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Loopdrive – User and installation manual
c.
Single (or odd number) twist in loudspeaker cable polarity
If cabling polarity is mismatched in one place in your installation (or more but odd number), Loopdrive will
react with SHORT indication.
What to do?
Reset LDB and observe the following indication:
a.
If LDB returns to SHORT active indication, short circuit is located on the cable section directly connected to
PRIMARY or SECONDARY.
b.
If LDB turns to OPEN active indication, short circuit is located on the loop in the field. You need to take
further steps to locate the faulty section. Two alternative solutions are available:
a.
4EVAC Loopdrive Sniffer (PC application) is the easiest way to go. Use FIM tracking feature for the best
result. FIM tracking is automated procedure which allows you to find the exact location of the short
fault. Please, go to the Loopdrive Sniffer manual for details.
b.
Disconnect loudspeaker cable from SECONDARY output of LDB and put an audio signal in the zone
including faulty loop. Loopdrive will feed the loop with audio signal only from PRIMARY side. While
listening to loudspeakers follow the loop and find first area with no sound reproduction. This area is
isolated from the loop because of the fault. To find the end of isolated section, connect the SECONARY
side back to LDB and find the first area with sound reproduction.
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