APV_CU4plus_AS-interface_UK-3_062019.indd
UK
Control Unit
CU4plus AS-interface
Instruction Manual UK-3
APV
11
3. General Terms
3.3.
Function of the individual components
The installation of the control unit is undertaken by special
adapters which are available for the different valves types,
see
chapter 5
. Adapter. The snap connectors for supply air and
pneumatic air to the individual cylinders at the valves are located
at the outside of the control unit. At the control units for valves
with turning actuator, the pneumatic air is transferred internally to
the actuator. The air supply of the control unit is equipped with an
exchangeable air filter. Observance of the required compressed air
quality is imperative. Please also see
chapter 4.5
Technical Data.
The number of the solenoid valves installed in the CU4 depends
on the valve actuators to be controlled. Single seat and butterfly
valves and double seat valves without seat lift function require 1
solenoid valve.
Control units for double seat valves equipped with 3 solenoid
valves. For the manual actuation, the solenoid valves are provided
with a safe handle which is easy to operate.
The electronic module installed in the control unit fulfils the task
to process the electric signals from the control, to control the
solenoid valves and to evaluate the feedback signals from the
feedback unit. Moreover, the signalling and indication of the valve
positions as well as additional diagnostic functions are undertaken
via the electronic module.
The electronic module is the interface between control actuators or
sensors. Commnication is undertaken via the standard AS-interface
bus protocol according to specification V3.0.
Valve position detection is realized via a linear sensor which is
integrated in the sensor module.
Control is effected via the solenoid switch cam mounted to the valve
actuator rod. The measuring range of the linear sensor detects
the complete valve stroke. By means of the teach-in function,
the corresponding position for closed and open valve position
are detected and seat lift positions are permanently saved in the
electronic module if required. (see
chapter 7.3
Teach-in function)
For DA3+ double seat valves with active seat lift detection (SLD)
additionally to the linear sensor integrated in the CU, two external
proximity switches installed at the valve actuator are required.
The corresponding signals of the linear sensor as well as external
proximity switches are evaluated in an internal logic circuit and,
thus, the corresponding valve position indications are generated.
(see
chapter 6.7.
Data signals, AS-i communication)
For the D4 valve generation, additionally to the linear sensor
integrated in the control unit, 1 or 2 internal hall sensors are
installed at the CU4 feedback tower.
