Zaščita črpalke pred suhim tekom z merjenjem toka in programirljivim logičnim krmilnikom

PLOT, ALEN (author), Mušič, Gašper (mentor)

V diplomski nalogi smo se lotili reševanja problema suhega teka črpalk. Problem je rešljiv z raznimi merilniki pretoka, vendar se pojavi težava, ko je montaža tovrstnih merilnikov neprimerna oziroma onemogočena. Tudi v tem primeru je sicer na trgu kar nekaj rešitev, a predstavljajo za uporabnika precej visok strošek. Zato smo se odločili, da poizkusimo najti rešitev kar v okviru programa logičnega krmilnika, ki ga programiramo s programskim orodjem Step 7. V diplomskem delu smo predstavili problem suhega teka črpalke, možne rešitve in tudi trenutno rešitev, ki jo uporabljajo v Cinkarni Celje. Predstavili smo idejo, kako bi bilo možno problem rešiti s programskim orodjem Step 7, ter jo v nadaljevanju tudi realizirali. Poleg samega postopka izdelave projekta smo opisali tudi vso uporabljeno ter predstavili delovanje programa. Na koncu smo opisali tudi testiranje programa ter podali rezultate in ugotovitve po zaključenem projektu.

• Language: Slovenian
• Keywords: Suhi tek, črpalka, Step 7, WinCC Flexible
• Work type: Bachelor thesis/paper
• Organization: FE - Faculty of Electrical Engineering
• Year: 2014
• PID: 20.500.12556/RUL-30056
• Publication date in RUL: 09.12.2014

Secondary language

• Language: English
• Title: Pump dry-run protection with current measurement and programmable logic controller

Abstract

Our diploma thesis deals with solving the problem of dry running of pumps. The problem is solvable by using variuos flowmeters, but the problem arises when the installation of such flowmeters is unsuitable or even impossible. There are also, several solutions available on the market, but they come at a high cost to the end-user. Therefore, we decided to find a solution within the framework of the logic controller program, which is programmed with the Step 7 software tool. In the thesis we have illustrated the problem of dry running of pumps, as well as the possible solutions, including the current solution applied at Cinkarna Celje. We have presented and later realized the idea of solving the problem by using the Step 7 software tool. Beside the project engineering procedure we have also described all the applied equipment and presented the software performance. Finally we have described the software testing and presented the results and findings upon the conclusion of the project.

• Keywords: Dry run, pump, Step 7, WinCC Flexible