If you have no braking resistor, or try to stop too fast for the resitor in use as the DC bus get pumped up to its maximum then the drive should fault and no longer control the motor. If the motor is allowed to just coast it will no longer pump up the bus.
There are some cases where what I said is not completely true and that would be for some kind of permanent magnet ac motor running above its base speed (field weakening mode) when even if the motor is coasting the back EMF would then go too high. But these special cases dont apply for our simple case. With an induction motor once the ac voltage is removed the field will quickly decay. John Figie On Jan 2, 2018 10:28 AM, "Dave Cole" <[email protected]> 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. > > Dave > > On 1/2/2018 11:07 AM, John Figie wrote: > >> That would be a poor design if no braking resistor causes it to blow up. >> Once the bus gets pushed up to its max limit it should let the motor coast >> to a stop. >> >> John Figie >> >> On Jan 2, 2018 9:58 AM, "Eric Keller" <[email protected]> wrote: >> >> On Tue, Jan 2, 2018 at 10:46 AM, Les Newell <[email protected]> >>> wrote: >>> >>> I would avoid the Huanyang drives as they have a reputation for blowing >>>> up. >>>> >>>> Les >>>> >>>> >>>> >>>> My thought is they probably blow up because they have no braking >>> circuitry >>> installed, even internal to the drive. Unless it gets added. The gohz >>> seems >>> to be the same hardware/firmware just from a short scan of the manual. >>> Wonder if it has a braking circuit. >>> ------------------------------------------------------------ >>> ------------------ >>> 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 >>> [email protected] >>> https://lists.sourceforge.net/lists/listinfo/emc-users >>> >>> ------------------------------------------------------------ >> ------------------ >> 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 >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > ------------------------------------------------------------ > ------------------ > 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 > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
