Table of Contents
Advertisement
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 compressed air. Compressed air is channeled into the ejector and flows through the nozzle.
A vacuum is generated immediately 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 venturi nozzle on the ejector is activated and deactivated using the suction command:
•
In the NO (normally open) variant, the venturi nozzle is deactivated when the suction signal is re-
ceived.
•
In the NC (normally closed) variant, the venturi nozzle is activated when the suction signal is re-
ceived.
An integrated sensor records the vacuum generated by the venturi nozzle. This is evaluated by an elec-
tronics system and serves as the basis for displaying the system states and switching the output. The vac-
uum level is shown in the bar display.
The ejector has an integrated air saving function and automatically regulates the vacuum in suction
mode:
•
The electronics switch off the venturi nozzle as soon as the set vacuum limit value H1 is reached.
•
When objects with airtight surfaces are picked up, the integrated non-return valve prevents the vac-
uum from dropping.
•
If the system vacuum drops below the limit value H1-h1 due to leakages, the venturi nozzle is
switched back on.
If small volumes are to be evacuated, the set switching point H1 may be exceeded considerably
before the vacuum is switched off. This system behavior does not constitute an error.
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.
"Blow off" mode can be controlled externally or internally.
•
When controlled externally, blow off mode is activated by the "blow off" signal input.
•
During internally controlled automatic blow off, the "blow off" valve is activated for a defined pe-
riod after "suction" mode is exited.
The ejector also has a manual mode. In this mode, the ejector can be controlled using the but-
tons on the ejector's foil keypad. See the "Manual mode" section for more details.
5.3 Operating Modes
If the ejector is connected to the supply voltage, it is in automatic mode and ready for operation. This is
the normal operating mode, in which the ejector is operated by the system controller.
In addition to automatic operation, you can also use the keys on the ejector to change the operating state
and switch to manual mode.
The ejector is always parameterized in automatic mode.
5.3.1 Operation and Settings
The three keys on the foil keypad are used for operation and setting the parameters. If no parameters are
set, the ejector is in display mode. The current vacuum is displayed.
EN-US · 30.30.01.02636 · 00 · 01/21
General Description of Functions
15 / 40
Advertisement
Table of Contents
