Operating status
LED 12
1)
LED 14
2)
Explanation
Pressurise (ejector pulse)
Off
Illuminated
Vacuum accelerates disas-
sembly
Normal position
3)
Off
Off
Status after the end of the
"Drop" signal
1) Vacuum generation
2) Ejector pulse
3) normal position means that the vacuum generator is not in the "Generate vacuum", "Air saving" or "Ejection" operating status.
Tab. 11 Operating statuses of the vacuum generator
If the pilot air supply or the electrical supply of the vacuum block is switched off, the respective oper-
ating status is changed as follows:
Change of state
Operating status before change
of state
Operating status after change
of state
"Generate vacuum"
"Generate vacuum"
"Air saving"
"Generate vacuum"
"Pressurise"
"Normal position"
1)
Failure/deactivation of the elec-
tronics supply or the pilot air
supply of the vacuum generator
Normal position
1)
"Normal position"
1)
"Generate vacuum"
"Generate vacuum"
"Air saving"
"Air saving" (vacuum is main-
tained)
"Pressurise"
Function is interrupted
2)
Emergency stop/switch-off of
the load voltage supply
"Normal position"
1)
"Normal position"
1)
1) normal position means that the vacuum generator is not in the "Generate vacuum", "Air saving" or "Ejection" operating status.
2) Parameter "Interlock ejector pulse" must be active.
Tab. 12 Pneumatic and electrical state changes
4.13
Emergency-stop function
If the emergency stop (switching off the load voltage supply) is triggered during vacuum generation,
the vacuum generator remains in the vacuum generation. If the air saving function was activated, it
remains active. If the parameter "Ejector pulse locked"is activated (set to inactive at the factory), no
ejector pulse is triggered in the event of an emergency stop.
If there is a complete failure of the electrical energy (electronic supply voltage) during vacuum genera-
tion, the valve switches to the switching position "Generate vacuum".
When the power supply is switched on again, the valve remains in the "Generate vacuum" operating
status until a discharge signal is received.
4.14
Error state
If communication between the controller and the vacuum generator is interrupted, a defined status is
set. The following settings are defined in this error status state:
–
Output bit "Vacuum generation" is set to 0.
Function
17
Festo — VABF-S4-...-CB-VH/VL-... — 2019-05
