Installation, use and maintenance manual
37
Especially when the ID2202 is set to high sensitivity, it could be useful, anyway, to act on the adjusting
potentiometer, for instance in the occurrence of false detection, or when, in the absence of the bar, the
red LED flashes to indicate that the signal level is near the threshold value.
The ideal condition, in fact, will be that:
in the absence of material, the green LED is off, the red LED not flashing (which, anyway, would
indicate that the sensor detects a light level that is near the detection threshold)
in the presence of material, the green LED is on, the red LED not flashing (which, anyway, would
indicate that the IR signal is low and near the detection threshold).
In the first case (flashing in the absence of material) we recommend reducing sensitivity, while in the
second case it would be better to increase it.
LED flashing can be useful to determine the low limit of sensitivity and to define a safety margin.
in the presence of material, when rolling a “cold” material of small size, reduce sensitivity until the
LED starts flashing slowly, which means that a detection threshold is approaching.
From this position increase again sensitivity until the LED stops flashing, then turn slightly the
potentiometer so as to get a reasonable margin of detection.
Please remember that the HEALTHY output is disabled when the amount of IR signal is near the
threshold, that is when the LED lamp starts flashing. If this output is wired at a PLC output, it can be
used to check when the threshold is approaching, what affects reliability of detection negatively
(incorrect detection or loss of detection).
Danieli Automation Standard - Installation Use and Maintenance Manual - ID2202
Certified by OneDoc A.620.107 Rev.04-MU 38/145 #1061394
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