The pace takes the direct control of electric machinery PLC

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  • source:JUSTYN CNC Machining
The summary put forward a kind to use but program controller (the method that PLC) controls a pace to enter electric machinery directly. This method already applied at automatic product line in cutting bag length error to compensate a system automatically. Keyword: The pace controls 1 foreword pace to enter electric machinery into electric machinery PLC is a kind of figure that becomes pulse signal commutation angular displacement electromagnetism carries out device. The angular displacement that the pace enters electric machinery and input pulse number becomes direct ratio, its rotate speed and pulse frequency become direct ratio, the appearance sequence of the each photograph winding that its turn to to enter electric machinery to the pace with pulse allocation is concerned. Because the corner into electric machinery, rotate speed mixes the pace,change direction to all can use a number to measure (pulse) control, reason pace applies extensively at digital servo domain into electric machinery. Graph the 1 representative application that stated the pace enters electric machinery. Graph 1 pace pursues medium into the representative application of electric machinery, inputting signal arise by the sensor in servo. Instruction pulse controller controls a process on specific servo definitely. Can use special and logistic circuit, current and multi-purpose odd a microcomputer and interface circuit composition. Annular alloter is string together the onefold pulse of the input mix by working way change direction respectively ordinal enter electric machinery to the pace to join the power amplifier of each photograph winding allocates pulse, so that form,rotate magnetic field. Annular pulse alloter uses special integrated circuit to wait like CH250 more form. The faint signal of each photograph that forms from this magnifies via the power amplifier of each photograph, produce enough electromagnetism torsion to make electromotor rotates. The architect that the design of departmental cent in the graph, type selecting, join often asks to control a system costs much energy and labor. Of interface signal match and yuan the quality of parts of an apparatus dependability impact to whole system is very big. The article offers a kind of 2 means that controls a pace to enter electric machinery directly with PLC one kind is used but program controller (the method that PLC) controls a pace to enter electric machinery directly, if pursue,2 are shown. The advantage of this technology course is: Reduce the workload that the system designs greatly, of signal of interface of nonexistent departmental cent match a question, raise systematic dependability. Whole control system enters electric machinery to comprise by PLC and pace. The function that controls computer PLC as a kind of industry is stronger and stronger. Can use at switch logic to control not just, still can use at closed circuit process to control, can comprise multistage to control a system with other computer. Had the support of the powerful function of PLC, the task of the controller of different instruction pulse of all sorts of different control systems all can use the different control program of PLC to finish. Raise two characteristic requirements to PLC to the function of annular pulse alloter and power amplifier. It is the PLC that applies here had better be the PLC that has technology of real time refresh, the frequency that makes output signal can achieve Zhi of thousands of conspicuous or taller. Its purpose is to make annular pulse allocates can have taller allocation speed, make full use of the pace answers ability into the speed of electric machinery, raise the fast sex of whole system. The 2 output port that are PLC itself should use high-power transistor, enter electric machinery in order to satisfy a condition each photograph winding the drive requirement of several tens of volt pulse voltage, pulse electric current. What should point out is the PLC that uses relay or silicon controlled rectifier to do output port, although software is annular,pulse allocation can achieve high speed requirement, but because output port parts of an apparatus hard high speed guides connect and close direct current source, cannot enter electric machinery to the pace each photograph winding provides drive pulse electricity, reason cannot be used at the pace to be controlled directly into the PLC of electric machinery. To satisfying one, the PLC of 19 requirements, the IP1612DC-220 that is like American IPM company but program controller, can have direct control into electric machinery to the pace. Graph 2 paces control the author to use this kind of method successfully at ZXJ1000-C prestressing force directly into the PLC of electric machinery compound make bag of automatic product line in cutting bag of error to compensate a system automatically. The bag that the system measures sensor grows error signal to be sent by the input port of PLC, if pursue,3 are shown. According to error and compensatory algorithm, by the program of PLC pace of automatic cipher out enters electric machinery to answer compensatory changes direction to be counted with corner pace, and by annular allocation the program undertakes through outputting port Y9, Y10, Y11 annular pulse allocates, what control the 48V direct current source that receives a pace to enter winding of electric machinery three-phase thereby is ordinal, break, form rotate magnetic field, make the pace turns into electric machinery. The roll that the pace eats electric machinery is differred via machinery again fast implement overlay arrives advocate in transmission catenary, make bag chief error is able to compensate. Entering electric machinery as a result of the pace is inductance sex load, dc block is very small, lest pulse electric current crosses port of big damage PLC,reason receives current limliting resistor, namely the high-power transistor of correspondence of place of Y9, Y10, Y11. When place of Y9, Y10, Y11 corresponding high-power transistor presses: Y9-Y9Y10-Y10-Y10Y11-Y11 - Y11Y9-Y9... ordinal guide, when disconnecting, the situation is turning into electric machinery. By: Y9-Y9Y11-Y11-Y11Y10-Y10-Y10Y9-Y9... ordinal guide, when disconnecting, the pace inverts into electric machinery. Namely the pace presses three-phase into electric machinery 6 take the job. Every time the pace takes electric machinery make a move, the pace number that annular pulse distributes a program is decreased one, when the pace number is decreased for zero hour, stop annular pulse to allocate, wait to measure the input of the error the next time. Graph 3 specific application pursue the function of error compensation system that 3 last words use PLC to control a pace to enter electric machinery directly perfect, flexibility big, reliability is high. This product line already won award of progress of national science and technology. What emphasize particularly is the method that uses PLC to control a pace to enter electric machinery directly, the workload that reduced systematic design, can shorten greatly development cycle, inside certain limits, have taller promotion and economic value. CNC Milling CNC Machining