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3
ALIGNMENT PROCEDURE
The alignment between the emitting and the receiving units is necessary to
obtain the correct operation of the light curtain.
A good alignment prevents outputs 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.
The beam used to synchronize the two units is the closest to the connector.
Thereon we refer to such beam as SYNC and to the last one as LAST.
When SYNC beam is not engaged all other beams scan it’s not possible,
thus it’s mandatory to have SYNC beam aligned and not intercepted.
A LED user Interface provides
indications about optic alignment
together with Fieldbus connection
status.
LEDs are clearly identified through
symbols or labels allowing their
immediate reading, independently of
bars directions; Find below a short description of LEDs indications about optical
alignment. For Fieldbus connection LEDs please refer to cfr.
USER INTERFACE
AND DIAGNOSTICS
.
The standard installation described hereinafter is the one shown in figure with the bar assembled with the connectors
pointing down.
Two yellow LEDs (
LAST,
SYNC) on receiver unit facilitate the alignment procedure.
During standard operation, the LEDs indicate the safety light curtain optical alignment status, as shown in the table.
ALIGNMENT STATUS
LED colour
Symbol
FREE
INTERCEPTED
Yellow
OFF
ON
ON
OFF
Yellow
OFF
ON
OFF
OFF
Red/Green
GREEN
RED
RED
RED
SYNC ad LAST
beam engaged
No intercepted
Beams
UNITS not
aligned
SYNC engaged
LAST not
aligned
Units correctly
aligned but at
least one
intermediate
beam
intercepted
CORRECT alignment procedure
The light curtain alignment can be effected only after having completed the mechanical installation and the electrical
connections as described above.
Compare alignment results with those given in the following table:
Check the green LED ( ) and the yellow LED (
) on the TX unit. If both ON, the emitter is running correctly;
Verify that the sensitive area from the safety light curtain is free;
Verify that one of the following conditions is present on the RX unit:
1. FREE
Alignment LED (
) lit GREEN.
Both yellow LEDs (
,
) OFF.
Units are aligned.
2. INTERCEPTED
Alignment LED (
) lit RED.
The status of both yellow LEDs (
,
) does not matter.
Units are not aligned.