Checking Line Resistance; Checking The Line Continuity - Siemens FS20 Commissioning, Maintenance, Troubleshooting

16.4.2 Checking line resistance

16.4.3 Checking the line continuity

Building Technologies
Fire Safety
Commissioning control panel with collective detector lines
To check the line resistance, a universal measuring instrument with internal
resistance of >20 kΩ/V, a voltage range of 15 V to 30 V, and a resistance range
of 10 kΩ to 10 MΩ is required.
ϖ The ↑ 'Station' is in operation and the display shows the 'Line fault' error
message.
1. Switch the ↑ collective detector line off:
– Switch off the 'Zone' that is assigned to the collective detector line. The
'Zone' and the physical collective detector line are then switched off at the
same time. Link [➙ 82]
2. Switch the collective detector line on:
– Switch on the 'Zone' that is assigned to the collective detector line. The
'Zone' and the physical collective detector line are then switched on at the
same time. Link [➙ 83]
3. Check the following with regard to the appearance of the error message:
– If the error message reappears within approx. 30 s., check the end-of-line
element for the following criteria: Correct end-of-line element, visual check
for corrosion, resistance value (3.3 kΩ or. 4.7 kΩ), tolerances.
– If the error message reappears at a resistance value of 3.3 kΩ and 4.7 kΩ
hours, days or weeks later, check the line specifications, base contacts and
'Detectors' for creeping short-circuit or open line. The ↑ detector line could
be in the gray zone.
4. Once a recognized error has been rectified, switch the collective detector line
off and on again; see point 1.
5. If the error message reappears, continue with the tests and measurements in
the following chapters.
1. Switch the ↑ collective detector line off:
– Switch off the 'Zone' that is assigned to the collective detector line. The
'Zone' and the physical collective detector line are then switched off at the
same time. Link [➙ 82]
2. Remove all 'Detectors' from bases and put base covers in their place.
3. Remove the wires from the connections on the ↑ line card.
4. Release the end-of-line element from the connection terminal.
5. Create a short-circuit at the end of the ↑ collective detector line.
6. Use the ohmmeter or a test buzzer to check for continuity at the maximum
permitted line resistance.
7. Rectify a recognized fault.
8. Reinsert the end-of-line element, rectify the short-circuit and reinsert the
'Detectors'.
9. Switch the collective detector line on:
– Switch on the 'Zone' that is assigned to the collective detector line. The
'Zone' and the physical collective detector line are then switched on at the
same time. Link [➙ 83]
Troubleshooting procedure
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2016-06-02
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