On 01/06/2016 03:05 AM, Gene Heskett wrote: [snip] > The idea being that when that drain goes low, it will charge the .22, > thru the diode, essentially maintaining that charge state. But when > LCNC is stopped, that drain will go high (to 25 volts) as the supply is > turned off, and as it goes high, so will the far end of that .22, > carrying the + terminal on the third SSR far enough to trigger it. [snip]
That means you want to use the SSR to act as a bleeder, which is activated when the main power is shut off. This is a good idea, but the use of SSR is a problem. An SSR has a TRIAC or an SCR as switching element, which cannot be turned off. The device is in the on-state once a current flows until the current reaches under a holding threshold. This feature is no problem in AC systems, but is generally bad in DC systems. When you turn off the machine and the SSR starts to bleed, and then turn on the machine before the caps are completely empty, then you will have the bleeder load on there permanently. -- Greetings Bertho (disclaimers are disclaimed) ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
