Eureka! Institutional Repository

Nowadays cities population continually increases. This leads into a big production of sewage which the sewer companies must handle. Is their responsibility to collect sewage and transport them to wastewater treatment plants. For this purpose, they place sewage pumping plants into the cities, where the sewage ends up. These plants use special pumps to send sewage to wastewater treatment plants. Main characteristic of sewage pumping plants is that they must work 24/7 all year. In case they fail, they overflow, which can be very dangerous for public health (especially in tourist attractions). Another characteristic is that due to their big number they need a lot of employees to watch their operation. It is therefore a one-way street the reliable automation of these plants. This Paper presents the automation of a sewage pumping plant (with 3 pumps) with a programmable logic controller PLC, taking into account all the special features of such a pumping plant. The automation includes the software development of the PLC, taking into account all the necessarily electrical signals and the software development of Supervisory Control and Data Acquisition System (SCADA) for full remote operation of the sewage pumping plant.