Servo drives and VFDs are two different animals. VFDs are typically designed to spin "squirrel cage" induction motors (think standard 3 phase motors), where rotor slip is used to generate the magnetic field in the rotor. Servo drives are designed to spin synchronous AC motors/servo motors that typically have a magnet rotor. The rotor never slips out of phase with the field. And that is why servo drives/motors can be used as positioning systems. Some servo drives can be dumbed down to spin induction motors but there is little point in doing that since servo drives are typically much more expensive. Trying to mix servo drive and servo motor manufactures gets very tricky. You need to fully understand the motor and its specs and then you need to have a Servo drive that is adjustable and adaptable to that motor and encoder type. Many cheaper drives are designed to connect to one or two models of motors and that is it. This is not a good place to guess at anything.
Dave On 12/14/2014 3:56 AM, Marius Liebenberg wrote: > On 2014-12-14 09:24, a k wrote: >> Hi >> i use 5i20+ 7i33 >> i am interesting if i can use this ac motor drive >> http://www.anaheimautomation.com/products/ac/ac-drivers-controllers.php?tID=1176&pt=t&cID=385 > It would seem that those are normal VFD. A servo drive and a VFD are not > the same thing. If you want to drive a spindle then the VFD is good > enough but for servos you should use a matching servo drive. The servo > drive has a control loop that requires the encoder to be connected to > the drive itself. I have not tried to use VFD in a servo loop but I am > fairly sure that it will not work as well a servo drive but I might be > wrong about this. > >> and i will use PIN--ENAO -- to drive -motor drive (+/- 5 V DC) >> >> and signals from ac servo motor encoder directly connect to 7i33 board >> a, a-, b, b- >> ? >> thank you >> aram >> >> >> On Sat, Dec 13, 2014 at 10:39 PM, Marius Liebenberg <mar...@mastercut.co.za> >> wrote: >>> On 2014-12-14 07:12, a k wrote: >>>> hi >>>> board 7i33 has 50 pin connector - that controls 4 servomotor. >>>> each set of 12 pins -wires control control one servo drive/servomotor. >>>> here are the pins >>>> ENCA0-------------encoder A >>>> /ENCA0-----------encoder A- >>>> ENCB0------------encoder B >>>> /ENCB0------------encoder B- >>>> >>>> IDX0-------------------what type of signal is it--how it used ? >>>> /IDXO------------------what type of signal is it--how it used? >>> Aram, these are the differential inputs for the INDEX signal from the >>> quadrature encoder. You can use that in several ways but mostly it is >>> used when doing threading. There are other uses as well as I said. >>> >>>> ////////////////////////////////////////////////////////// >>>> reason--from servo motor encoder output signals -A,A-,B,B- ---and i can >>> see >>>> corresponding pins on 7i33 board. >>>> what is the relation between --IDX0, -IDXO with U,U-,V,V-,W,W-? >>>> //////////////////////// >>>> 7I33 board has pin VCC-- is this out put +/-5 V DC that drives motor >>> drive? >>>> ///////////////////// >>>> PIN --ENA0 -----from 7i33 --- what is function of this pin? >>> This is usually the servo drive enable signal. It could be wired in HAL >>> to machine-is-on or any other function that you choose. >>>> thank you >>>> aram >>>> >>> ------------------------------------------------------------------------------ >>>> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server >>>> from Actuate! Instantly Supercharge Your Business Reports and Dashboards >>>> with Interactivity, Sharing, Native Excel Exports, App Integration & more >>>> Get technology previously reserved for billion-dollar corporations, FREE >>>> >>> http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk >>>> _______________________________________________ >>>> Emc-users mailing list >>>> Emc-users@lists.sourceforge.net >>>> https://lists.sourceforge.net/lists/listinfo/emc-users >>>> >>> -- >>> >>> Regards /Groete >>> >>> Marius D. Liebenberg >>> +27 82 698 3251 >>> +27 12 743 6064 >>> QQ 1767394877 >>> >>> >>> >>> ------------------------------------------------------------------------------ >>> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server >>> from Actuate! Instantly Supercharge Your Business Reports and Dashboards >>> with Interactivity, Sharing, Native Excel Exports, App Integration & more >>> Get technology previously reserved for billion-dollar corporations, FREE >>> >>> http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk >>> _______________________________________________ >>> Emc-users mailing list >>> Emc-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/emc-users >>> >> ------------------------------------------------------------------------------ >> Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server >> from Actuate! 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