Festo Рабочие компоненты для VTIA, ISO 15407-2 - Handbuch (Seite 46)

VABF-S4-1-V2B1…
46 Festo – VABF-S4-1-V2B1…-D2 – 1212a English
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.
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 query”
4 Ejector pulse
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.