Cooper Security 9751 Manuel d'installation télécharger pdf (Page 30)

3. Installation

Page 22 496964

Cabling Keypads and Expanders

Cooper Security recommends that you use 8-core 7/0.2 or 16/0.2 alarm cable

for wiring keypads and expanders. You can connect the keypads and

expanders in either a star or bus configuration (see Figure 9). If you intend to

use long cable runs, Cooper Security recommends that you use star wiring

with no more than 200m of cable per branch.

Control Unit

Keypads or expanders

Distribute devices along

cable for better performance.

200m

200m 200m

200m200m

Figure 9. Star and Bus Wiring for Keypads and Expanders

The maximum length of any one run from the control unit to the most remote

keypad or expander depends on the number of items connected to the cable.

You can double the maximum length for 7/0.2 cable by using two cores each

for the 0V and 12V terminals or by using 16/0.2 cable. The table below shows

the maximum recommended cable lengths in metres for 7/0.2 cable,

assuming that you connect all items at the end of a single cable run. (An item

is either a keypad or an expander.) You may be able to improve on these

figures by spreading items along the cable length (Figure 9).

8-core 7/0.2 cable

Number of items 1 core 2 cores on 0V and 12V

One 200 –

Two 100 200

Three 65 130

Four 50 100

Five 40 80

Six 33 66

Seven 28 56

Eight 25 50

It is possible to extend the keypad cable run by using additional power

supplies, but only up to the recommended maximum of 200m.

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Cooper Security 9751 Manuel d'installation Page 30