©
CIAS Elettronica S.r.l.
Ed. 2.4
i. Release the vertical movement of the transmitter and carry out the operations described for
the vertical alignment of the receiver, blocking the transmission by hand instead of pressing
push button S1. At the end of this operation lock the vertical movement of both transmitter
and receiver.
j. Rotate switch SW1 to Position 2, ensuring that during this operation there are no obstacles
or alterations within the microwave field, for example the operator standing in the field. This
is very important because during this phase the barrier acquires the modulation channel
value and the field signal value and any changes in the field can lead to acquisition of
incorrect values. The acquisition of these values by the receiver takes a few seconds after
the push button S1 is pressed. After about 3 seconds the buzzer BZ1 emits a certain
number of sounds indicating the alignment quality or more precisely:
1 Beep =
Best Quality
2 Beep =
Good Quality
3 Beep =
Poor Quality
4 Beep =
Insufficient Quality
5 or more Beep =
None.
If the alignment is insufficient or none then all the alignment procedures must be repeated
ensuring that there are no obstacles or interference in the detection field and return to this
phase by pressing push button S1.
3 Rotating the function switch SW1 to position 3 makes it possible to conduct a Walk-Test,
while the barrier works with the parameters set using the sensitivity switch SW5 and the
masking switch SW4, and every variation in the microwave signal in the sensitive zone will
activate the buzzer mounted on the board of the receiver. The buzzer sound is intermittent
the frequency of which is dependent on the intensity of the variation. If the frequency
increases then this signifies that the variation has increased (which indicates a greater
penetration of the detection field) and if the disturbance signal reaches a level that meets
the alarm condition and there is also an alarm on the infrared barrier the buzzer will sound
continuously. In this mode it is possible to evaluate the actual size of the sensitive zone and
find potential sources of interference (for example loose fences or other factors) that can
influence the detection zone in which it is detected. With the function switch SW1 in position
3, press the push button S1, memorising the parameters set by the SENS and MASK
switches and obtaining the sound indication relating to the quality of alignment as described
in “j”. This is particularly useful when making checks for maintenance. If the results of the
walk test do not satisfy the detection requirements for the zone it is possible to adjust the
sensitivity of the PYTHAGORAS, using switch SW5 and pressing push button S1. The
default setting is “7” and represents the best setting for most situations. To increase the
sensitivity set this switch to a higher value, such as: “8”, “9”, “A”, “B”, “C”, “D”, “E”, “F”. And
to decrease the sensitivity set this switch to a lower value, such as: “6”, “5”, “4”, “3”, “2”, “1”,
“0”. It is important to remember that the value is only active after pressing the push button
S1.
Changes in sensitivity made using SW5 and push button S1 will affect the dimensions of the
sensitive field, and an excessive increase in the sensitivity can lead to an increase in false
alarms from the MW barrier while an excessive reduction in the sensitivity can reduce the
detection capability for detecting genuine intrusions.
Installation Manual
Page
46
of
56
PYTHAGORAS
