Cooper Security 9651 Manuel d'installation télécharger pdf (Page 16)

3. Installation 9651

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Cabling for Keypads

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

for wiring keypads. You can connect the keypads in either a star or bus

configuration. 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.

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

keypad 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 keypads at the end of a single cable run. You may be

able to improve on these figures by spreading keypads along the cable length.

8-core 7/0.2 cable

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

One 200 –

Two 100 200

Three 65 130

Four 50 100

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

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

When carrying out the cabling, there are two important points to remember:

1. Do not connect anything other than keypads to the bus. The keypad bus

power supply is limited to a maximum of 400mA.

2. Check between 0V and 12V on the keypad bus at the point furthest from

the control unit: the voltage must be at least 12.0VDC when all the keypad

backlights are on.

Note: The following instructions assume that you have already run all the

necessary cabling.

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Cooper Security 9651 Manuel d'installation Page 16