Interlogix FlexZone Series, Product Manual

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Chapter 4: Maintenance
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FlexZone™ Product Guide
cable installation. (Excessive noise can be identified by a high clutter signal on a
connected UCM.) In particular, ensure that there is no inadvertent ground
connection to the coaxial cable shield at a splice connection or terminator. Verify
that the center conductor and shield have not been swapped at the terminal
blocks.
Adjusting the Target Filters
Each cable side includes both a high pass and a low pass filter which can be
used to screen out some sources of nuisance alarms. Before adjusting the
Target Filters, verify that the fence is not loose and that there are no objects or
vegetation that can contact the fence in strong winds. The default value for the
high pass filter is 10 Hz, the default value for the low pass filter is 40 Hz.
Figure 75: Linking relays to cable segments
• If you are encountering an unacceptably high NAR during moderate to strong
winds, increase the high pass filter slightly and continue monitoring for
nuisance alarms. If you increase the high pass filter, you should also increase
the low pass filter by the same value to ensure that there is adequate
bandwidth for reliable detection.
• If you have a very stable fence and would like to increase the detection
sensitivity, you can lower the high pass filter. If you do lower the high pass
filter, monitor the fence to ensure that the NAR has not increased.
• If you are encountering detection problems (low sensitivity) rather than
nuisance alarms, the most likely source of the problem is the sensor cable.
Sensor cable problems typically result from improper conditioning, handling
damage, or incorrect installation. Review the current clutter level to see if
there are any areas of the cable where the clutter signal is particularly high.
Repeat the profiling procedure and compare it to the original cable profile.
Once you have determined the location of the cable problems, correct the
problems by reconditioning the cable, or repairing the damaged section with a
cable splice, or correcting any installation problems.
Note: If you adjust the Target Filters or make any cable repairs, always reprofile
and retest the sensor cable.
Replacing the processor
The processor PCB is mounted inside the enclosure on four standoffs.
high pass filter low pass filter