9
In some applications, sensor 3, if correctly positioned, also creates an
additional protective barrier in that if sensor 3 is not engaged correctly,
the control unit causes immediate stopping of the machine (fig. 4).
Figure 4
Positioning of sensor 3 in a typical application.
The muting cycle ends successfully if, once sensor 3 has been freed, all
the elements have switched according to the correct muting sequence.
The configuration of muting sensors 1 and 2 in the case in which
proximity type sensors (capacitive, inductive or photoelectric diffuse
switches) are used is shown in fig. 5 below. To perform the correct muting
sequence, sensors 1 and 2 must be replaced by two pairs of sensors
(1a/1b and 2a/2b).
In this case, the outputs of the single pairs of sensors must still be
connected in parallel.
Figure 5
Use of proximity sensors.
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