求翻译：本文介绍采用plc可编程控制器和变频器调速的液位控制系统，控制系统的核心硬件由plc，变频器和恒压供水模型构成。是什么意思？

This article describes plc programmable logic controller and the inverter is the level control system, the core of the system hardware constitute plc, inverter and constant pressure water supply model.

This article describes a PLC programmable controller and drive the speed of the fluid control systems, control of the system's core hardware by the PLC, the converter and constant pressure water supply model.

This article introduced uses the plc programmable controller and the frequency changer velocity modulation fluid position control system, the control system core hardware by plc, the frequency changer and the constant pressure water supply model constitution.

This article describes the use of PLC programmable controller and inverter speed control of liquid level control system, core hardware of the control system by PLC and variable frequency and constant pressure water supply for model pose.

正在翻译，请等待...