To introducing servo driver or frequency conversion drive (the automation system of VFD) , a lot of clients do not understand among them the function of coder. A few clients think: If they offer congener and optimal coder, systematic precision is met certainly very tall. Sound it seems that very reasonable? Yes, still need to consider other nevertheless a few elements. The system that is based on coder has 3 commonly used term - resolution, precision, and repeatability. When judgement is based on coder function of the system, these 3 factors are very main, the real property of whole system depends on among them the weakest link. 1, resolution is the increment of the least place that automation system can detect. The resolution parameter of every coder is used commonly " Ppr " (the pulse that every turn is counted) will express. Below good position, coder should reach the biggest resolution as far as possible. 2, precision is right those who give an input is actual with the setting (be needed) the position / between speed the biggest expect poor cost. Below good position, the system should achieve the biggest precision as far as possible, the setting is worth and the value is needed between real value namely the smallest. 3, repeatability is athletic system come true with reliable means in be operated for many times " setting / be needed " positional ability. Below good position, the system should achieve the biggest repeatability as far as possible. Accordingly, although the user has the congener and optimal coder with highest resolution, and the congener and optimal driver with highest precision, cause systematic performance because of two following elements possibly also " cannot achieve groove " . 1, noise: The does not accord with even the line the standard electromagnetism compatibility criterion of coder and PLC or electronic driver (for instance a kind of more practical method is for coder two end provide even the clue proper screen) . This kind gets even the line very easily the influence of noise, perhaps appear to disturb pertinent question with electromagnetism. 2, installation: Coder did not undertake on electric machinery correct machinery is installed (join for instance not beautiful can bring about coder " frequency is bouncing " ) . This may bring about output repeatability is poorer. Morgan is based on Cole the coder that the servo electric machinery of coder contains former plant to assemble, so the user does not need completely to worry about its function. When installing machine coder or the coder that take system of inductive electric machinery nevertheless, must special discretion, go up in order to ensure through appropriate mechanism means installs coder in the machine, and the accords with even the line electromagnetism compatibility criterion requirement of electric driver or PLC. This is the best kind that allows your coder system to achieve optimum behavior. CNC MillingCNC Machining