+
If terminal [P] is used, terminal [A] must also have
an 820 ohm resistor.
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 activating
the relay which in turn will latch the Switching Power
supply to the Electrovalve.
+
The current draw of Electrovalves must be provided by
an external power source (e.g. BXM Power Station).
4 - 20 mA Gas detectors 4 - 20 mA Gas detectors
can be connected to terminals [Z1] ONLY on the Main
Board and Expander Module, as per Figure 16b.
Operating principles
The current draw of terminal [S] varies from 4 to 20 mA
in accordance with the concentration of gas present in
the area.
Wiring description
The [–] terminal is the negative power terminal.
Connect a 470 ohm, 2 W (113) between terminal [S]
and terminal [–] of the detector.
Connect [+] terminal (positive power input) to a power
source that can be interrupted for the required reset
time (see terminal [24R] on the Main Board).
+
Terminal [Z1] accepts ONE 4 - 20 mA Gas detec
-
tor ONLY. If you are connecting a 4 - 20 mA Gas
detector to terminal [Z1] of an Expander Module,
remove the Jumper (62) (marked GAS on the
PCB), and ENABLE the Gas Detector option of the
respective zone (i.e. Zone nr. 1 for the Main Board,
Zone nr. 9 for Expander Module nr. 1, zone nr. 17
for Expander Module nr. 2).
INSTALLING THE CONTROL PANEL 31
Figure 16 Wiring diagram of a Gas detector with Normally-Open Output (a)anda4-20mAGasdetector(b):
109) 3900 ohm, 1/4 W EOL Resistor (orange-white-red-gold); 111) 680 ohm resistor; 113) 470 ohm resistor, 2 W; 115)a
680 ohm resistor if the option Double N.O. Gas detector is disabled, or an 820 ohm resistor if the option is enabled;
116) an 820 ohm resistor should be used only if the option Double N.O. Gas detector is enabled
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