The set of important parameter in transducer

1The chooses V/f type option of V/f type includes highest frequency, basic frequency and torsion type to wait. Highest frequency is transducer - the highest frequency that electromotor system can move. Because the highest frequency of transducer oneself is likely taller, when when electromotor concessional highest frequency is led under the highest frequency of transducer, answer to have set by electromotor and its laden requirement. Basic frequency is transducer undertakes boundary of constant power control and constant torsion pilot to electromotor, the rated report that should press electromotor decides voltage set. What torsion type points to is laden it is constant torsion load still change torsion is laden. The user pursues according to the V/f type in transducer operation instruction handbook and laden characteristic, select a kind of among them kind. The actual condition of electric machinery mixes our basis to ask actually, highest frequency set is 83.

4Hz, basic frequency set is labour frequency 50Hz. Laden type: 50Hz is constant torsion load below, 50~83.

4Hz is constant power load. 2.

2 how adjusting the torsion that start to adjust the torsion that start is to improve the low speed performance when transducer is started, the torsion that makes electric machinery is outputted can satisfy the requirement that production starts. In system of frequency control of asynchronous electric machinery, the control of torsion is more complex.

In low frequency paragraph, the influence that resists as a result of resistor, leakage of electricity nots allow oversight, if still maintain V/f to be constant, criterion magnetic flux will be reduced, reduced the output torsion of electric machinery then. For this, in low frequency paragraph should have proper compensation to voltage in order to promote torsion. But, the influence of leakage impedance is concerned with frequency not only, still concern with the size of electric machinery electric current, accurate compensation is very difficult. In recent years abroad was developed a few can transducer of proper motion compensatory, but what require calculation the amount is large, hardware, software is more sophisticated, because this is general,transducer all is undertaken by the user artificial set is compensated. Be aimed at the transducer that we use, set of torsion promotion quantity is compare between 1%~5% appropriate. 2.

3 how set adds, the moving equation of slowdown time electric machinery: In type: Tt is electromagnetism torsion; T1 depends on for Dw/dt of acceleration of laden torsion electric machinery quicken torsion (Tt, t1) , and transducer is in open, the frequency change in process of apply the brake is led criterion by user set. If J of electric machinery moment of inertia, electric machinery is laden,change is pressed beforehand the frequency change rate of set rises fast or when decelerate, appear likely quickly torsion is insufficient, cause electric machinery stall thereby, namely electric machinery rotate speed and transducer output frequency are not harmonious, had caused electric current or overvoltage thereby. Accordingly, need is added according to electric machinery moment of inertia and laden and reasonable set, slowdown time, make the frequency change ratio of transducer can change with electric machinery rotate speed rate is harmonious. Checking the method with this whether reasonable set is to press experience make choice of to add, slowdown time set. If had appeared to flow in the process that start, can lengthen appropriately quicken time; If had appeared to flow in process of apply the brake, extend slowdown time appropriately; On the other hand, add, slowdown time is unfavorable set is too long, time is too long produce the effect efficiency, open often especially, when apply the brake. We will quicken time set to be 15s, slowdown time set is 5s. 2.

4 frequency are crossed jump when electric machinery of asynchronous of drive of V/f pilot transducer, in certain frequency paragraph. The electric current of electric machinery, rotate speed can produce vibration, serious when the system cannot move, voltaic protection has appeared to make in accelerating a process even electric machinery cannot be started normally, carry gently in electric machinery or when rotational volume is minor more serious. Because of this flexible transducer all stock frequency is crossed jump function, the user can be nodded according to the frequency of systematic occurrence oscillation, on V/f curve the setting is crossed jump dot and cross jump bit of width. Can jump over these frequency automatically when electric machinery is quickened paragraph, make sure the system moves normally. 2.

5 overload rate install this setting to be used at transducer and electromotor overload protection. When the output of transducer electric current is more than overload to lead setting value and electromotor when the OL set with rated affirmatory electric current is worth, transducer is protected with turning over time limit character to undertake overload (OL) , the transducer when overload protects a movement stops to output. 2.

The inputs transducer parameter input of parameter of 6 electric machinery has a few in the project is electric machinery the input of basic parameter, the power that is like electric machinery, rated voltage, rated electric current, rated rotate speed, extremely number. The input of these parameter is very important, will affect the normal play of function of a few protection in transducer directly, must input correctly according to the actual parameter of electric machinery, use of transducer in order to ensure normally. The place on 3 epilogue put together is narrated, although manufacturer is mature when development, production transducer the need of the user, designed a variety of set that can choose for the user, protection and indication function. But how to develop these functions adequately, reasonable use transducer, still be the issue that the user needs to notice, the set value of a few projects still needs to fumble, so that use good transducer, produce the effect of its aborning adequately. CNC Milling