DT7 ATEND - Installation
23
INSTALLATION
!Install inside the frame and mount it at the top center of the frame (see figure), with the lens facing down.
!Secure the sensor base with two plugs, or use the double-sided adhesive strip supplied.
!Make connections to the control unit, as shown in the figure.
!Insert the supplied screw caps.
!Close the lid and tighten the screws that secure the lid fastening.
!Also avoid the installation between the shutter and the internal frame.
Terminal Mcan be connected to the + INT of the burglar-alarm control unit if you want to activate the alarm
memory function, otherwise it must be left unconnected.
ATTENTION: Do not touch the pyroelectric sensor with your fingers!
DT7 ATEND - Operating
OPERATING
!
!
The detector works in "dual technology"; this means that only if both technologies are alarmed (typical
AND operation) is a real intrusion detected and the alarm is given with the opening of the NC contacts.
This allows you to discriminate false alarms due to the activation of the infrared sensor only (sometimes
caused, for example, by the sun's rays) or of the microwave sensor only.
To increase immunity to disturbances, the pulse counter function has been added to the
detector which, once added up to a maximum of 4 activations of both technologies, with a
pause between one event and the next of less than 15 seconds.
!POWER ON
By applying the power supply voltage, the RED LED flashes for 30 seconds, during the stabilization
phase of the circuit.
!IR SECTION
At each signal from the IR SECTION the YELLOW LED lights up.
!MICROWAVE SECTION
At each signal of the MICROWAVE SECTION the GREEN LED lights up.
NOTE: By turning the trimmer it is possible to adjust the sensitivity for both technologies.
"AND" OPERATION
An intrusion is signaled only if both the infrared sensor and the microwave sensor are activated. (the red
LED lights up and the NC contact opens).
"AND with automatic OR" OPERATION
By activating this function (SW3 = ON), the detector signals the alarm when both technologies are
simultaneously alarmed or when only one of the sensors repeatedly detects movements within about
30 seconds (with the other sensor not alarmed).
This feature prevents the sensor from being disabled by masking only one of the two motion detection
technologies.
SW3=OFF (OnlyAND)
SW3=ON (OR automatic)
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