Cooper Security 9751 Manual de instalación descargar pdf (Pagina 39)

3. Installation

496964 Page 31

FSL Connections

The control unit provides enough connectors for 8 (975x) or 16 (9851) FSL

zones. If you wish to connect more, you must fit one or more hardwired

expanders (see "Connecting Expanders" on page 32). When using expanders

with a 9851, you must decide how many FSL zones to connect to the control

unit. You can have 8 zones on the control unit and 32 on expanders, or 16

zones on the control unit and 24 on expanders.

Each FSL zone is a "Fully Supervised Loop" using a two-wire closed loop. As

shown in Figure 20, 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 21).

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.

Zone 1

Zone 2

2K2 EOL

4K7

Alarm contacts

Tamper contacts

2K2 EOL

4K7

Alarm contacts

Tamper contacts

Figure 20. FSL Connections

Yellow

Violet

Red

Gold

4k7

Red

Gold

2k2

Figure 21. Colour Code for FSL Resistors

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 147 148

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Cooper Security 9751 Manual de instalación Pagina 39

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