I'd like to see it. Please send links when you can. Dave
On 3/10/2015 2:29 PM, Leonardo Marsaglia wrote: > 2015-03-10 17:04 GMT-03:00 Dave Cole <linuxcncro...@gmail.com>: > >> I've used that drive before and I am sure it can do 0-10VDC. I'm not >> sure about +/- 10VDC with direction reversal. >> >> > Hello Dave. I'm pretty sure, watching the manuals that it has both options, > so I guess it will work. > > > >> I think I remember looking at the drive you used before do the >> positioning and I believe it was much more capable than the Powerflex 40 >> drive. >> >> > The one I used before was a C2000 from the Delta brand and indeed worked > perfectly. > > >> Didn't you use that other drive along with an encoder for full vector >> control?? Without an encoder the drive is guessing at where the motor >> rotor is. I think that positioning with sensorless vector drive will be >> very difficult unless >> > your positioning requirements are very loose. > I'm using an encoder coupled directly to the screw and the driver itself > receives the analog velocity command from LinuxCNC. It works excellent > considering I'm not closing the velocity loop inside the VFD, wich I would > like to do in the near future. > > This VFD that I'm going for now (the PowerFlex 40), is for a similar > application, in fact it's on the same machine. I need to turn the part a > certain amount of degrees. This is going to be achieved using an AC motor > driving a worm and gear reduction. The encoder will be coupled directly to > the worm, and since the gear has almost none backlash I'm going to use > timing pulleys to drive the shaft that turns the part. > > The only concern for me was if this drive was capable of +/- 10 volts. > > By the way, the machine is almost done, we've been working on this for > almost a year and a half, so I'll be happy to share with you guys some > videos and pictures of it! > > Thanks as always! --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
