IDEC SG4 Type 4 Finger & Hand - Manual (Page 37)

Instruction Manual SG4-B Series
33
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 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 synchronise the two units is the closest one to the
connector. SYNC is the optics connected with this beam and LAST is
the optics connected to the last beam after the SYNC unit.
Fig. 22
Signals are clearly identified through symbols allowing their immediate
reading, independent of bars directions; a short description of LEDs
signals proves nevertheless necessary so as to avoid
misunderstandings.
Receiver Emitter
Fig. 22
last optic (LAST)
first optic = synchronisation optics (SYNC)
LAST
SYNC
NORMAL
OP.
SAFE(BREAK)
NORMAL
OP.
ON