Small freight elevator speed control system based on PLC control

Small freight elevator speed control system based on PLC controller control newmaker welcome to visit exhibition hall 2 e/driving, hoisting/lifting equipment exhibition hall crane, cantilever crane/balance machine/hand chain hoist, electric hoist, permanent magnet lifting electromagnet,. 。 。 1 the introduction of traditional elevator widely used ac wound rotor asynchronous motor rotor series resistance speed control mode, resistance for using relay - Contactor control, the control method of defect is apparent, not only mechanical shock, when braking and speed shift speed control performance is poor, external resistance energy consumption is large, and complex wiring, often appear fault, poor safety. With simple structure, low cost of squirrel-cage motor, and use the PLC controller and inverter of elevator control system, which can realize the elevator motor soft start and soft brake, namely slow when starting up, parking brake when slow, still can achieve more gear speed program control, make the middle of the lifting process is accelerated, the goods transportation up fast, stable and safe. 2 small freight elevator lifting process on the basic structure of the elevator is the use of drive motor and reversing winding wire rope hoisting cage up and down. Small freight elevator by general motors, pulley, wire rope, hanging cage and all kinds of main electric appliance and so on, its basic structure is shown in figure 1. SQ1 ~ SQ4 can be a travel switch, also can be close to switch, is used to position detection, limit role. Figure 1 elevator chart 1. Hoisting cage 2. Block 3. Block 4. Motor 5. SQ1 ~ SQ4 limit switch 3 PLC and inverter control speed regulation system of 3. More than 1 shift speed control according to the hanging basket in the lifting process, requires a from slow to fast and then from fast to slow the process of slow when starting up, namely fast after reach a certain speed, when the end, slow down and stop slowly, so it will soon be in figure 1 lifting process is divided into three schedule interval, the interval period of lifting speed is shown in figure 2. Press the start button SB2 (ascension Or down button SB3) , hanging cage smooth starting at a low speed speed, run to the desired location, speed fast in speed, and reaches the predetermined position, with a quick smooth stop. Figure 2 elevator speed in figure 3. 2 system hardware structure of automatic elevator control system is mainly composed of mitsubishi FX2N - 32 Mr Programmable controller, three reclamation SAMCO - I inverter, three-phase squirrel cage induction motor. System hardware connection as shown in figure 3. Figure 3 system hardware wiring PLC control instead of relay circuit on one hand, on the other hand, for system required by lifting and lowering, and by the limit switch for the position of the hoisting cage running information, through the PLC controller internal procedures after processing, the output Y0 ~ Y2 corresponding '0', '1' signal to control the inverter input terminal 2 df, FR, RR state, make the inverter in a timely manner according to the output shown in figure 2 the corresponding frequency, to control the running characteristics of the elevator. Speed gear by 2 df choice, each the size of the gear speed, through the study of the function of frequency converter set by PLC program to control the switching frequency. When PLC output Y0Y1Y2 status to '010', a speed frequency inverter output, elevator with 10 hz corresponding speed up, when for '110' state, two speed frequency inverter output, lift the corresponding speed up to 30 hz; Accordingly, when Y0Y1Y2 status to '001', '101', the elevator on 10 hz, 30 hz corresponding speed down. Diagram QF circuit breaker, isolating, over current, under voltage protection, etc. Scram button SB1, the up button SB2, the down button SB3 according to convenient operation can be installed at the bottom and top, or both installation, operation, just press the SB2 or SB3, system can automatically realize process control. 3. 3 SAMCO— I inverter main function instruction set Cd000 = 1; Select display frequency converter monitor ( HZ） Cd001=1 ； Choose external terminal signals as frequency converter operation instruction Cd002 = 1; Choose the operation panel 1 set the frequency converter frequency Cd007 = 30; Inverter frequency limit of 30 hzcd029 = 10; A speed frequency converter for 10 hzcd030 = 30; Frequency converter 2 speed of 30 hzcd049 = 5; Use the braking resistor Cd050 = 1; The motor can be positive &negative 3. 4 PLC ladder diagram when hoisting cage in the bottom, and SQ1 normally open contact closure, press the SB2, motor with one speed slowly rising, reached for SQ2 and SQ3 position, in a quick, slow rise accordingly. Down with similar, when in case of emergency, press the SB1, lifting the opportunity to stop at any position. 4 conclusion in the PLC and inverter control speed way instead of the original rotor series resistance speed control mode, are characterized by their smooth add, deceleration, reliable operation, greatly improving the degree of automation of the system. The system can be widely used in building construction, warehouse, restaurant industry, etc. , as fluctuation in the transmission system. References: 1] Wang Tingcai, wang wei. The principle and application of frequency converter [ M] 。 Mechanical industry press, 2005. ( 2] Xiong Yongchao, yong. Application of PLC in small freight elevator control system [ J] 。 Coal mine machinery, 2006, 4:681-683 [ 3] Mitsubishi FX2N programmable controller manual [ Z] 。 ( 4] SAMCO— I inverter using manual [ Z] 。
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