As a "green energy source" for cleanliness, environmental protection and energy saving, the solar hot water system has been widely accepted by society. Well-designed solar hot water systems not only need to arrange a reasonable collection surface layout, modeling and piping system layout, insulation, etc., but also must require the control system to do: 1 simple, practical, small size, light weight; 2 stable performance, Low requirements for the environment; 3 intelligent, integrated, unattended; 4 easy maintenance, replaceability; 5 full-featured, can be used with a variety of auxiliary energy facilities. The designed control system can comprehensively monitor information and adjust operating parameters. The KING-A solar hot water system is a typical and advanced product. From the circuit design, selection of power components, and the function of the software system, the operation requirements of the solar hot water system are fully guaranteed.
The optimal design of the controller circuit replaces the conventional logic circuits of traditional instruments with single-chip microcomputers and embedded systems, and a new generation of smart meters developed is the development direction of the instrument field. It has the functions of micro-computerization and intelligence of instruments and meters and has a small size in itself. , Low power consumption, stable performance and other advantages. The system has been selected through the use of MB89F202 dedicated microcontroller, the basic structure is embedded in the microcontroller inside the four temperature analog measurement circuit and voltage measurement circuit, using data correction, digital filtering, multi-channel input / output, self-diagnosis, power-down protection The new smart meter technology, therefore, powerful, strong anti-interference ability, stable performance, can adapt to a variety of complex work environments.
The display and operation of the template adopts the traditional SN74HC164N integrated circuit control, together with digital display, key operation and page display function. It can display a variety of monitoring information and data. It has the characteristics of long life and reliable operation.
The output control circuit of the module adopts ULN2003AG integrated circuit. It is isolated from the relay and strong electricity, effectively preventing the interference of the external working circuit, and the output current reaches 3A, which can control various working voltages.
The power supply adopts dual voltage stabilizing circuit, filtering and overcurrent protection circuit, which enhances the ability to resist power supply voltage fluctuations and the range of use. It also has protection function for the instrument itself.
Temperature and water level detection: The construction site of the solar hot water system is complex and diverse. Therefore, compensation measures must be taken according to the site temperature in order to maintain a high degree of metering. In order to accurately measure the temperature, a PT100 thermal resistor and an internal temperature compensation circuit are used to achieve an accuracy of 0.1°C. The temperature of the collected SCM is A/D conversion, data sampling and retention, digital filtering (filtering out interference signals), data processing, high speed, high accuracy, and supplemented by effective software control functions, constituting an excellent temperature measuring system. The detection of water level adopts segmented voltage measurement, which converts the 12V voltage into a single voltage signal in the field and reduces the signal line to three. This measurement method is not affected by construction distance, scale and dirt in the water tank, and interference signal. The best way to measure. And its shell adopts the traditional standard form, it is easy to install and coordinate with various distribution cabinets.
The versatile and easy-to-use software package is widely consulted by experts, construction agencies, and users. The features of the solar water heating system and the diversity of market requirements are based on the requirements of the software. The control functions are Sheung Shui and Cycling. , Antifreeze, constant temperature heating, water supply and auxiliary energy, system adjustments, etc. were designed software packages, has a universal nature, do not have to replace the control instrument due to different functions.
The system's water features include: direct water tank water, fixed temperature water, constant temperature water, regular water, regular anti-freezing water, full water level protection, etc.; cycle functions include: temperature difference cycle, fixed temperature water level difference cycle, Anti-freeze cycle, water supply cycle, etc.; Anti-freeze function includes: Antifreeze in the Sheung Shui, antifreeze in circulation, antifreeze in heating, etc., as well as constant temperature heating, water supply, and auxiliary energy. Four timing actions and two control parameters are automatically controlled according to parameters. Fully guaranteed to meet customer needs. The auxiliary energy interface can be connected to electric heating, air source heat pumps, gas, coal, oil boilers, etc. Some users have used this control instrument in the floor heating project of the solar hot water system and have also achieved good results. In addition, the input of its parameters is only based on the two key operations on the header, which is simple and reliable. Its display system shows temperature, water level, and various states, intuitive and clear. The various output controls are only connected to various control relay AC contactors and the like at the output terminals.
System performance analysis and application After comprehensive monitoring in the laboratory and monitoring in practical applications, the measurement accuracy of the system can reach 0.5 °C, the system performance is stable and reliable, the reliability is low, the failure rate is low, the requirements of the testing environment are met, and the circuit design achieves good Practicality and high cost performance. Compared with other control methods, it has powerful features, simple circuit, low single cost, long service life, and low failure rate. It is a relatively complete control instrument.
Optimum preparation quality
The grinding mode is available on the AccuTOM-100 and can be used for all types of materials (multiple two-way finishes are used between x-direction movements to ensure excellent flatness). Two grinding methods are provided for precise control of material removal to achieve optimum preparation results.
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