On Wednesday, April 06, 2011 04:25:58 PM Igor Chudov did opine: > On Wed, Apr 6, 2011 at 3:14 PM, gene heskett <ghesk...@wdtv.com> wrote: > > On Wednesday, April 06, 2011 04:02:33 PM andy pugh did opine: > > > And now the cap sizing. > > > If I say that I can put up with 10% ripple at max rated current > > > (7.5A for the motors) on a nominal 300V then I end up with > > > C = 7.5A X 10mS / 30V = 2500uF. > > > > > > Eeek! > > > > Understatement Andy, it will weld relays closed with the inrush unless > > surge limited. And for 60hz power, your 10ms would be 8.33333333333 > > for a full wave bridge. > > Why, the relay is connecting the poles of the capacitor through a > resistor. > > It is current limited.
I was referring to the power on contacts, not the safety discharge ones. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) <http://tinyurl.com/ddg5bz> <http://www.cantrip.org/gatto.html> snappy repartee: What you'd say if you had another chance. ------------------------------------------------------------------------------ Xperia(TM) PLAY It's a major breakthrough. An authentic gaming smartphone on the nation's most reliable network. And it wants your games. http://p.sf.net/sfu/verizon-sfdev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
