In this paper, the control principle of VVVF Providing-water system is introduced, mainly introduces structural properties of PLC control system, and the design method of hardware and software.
本文介绍了变频调速供水系统的原理，重点介绍了PLC控制系统的结构特点及系统硬件和软件设计方法。
The paper introduces the composition, principle and dynamical performances of the closed loop VVVF system using magneto electric pulse tacho apparatus to constitute the slip frequency control.
介绍采用磁电脉冲测速构成转差频率控制的闭环变频调速系统的组成、原理及动态性能。
First, this paper presents a brief introduce to the VVVF system's principle of work, theoretically analyzed the VVVF system's mechanical characteristics.
文中首先对变频调速系统的工作原理做了简单的介绍，从理论上分析了变频调速系统的机械特性。
The energy-saving principle of VVVF controlled hydraulic elevators with pressure accumulators is introduced.
介绍了配置蓄能器的变频驱动液压电梯控制系统的节能原理。
The energy-saving principle of VVVF controlled hydraulic elevators with pressure accumulators is introduced.
介绍了配置蓄能器的变频驱动液压电梯控制系统的节能原理。
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