Pepperl+Fuchs AL20 Mode D'emploi page 12

Elevator Light Grid AL20/AL40
Detection display and light grid adjustment aid
Display of the numbers to be shown:
Display „0"
Display „5"
18 Detection display and light grid adjustment aid
The detection display is a function that follows automatically after the self test. This dis-
play remains active for about 10 minutes. This should be ample time to perform the ad-
justment and a function test. After this time, the display goes off. The self test mode can
be used to reach a new display as often as is desired. The display is not visible in normal
mode. This ensures that the installed light grid is as unintrusive as possible in normal
operating mode. In our experience this approach reduces damage and attempts to tam-
per with the system. The meaning of all 7 LEDs during this operating mode will now be
described.
If only one LED is lit, it would be difficult for the user to recognize what position was indi-
cated within the 7-segment display without special measures. For this reason, two stan-
ding LED's remain permanently lit, one on the right and one on the left, to make it easy
for users to orient themselves.
• The middle LED is the detection display. If this LED is lit, an
object is detected, i.e. one or more light beams are interrup-
ted.
For technical reasons related to programming, a beam inter-
ruption is not displayed at the real speed.
19 Premature switching off of the LED display
Normally it does not cause any disturbance for the LED display to remain lit for 10 minu-
tes after it has been activated. The LED display can be turned off immediately by inter-
rupting the top light beam (AL20) or the second beam (AL40) for about 2 seconds. If the
display goes off in the moddile of the test, the beam described above has been interrup-
ted for too long. The top light beam is at a distance of 37 cm from the upper end of the
receiver (on the cable side).
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Display „1" Display „2"
Display „6" Display „7"
Display „3" Display „4"
Display „8" Display „9"