Product Description
EN-US · 30.30.01.02237 · 00 · 04/20
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3.3.1 Ejector Variants
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) version, the venturi nozzle is activated.
•
In the IMP variant, the venturi nozzle is actuated using the same principle as the NC variant. This
means that pulse control via the suction command is not necessary. Transmission in pulses is carried
out internally in the ejector depending on the requested Suction command.
Power Failure or Communication Interruption with the Ejector Variant IMP
In the ejector variant IMP, the ejector remains in “Suction” mode if the power supply fails during auto-
matic mode. This prevents the object being gripped from falling from the suction cup in the event of a
power failure (or failure of the controller or its communication). This also applies when the ejector was in
the “Venturi nozzle inactive” state with the air-saving function activated. In this case, the ejector switches
to “Venturi nozzle active,” i.e., to continuous suction. When the power supply actuator returns, the ejec-
tor remains in automatic mode with the air-saving function activated.
If the pulse ejector is in the “Suction” operating state when the terminal is restarted or communication is
re-established (after a communication interruption with the controller), it can only be reset to the “No
suction” operating state either by a falling edge of the suction command (option 1) or by a rising edge of
the blow-off command (option 2).
Option 1:
SUCTION = OFF after a communication interruption or restart of the SCTSi via falling edge at
bit: Ejector suction
True
false
True
false
ON
OFF
ON
OFF
EJECTOR CONTROL
/ Bit: Ejector suction
EJECTOR CONTROL
/ Bit: Ejector blow-off
“Suction” state
“Blow-off” state
ETH communication failure or supply
voltage failure of the sensor voltage SCTSi
