LOGO! Recording model machine with transducer the application in energy-saving control

Key Words: Foreword of Injection Machine; PLC; Converter is well-known the machine that note model is large family of bad news report, the machine that note model produces the workshop of plastic products to everyday all the electric energy that comparative is wasted for nothing, noise is very big also. And undertake to electromotor with transducer timing controls electromotor effectively to move, implementation is relatively ideal energy-saving. To unit of automation of this kind of diminutive, if choose PLC and feeling screen control, the system can use the little part function of PLC only, most function by unused. And a few miniature but program controls module (the LOGO that is like Xi Menzi! ) , in this kind of miniature control the circumstance also fulfils the automata function that touchs screen by PLC union can easy to doly, important is, by LOGO! Control system cost of composition wants a lot of lower. Give out here a kind LOGO! With transducer combination rises, implementation undertakes to recording model machine energy-saving pilot controls a system. The 1 machine that note model energy-saving principle should obtain frequency control energy-saving purpose, the key of the design is the extraction in recording model machine what signal, alternate via what kind of reexport controls signal as the input of transducer, obtain frequency control then, make electromotor presses the end that needs to output power. Can discover in producing practice, the electric current in the discharge electromagnetism a powerful person of built-in control circuit and coil of pressure electromagnetism a powerful person can regard the machine that note model as the signal that controls electromotor. Set these two quantities to be IL and IY respectively, when the some period of time that produces working procedure, these two quantities among them one of big when, for example of discharge electromagnetism a powerful person leave degree big, IL is big, the power that right now electromotor outputs is about big. When controlling electromotor with transducer, the input that sets some instantaneous transducer controls signal to be voltage signal U, the frequency that transducer outputs is F, namely F ∝ U. If electromotor power is P, rotate speed is N, when frequency control, fundamental frequency 50Hz is constant torsion timing below, torsion M and frequency F have nothing to do, have P ∝ N, and N ∝ F, because of U of this P ∝ . Change transducer input controls signal voltage U, output frequency with respect to what changed transducer, changed the power P of electromotor consequently. When U changes along with IL and IY, achieved make electromotor presses the end that needs to output power. The control signal that takes out from inside the machine that note model here is electric current, need to alternate via I /U so, become IL and IY commutation voltage U, and U ∝ IL (or IY) , send transducer input end U finally. For namely can section report can satisfy compression moulding quality again, the control algorithm that designs ideal is very important also. Pass an analysis, control algorithm designs as follows: A.

When IL and IY measurement are different, take if IL is equal to IY,regard an input as greatly voltaic signal I; , take one of aleatoric regarding <> as to input voltaic signal I0. B.

When I is less than I0 of a certain value, voltage U Ying Heng is 0, when I ≥ I0, voltage U just becomes direct ratio with I, namely U = KI, k and I0 all can be adjusted according to actual condition. 2 systems soft hardware designs this system with LOGO! Give priority to with transducer, complementary detect with electric current circuit of circuit, parameter I0 set, open stop control circuit to wait. If the graph is shown 1 times,the hardware of this system comprises block diagram. Nextpage LOGO! Choose those who take man-machine interface is basic model, the demand that estimates an input, imitate to measure output according to 3 imitate configures corresponding module. LO2GO! For systematic core, stop signal of logistic control, control to input output and the implementation that control algorithm with Yu Qi. The carry linage such as the rotate speed that its man-machine interface can use an input to control electric current of parameter K, indication input and electromotor is occupied. Transducer chooses MM440 transducer, specific type asks to decide according to the electromotor power of the machine that note model. Its action is with adjusting according to rotate speed of electromotor of control of input electric current electromotor outputs power. MM440 imitate inputs the limits that controls signal voltage U to ask to be 0 ～ 10 V, and LOGO! Imitate quantity outputs voltage limits to just also be 10 V of 0 ～ , both matchs completely. 2 I /U alternate the action of circuit is to use sampling resistor respectively, it is IL and IY change voltage, undertake enlarge, get LOGO! The voltage of limits of 0 ～ 10 V that imitate quantity input asks sends LOGO! . I0 set circuit is used at set to control parameter I0, the fraction that parameter I0 constitutes through potentiometer presses circuit to be taken out send LOGO! , facilitate adjust. Systematic work process shows LOGO 2 times like the graph! Control description of program flow chart. The corresponding program that implements control algorithm is shown 3 times like the graph. 3 last words the LOGO Xi Menzi company! After introducing with MM440 transducer in system of control of the engine that note model, raised systematic dependability, improved systematic stability. To the machine noting model of different type and different power, section report effect is distinct, noise also can be reduced greatly. CNC Milling CNC Machining