SG4E Full Rev01.pdf - Datasensor

ALIGNMENT PROCEDURE
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5 ALIGNMENT PROCEDURE
The alignment between the emitting and the receiving units is necessary to obtain the correct
functioning of the light curtain.
A good alignment prevents output’s instability caused by dust or vibrations.
The alignment is perfect if the optical axes of the first and the last emitting unit's beams
coincide with the optical axes of the corresponding elements of the receiving unit.
Since the light curtain has two beams for the synchronization, let’s call SYNC1 the sync
beam at the bottom, the first beam of the array, and SYNC2 the sync beam on the opposite
part of the light curtain, the last beam of the array.
The figure shows that the first beam is located at the bottom edge of the light curtain, near to
led display. The last beam is at the opposite near the terminator cap. These two beams are
the synchronization beams too.
1st beam
Nth beam
last beam
Fig. 26 – Description of the beams
The Alignment function can be activated by simply keeping pressed the external normally
open push-button linked to RESET/RESTART/ALIGN input (pin 3 of M12-12 poles – RX
side) at start-up until the second led (red) begins to blink indicating the activation of the
Alignment function, as shown in the following timing diagram. When a good state of
alignment is reached a power OFF and a power ON operation carry back the ESPE in
normal operation.
STATE OF LIGHT CURTAIN (POWER)
ON
OFF
RESET/RESTART/ALIGN
24Vdc
0Vdc
BLINKING OF THE RED LED
ON
OFF
STATE OF LIGHT CURTAIN (ALIGNMENT)
ON
OFF
Fig. 27 – Alignment timings
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