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Installation Instruction 66571764GB3 Fire Detection 27

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

12. Conventional detector lines

12.1 Measuring the Cables

1. Disconnect all power from the control panel.

2. Measure the resistance between the wires of the conventional

line cable. Set the meter to low voltage resistance measurement

(not diode measurement).

Depending on connected devices the result should be:

- If all devices are normally open (NO) types and no EOL

resistor is connected the meter should indicate a break in the

line

- If all devices are normally open (NO) types and an EOL

resistor is connected the meter should indicate the value of

the EOL resistor.

- If some devices are normally closed (NC) types the meter

should indicate the parallel connection of the series

resistances of those devices

If the resistance meter indicates other values, the cause of the

fault must be located. (It may be a detector connected the wrong

way or a short circuit in the conductors).

3. Short-circuit the wires of the conventional detection line cable at

the control panel during measuring.

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

detection line terminals to which the cables are to be connected.

5. Take the end-of-line resistor with you and walk to the end of the

line and measure the resistance between the wires of the cable.

The maximum allowed resistance is 100 Ω (50 Ω if the line goes

through an Exi barrier). If the resistance is 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. Connect the end-of-line resistors to their respective places (the

last detector or manual call point of the line or the end-of-line unit

box connected after the last device).

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Schneider Electric FX 3NET Manual de Serviço Página 27