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APV_CU4 AS-i_UK-5_072018.indd
UK
Control Unit
CU4 AS-interface
Instruction manual: UK - rev. 5
APV
7
3. General Terms
3.1.
Purpose of use
The CU4 AS-interface Control Unit was developed for the control of
process valves used in the food and related industries.
The CU4 control unit operates as interface between process control
and process valve and controls the electric and pneumatic signals.
The pneumatic control of valves is undertaken via the solenoid
valves. The control unit controls the valve positions,
open
and
closed
, via integrated and external sensors. The electronic module
undertakes the task to process the switching signal from the control
and to control the corresponding solenoid valves. The electronic
module also provides potential-free contacts.
The corresponding light signals in the control unit provide for an
external indiciation of the valve positions.
3.2.
Design of CU4 AS-interface (fig. 3.2.)
The CU4 AS-interface control unit mainly consists of the following
components:
1.
The control unit base with integrated air channels and electric and
pneumatic connections as well as viewing windows with type label.
2.
1 or 3 solenoid valves for the control of the valve actuators and for
the seat lifting of double seat valves.
1 solenoid valve with 1 logic NOT element for the control of the
valve actuators.
3.
Sensor module with 2 integrated Hall sensors or 2 external
proximity switches to detect the valve position.
4.
The electronic module for the electric supply, communication with
control, evaluation of feedback signals and control of solenoid
valves as well as valve position indication through LED.
5.
Clamp ring to fasten the CU4 on the adapter.
6.
Cover with LED optics.
The cable/s by means of which the solenoid valves are connected
with the electronic module must be guided through the cable guide
at the rear side of the electronic module (fig. 3.2.1).
cable guide
fig. 3.2.
fig. 3.2.1
3.
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