pedal FS2-528-ZSD4-U use safety switches. The left foot actuator have two
positions (free position and pressed down position), it can be used , for
example, to drive the dangerous movement back (for instance get up of a
press brake tool etc…). The right foot actuator have 3 positions, with
a hard point, to control dangerous movements (for instance get down of a
press brake ect…).
It has 4 working contacts ( 2NC+2NO) to drive the
movement and a block of 2 safety switches (1 positively driven NC contact
+ 1NO) to stop the movement. Pressing on the right foot actuator, till the
hard point, allows the changeover of the 4 working contacts.
Once the hard
point is got over, the 4 working contacts return to their first position
and the 2 contacts block is activated in order to stop immediately the dangerous
movement. Then it would be possible to drive one more time the movement
after the right foot actuator is completely loosed. This function allows
to stop immediately the machine even if the operator is carried along in
front by the dangerous movement.