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1、河北建筑工程学院毕业设计（论文）外文资料翻译毕业设计（论文）外文资料翻译系别：系别： 电气系 专业：专业： 电气工程及其自动化 班级：班级： 电控 071 姓名：姓名： 贾旭 学号：学号： 2007308112 外外文文出出处处： http:/ 附附 件件：1 1、外外文文原原文文 ；2 2、外外文文资资料料翻翻译译译译文文。指导教师评语：签字： 年 月 日1 1、 外文原文外文原文Drive in Water Supply System Abstract: This design uses “more than a water pump converter control,“ the mul
2、ti-pump control system. Here the use PLC to design a frequency control water supply system, which the network can automatically adjust the instantaneous pressure changes the speed of a water pump and pump more than one input and exit, so that the outlet pipe network backbone to keep in constant the
3、set pressure value, and meet the users flow requirements, so that the whole system is always best to keep energy efficient. Constant pressure variable can be realized, two other control variables constant, a variety of start-stop control mode, the system can modify the parameters of any command (suc
4、h as the pressure setting, the control order, control the motor number, the pressure on the lower limit, PID values, acceleration and deceleration time); has a complete electrical safety protection measures, overcurrent, overvoltage, undervoltage, overload, without water and so can self-diagnosis an
5、d fault alarm. To ensure normal water supply area, the use of PLC control frequency control water supply system, according to the needs of users on-demand water pump flow adjustment, according to less water at night can only open a small flow pump, and to meet traffic demands of users, so true alway
6、s maintain a system of energy-efficient best. Keywords: Inverter Water Supply PLC Body: With the rapid social and economic development, urban construction expanding the size of the population increase and rising living standards of urban water supply quantity, quality, stability, higher and higher r
7、equirements. Small and medium cities in China, especially the old water plant water plant automatic control system configuration is relatively backward, the control unit depends on duty personnel manual. Control process cumbersome, but can not manually control the pressure of the water supply networ
8、k and water level changes in a timely manner to respond appropriately. To ensure the water supply, often in over-pressure condition unit running, not only low efficiency, power consumption, and a long period of Chengshiguanwang overpressure running, exposure is also very serious loss 7, constant pre
9、ssure water supply systems are becoming increasingly popular . 1. Characteristics of Water Supply Water Supply refers to the amount of water regardless of the size of the user segment, the total almost constant pressure to maintain the network, so that each part can meet the demand for water users,
10、not the motor idling, resulting in energy waste. (1) energy efficient As a result of constant pressure variable, the variable transformer supply system, water pump station number and speed of opening is automatically adjusted according to water the size of their own, but also with a small pump to pu
11、mp a large water peak at night to stop working automatically, so that the small pump automatically put into operation maintain the pipe network pressure, so energy efficiency, energy saving than the conventional 20% -45% water. Heat flow, short circuit protection, soft start pump motor from the powe
12、r, no inrush current. As a result of computer control, equipment, automatic operation without duty. (2) operation management is simple, high degree of automation A low water level or pump function automatically stops, using high-quality frequency control devices, overvoltage, over voltage, under vol
13、tage, overload, over current protection 2. Frequency Water Supply describes the adjustment process technology Switching the start of pump, if the hardware, software, were no spare (both hardware priority is valid), 1 # start the pump frequency, the frequency increased with speed from the beginning,
14、such as the inverter frequency to arrive at a time when pressure is still lower limit, delay time (time relay from the internal control is to avoid the interference caused by malfunction), the 1 # to switch to the pump frequency operation, while the frequency converter to the sliding stop, 2 # pump
15、frequency conversion such as the water pressure is still not satisfied, then in turn start the 3 #, 4 # pump; if the standby pump start # 1, Kai 2 # frequency directly, the speed increased from 0 with frequency, such as the inverter frequency to reach, at which point the water pressure is still lower limit, delay time, 2 # run the pump switch to the frequency, while the frequency converter to the sliding stop, 3 # pump frequency conversion, such as the water pressure is still not satisfied, start 4 # pump; if a #, 2 # pumps are standby, the direct conv
