Safety
A: PL120100.020
B: PL120100.020
E: 03.93 / T. Weiß
G: 06.93 / T. Weiß
Chapter: 2
Page: 6
Bild: Pl-0002.TIF
Protective guard monitoring device
This device monitors the correct functioning of the following
elements:
a) Alternating operation of position switches (S 24, S 25)
b) Limit switch of hydraulic access protection (S 34).
c) Guided auxiliary contactors (K 288, K 289) in the valve
circuits of the closing unit.
If an error is identified in the above elements, an error message
“Protective guard” is visualized on the display.
2.5 Hydraulic access protection
If the protective guard is open, a mechanically actuated
distributing valve will prevent any movement of the machine.
If the distributing valve is actuated, the entire oil flow is
interrupted, and the contents of the cylinders are emptied into
the tank. The position of the valve is monitored by means of
a limit switch that is activated when the protecting guard is
opened. Moreover, this limit switch also interrupts all electric
output signals.
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