VOFA-L26-T32C-M-G14-1C1-...
Festo – VOFA-L26-T32C-M-G14-1C1-... – 1409NH English
47
7.3
Switch-off characteristics
Fig. 6 shows the pneumatic and electric switch-off characteristics at the control block with PNP proxim-
ity sensors and without resistive load. Through interrogation (resistive load) of the proximity sensor,
the switching times can be extended by a maximum of 2 ms. When using NPN proximity sensors the
signal characteristics are reversed, i. e. dropping instead of rising.
Process during switch-off:
At the time t = 0, voltage to both coils is switched off. After approx. 54 ms the pressure at port (2)
drops to 0 bar and the proximity sensors report that the piston spools of the solenoid valves have
reached the neutral position after a total of approx. 58 ms. Further switching times
chap. 13.
1
2
3
1
Signal voltage at proximity sensor E1
2
Signal voltage at proximity sensor E2
3
Pressure at port (2)
Fig. 6
Diagram with signal sequence when switching off the control block (diagram shows meas-
urements with the PNP proximity sensor at an operating pressure of 6 bar without resistive
load)
Note
The switching times shown above were determined against the ambient pressure
without using a silencer and only apply for an operating pressure of 6 bar. Switching
times for 3 bar and 10 bar
chap. 13.
7.4
Performance test
Requirements:
–
Electrical installation at the control block must have been performed.
–
Pneumatic installation at the control block must have been performed.
