User's Manual

C•CURE Watch Installation and Service Guide B-5
Troubleshooting Tips
The following suggestions may help troubleshoot
passage reader performance in unusual situations.
Existing Installations
If a passage reader that has been performing well
develops performance problems:
• Walk through area to see if there are evident
changes in the physical environment. Has
equipment been moved or new equipment
installed?
• Check with facilities and department personnel
regarding recent repairs. It is possible that
performance is affected by rerouted wiring or
other non-visible changes to existing
equipment.
Intermittent Interference
The following may help identify intermittent
interference:
• Test system performance at different times to
pinpoint the problem to a specific time period.
Check with facilities and department personnel
regarding equipment and processes that occur
during the periods when performance is an
issue.
• Check whether equipment in the vicinity
operates at different intensity at various times. If
so, it may be producing an unacceptable level
of interference only when operating at high
setting.
• Consider whether potential sources of
interference move in and out of the vicinity of
the passage reader. A fork lift may affect
performance only when it passes close to the
passage reader.
Multiple Sources of Interference
In some cases, a passage reader is affected by
more than one source of antenna interference. It
may be necessary to repeat the cycle of
investigation and control for antenna interference
until all sources are identified.
Improve Performance
There are several ways to control the effect of
interference on passage readers. Methods of
control vary depending on the source of
interference.
Control Cable/Line Interference
The following options may help control cable/line
interference:
• Install a UPS (uninterruptible power supply)
battery to filter RF controller power.
• Separate data and door latch relay cable runs
from antenna cable runs by at least 15cm (6in.).
• Call tech support for assistance in
troubleshooting interference related to inputs
and/or outputs.
Control Antenna Loading
Avoidance is the only way to control antenna
loading; either the metal object or the affected
passage reader must be moved.
Control Antenna Interference
There are several ways to control antenna
interference:
• Move reader or source of interference
• Install cancellation coils
• Consult your technical support representative.
Relocate the reader or the source of interference
so that system performance is no longer affected.
This is the most permanent solution.
In some cases, modifying the orientation of the
source of interference can improve system
performance—try changing the vertical/horizontal
orientation or rotating it. Experiment with several
positions to determine impact on passage reader
performance.
Cancellation coils are used to control localized,
well-defined sources of antenna interference. The
coils are assembled and connected using standard
18AWG, plenum rated wire. A cancellation coil is
connected to an affected antenna, then attached to
the source of antenna interference.