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  •   Ammattikorkeakoulut
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Automated washing and level controlling of a tank system

Amuzu, Kossi (2012)

 
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Amuzu, Kossi
Vaasan ammattikorkeakoulu
2012
All rights reserved
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-201205208895
Tiivistelmä
The main purpose of this project was to control the level of water in a production tank automatically by using a PID controller together with solenoid valves and water pumps that are controlled by programmable logic controller (PLC).
The control process level is divided into two phases namely the washing and the steady flow production phase.
A programming sequence was designed to control the process with the help of an easy to use graphic user interface known as Supervisory Control and Data Acquit ion (SCADA). The sequences were created with function block with several data blocks with STEP7 software application and linked to the graphic user interface. The sequence gives signals to the actuator, which in turns gives an output respond signal to the component to be controlled.
Proportional Integral Derivative (PID) controller was used to control the speed of the pump and also to measure the level of water in the tank using current and voltage signals. The current and voltage signals are scaled according the programming algorithmic calculations.
Level indications were designed with the programming device to monitor the level of water in tank at each stage of washing and steady flow phases to either high level or low level.
As a result, both tanks were filled to the desired level and controlled with the operator workstation on a centralized computer system. The PLC together with the programming device helps to control and monitor the process at each stage of the production phase.
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