VABF-S4-1-V2B1...
12
Festo – VABF-S4-1-V2B1... – 1705c English
Fig. 4 illustrates the mode of operation of the air-saving circuit. The pressure curve together with the
threshold values and thresholds is illustrated in the upper part of the diagram. The corresponding con
trol input signals of the valve terminal, the output signals of the pressure sensor and the LED signal
status displays of the solenoid valve are shown at the bottom of the diagram.
Hysteresis
Vacuum
0
Excess pressure
1
2
3
4
Valve terminal
inputs
LED display
on valve
Pressure
sensor outputs
1
Threshold value channel A “switch off
suction” (air-saving function)
2
Threshold value channel A “switch on suction”
3
Switching point channel B “vacuum sensing”
4
Ejector pulse
Fig. 4
Mode of operation of the air-saving function
Vacuum generation is switched off as soon as the vacuum is higher than threshold
1
and is switched
on again as soon as the vacuum is less than threshold
2
.
