.
Call-point priority The zone concerned will discrimi
-
nate between alarms triggered by Detectors and those
triggered by Call-points. In the event of a Call-point
alarm, the Control panel will generate an instant alarm
regardless of the operating mode of the system (Day or
Night Mode).
Wiring instructions for this feature:
Use Call-points with 270 ohm contact resistance, or
connect a 270 ohm resistor in series to a Call-points
with zero ohm contact resistance, as shown in Figu
-
re 15 (111).
n
Connecting Gas Detectors
This Control panel accepts Gas detectors with Normally
Open Outputs (NO) and 4-20 mA gas detectors.
NO Output Connect Gas detectors with Normally
Open Outputs (NO) as per Figure 16a.
Operating principles:
Terminal [A] (the Detector Alarm Output) will connect to
terminal [–] when the concentration of gas in the area
exceeds the preset safety threshold.
Wiring description:
Using a 680 ohm resistor (115), connect terminal [A] to
the zone terminal.
Connect terminal [+] (the Detector Power input) to a po
-
wer source that can be interrupted for the required reset
time (see terminal [24R] on the Main Board).
Terminal [P] signals the pre-alarm status of the detec-
tor. If this state is to be detected, terminal [P] must be
connected to the zone (refer to Figure 16a) using an
820 ohm resistor (116) and the zone should be pro-
grammed with the attribute Double N.O. Gas detector,
as described under "Zones" in the “PROGRAMMING
FROM A PC" section.
30 Conventional Fire Panels J424/J408
NO
C
Z3
R3
24R
NO
C
NO
C
Zero ohm
call-point
Main board or
Expander board
Main
board
112
NO output
detector
111 111
NO output
detector
109
Figure 15 Wiring diagram of 3 detectors with Normally-Open Outputs and a Call point with zero ohm contact resistan
-
ce: 109) 3900 ohm, 1/4 W EOL resistor (orange-white-red-gold); 111) 680 ohm resistor;
112) 680 ohm resistor (necessary when Call-point priority option is DISABLED) or 270 ohm resistor when Call-point
Priority option is ENABLED).