CLA-VAL CPC 138-01, Technical Documentation Manual, Page: 9 / 42

CLA-VAL
CPC
Actuated Position Control 4-20 mA
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CLA-VAL
Europe
www.cla-val.ch cla-val@cla-val.ch 5 - LIN040DE A 02/10
© Copyright CLA-VAL Europe - Specifications subject to change without notice - no contractual illustrations.
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4 Typical applications for the SERIES CLA-VAL CPC
Remote Set Point
The CPC actuator receives an analogical signal (4-20 mA) from a
SCADA system and automatically adjusts the «brushless» motor
until the valves position reaches the prescribed set point.
The CPC actuator is particularly recommended for applications
where the user wishes to keep a hydraulically operated system with
the ability to change the set-point of the valve. Applications are
numerous depending on the types of the parameters chosen.
Local Set Point
The CPC Actuator working together with an e-Smart/L2 electronic
controller provides automatic control of the system. E-Smart/L2
compares local feed-back signal with pre-programmed conditional
set-points and adjusts the valves position automatically until set-point
is reached.
Hydraulic Safety
In most CPC Actuator applications, it is possible to secure its
operation during electrical power failure by additional hydraulically
operated CLA-VAL pilot(s) which are added to its pilot circuit. These
allow the valve to maintain a safety value. E.g Pressure reducing,
pressure sustaining or maximum rate of flow until power is restored.
The above combination offers the advantage of not only controlling
the valve in the event of electrical power failure, but to increase the
flexibility of the CPC Actuator application, by adding to the basic
operation other hydraulically operated functions. These additional
features for the SERIES CLA-VAL CPC are highly appreciated in
applications where other variables have to be regulated during power
failure.
Autonomous Turbine
A particular feature of the CPC Actuator is its very low power
consumption with a voltage of 24 VDC. CLA-VAL has therefore taken
advantage of this and developed an autonomous turbine
hydraulically installed as bypass of the CPC Actuator operated valve.
The turbine can feed the CPC Actuator electrical motor and
eventually any other low power users, as transmission of data or
specific information.
The autonomous turbine, is mounted in bypass of the valve, is
producing 0,5 A at 24 VDC and works in parallel with a battery,
permitting actuation of the CPC motor.
Remote set point
Feedback
loop
e-Smart/L2
Local set point
Hydraulic
safety
Autonomous
turbine