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3. Installation
Detector Circuit Connections
The left hand edge of the main PCB provides 14 connectors that can be used
for up to 8 FSL zones, or 8 Closed Circuit zones. During programming use
command 21 to configure these connectors as either CC zones, or two wire
FSL zones.
Closed Circuit Zones
Figure 11 shows how to connect Closed Circuit zones. Note that there is one
tamper loop that serves all zones. The control panel provides enough con-
nectors for eight circuits. If necessary you can connect more zones to a 9954
expander (see "Connecting Expanders").
1
2
3
Zone 1
Zone 2
Global Anti-tamper
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Zone 8
Tamper loop
Zone 1
Zone 2
Alarm contacts
Alarm contacts
Figure 11. Four Wire Closed Circuit Connections
FSL Connections
The control unit zone connectors provide space for up to 8 FSL zones. If
necessary you can connect more FSL zones by using 9954 expanders. Each
FSL zone is a ‘Fully Supervised Loop’ using a two wire closed loop. The loop
uses two resistors of different values to differentiate between ‘Circuit’ and
‘Tamper’ signals: a 2K2 resistor fitted in series at the end of the wired loop
(EOL-End-Of-Line), and a 4K7 resistor fitted across the alarm contact, see
Figure 12.
With the loop in a normal state and the alarm contacts closed (shorting out
the 4K7 resistor), the total resistance of the loop is 2K2. When the alarm
contacts open (removing the short from the 4K7 resistor) the resistance of
the loop increases to 6K9 and the control unit detects an alarm condition. If a
tamper device opens then the loop will be open circuit and the control unit
detects a tamper signal.
To connect a detector to an FSL loop you must wire suitable resistors to the
detector. Always check resistor colour coding before wiring resistors into
circuit, see Figure 12.
The wiring resistance of the cable to the detector (including joints) should be
restricted to a maximum of 100 ohms. The recommended maximum cable
distance per zone is 200 - 300 metres.
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