According to the actual situation of the control system, calculate the number of input points of the system, in line with the principle of saving components and reducing costs, select the Siemens fan disk, the central air conditioning system principle loop programmable controller application, an electrical automation year volume The central air conditioning system frame type modified by the period circle is used as the controller, the block analog output module, and the block analog input module.
Integrated input, output, a total of digital points, can be connected to an expansion module, the maximum expansion to the road digital point, or analog point, program and data storage space, an independent high-speed counter, independent high-speed pulse Output, with controller, communication programming port, communication protocol, communication protocol and free mode communication capability, can be fully adapted to some complex small and medium-sized systems.
The compressor inverter adopts the current vector control general-purpose inverter of Yaskawa Corporation of Japan, and the rated output capacity is: its modulation mode is optimized space vector control, the control mode is control, with torque boost, jog, brake, and more The functions of speed running, automatic voltage adjustment, arbitrary setting curve and communication with the host computer can fully meet the requirements of the modified system. The frequency control is determined by the analog quantity of the output.
For the control of the two pumps, due to their different power, the two inverters are separately controlled, and the new type of inverter of the same type suitable for the fan pump type load is selected. The surge current absorption circuit also has the most advanced life diagnosis and pre-function. It has large safety factor and has two modes of operation: automatic and manual. The manual signal is given by the potentiometer of the control cabinet door panel. The automatic signal passes through the pressure transmitter. A current configuration [more convenient, a self-contained energy-saving monitoring function, through the operation panel output terminal, a human-machine communication can show the effect of energy-saving. The system sets an over-temperature delay alarm, so when the condenser is flooded When the temperature upper limit value is set in the temperature high-report function, the timing function is started, and if the water temperature is still high after the delay period, the temperature controller sends an alarm signal, and the input is corresponding to the protection link action.
The pressure difference between the inlet and outlet of the system in the refrigerant water system is measured by Siemens' differential pressure type smart transmitter. The accuracy of the transmitter is up to level and it has functions such as remote control setting, data communication and self-diagnosis.
The rest of the display circuit and auxiliary circuit control remain in the original system.
For the detection component of the refrigerant water temperature, a temperature controller specially designed for the HVAC system manufactured by Siemens is used, which is a completely independent electronic temperature controller with HVAC or regulation. Can be connected to two sets of sensor temperature input and a group of passive digital input, the output signal voltage range is one, the overflow detection range can be changed to the group, the array of women, the fault, the water, the lower limit, the upper limit, the antifreeze switch, the exhaust pressure, the suction pressure, the cold pressure. The water test month pressure pump starts the search for the cooling pressure of the girl.
The project will be built in Jinfeng Town, Zhangjiagang, Jiangsu Province, China. After the project is put into production, the annual production volume will be 10,000 tons. The new rice hot rolling mill project adopts the latest technology and will be put into operation at the end of the year. By then, this line will become the most advanced and efficient coil production line in the world. “The successful signing of this project has once again consolidated the leadership position as a provider of electrical and automation system solutions for the steel and non-ferrous metals industry,â€
Shi Gugeng, global head of the Group's Steel and Non-Ferrous Metals Industry Department, introduced. “Our system takes into account the various production targets set by the customer. The latest technology and process control systems that ensure the operation of the production line are more reliable, efficient and energy efficient than the existing technology. The electrical and thermal insulation of the entire hot strip mill will be provided. Automated solutions, including process control models, process control, motors and associated drives, manufacturing execution systems, etc. through the human-machine interface. At the same time, the production process of the coil can be accurately tracked to improve production efficiency.
The entire design, supply and installation commissioning and customer training work is mainly done by the local team. In the past ten years, many large-scale projects of Shagang Group have been successfully completed. A global leader in power and automation technology, providing solutions to customers in the industrial and power industries to help customers improve their performance while reducing environmental impact. The Group's operations are located in many countries around the world, with its own employees.
It has a full range of business activities in China, including R&D, manufacturing, sales and service. In China, we have more than one month of employees, local companies, and sales and service branches throughout the country.
For further understanding, please visit the figure to give the hardware wiring diagram of the control compressor. According to the system requirements, think that the control core is to transform the compressor into a frequency conversion control mode, and use one inverter to drive three compressors. A total of inverters are required for the compressors. The inverter wiring is as shown.
System software design According to the control requirements, the control methods for the compressor and the pump can be divided into automatic and manual. When the system is operating in the automatic state, the control system automatically controls the temperature of the refrigerant water to achieve the temperature required by the air conditioning system by changing the frequency of the compressor power source according to the temperature feedback signal of the refrigerant water.
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