
9752 Installation Guide 3. Installation
11976870 Page 21
If you require more zones, fit one or more expanders as explained on page
22). There can be up to 24 zones on expanders.
Control Unit Wiring Type
Zones
8 four-wire CCL with common tamper
8 two-wire FSL
CCL Connections
Figure 11 shows how to connect four-wire CCL zones.
1
2
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. CCL Connections (common tamper)
NOTE: If you use CCL wiring then you must program zone 1 as Normal Alarm
(see 9x5x Programming Manual) and fit a wire link to Zone 1 terminals in
order to enable the global tamper.
FSL Connections
Each FSL zone is a "Fully Supervised Loop" using a two-wire closed loop. As
shown in Figure 12, the loop uses 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) and a 4K7 resistor fitted across the alarm contact.
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 so the control unit detects an alarm condition. If a
tamper device opens, the loop resistance becomes infinite (open circuit) and
so the control unit detects a tamper signal.
To connect a detector to an FSL loop, you must wire suitable high-tolerance
resistors to the detector. Always check resistor colour coding and tolerance
before wiring resistors into circuit (see Figure 13).
The wiring resistance of the cable to the detector (including joints) should not
exceed 100 ohms. The recommended maximum cable length within a zone is
200–300m.
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