Description Of Functions; Applying Suction To The Workpiece/Part (Vacuum Generation); Depositing The Workpiece/Part (Blowing Off) - Schmalz SCPMc Operating Instructions Manual

6 Description of Functions
6.1 Applying Suction to the Workpiece/Part (Vacuum Generation)
The ejector is designed for handling and holding workpieces by means of a vacuum 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.
The venturi nozzle on the ejector is activated and deactivated using the suction command:
• In the NO (normally open) version, the venturi nozzle is deactivated when
the suction signal is received.
• In the NC (normally closed) version, the venturi nozzle is activated when the
suction signal is received.
An integrated sensor records the vacuum generated by the venturi nozzle. The exact vacuum value is
shown on the display.
The diagram below shows the vacuum curve for when the air saving function is activated:
Vacuum
[mbar]
SP1
RP1
SP2
RP2
The ejector has an integrated air saving function and automatically regulates the vacuum in suction
mode:
• The electronics switch the Venturi nozzle off as soon as the vacuum limit
value set for switching point SP1 is reached.
• When objects with airtight surfaces are picked up, the integrated non-re-
turn valve prevents the vacuum from dropping.
• If leakages cause the system vacuum to drop below the limit value config-
ured for the switching point rP1, the venturi nozzle is switched back on.
• The OUT output is set once a workpiece is picked up securely, based on the
vacuum value. This enables the further handling process.
6.2 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/part to be deposited quickly.
EN-US · 30.30.01.01963 · 04 · 06/23
OUT=on
Vacuum on

6 Description of Functions

OUT=off
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