Cooper Security 9853 Guida di Installazione Pagina 23

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496791 17
3. Installation
Detector Circuit Connections
The left hand edge of the main PCB provides 24 connectors that can be used
for up to 16 zones. During programming use command 21 to configure these
connectors as either 4-wire CC zones, two wire FSL, two wire EOL, or two
wire FSL plus expander.
Four Wire CC Connections
Figure 10 shows how to connect four wire CC zones. Note that pairs of alarm
contacts alternate with pairs of anti-tamper contacts. The control panel
provides enough connectors for eight four wire circuits. If you wish to connect
more four wire circuits you must fit one or more 9954 expander cards (see
"Connecting Expanders").
Alarm contacts
Zone 1
Tamper contacts
1
3
2
4
Zone 2
Zone 1
Zone 2
Figure 10. Four Wire Closed Circuit Connections
FSL Connections
The control unit zone connectors provide space for up to 16 FSL zones. If
necessary you can connect more FSL zones by using 9954 expanders. If you
choose to use expanders then you must decide how may zones to connect to
the control unit: 8 or 16. See "4. Programming - Zone Configuration (Com-
mand 21)". You can have either 8 zones on the control unit and the rest on
expanders, or 16 zones on the control unit and the rest on 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 11.
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 resistance 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.
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