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Design of Fan Control System Based on PLC

Abstract

has been developed for the present programmable controller, referred to as PLC. PLC is the com With the development of science and technology, the early programmable logic controller bination of the computer control

technology and relay control technology, which is developed on the order controller.PLC is a special industrial computer with digital control for

microprocessor as the core. Even in a very harsh industrial environment, it can be maintained

In the production of coal mine, the system of the main fan plays an important role, and the fan can work normally, which directly affects the

production of coal mine. So the design and research of PLC control system of frequency control of motor speed, not only can greatly improve the

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mechanization and automation level of the coal mine production, but also a lot of power, has high economic benefit.

In this paper, the design and research of the state monitoring and frequency conversion speed regulation for the PLC control of the mine fan are carried out with the PLC control technology, the frequency conversion technology and the configuration monitoring technology. PLC based control equipment, introduces the application of programmable controller (PLC) in the mine ventilation system; discusses the fan to achieve automatic control system composition and design; relates to the hardware equipment selection and configuration; compiled the fan to achieve automatic control ladder diagram, and introduces briefly the PLC and other intelligent devices and personal computer network, composed of control system.

Keywords: Coal mine ventilator; PLC; Online monitoring

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Òý ÑÔ ............................................................................................................................1 1.1 PLC¼°·ç»ú¿ØÖÆÏµÍ³µÄ·¢Õ¹×´¿ö ......................................................................2 µÚ¶þÕ ×ÜÌå·½°¸Éè¼Æ ..................................................................................................5 2.1 ¿ØÖÆÏµÍ³µÄÒªÇó .................................................................................................5 2.2 ϵͳ¹¹³É¼°¹¤×÷Ô­Àí .........................................................................................5 2.3 ÀëÐÄ·ç»ú¿ØÖÆÔ­Àí·ÖÎö .....................................................................................6 µÚ3Õ ϵͳӲ¼þÉè¼Æ ................................................................................................10 3.1 ζȴ«¸ÐÆ÷µÄÑ¡Ôñ ...........................................................................................10 3.2 PLCµÄÑ¡Ôñ ................................................... 10 3.2.1 PLC¿ØÖÆÏµÍ³Éè¼ÆÁ÷³Ì ............................................................................ 10 µÚ4Õ ϵͳÈí¼þÉè¼Æ ................................................................................................15 4.1 PLC³ÌÐòÉè¼Æ ....................................................................................................15 4.1.1 ÀëÐÄ·ç»úת»»¹ý³Ì·ÖÎö ........................................................................... 18

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4.1.2 ʵÑéÖÐϵͳ¹¤×÷״̬ ............................................................................... 18 4.1.3 ʵÑéÖÐ״̬ת»»¹ý³ÌµÄʵÏÖ·½·¨ ........................................................... 19 4.2 ³ÌÐòÉè¼ÆµÄÌÝÐÎͼ ...........................................................................................19 ½áÂÛ ..............................................................................................................................25 ²Î¿¼ÎÄÏ× ......................................................................................................................27

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