On Sunday 13 December 2015 02:38:25 Erik Christiansen wrote: > On 12.12.15 21:32, Gene Heskett wrote: > > But I suspect that 90 volts (cap input filter) is still way too much > > for those coils over any time period in excess of 2 or 3 minutes. > > > > So, how much more do I need to reduce the coil voltage in order to > > run them at a reasonable temperature on DC? > > > > I have some other toroid trannies that might be more suited for this > > as I suspect the operation from DC can probably be reliably done > > with 30 volts w/o baking the coils. > > > > Does anyone else have similar experience who can toss a few words my > > way on this? > > They might hold on 30v, but I don't see them pulling in on it. If the > relay is switched well after power-up, then a resistor feed of DC to a > middle-sized electrolytic briefly provides full pull-in voltage via > whatever switches the coil current, and the resistor is scaled for > coolness, according to taste. (Well, finger-burn, actually.)
Noted also. :) The supply will be available as soon as the master switch is closed. The rest will be LCNC controlled. Cap choices currently in that drawer are both too many uf's, and likely not enough voltage. With the local rat shack gone, I have to get this stuff online. So projects that ought to be an hour or 3, turn into 10 or 20 day projects, which is frustrating to put it nicely. Ebay is out, and will be till late this week as I am having them nuke all my accounts so I can setup a new one that works. > Now, to "unsimplicate", if that is the builder's bent, there are > gadgets like: http://www.ti.com/lit/ds/symlink/drv120.pdf , located by > a quick google for "pwm solenoid relay driver". > > There are doubtless other ways to cook this cat, variously attractive, > depending on ingredients to hand. Which does have a lot to do with it, "when all you have is a hammer" etc etc. :) Season to taste. ;) > Thanks Erik > > ---------------------------------------------------------------------- >-------- _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Some mill pix are at: Genes Web page <http://geneslinuxbox.net:6309/gene/GO704-pix> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
