求翻译：本系统包含两台变频风机，它们组成变频循环运行方式。采用变频器实现对风机电机的软启动和变频调速，运行切换采用“先启先停”的原则。温度传感器检测当前回风温度信号，送入PLC与设定值比较后进行PID运算，从而控制变频器的输出电压和频率，进而改变风机电机的转速来改变供风量，最终保持室内的温度稳定在设定值附近。通过工控机与PLC的连接，以及通过RS485将PLC与变频的连接，采用组态软件完成系统监控，实现了运行状态动态显示及参数、报警的设定和查询等。是什么意思？

The system consists of two variable frequency fans, they are composed of frequency conversion cycle run. The inverter is used to achieve the soft-start and frequency control on the fan motor, run the switch using the principle of "first initial first stop". Temperature sensor detects the return air

This system consists of two variable speed blower, they run in a loop variable frequency composition. A frequency converter for the blower motor soft-start, and frequency control, and run the switch with the first initial first down" principle. Temperature sensors detect the current return air tempe

This system contains two frequency conversion air blowers, they compose the frequency conversion shuttle service way.Uses the frequency changer realization to the air blower electrical machinery soft start and the frequency conversion velocity modulation, the movement cut use “first opens stops firs

This system contains two inverter fan, that make up the frequency cycle runs. Frequency inverter based on soft start of fan motor and variable speed, run switch "inception to stop" principle. Temperature sensor to detect the current air temperature signal comparison set values for PID and PLC operat

正在翻译，请等待...