On Tue, Jan 2, 2018 at 11:29 AM, Dave Cole <linuxcncro...@gmail.com> wrote:
> So what exactly do they do when the bus voltage rises during decel ?? Or > is there no decel control at all? > I've never seen a drive without braking circuitry and DC bus voltage > control. > > They do cut out when the bus voltage gets too high. I just expect there needs to be something to reduce the dc bus, and they don't have anything. The best theory I have seen is that these VFDs are built for continuous duty, and braking is not their main concern. The older ones had places to easily put braking components, some newer ones deleted that from the board. So you never know what you are going to get if you buy one now. I keep expecting a vendor to start selling ones with the braking circuits installed, all that is missing is a few cheap parts. But no joy on that. I'm hoping mine is one of the ones where you can add the parts, but probably not. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
