Ronan XSD-1000 - Manual (Page 72)

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Alarms
Radiation Alarm – These alarms are only detected during a Truck Present cycle. If a
radioactive source has been detected in a vehicle during a Truck Present cycle or the
vehicle has blocked the photo-eyes for longer than the Maximum Truck Present Time
(defined in Administrative Options – Alarms Setup – Truck Present Alarms), this alarm
will be activated.
Speed Alarm – This alarm is only detected during a Truck Present cycle. The Photo-Eyes
for Speed Checking (defined in Administrative Options – Configuration – PhotoEyes)
will detect the vehicle’s speed and report any speed violations. A speed violation
requires that the vehicle be re-scanned through the system. Numerous speed violations
could mean that a photo-eye has failed and the system thinks it is blocked, causing
spurious speed violations. Periodically run the System Verification to check for proper
photo-eye operation.
Truck Present Time-Out Alarm – This alarm is only detected during a Truck Present
cycle and triggers a Radiation Alarm. (See Radiation Alarm above). If you receive a
Truck Present Time-Out Alarm and the vehicle had already exited the system, run the
System Verification to check the photo-eye operation. A failed photo-eye can look like a
blocked photo-eye to the system.
Detector Fault Alarm – This alarm is triggered by the counts (value displayed in the
green boxes on the Main Screen for each detector) received by a detector being below the
Detector Low Count Failure value defined in the Administrative Options – Alarms Setup
– Background Alarms menu. The box under this setting is the consecutive number of
times this condition must be met before actually issuing the alarm. This value should
always be 3. The Low Count Failure value is normally set to 1.
High Background Alarm – This alarm can occur only during Background Mode (when no
photo-eyes are blocked). If a large radioactive source is exposed to the detectors, the
instantaneous counts are compared against the background average (displayed during
Background Mode in the green boxes on the Main Screen). If the instantaneous counts
exceed the background average by a factor defined in the High Background Alarm
Multiplier (Administrative Options – Alarms Setup – Background Alarm menu), and it
occurs on consecutive samples (as defined by the High Background Consecutive Failures
till Alarm menu), this alarm will be triggered. If this alarm occurs, the background
averaging will cease until the condition is remedied.
I/O Failure Alarm – These alarms can occur anytime a Remote I/O Module fails to
communicate properly.