Typical applications of PLC in electric control - Electric power technology -

< P > typical application of PLC in electric control < / P > < P > use Japan's standing stones ( OMRON） Company produce C20p type PLC, designed three the application of PLC in the three-phase asynchronous motor control, control ladder diagram is given, program and input and output wiring diagram. < / P > keywords: three-phase asynchronous motor of PLC ladder diagram programming < P > < / P > < P align = left > 1, the introduction of programmable controller ( PLC可编程序逻辑控制器) Is technology made by microcomputer automatic control equipment. He is given priority to with sequence control, loop adjustment is complementary, can complete logic, timing, memory and arithmetic operations, and other functions. With the development of PLC technology, its function is becoming more and more integration is higher and higher, the network function is stronger and stronger, PLC and upper PC connected to the formation of the PLC and its network technology widely used in industrial automation control, PLC integrating SanDian, has good control precision and high reliability, makes the PLC is a mainstay of the industrial automation. The manufacturer and model of PLC, a wide range of different models, self-sustaining have different programming languages and application method, this thesis use Japan made stone company OMRON PLC C20p type, design for the application of PLC controller in the three-phase asynchronous motor control, compared with the traditional relay control, the control speed, high reliability, strong flexibility, etc, can be used as a reference of college student learning PLC control technology, also can be used as industrial automatic control circuit of the motor. 2 the PLC application in the motor control [1 ~ 3] 2. 1 three-phase asynchronous motor and reversing control? Asked when the forward button, motor is turned in a row, the reverse button doesn't work, Interlock) Power off, press the stop button motor, reverse button motor reversal in a row, forward doesn't work. As shown in figure 1 for three-phase asynchronous motor and reversing control principle diagram. 2. 2 three-phase asynchronous motor Y - Delta start? For starting motor coil Y type, after a period of time automatically run into delta form, request Y after disconnecting delta form to start, to prevent Y not delta form start shorting the power cut off. As shown in figure 2 is a three-phase asynchronous motor Y - Delta start control principle diagram. 吗? 2. 3 time three-phase asynchronous motor control? Request 1 electric motor M1 start after 5 s, electric motor 2 M2 automatically start, only when the machine stops M2, 2 through 5 s delay, M1 automatically stop. As shown in figure 3 is a time of three-phase asynchronous motor control principle diagram. 3 program written and run? Connect to PLC programmer and after turning on the power supply, PLC power indicator light is lit, the programmer switch to the 'PROGRAM' position, then the PLC in a state of programming. Programmer shows the PASSWORD! Then press Clr and Montr keys in turn until the screen display address number 0000, then input program. Before input program, need to remove content from the memory, in turn, press the Clr, Play/Set, Not the Rec/Reset and Montr keys, to clear all procedures. According to the above three kinds of control ladder diagram program instruction will be three or written to the PLC control program, when the above three parts after the input to the PLC in the machine process, with the up and down direction key read written procedures, such as the program is wrong, insert instructions and delete modify the program available. After the input the correct process, respectively according to the figure 1 ( 一) And ( c） Connection PLC wiring and main loop circuit for motor and reversing control, according to the figure 2 ( 一) 吗? And ( c） Connections for motor Y - Delta start, according to the figure 3 ( 一) 吗? And ( c） Connection circuit to realize the time control of the machine. This design can be a one-time all the three kinds of control circuit of program input, three kinds of control circuit at the same time, run time, press the SBF, SBR motor and reversing start, press the SB1, SB2 control motor Y - Delta start, press SB3, SB4 motor order start, each other, get twice the result with half the effort, implements a PLC control circuit in the form at the same time.

? < / P > < P align = center > references < / P > < P > [1] qin Zeng Huang? Electrical engineering ( ) : 。 The fifth edition [M]. Beijing: higher education press, 1999 [2] is deng, KuangSuiFang. Electrical and PLC application technology [M]. Beijing: mechanical industry press, 1999 [3] Wu Daoti, hensing m. production. Electric experiment [M]. Beijing: higher education press, 1995 (< / P > technology zone can be used in high voltage test of the active load is read power electronic device and its characteristics are power electronic device development trend based on multiple SEPIC chopper circuit of ultracapacitors equalizing strategy generating system used in the design process of virtual prototype tutorials, rounding
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