Datalogic SG4 FIELDBUS Series, Инструкция по эксплуатации, Страница: 40 / 136

ALIGNMENT PROCEDURE
30 SG4 EXTENDED
The Alignment function can be activated by simply keeping pressed the external nor-
mally 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 take the ESPE back to nor-
mal operation.
In Alignment Mode ESPE is always in Safe State and the OSSDs are kept OFF.
The state of alignment is estimated from RX unit by reading the received signal level of
each beam compared on 4 factory established thresholds. First and last beams received
level get some more weight.
In alignment mode user interface informs the user about quality and level of alignment:
Keep the receiver in a steady position and set the emitter until the yellow SYNC1 LED is
OFF. This condition shows the effective alignment of the first synchronisation beam
Rotate the emitter, pivoting on the lower optics axis, until the yellow SYNC2 LED is OFF
Delimit the area in which alignment is good and steady through some micro adjust-
ments - for the first and then for the second unit - in order to have the maximum align-
ment LEVEL ( ) and then place both units in the center of this area.
Fix the two units firmly using brackets. Verify that the LEVEL on the RX unit is as high as
possible and beams are not interrupted, then verify that all LEVEL Led turn OFF if even
one single beam is interrupted. This verification shall be made with the special cylindri-
cal “Test Piece” having a size suitable to the resolution of the device used (see "
Controls
after first installation" on page 18
).
Switch-off and on the device in standard operating mode. The alignment level is moni-
tored also during the device normal operation with the same display (see "
User inter-
face" on page 76 ). Once the light curtain has been aligned and correctly fastened, the
signal display is useful both to check the alignment and show a change in the environ-
mental conditions (occurrence of dust, light disturbance and so on) via signal level mon-
itoring.