A regulator that uses digital technology and microelectronic technology to achieve closed-loop control, also known as a digital regulator, is a type of digital controller.
It accepts the measurement signal from the production process, and is processed by the internal digital circuit or microprocessor. According to a certain regulation law, it generates output digital signal or analog signal to drive the actuator to complete the closed-loop control of the production process.
Digital regulator is a new type of regulator developed in the 1970s on the basis of analog regulation instruments using digital technology and microelectronic technology. Due to the use of integrated circuits and large integrated circuits, it is very similar to a microcomputer, except that the function is mainly process adjustment.
Classification and function Digital regulators are divided into three types: digital hybrid ratio regulators, multiple loop regulators, and single loop regulators.
Digital mixing ratio regulator It is an instrument to control the mixing ratio of components. It is combined with flow meter and actuator to form mixing ratio control system and batch mixing control system, which is used for liquid-material mixing ratio batching delivery system and mixed products. .
The multi-loop adjuster is an instrument that uses a microprocessor to perform the multi-loop adjustment function. It can be applied independently to unit production devices (such as industrial furnaces, grinding towers, etc.) to complete all or most of the device control functions.
Since there are many types of single devices, the varieties and types of multi-loop regulators are also very complicated. A multi-loop controller can control 8 to 16 control loops, and some can also complete simple program control or batch control.
The single loop regulator uses a microprocessor to implement an instrument loop adjustment function. It has only one output that can be sent to the actuator to complete closed loop control.
Single loop regulators have two main purposes: one is for important system loops to improve system reliability and safety; the other is to replace analog faders to reduce the number of panel-mounted instruments or improve the functionality of the original loop, such as realizing advanced single-loop control, sequence control, batch control.
Development Trend The application of microcomputers to digital mixing ratio regulators is an important development trend. The function of the regulator has been expanded, such as the addition of temperature compensation and online analysis of mixed products. When the viscosity of the liquid and the mixing ratio change, the component ratio can be corrected in time.
In addition, the use of microcomputers is easy to realize the communication function, so that the operation of a single instrument becomes a multi-level control of the operation dispatched by the upper computer. Multi-loop and single-loop regulators will become field control equipment for integrated control systems The key is to be equipped with communication options.