PLC automatic control system to achieve automatic control Compressed Air Station-PLC, automatic cont   by jekky

Widely used in cotton textile enterprises where air-jet looms, air compressor station construction is an important ancillary works. Textile park in Tianjin with all the main air compressor station equipment centrifugal air compressors, refrigerated air dryer, through gas tank, connecting pipes and valves composed of compressed air supply system, and auxiliary cooling systems, instrument air system, computer testing system, to achieve the air compressor station for the production line to ensure different pressure, different gas demand load. Under this premise, ensure the supply of qualified quality, to meet stable gas supply pressure, automatic adjustment of gas flow rate control is the basic task of compressed air station. With increasing levels of automation, unmanned air compression station on the construction of the discussion is the inevitable process of development issues.

Need to control air system Used in days of cotton spinning Investment Holdings Limited, a factory’s air compressor station, equipped with 4 sets 70M3/min4 Taiwan, 53M3/min4 Taiwan, 48M3/min2 Taiwan, 43M3/min4 centrifugal compressor and a platform 42.5M3/min screw air compressor, with a corresponding capacity of refrigerated dryers. Air compressor equipment with the CMC’s own controller, automatic control and protection of the host can run automatically prompt job information, fault alarm and protection with shutdown function, can automatically load and unload the size of gas consumption, and is equipped with LCD screen for on-site observation of the process parameters and equipment status, with RS422/485 communication interface, can be achieved with on-site control room full of computer monitoring system to connect.

Present, air compressor station automation system, through the Siemens S7-300 programmable controller, part of the air compressor to run real-time data collected by RS422/485 communication interface into PLC Control systems, and data to be displayed on site control room computer to replace the traditional instrumentation. But there is no control on the compressor.

Air compressor equipment comes with CMC controller has good control a single air compressor, but do not have overall control of the compressed air system capacity. In the compressed air system, the relative adjustment of a single air compressor, automatic regulation of the whole compressed air system is more important meaning:

single compressed air system compressor can not guarantee the stability of the overall gas pressure, while the overall compressed air system can be effectively controlled air pressure to keep the system stable.

overall load balancing, reduce exhaust shorting, you can save more energy, save on labor costs.
unmanned operation can be achieved, according to actual needs automatic boot or load the compressor in order to maintain system pressure.

air compressor can run regular interruption of data and police records, such as jumping, surge, communications failure, stress.

In the existing PLC System, compressed air system does not achieve the overall control function. As the air compressor comes with CMC controller provides RS422/485 communication interface, all data acquisition and control functions are achieved through the communication interface, compared to the original control system, no need to increase investment in hardware, only needs to be improved and increasing the control software to achieve the overall control of compressed air system.

Addition to air compressor equipment, air compressor package can also be frozen with the dryer into RS422/485 network to achieve full self-control compressed air supply equipment.

Compressed Air Station Other Automatic Control System

Addition to compressed air supply systems, compressed air station also needs to control other systems, such as the water cycle cooling system. Control of these systems and compressed air supply systems, mainly using the traditional control mode. Collected using the instrument operating parameters necessary to carry out data processing and analysis of operation, the output control signals to the actuator control system can be achieved.

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