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| Design of water supply control system based on PLC |
| LIU Yi1, FANG Gui-sun1, LI Chen-chen1, LIU Jing-wei2 |
| 1.School of Fluid Power and Control Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2.The First Primary School of Chengguan Town in Fugou County, Fugou, Henan 461300, China |
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Abstract The automatic water supply system with speed adjusted by PLC and VVVF(Variable Voltage and Variable Frequency) was introduced.PLC was used to process the logical and PID control,and VVVF was used to adjust the feed water pump speed.For this water supply system under constant pressure it is designed a suit of PLC controlling system based on variable frequency speed regulating technology.The system consists of pressure sensors,transducer,pumps,relays,contact device and so on.By comparing the setting value and measuring value of pressures,the deviation is obtained.Then the control volume is obtained by the PID operation to affect the transducer.Thus the pump rotational speed is controlled through transducer to adjust the pressure of the pipe net work and to realize the constant pressure water supply goal.The constant feed water pressure with highly automatic operation could be provided.The control system was energy-saving with steady work conditions.pump station;PLC;water supplying;variable-frequency speed regulation;energy saving
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Received: 08 August 2013
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