Velocity Operation Manual
www.velocitydetection.com
71
Troubleshooting
SLC Trouble Finding
The Velocity panel will monitor the SLC for open or short circuit faults. The panel’s SLC isolator monitors for both open and short circuit
faults; the faults are reported as ISOLATOR FAULTS along with a description. The faults reported are:-
Break in +ve wire
To help locate a +ve cable break, re-run
the SLC loop search, and check the
detailed loop report after the search is
complete.
In this example, the break is between
address 154 (which is seen from side A
only), and address 155 (which is seen from
side B only)
(This only applies if the loop is addressed
sequentially)
If a system uses spurs
(Not recommended
for more than a few devices)
, a cable break
in the spur will not be seen. Look for
missing device addresses in the loop
report.
Break in -ve wire
Use the same method as above to locate a
–ve break.
Short circuit on side A
If the panel reports a loop short side A ,
then there is a short circuit fault on the
SLC, somewhere between the panel (side
A), and the first device with a short circuit
isolator on the loop.
