VABF-S4-1-V2B1...
Festo – VABF-S4-1-V2B1... – 1705c English
9
1.4
Electrical and pneumatic status changes
Status change
Operating status before status
change
Operating status after status
change
Failure/switch-off of the
electrical supply of the
vacuum block
(M12 connection)
“Generate vacuum”
“Generate vacuum”
(The valve slide remains in
“Generate vacuum” position)
“Air saving”
“Generate vacuum”
(Through the mechanical spring,
the valve slide goes into the
“Generate vacuum” position)
“Ejection”
“Normal position”
1)
“Normal position”
1)
“Normal position”
1)
Failure/switch off of the
pilot air supply
“Generate vacuum”
“Generate vacuum”
“Air saving”
“Generate vacuum”
“Ejection”
“Normal position”
1)
“Normal position”
1)
“Normal position”
1)
1)
Normal position means the vacuum block is
not
in the “Generate vacuum”, “Air saving” or “Ejection” operating status.
Tab. 2
Pneumatic and electrical status changes
Note
If there is a failure of the air or electrical supply of the valve terminal, the following
statuses result.
Air failure:
–
No vacuum can be generated, even if the valve is in the “Generate vacuum” posi
tion.
–
No ejection impulse can be generated, even if the valve is in the “Ejection” posi
tion.
Failure of the valve terminal electrical supply:
–
The switching position of the valve can only be changed through the electronics
of the vacuum block (change between “Generate vacuum” and “Air saving”).
