The problem is there are multiple of ways a PWM can be implemented for controlling a servo amp. Are the signals a single PWM, PWM/Dir, or PWM-up/down. The single PWM would have 50% duty be analogous to 0v. The PWM/Dir uses the dir pin to determine negative or positive. And the Up/Down uses two separate pins with a PWM signal one for positive and the other for negative. Plus you will need to figure out if the control or the drive/amp is handling the commutation. My guess is that the control is doing the commutation and the amp is basically 3 h-bridges and you are going to need sets of 3 PWMs (maybe just 2) for each amp with the PWMs commutated by a BLDC comp. Not that it can't be done, just that its a lot to figure out, especially if Heidenhain isn't very forthcoming with the pertinent engineering info.
Todd Zuercher P. Graham Dunn Inc. 630 Henry Street Dalton, Ohio 44618 Phone: (330)828-2105ext. 2031 -----Original Message----- From: andrew beck <[email protected]> Sent: Wednesday, June 24, 2020 2:48 PM To: Enhanced Machine Controller (EMC) <[email protected]> Subject: Re: [Emc-users] educate me on PWM for controlling servo drives [EXTERNAL EMAIL] Be sure links are safe. All it says is they use pwm for controlling via x72 x80 x82 etc. I forgot to what most buy as you say it doesn't matter really. I am more interested in how pwm works. As far as I know there is a voltage and duty cycle and a dir. But I haven't used it before. Regards Andrew On Thu, Jun 25, 2020, 12:51 AM andy pugh <[email protected]> wrote: > On Wed, 24 Jun 2020 at 13:45, andy pugh <[email protected]> wrote: > > > > On Wed, 24 Jun 2020 at 12:30, andrew beck <[email protected]> > wrote: > > > > > as some of you will know I am trying to connect to a heidenhain > inverter > > > unit on my cnc mill > > > > Which model? > > (Not that it matters, there seems to be no useful info in that > document) > > -- > atp > "A motorcycle is a bicycle with a pandemonium attachment and is > designed for the especial use of mechanical geniuses, daredevils and > lunatics." > — George Fitch, Atlanta Constitution Newspaper, 1912 > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
