11
INSTALLATION AND OPERATION INSTRUCTIONS — FENCE PROTECTION SYSTEMS
3
THEORY OF OPERATION
Concept
When the Transducer Sensor Cable experiences small mechanical shocks or vibrations, an electrical
signal is generated between the center conductor and the outer shield. The Signal Processor then
analyzes that signal and makes the determination as to whether the vibration is intruder related or
from natural causes such as wind, rain, hail, etc. Should there be an intruder, the signal processor will
generate an alarm output.
The FPS-3 system features the
Magal-Senstar
exclusive EDAPT alarm processing system. The
EDAPT system utilizes a computer modeling program to analyze the fence activity of all alarm zones
and automatically adjust the alarm threshold based on current fence conditions and historical data.
Alarm processing
The
MSI
FPS system is a strain-sensitive cable sensor system, meaning that a mechanical disturbance in
the fence causes a small strain on the sensor cable that is converted to an electrical signal.
The sensor cable is a small coaxial cable specially manufactured with a permanent electrical charge
throughout its entire length. Any movement in the fence causes a small voltage to appear at the
sensor cable output.
Magal-Senstar
tests every foot of the sensor cable to verify that the alarm
sensitivity will be uniform over the entire length.
The sensor cable connects to the FPS-3 dual zone pre-amp mounted on or near the fence at the
beginning of the detection zone. The mechanical disturbance detected by the sensor cable is sent to
the dual zone pre-amp. Each FPS-3 dual zone pre-amp contains two independent zones of perimeter
protection (see Figure 11). The typical FPS-3 dual zone pre-amp will have up to a 1000-foot alarm zone
running in each direction.
1.
The dual zone pre-amp sends the alarm and tamper information to the FPS-3 Central Controller
for processing. All alarm event processing is accomplished at the FPS-3 Central Controller, away
from the harsh outdoor environment of the fence. The Central Controller contains individual
plug-in cards for alarm processing, system diagnostic lamps and a built-in test system that allows
you to test each zone.
2.
The FPS-3 Central Controller forwards alarm event information to the MX-5300 Control Station.
The MX-5300 utilizes advanced EDAPT processing, which uses the alarm data in a unique calcula-
tion to best determine the occurrence of an actual alarm condition over the external physical
forces (wind, rain, etc.) and the aging conditions of the fence installation.
The dual zone pre-amp is capable of monitoring a transducer cable in excess of 1000 feet, depending
on the total capacitance of the cable attached to the sensor input. The graph, Table 1, indicates the
sensor cable capacitance relative to length. The maximum allowable capacitance is 100,000 pf. In
addition to the transducer cable, it is possible to use nonsensitive cable (30MNS) to connect transducer
cable to the processor as long as the maximum capacitance is not exceeded. This is sometimes desir-
able in cases where the processor is not located near the fence.
