On Tuesday 10 August 2021 08:41:46 John Figie wrote: > What you describe is one way to achieve functional safety, but many > modern drives now have functional safety built in so that power does > not have to be removed using a relay. This allows for faster restart > after a stop as the control electronics in the drive remains powers. > Also this allows the drive to incorporate more advanced stopping and > monitoring safety functions for the axis. > > John Figie
So far John, I have not found any of the new generation of stepper-servo's, the 3 phase in particular, and which I think are the next big thing in steppers, to have any method of recovery from a fault but a powerdown reset. If you know of any that have a reset input, in that stepper/servo category, please advise. If its tied to the generally unused enable input, IDK as its not been documented anyplace I've read. In my usage so far, I have used the FAULT output as an F2 reset, and that cycles ALL machine power since I switch ALL machine power with SSR's triggered from motion-enabled. The machine then has to be re-homed of course since the home for the faulted axis has been lost by the drivers own output stage disable. The reason I think these are the next big thing is the power efficiency. Output drive currant to the motor is scaled by the encoder error. So they use only enough power to move the load. I have designed and 3d printed, a 30/1 harmonic drive for small servos's, and have had one life testing on the kitchen counter, turning the A axis from my 6040 mill, at about .001 rpm to around 10 for nearly a month now. The drive is now well "broken in" as I've also had it running at about 10 rpm for short periods of time, and the 1 nm motor is at room temperature right now, zero detectable heating. Except for an idler to tension the drive belt, it is complete and ready to go back on my 6040. A normal stepper would be just short of burn your hand hot. That is power that doesn't spin the power meter and you get billed for. [...] 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
