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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,该系统可以通过任意修改参数指令(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 plan mainly use the variable pumps control system of a frequency conversion controls several water pumps. Designs a set of one kind of frequency this system may act according to pipe network instantaneous pressure variation, control add or decrease pump. Doing this can make output of pipe network constant pressure value and satisfy the need of user. Consequently the system can be maintained the state of high efficiency and energy saving. This system may revise the parameter instruction (for example pressure to suppose definite value, control order, control the quantity of electrical machine, pressure lower limit, the PID value, adds and subtracts fast time and so on); It has the consummation electrical safekeeping measure can judge oneself and alarm the over-current, over-pressure, less-pressure, the overload, the stop of water supply and so on. (科教范文网http://fw.NSEAC.com编辑发布)
In order to make sure regular water supply , the water supply system used PLC and frequency conversion, a low power pump can be used during night. The pump may satisfy needed water supply at that time. The system can be in state of high efficiency and energy saving.
Key words : Frequency conversion PLC constant pressure water supply
目 录
摘要………………………………………………………………………
Abstract…………………………………………………………………
第1章 绪论……………………………………………………………
1.1 引言………………………………………………………………
1.2 变频恒压供水系统的国内外研究现状…………………………
1.3 PLC的发展概况…………………………………………………
1.4 本文的主要研究内容……………………………………………
第2章 水泵调控技术………………………………………………….
2.1 水泵调控技术……………………………………………………
2.1.1 水泵参数…………………………………………………….
2.1.2 调速节能分析……………………………………………….
2.2 常用的调速方式…………………………………………………
2.3 供水系统变频调速运行的工作原理……………………………
第3章 方案的基本的选择…………………………………………….
3.1 PLC的选择………………………………………………………
3.1.1 PLC的组成………………………………………………….
(转载自http://zw.NSEaC.com科教作文网)