Schneider Electric FX 3NET Manual de servicio descargar pdf (Pagina 32)

Installation Instruction 66571764GB3 Fire Detection 32

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

13. Monitored output lines

13.1 Measuring the cables and connecting the end-of-line resistors

1. Disconnect all power from the control panel.

2. Measure the resistance between the monitored output line

cable wires so that the resistance meter positive (feeding)

measuring end is in the “–“ wire of the line. The resistance

meter must indicate a break. If the resistance meter

indicates a resistance value, the cause of the fault must

be located. (It may be an alarm device connected the

wrong way, a serial diode missing from the alarm device

or a short circuit in the conductors).

Loop 2

A+ A-

Loop 2

B+ B-

Loop 1

A+ A-

Loop 1

B+ B-

PO 2

+24V-

PO 1

+24V-

3. Short-circuit the monitored output line cable wires at the

control panel during measuring.

4. Disconnect the end-of-line resistors from those monitored

output line outputs to which the cables are to be

connected.

5. Measure the resistance between the wires of the cable at

the last alarm device or end-of-line unit box in each

monitored output line with the resistance meter. The

allowed resistance should not be more than 300 Ω

depending on the current consumption of the alarm

devices connected to the same line (See picture on the

right). If the resistance is considerably higher, there is a

break in the line (did you remember short-circuit the cable

wires at the control panel). Locate the breaks and

eliminate them.

6. Take the end-of-line resistors to their respective places

(the last alarm device of the line or the end-of-line unit box

connected after the last alarm device) and connect them.

Note!

There must not be other resistors or end-of-line units in the

monitored output line.

<300Ω

4k7

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Schneider Electric FX 3NET Manual de servicio Pagina 32

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