Fracarro SHIELD C Mode D'emploi page 21

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Anti-masking
The detector is equipped with an active IR anti-masking function to protect the pyroelectric sensors. It emits a tampering signal
within 3 minutes.
The output of this function is the MASK terminal block (see fig. 13).
In a standard configuration, this terminal block can be connected to a 24h active line or to a control unit input appropriately
programmed to send fault messages. When the detector identifies a masking attempt, the four LEDs flash simultaneously until
the masking condition is resolved. To enable the correct operation of the masking detection system (Anti-masking), allow the
detector to study and analyse the environmental conditions of the area to be protected. This procedure is mandatory to guarantee
the correct operation of the anti-masking channel.
Follow the procedure below:
1. Make the connections to the detector terminal box, leaving the dip switch set to OFF.
2. Once powered, close the lid and run all the flow tests required.
3. Open the lid and set dip switch 5 to ON.
4. Close the lid immediately (maximum within 10 seconds).
5. Keep out of reach of detector for about 4 minutes in order that not detected any presence and pay attention that there
are no objects within 1 m.
PIR 2 adjustment
Once the detector has been installed at 120 cm from the
ground, adjust the PIR2 (lower) using the adjustment screw.
Position adjustment related to different lower PIR 2 range.
Fig. 16
Fig. 17
21
Fig. 15
POSIZIONE E / POSITION E
POSIZIONE D / POSITION D