Emerson CT PLC and inverter in the application of horizontal steel ball ball lapping machine

Abstract: automatic frequency conversion ball ball lapping machine is the national key new product, which the electric part design using RS485 communication, fully used the communication function of PLC and frequency converter, make whole design optimization. Key words: frequency converter; Programmable controller; RS485 communication port; 1 introduction programmable frequency steel ball steel ball lapping machine machine is my company's main products, production in China the first place, and bulk exports the United States, Germany, Japan, Korea, Italy and other countries. Product design has absorbed a number of advanced technology at home and abroad, in this paper, the electrical drive control part. Since the ninety s, the variable frequency drive technology perfected, its speed stability, energy saving, convenient and reliable, has completely replaced the original slip speed and dc speed control. The programmable controller is easy to programming, easy to implement the traditional relay control can achieve many functions. PLC and frequency converter system integration automation has become a solution for the preferred product design. RS485 communication with two wires, safe and reliable and the transmission distance is widely used in frequency converter and PLC, this makes the frequency converter and PLC controller communication is very convenient, low cost and improve the competitiveness of the products. 2 process description grinding machine the main action of the rotating grinding disc by the main gear motor via a pair of v-belt pulley, through the unloading zones within the spline of the drive shaft rotation, losing materials plate after a pair of sprocket transmission by deceleration motor and worm reducer, after reduction by disc straight drive gear mesh material rotating. Both need to choose different rotation speed to process different series of steel ball, therefore selects the frequency control of motor speed. For safety during the machine running in the system are also added to the protection function. Such as spindle control running close to switch, mounted on a machine tool spindle on the big pulley, monitoring the movement of grinding state at any time, to prevent the belt creep grinding disc jammed, when the speed is lower than normal, parking alarm; In addition to a speed testing, raw material also pile with the ball down quickly, if back to normal in a set time to run automatically. 3 3 of the system hardware design. 1 single Emerson CT EC10 series small PLC controller automation platform because of its fast, communications networking ability strong, programming, simulation operation convenient, flexible secrecy is strong, strong anti-interference ability, stable and reliable performance, steel ball lapping machine become a steel ball ball lapping machine PLC automation platform of choice. According to engineering experience, Emerson EV1000 series inverter can very low failure rate, can achieve high torque, wide speed range, drive, have superior anti tripping, performance of bad power grid, high temperature, humidity and dust have a greater ability to adapt, can better meet the steel ball the diversification of special equipment for making use of the environment, can realize single brand with technology integration platform, also be the first choice of the project design. The project by choosing Emerson EC10 - Small PLC and EV1000 bra - 1614 4 t0055g and EV1000-2 s0007g frequency converter, the single automation technology integration platform, such as EC10 PLC of Emerson CT series inverter has concise communication instruction, an instruction to control frequency converter operation control. 3. Main motor electrical principle (2 electrical principle of the design system Motor control and the main raw material with) As shown in figure 1. For user control and monitor the running speed, motor speed by potentiometer adjustment, its value by the linear digital display table shows, not through communication control. The command button line directly connect to PLC switch input point. PLC— — Frequency converter for motor start, stop and point function by using communication control mode, use twisted-pair by RS485 mouth PLC start-stop control of frequency converter, so rarely take PLC controller output points, also need not use contactor control, reduce the cost of the machine tool. EV1000 RS485 mouth terminal connected directly, very convenient. But it's important to note that RS485 mouth '+', '- 'The polarity cannot reverse, or no action. Because the inverter itself has over current, over voltage, under voltage, grounding, multiple protection functions such as overheat and overload, once the abnormal failure, normally open point RA, RC closed, inverter output stopped immediately, the parking will disconnect all actions and call the police, we will be connected to the PLC input point to control. Inverter failure can view the frequency converter screen content, control frequency converter operation instruction abnormal reasons and disposal methods, adopt corresponding measures to deal with. Inverter multiple protection for the output function that we do not need to plus protection of motor in the link, pick up directly in the inverter output terminals. In view of the frequency converter input protection are relatively weak, in the input with no fuse circuit breaker QF inverse time thermal protection. Figure 1 electrical principle 4 system software design EV1000 inverter has the rich control function. Because the two ball lapping machine control motor are gear motor, choose to do static self-tuning, then the highest operating frequency, the lowest operating frequency, worldwide attention point move frequency, add/deceleration time, frequency source instructions, signal source, parking, overload alarm set parameters such as detection and time.
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