Based on the embedded PLC control winding motor

Winding machine based on embedded PLC control Yu Gui Dong Juming welcome to e hall exhibition hall 3 PLC PLC programmable controller, PLC programming cable. 。 。 1 introduction our hospital with Huang Shike automatic control co. , LTD for many years history of university-enterprise cooperation, cooperation started the 'class' coldwell elevator industry caused wide public concern. Introduced in the PLC teaching content Huang Shike embedded PLC technology, has become our PLC teaching characteristics. Transformation of electrical control circuit is an important area of PLC technology, electrical automation, mechanical and electrical integration professional PLC is an important content of teaching. Based on the wound rotor asynchronous motor rotor string resistance starting control circuit transformation, for example, introduces the obstetric wei embedded PLC application in the electric control circuit transformation. 2 coldwell embedded PLC application profile coldwell embedded PLC has been widely used at home and abroad steel, automobile manufacturing, petrochemical, mining, electricity, machinery manufacturing, environmental protection and entertainment all walks of life, its application can be divided into the following categories: (probably 1) Used for switch control logic and order. ( 2) Used for numerical control machining. Integrated PLC and touch screen, which can realize numerical control of CNC machine tools. ( 3) Motion control. Coldwell embedded PLC to linear motion and position, velocity and acceleration of circular motion control, the realization of uniaxial and biaxial and multiaxial position control, has been widely used in all kinds of machinery, metal cutting machine tool, robot, assembly machinery, elevator, etc. ( 4) For analog testing and closed-loop process control. Coldwell embedded PLC analog signal, such as temperature, pressure for a/d conversion, and realize the closed loop pid control, has been widely used in the kiln, plastic extrusion molding machine, such as heat treatment furnace, heating furnace, boiler equipment and light industry, chemical industry, metallurgy, electric power, machinery, building materials and other industries. ( 5) Network. Coldwell embedded PLC communication between host and remote I/o communication, more communication between PLC and communication between PLC and other control equipment, PLC and the character screen, touch screen, the computer can form with centralized management and decentralized control of distributed control system. 3 winding asynchronous motor starting principle 3. 1 control circuit of three-phase wound asynchronous motor rotor loop can slip ring outside the concatenated variable resistance to reduce the starting current, which can increase the rotor circuit power factor and the purpose of starting torque. Adjust rotor loop resistance method are many, divided into two kinds of block adjustment and continuous adjustment, block adjustment principle of have time to adjust, current adjustment, the principle of speed adjustment as well as the principle of comprehensive adjustment and so on, as shown in figure 1 is a typical time principle of adjustment of wound rotor asynchronous motor level 3 start control circuit. Figure 1 3. 2 works starts up, close the power switch qs, press the start button sb2, contactor km electricity, motor concatenated complete resistor startup, then time relay kt1 coil electricity, after a certain time delay kt1 normally open contact closure, make km1 coil electricity, km1 main contact closure, the resistor r1 nipple, motor speed run, km1 auxiliary normally open contact closure at the same time, make the kt2 coil electricity. Kt2 after a delay, kt2 normally open contact closure, make km2 coil electricity and, km2 main contact closure, the resistor r2 nipple, motor continues to accelerate, at the same time km2 coil assisted normally open contact closure, is kt3 coil electricity, kt3 after delay, the normally open contact closure, make km3 coil electricity absorption merger self-locking, resistance r3 short sub. At this point, all the starting resistance is short, so the motor enter a state of stable operation, at the same time auxiliary normally closed contact of km3 make kt1 power cuts, in turn make km1, kt2, km2, kt3 lost electricity. Contactor km1, km2, km3 auxiliary normally closed contact of the concatenated in km coil circuit, the purpose is to ensure that only when the contactor all power in the state, namely the motor must be under the condition of the access to all resistance, in order to start. 4 line reconstruction based on programmable logic controller (PLC) 4. 1 PLC controller selection according to the control requirements, design requirements, selected model of PLC are as follows: ec - 08 m08r, it is by the Huang Shike wei e series PLC ( Compatible with mitsubishi fx2n series) , with 8 input, 8 road ( Relay) Output, while in this case actually only need 3 road input, 6 road output, the output with about a third of the allowance, input the leave allowance beyond one-third, fully meet the requirements: have step 8 k of memory, and in this case the user program capacity estimated at about twenty steps, quite enough; Support built-in canbus, 485, 232, communication function, is conducive to the future to network communications and other equipment. 4. Electric control design based on ec - 2 08 m 08 r coiling machine I/o interface of the embedded PLC address assignment as shown in table. PLC electric control principle is shown in figure 2. 4. 3 PLC ladder diagram program design of PLC ladder diagram design is shown in figure 3. 5 conclusion of obstetric embedded PLC for relay - The transformation of contactor control system greatly improves the reliability of the system, daily maintenance is extremely convenient, cost is relatively low, improve the production efficiency, the enterprise has obtained the good economic benefit and social benefit.
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