FDP CFN - PART 1 PRELIMINARY REMARKS FOR A CORRECT WORKING; 1.1 LINE CABLE TEST PROCEDURE BEFORE LOOP CONNECTION

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Rev. 1.03
1.1 LINE CABLE TEST PROCEDURE BEFORE LOOP CONNECTION
1.1.1 Line continuity
Check the resistor of line electro conductive cables with tester at 200 Ω of resistor for line
electro conductive cables superior to 40 Ω is too high!!
Possible causes can be:
- the line is too long;
- loose clips;
- false contacts;
- cable of insufficient section;
- partly cut off or damaged cable.
The cables must usually present a resistor between 10 and 15 Ω.
Besides the resistor of the negative cable and the positive one must result similar.
1.1.2 Isolation between + / - of loop
With tester at 20KΩ and the detectors insert, it must measure a about value of the end of line
resistor.
PART 1
PRELIMINARY REMARKS FOR A CORRECT WORKING