Wiring instructions for this feature:
— Connect
1N5919
diodes (or similar) to the power in-
put and output terminals of all the detectors but the last,
then connect a
1N5919
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
If this option is enabled, the zone
concerned will discriminate between alarms triggered
by Detectors and those triggered by Call-points. In the
event of a Call-point alarm, the Control panel will gene-
rate 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
).
A
IMQ-SECURITY SYSTEMS certification applies
ONLY when
Call-point priority
option is
ENABLED.
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
(
111
), 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] (the Detector Pre-Alarm Output) is not
shown in the wiring diagram.
The Repeat Output of the zone can be set up to inter-
rupt the gas flow in the event of an alarm (wiring as per
Figure 16a — see terminal [R4]).
If zone Z4 generates an alarm (or pre-alarm — when
the
Pre-Alarm on R Output
option is ENABLED), ter-
minal [R4] will pull down to 0 V (negative) thus activa-
ting the relay which in turn will latch the Switching Po-
wer supply to the Electrovalve.
+
The current draw of Electrovalves must be provi-
ded by an external power source (e.g. BXM Power
Station).
30
Conventional Fire Panels
J424/J408
NO
C
Z3
R3
24R
NO
C
NO
C
Zero ohm
call-point
M
ain
bo
ar
d
or
Exp
ander
board
Ma
in
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).
Summary of Contents for J408
Page 1: ...INSTALLATION MANUAL CONVENTIONAL F I R E PA N E L S 424 408...
Page 17: ...IDENTIFICATION OF PARTS 17 C N O N C 36 35 b...
Page 29: ...USER S INSTRUCTIONS CONVENTIONAL F I R E PA N E L S 424 408...
Page 52: ...44 Conventional Fire Panels J424 J408...
Page 61: ...QUICK GUIDE 53...
Page 62: ...54 Conventional Fire Panels J424 J408...
Page 63: ...QUICK GUIDE 55...
