Schneider Electric FX 3NET Manual de Serviço descarregar pdf (Página 19)

Installation Instruction 66571764GB3 Fire Detection 19

Schneider Electric Pelco Finland Oy Kalkkipellontie 6, 02650 Espoo, Finland Telephone: +358 10 446 511 Fax: +358 10 446 5103 www.pelco.com/nordic

Document Number 66571764GB3 16 2012

10. Cable handling and preliminary measurements

WARNING!

Check by measuring that there is no power in the cables.

10.1 Cable handling and measurements

At every stage of commissioning, power must be

disconnected from the control panel before the cables are

installed.

First disconnect the battery then the

mains.

1. Peel off the cable plastic and protective shields. Be careful

not to let peeling remains drop onto the component board

or between the back wall of the cabinet and the

component board.

Loop 2

A+ A-

Loop 2

B+ B-

Loop 1

A+ A-

Loop 1

B+ B-

PO 2

+24V-

PO 1

+24V-

>1MΩ

Loop 2

A+ A-

Loop 2

B+ B-

Loop 1

A+ A-

Loop 1

B+ B-

PO 2

+24V-

PO 1

+24V-

>1MΩ

2. Make sure that the cables have been marked and that the

markings can be seen after the peeling.

3. If the cables used are shielded, measure, before

connecting the shield that the resistance between the

shield and the cabinet ground exceeds 1 MΩ. If the

resistance is smaller, the cable shield is in contact with the

construction of the building:

- The outer sleeve of the cable has been damaged.

- The protective shield is in connection to the

construction of the building in a detector socket.

Repair the fault. Then connect the cable shield to the

cabinet ground.

4. Measure for each cable: the resistance between the cable

shield and the wires. The resistance must exceed 1 MΩ. If

the value is smaller, the earth leak must be located and

repaired.

5. If the cables used are not shielded, measure the

resistance between the wires and cabinet ground. It must

also exceed 1 MΩ.

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