Lai steel is medium-sized profiled bar factory is one has 90 time international the modern rolling mill of advanced level. Main and mechanical equipment is offerred by company of iron of Japanese new day, equipment of electric, automation is offerred by Japanese Toshiba company, it is the first Lian Zhu of countrywide, shrinkage fitting, connect product line of make friends short circuit, producible with economic section section - the product of a variety of norms that H profiled bar gives priority to. Heat curiums the area regards the join between make friends line and finishing as ligament, its control a function to whether stabilize the rolling stability that decided make friends line reliably. The timing that communication transducer uses to be used at electric machinery main transfer machinery in the design is controlled. The functional of transducer frequency control is the way of timing of a kind of electromotor with the quickest development in latter-day and electric project, the good performance of transducer makes its receive wider and wider application in industry. ACS600 transducer is control of ABB company direct torsion (DTC) technology, give the high-powered transducer that adds up to a lot of and advanced production workmanship to roll out. It has very wide power range, good rate controls character. Protect function and agile process designing ability thoroughly. Consequently, it can satisfy the industrial field application of great majority. ACS600 transducer has unique Electromechanical character and torsion control, electric machinery to differentiate move (the main function of IDRUN) and speed ego fine tuning. Lai steel is path of roller of input of rolled piece of medium-sized rolling mill, hot pull according to bed of equipment, tine etc have gearshift demand, mature when control is designed the good performance of ACS600 transducer, final decision chose it. The applied of transducer in Lai steel the transducer in medium-sized control system realizes control through DCS, if block diagram of control of frequency conversion structure pursues 1: Graph 1: Path of roller of input of 1 rolled piece dominates composition of a picture of knot of frequency conversion control the requirement according to product length, rolled piece is in after giving U5, should in roller of the job after U5 and heat curiums roller locates on the road hand-in-hand travel section, age the bed parts again next the head paragraph with end paragraph pull. After rolled piece passes rolling of finish rolling aircrew, convey to curium to heat roller on the road, according to the specified cut lengths of set, 1# scale machine has fixed position, 1# heat curiums have section, after section is finished, head rolled piece conveys 2# scale machine, 2# heat curiums cold bed is pulled after cutting a head, caudal rolled piece conveys cold bed is pulled directly after 2# scale machine. Although its process is simple, but it is very difficult however to should assure to control precision, in the production previously, rolled piece has run to cause arch steel, useless steel before scale machine, or sometimes rolled piece does not run to reach the designated position, undertake is versed in intervening, lose time. Go up feedback of value of reference of the moving instruction that path of roller of the job after accepting U5 and heat curium roller, speed, speed is worth a machine reach heat to curium roller pulse generator measured value; Heat of 1# , 2# curiums the position; Heat of 1# , 2# curiums clamp position; Heat of 1# , 2# curiums buy of scale seat number; Work station operates switch signal. Run control program next, give out signal to control transducer to send corresponding roller path well and truly rolled piece. Rolled piece is deferent if the trend pursues 2: Graph 2 rolled piece are deferent 2 heat of of trend graph curium of device control character has two heat to curium equipment, in producing a course need control is entered curium, do not enter curium, the operation such as go back origin, to solve these problems, must curium to heat the condition of relevant signal has an accurate assurance, build dog accordingly system. The relevant signal that dog has: The hand is moved into curium instruction, semi-automatic into curium enter instruction, automatically curium instruction; Proportioning valve outputs parameter; Into curium journey coder is worth; Clamp runs an instruction automatically; Clamp coder is numeric; Oil feed pump and scavenge oil pump run instruction, oil feeding reservoirs and signal of oil level of oil sump tank. Use these signal to undertake controlling, transducer accepts signal to drive electric machinery to complete the action that heat occupies. Graph 3: Curium cut electric current and of rate plan 3 tine bed pulls device of cold bed of type of control tine also is hot curium one of crucial equipment of the area, this equipment moving position is good, deciding to heat up the manufacturing rhythm that curiums roller, in resembling producing a course, appear sometimes tine type cold bed does not rise, after rising do not drop after translation, translation and start of tine type cold bed is slow wait for a phenomenon, meeting influence heat curiums roller path is moved send efficiency, and bring about finish rolling to pile steel. Relevant signal has: Tine type cold bed is automatic " ONECYCLE " instruction, semi-automatic " ONECYCLE " instruction and hand use a statement; Rise, drop, advancement and return electromagnetism a powerful person to output; Ascendant spacing, drop spacing, ongoing spacing and return spacing condition, relevant work station operates signal (include type of movable mould of automatic mode, semi-automatic mode, hand, ONECYCLE to start pushbutton to wait for signal) . If graph of course of start of tine type cold bed pursues 4. Graph 4: Transducer of of measure of interference rejection of graph of course of start of tine type cold bed is mixed to other equipment, detecting element control parts of an apparatus generates interference, this kind of interference is inevitable. Because the input of transducer is rectification circuit partly, output is inversion circuit partly, they are what involve action by step aside is nonlinear component comprises, and in the process that opening circuit, should arise tall second harmonic, the voltage weaveform that makes its input power source and output thereby and voltaic weaveform produce distortion. The 1 the most general pattern that transmitting interference through common ground wire is interference transmission. The ground connection of the ground contact that will use line of force and control line is the basic method that cuts off this one way apart, be about to the earthing terminal of dynamical plant receives ground wire to go up, receive the earthing terminal of control equipment this unit dish on metallic crust. When 2 line stand by the lead that has interference source electricity, interference is met by revulsive go up to line, make the signal on line is disturbed, wiring depart disturbs effective to eliminating this to plant. Actual a high-pressured cable, power cable, control cable often takes a line apart with appearance cable, computer cable, cent walks along different bridge, even if the control line of transducer is best also rather advocate loop line takes a line with perpendicular means. A. Before transducer side installs circuit reactor, can restrain overvoltage of power source side, can reduce the voltaic distortion that produces by transducer, avoid to make advocate power source is disturbed badly. B.
Filter of passive of the circuit that install LC is added before transducer, filter is dropped tall second harmonic. Filter includes a lot of form, each class filter is dropped corresponding tall second harmonic. C.
Add outfit and load and the active compensator with shunt-wound power source, the filter wave electric current that returns way through automatic generation will eliminate power source and load medium to harmonic electric current. D.
When the around environment of equipment is disturbed by electromagnetism, should furnish fights radio frequency to disturb filter, can decrease advocate the conducted emission of power source, and should adopt cable of measure screen electric machinery. E.
When electric machinery cable length is more than 50m or 80m(is not screen) when, to prevent the instantaneous overvoltage when electric machinery is started, reduce electric machinery the discharge leakage current to the ground and noise, protect electromotor, reactor is installed between transducer and electric machinery. In Lai steel the design of medium-sized control system and in carrying out, the transducer that if the graph is shown 5 times,used defends interference measure, the result is favorable, the effect that other equipment suffers interference is little, control effect is good, moving stability. Graph 5: The design of frequency conversion control that because use,transducer prevents of interference principle graph is advanced and reasonable, control effect is good, moving stability is reliable, very few occurrence problem, created enormous economic benefits. CNC Milling