> > 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
