5 General Description of Functions
5.1 Picking up the Workpiece (Vacuum Generation)
The ejector is designed for vacuum handling of airtight parts in combination with suction systems. The vacuum is
generated in a nozzle according to the Venturi principle, using suction generated by the flow of accelerated com-
pressed air. Compressed air is channeled into the ejector and flows through the nozzle. A vacuum is generated im-
mediately downstream of the motive nozzle; this causes the air to be sucked through the vacuum connection. The
air and compressed air that have been removed by the suction exit together via the silencer or exhaust air channel.
The “Suction” pilot valve is controlled directly.
•
In the NO (normally open) variant, the venturi nozzle is deactivated when the suction signal is received.
•
In the NC (normally closed) variant, the venturi nozzle is activated when the suction signal is received.
When objects with airtight surfaces are picked up, the integrated non-return valve prevents the vacuum from
dropping.
5.2 Depositing the Workpiece/Part (Blowing Off)
In blow off mode, the vacuum circuit of the ejector is supplied with compressed air. This ensures that the vacuum
drops quickly, allowing the workpiece to be deposited quickly.
The “Blow-off” pilot valve is controlled directly. The ejector switches to blow off mode for as long as the signal is
present.
5.3 Restricted Mode
The “Blow-off” and “Suction” pilot valves have a button for manual operation.
This can be used to actuate the valve manually without a power supply.
ü
The compressed air supply is connected.
4
To activate the valve in question, trigger the man-
ual auxiliary actuation using an implement such as
a ballpoint pen.
“Blow-off” pilot
valve
“Suction” pilot
valve
Manual auxiliary actuation
5.4 Changing the Blow-Off Flow Rate on the Ejector
Do not overwind the stop on the valve screw. A minimum flow rate of approx. 15 % is always neces-
sary for technical reasons. The blow-off volume flow can be set between 15 % and 100 %.
There is a valve screw below the vacuum connection that can be used to adjust the blow-off flow rate. The valve
screw is equipped with a stop on both sides.
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EN-US · 30.30.01.02662 · 00 · 02/21