一种基于PLC和变频器的中央空调循环水节能控制系统设计

A Central Air Conditioning Circulating Water Energy Saving Control System Design Based on PLC and Frequency Converter

针对中央空调系统的控制原理及控制要求,利用PLC、变频器及PLC的模拟量模块对其进行控制系统设计,利用PLC的PID调节功能来实现温差恒定。FX2N-2DA将数字量转换成模拟量,根据进水和出水的温差自动调节来控制变频器的转速,达到节能的目的。

Aiming at the control principle and control requirement of the central air conditioning system,we use thaen alog module of PLC,frequency converter and PLC to design the control system,and make use of the PID adjustment function of PLC t o achieve the constant temperature difference.FX2N-2DA converts the digital quantity into the analog quantity,and controls tshpeeed of the frequency converter according to the temperature differen coef the water and the water,so as to achieve the purpose of saving regnye