On Wed, Apr 06, 2011 at 02:51:02PM +0100, andy pugh wrote: > On 6 April 2011 14:31, Igor Chudov <ichu...@gmail.com> wrote: > > normally people discharge caps through a resistor only. > > In that case, what would be the normal discharge time? Last time I did > the calculations it looked like a permanently-connected resistor > needed to be rated at several tens of watts to not melt during normal > running. > (1 s discharge = 100W, 10s, discharge 10W)
<$0.02> With the low value braking (dishcharge) resistor applied by the relay on estop or shutdown, I'd only fit a high value permanent bleed, with a view to shunting charge which can come back out of the dielectric after a brief complete discharge. I'd fit it on the terminals of one or more of the capacitors in a bank, to maintain protection in the event of rewiring which disconnects the braking resistor. Then a watt or two will do the job. </$0.02> Erik -- "The difference between theory and practice is much smaller in theory than in practice..." ------------------------------------------------------------------------------ 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
