变频调速控制柜的设计 毕业设计.doc

******************* 毕业设计 专业 年级 学号 姓名 题 目 变频调速控制柜的设计 指导老师： 摘 要 本次设计采用“一台变频器控制多台水泵”的多泵控制系统。在这里利用PLC设计一套变频调速恒压供水系统，该系统可根据管网瞬间压力变化自动调节某台水泵的转速和多台水泵的投入及退出，使管网主干管出口端保持在恒定的设定压力值，并满足用户的流量需求，使整个系统始终保持高效节能的最佳状态。可实现恒压变量、双恒压变量等控制方式，多种启停控制方式，该系统可以通过人意修改参数指令（如压力设定值、控制顺序、控制电机数量、压力上下限、PID值、加减速时间等）；具有完善的电气安全保护措施，对过流、过压、欠压、过载、断水等故障均能自行诊断并报警。? 为保证小区的供水正常，利用PLC控制的变频调速恒压供水系统，按照用户的需求按需调节水泵流量，根据夜间用水少可以只开一个小流量泵，并满足用户的流量需求，使真个系统始终保持高效节能的最佳状态。 关键词：变频器；可编程控制器；恒压供水? Abstract This design adopts \one inverter control more water pump pump control system. Here using the PLC design a set of variable frequency speed regulation constant pressure water supply system, the system can automatically adjust according to network instantaneous pressure change of a rotational speed of pumps and water pumps more input and exit, pipeline ZhuGanGuan outlet in a constant set pressure value, and satisfy the users demand, the whole system always maintain the best condition of high efficiency and energy saving. Can realize constant pressure variable, double constant pressure variable control mode, such as a variety of start-stop control mode, the system can be modified by disappointing parameter instructions (such as pressure set data, control the order quantity, control motor, pressure on the lower limit, the PID value, deceleration time, etc.); Is the perfect electrical safety protection measures, lying, overvoltage, undervoltage, overload and water fault, etc to diagnose and report to the police. ? In order to ensure the village water supply is normal, the use of PLC control of frequency conversion velocity modulation constant pressure water supply system, in accordance with user requirements according to the need to adjust the pump flow, according to the night less water can only open a small flow pump, and satisfy t