schmersal SLC 410 B Instructions De Montage Et De Raccordement page 66

MECHANICAL ASSEMBLY AND OPTICAL ALIGNMENT
The Emitter and the Receiver must be assembled opposite each other (at a distance
specified in the technical data sheet). Use the fastening brackets and inserts supplied with
the system to place the Emitter and the Receiver so that these are aligned and parallel to
each other and with the connectors facing the same way.
Depending on the dimensions and the shape of the support on which they are to be installed,
the Emitter and Receiver must be assembled with the fastening inserts at the back, or else
by fitting these in the side groove (Figure 27).
Perfect alignment of the Emitter and Receiver is essential in order to assure correct light
curtain operation. The indicator LEDs on the Emitter and Receiver facilitate this operation.
During these operations it may be useful to check the presence of the weak signal "d"
letter on the Receiver display. Upon completion of alignment, this LED must be off.
In the case of MASTER/SLAVE models, first of all align the SLAVE pair and then the
MASTER pair.
If the Emitter and the Receiver are assembled in areas that are subject to strong
vibrations, the use of vibration-damping supports is necessary, in order to prevent
circuit malfunctions (VA 15-6, code 1161159 / VA 210/410-2, code 1182513 or VA
210/410-3, code 1182515).
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Position the optical axis of the first and last beam of the Emitter on the same
axis as that of the corresponding beams on the Receiver.
Move the Emitter in order to find the area within which the green LED on the
Receiver stays on, then position the first beam of the Emitter (the one close to
the indicator LEDs) in the centre of this area.
Using this beam as a pivot, effect small sideways movements of the opposite
end to move to the protected area clear condition. The green LED on the
Receiver will indicate this condition.
Lock the Emitter and Receiver in place.
Figure 27