Festo VABF-S4-1-V2B1 series Operating Instructions Manual page 46

VABF-S4-1-V2B1...
Fig. 4 illustrates the operating mode 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 switching
status displays of the solenoid valve are shown at the bottom of the diagram.
Vacuum
0
Excess pressure
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"
Fig. 4 Operating mode of the air-saving function
Vacuum generation is switched off when the vacuum is higher than threshold 1 and is switched on
again when the vacuum is less than threshold 2.
46
Hysteresis
3
Switching point channel B "vacuum query"
4
Ejector pulse
Festo – VABF-S4-1-V2B1...-D2 – 1212a English
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