supermarket refrigerated showcase » article > walk-in display coolers > display cases The characteristics, classification and application of the controller
display cases The characteristics, classification and application of the controller
author: supermarket refrigerated showcase category: walk-in display coolers Views: 556Time: 2016-08-22
display cases The characteristics, classification and application of the controller
Functional relationship. The control law and control quality of the automatic adjustment control system are mainly determined by the controller. According to the different control laws of the controller, the controller can be divided into two-position controller, proportional controller, etc., and their corresponding control systems are called two-position control system, proportional control system, etc. respectively. On the premise of meeting the requirements of the production process, the differential range of the controller should be adjusted as large as possible to reduce the number of actions of the controller and extend its service life. The so-called differential range refers to the difference between the controlled parameters when the controller output contacts are fully open and fully closed. In the setting value of the adjusted parameter of the adjustment object, the corresponding relationship between the base of the adjusted parameter, the control accuracy, the upper and lower limits, and the differential range. For example, the temperature setting value of display cases in the cold storage room is -8±2℃. When the storage temperature reaches the upper limit of the setting value -6℃, the liquid supply solenoid valve of the evaporator is opened to keep the evaporator continuing to supply liquid for cooling. ; When the cabinet temperature reaches the lower limit of the set value -10℃, the evaporator's liquid supply solenoid valve is closed, and the evaporator's liquid supply is stopped without cooling. This control method is determined by the dual-position control characteristics of the controller. Due to the large fluctuation of the controlled temperature, it is more used in refrigeration systems that do not require high temperature control accuracy. Proportional control system means that the actuator action of the system is proportional to the deviation of the adjusted parameter, and is often used in refrigeration systems that require high control accuracy in display cases.
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