APPLICATION GUIDE
30
Base sounder device not wired correctly. When a detector is inserted onto a base sounder there is not much room
behind the detector. If the cabling is not cleared from the base, see images below.
Incorrect Correct
Figure 16
The detector may be pushed away from the base preventing the switch opening, or crushing a contact and thus not
receiving power. Spur isolator wired incorrectly. See wiring diagram for spur isolator.
2. Open circuit” Positive/Negative
This means after the auto-learn the panel has detected a break in the positive or negative line. The most likely causes
would be:-
Device wired incorrectly. See wiring diagram.
Base switch opening but the detector not making contact. Ensure the base contacts are correctly screwed down, and
none are damaged. Then ensure the detector is replaced
correctly.
A negative break may also be caused by a short at a device in
the middle of the loop that the loop device isolators have
detected and dealt with. See short circuit middle below.
If the loop voltage drops (below 18 vDC) the devices may reset
causing an open circuit negative. (There must not be more than
2Km of appropriate properly earthed cable used per loop.) If a
faulty device is suspected it can be seen by linking the loop in the
panel and disconnecting the far end of the loop, see diagram.
Measuring the voltage across the end of the loop for correct
function this should be over 15V (usually over 18V). If the panel is
left in this state the end devices will go into fault. The faulty
device should be one of the active devices.
Figure 17
CF3000 / DF6000 / FX6000 Application Guide
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