Smart Connect
Single Loop Touch Screen Panel
Doc: GLT-229-7-1
77
Issue: 3
Date: 12/05/2017
A short circuit in
the middle of the
loop, will usually
cause two loop
short circuit
isolators to
activate, and will
cause the devices
between the
isolators to go
missing (as they are
no longer
powered).
The short circuit will be somewhere
between the 2 operated SC isolators. Check
which addresses are missing.
12.2 LOOP CONTENTS FAULT FINDING
If the loop contents are different to what was expected, then there two probable causes:
Two or more
devices may have
the same address
setting. This is
referred to as a
DOUBLE ADDRESS
FAULT. If this
occurs all devices
with the same
address will answer
at the same time.
The panel will not
be able to
understand the
answer it receives
Search the detailed loop report for double
addresses.
Look for missing addresses in the detailed
summary. Missing numbers are likely to be
the double addressed ones.
Try removing the known device & relearn
the loop. If just 2 devices were at that
address, the other device will now be seen,
and the panel will report it`s type, which
may help reduce the search
Cable break
If a system is only wired as a loop, any
breaks will be reported, and can be located
as described in the previous section.
If a system uses spurs, a cable break in the
spur will not be seen. Look for missing
device addresses in the loop report.
Reverse Polarity
Devices
Some devices are polarity sensitive, so will
not be seen if + & - connections are
reversed.
Look for missing devices in the loop report,
and check their
12.3 ZONE FAULTS
There are several reasons for the zone fault LED to light.
A device has been
removed from that
zone.
