On Saturday 19 December 2015 18:07:58 Gene Heskett wrote: > My google-fu seems unusable for this. > > The SSR's arrived this afternoon, and I need to figure out what sort > of an R to use as buildout as I think I will enable it with the same > 0-12 volt signal that enables the pwm servo amplifier I am using to > drive the spindle. > > They are rated 3-32 volts in, and <10 ma to fire. But I've no real > data on the opto from sparkfun that I am using to drive the pwm > servo's 12 volt enable. I've no clue how many mills it can actually > source. > > I will go see how many it can spare with a 1k load resistor though.
That turns out to be around 10.4 mills, but my testing found another problem with that idea, so apparently I must use a 2nd one, and find a pin to drive it, such that the power input is switched by the presence or lack thereof, of a charge pump signal at 500 hz from LCNC. Why? powered up, but LCNC is not running, the default outputs of the 5i25 are a logic one. So that enables the servo amp (and this SSR) even if it has no controlling signal, which in turn defeats the soft-start. And I've no clue 5 months later, if I have a spare pin on the first BoB. I do not believe I do without ripping out my ability to drive an A/B/C 4th axis. Fun & games, including finding a mounting place for both of them. Thanks all. 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
