FP400 alarm detection
Page 58
FP400 Product Guide
Intruder detection
The FP400 protects against three intrusion attempt scenarios:
•
Cut scenario - An intruder attempts to cut through the fence fabric.
•
Climb scenario 1 (climb-over) - An intruder attempts to climb over the fence.
•
Climb scenario 2 (crawl-under) - An intruder attempts to crawl under the fence by lifting the
fence fabric.
Cut intrusion detection
Cutting the fence fabric produces a high amplitude signal that exceeds the Event Threshold
setting. Each time the Event Threshold is exceeded the Event Count (disturbance event) is
incremented. When a specified number of Events occur within a preset Alarm Window time, the
FP400 processor generates an alarm. If the Event Count is not reached within the Alarm Window
setting, the Event Count and Alarm Window reset to 0.
The processor reports an alarm when:
•
the signal from the sensor cable exceeds the Event Threshold,
•
the number of times that the Event Threshold is exceeded reaches the Event Count setting,
and
•
the Event Count setting is met within the Alarm Window time period.
Climb intrusion detection
When an intruder attempts to climb over the fence, a large number of energy pulses rapidly occur.
Lifting the fabric to crawl under the fence has a similar effect. Climbing onto the fence causes the
signal from the sensor cable to exceed the Event Threshold setting, which increments the Event
Count. The initial contact also activates the Event Duration counter. Each time the detection signal
rises above the Event Threshold, the Event Count increments and the Event Duration
accumulates the time the signal remains above the Threshold. If the Event Count is reached or the
Event Duration time is exceeded within the Alarm Window time, the system generates an alarm. If
the Alarm Window time lapses before the Event Count is reached or the Event Duration time is
exceeded, the Event count, the Event Duration, and the Alarm Window all reset to 0.
The processor reports an alarm when:
•
the signal from the sensor cable exceeds the Event Threshold,
•
the Event Threshold is exceeded for the Event Duration time,
OR
the number of times that the Event Threshold is exceeded reaches the Event Count setting
and
•
the Event Duration time is accumulated within the Alarm Window time setting,
OR
the Event Count setting is met within the Alarm Window time setting.