> > About the purchase, I would love to have the converter ready to use but > shipping cost to Argentina and taxes for something that little would be > ridiculously high. I see if I can find some arduino or PIC module ready to > use here, if not I'll have to make my own. > I meant, something that little it's not worth the shipping and taxes unless I use a cheap shipping method which will take a month to arrive. But sadly I need this thing to start working next week.
El sáb, 2 abr 2022 a las 0:37, Leonardo Marsaglia (<ldmarsag...@gmail.com>) escribió: > I found a firmware file on the mesa website that traded the 6th >> stepgen for a pwm. You can get a module on ebay for about $12 that >> converts that to 0-10v. Just set mine up that way and it's working >> great.. > > > Hi Joel, > > Well, the one in the forum uses P1 for the PWM output so all the > stepgens are still available. > About the purchase, I would love to have the converter ready to use but > shipping cost to Argentina and taxes for something that little would be > ridiculously high. I see if I can find some arduino or PIC module ready to > use here, if not I'll have to make my own. > > Stay well! > > > > El vie, 1 abr 2022 a las 23:59, Joel Jacobs (<jj7...@gmail.com>) escribió: > >> I found a firmware file on the mesa website that traded the 6th >> stepgen for a pwm. You can get a module on ebay for about $12 that >> converts that to 0-10v. Just set mine up that way and it's working >> great.. >> Joel >> >> On Fri, Apr 1, 2022 at 1:03 PM gene heskett <ghesk...@shentel.net> wrote: >> > >> > On Friday, 1 April 2022 09:51:50 EDT Leonardo Marsaglia wrote: >> > > Hi guys, I hope you're all doing well >> > > >> > > Quick question to define a little issue I have. I purchased a VFD that >> > > I wrongly thought had a pulse train input for speed reference. Turns >> > > out that feature it's optional so I need an additional card to have >> > > it. By the way this Simphoenix E280/E580 VFD can reach more than 800 >> > > hz so it's a good candidate for high speed spindles (which is the main >> > > reason why I purchased it). >> > > >> > > So my question is: Is it that difficult to modify the firmware on the >> > > 7i95 to add at least 1 PWM generator so I can easily convert that to >> > > analog voltage? Because if not, I need to make a frequency to voltage >> > > converter which is a little trickier. I prefer the PWM option of >> > > course. >> > > >> > > Thanks as always for your help and knowledge :) >> > >> > Have you actually tried to feed a software PWM into the analogue input? >> > They are usually filtered well enough to do that by filtering to the >> > average of a fast PWM. I have a huan yang clone on my 6040 I did that >> > with for a couple months before I found we had an rs485 driver that >> > worked even better. You may need to buffer that 5volt p-p signal in a >> > transistor to bring the swing up to the 10 volts the vfd needs, but the >> > vfd also can supply 12 volts to do that with. You'll need two >> transistors >> > to keep from inverting the speed range, look up a long tailed invertor >> on >> > google. Better yet, a ttl input cmos output AND gate, will give you a >> > full rail to rail signal. Check the docs from the vfd, you may need to >> do >> > the same with the dir signal. Generally both the run and dir signals are >> > energized by pulling that input down to ground from its open circuit of >> > 10 volts. Or use a Mesa SpinX1. I'm using that on my sheldon to do the >> > reversal when rigid tapping in 1/4 turn at 100 spindle rpms. Response >> > speed if the vfd is tuned correctly, is not a problem. Generally, they >> > are not tuned "Out Of The Box". >> > >> > Take care and stay well Leonardo. >> > >> > Cheers, Gene Heskett. >> > -- >> > "There are four boxes to be used in defense of liberty: >> > soap, ballot, jury, and ammo. Please use in that order." >> > -Ed Howdershelt (Author, 1940) >> > If we desire respect for the law, we must first make the law >> respectable. >> > - Louis D. Brandeis >> > >> > >> > >> > >> > >> > _______________________________________________ >> > Emc-users mailing list >> > Emc-users@lists.sourceforge.net >> > https://lists.sourceforge.net/lists/listinfo/emc-users >> >> >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
