See NEC comment, below Regards,
Ken On Sat, Oct 10, 2015 at 8:18 AM, Gene Heskett <[email protected]> wrote: > On Saturday 10 October 2015 05:58:16 andy pugh wrote: > > > On 10 October 2015 at 06:42, Gene Heskett <[email protected]> wrote: > > > In setting up to use a charge pump, needed to insulate an output > > > from the fact that a 5i25, when lcnc isn't running, sets all outputs > > > to inputs and pulls them high. > > > > I am still not convinced that a charge-pump is the only solution to > > this. > I did some experiments, changing the 5i25's gpio pin around, and the only > way to achieve the desired result of starting the vacuum cleaner only > when the flood coolant checkbox is checked was to use the charge-pump. > > The other, more direct methods all failed and turned on the vacuum when > lcnc was stopped, or was all powered down. > > > > More important, the loadrt line cannot contain either a count= or a > > > names= number-of-the-beast control mechanism, its a show stopper > > > syntax error. > > > > Why do you need more than one charge-pump signal? Surely the single > > pulsing io line can fan-out to all the hardware it controls either in > > HAL or in copper? > > In hal, using a bank of mux2's or and2's it can be done. In that event, > my question degenerates into which takes fewer cpu cycles, an and2, or a > mux2? > > > (Not that I see a good reason for charge_pump to be a singleton > > component, but it is explicitly created as one in the .comp file) > > That was what's puzzling. The charge-pump is a useful module, and making > it multi-instance would simplify the logic trail thru hal, making it > more readable to the next set of eyeballs that might have to try & > figure out just what the heck I was trying to do when the real problem > is the failed electrolytic caps in the detector network. > > I do not have a handy radio shack anymore, closed up a few months ago, so > I was forced to use what I had on hand, which was a bag of 47ufx35v > caps, a bag of 1n914 diodes, and a small resistor to dole out the charge > to the base of a TIP31 transistor, which in turn ran the coil of a 24 > volt DPDT icecube relay. > > The vac draws 6.5 amps running, so both sets of that relays contacts are > paralleled. I took a plastic duplex box and broke the link in the > duplex so that one of the duplex's sockets was hot full time, and one > was switched by the relay. A short run, the plug end of that 14 gauge is > plugged into one socket of a 4plex I put on the wall roughly behind the > mill. > > More of that same piece of what we'd call SJ cabling runs from the duplex > I'll screw to the wall beside that 4plex, over to the top of > the "furniture" I built for the computer, and the huge box with all the > mills drivers and psu's in it, to the socket the icecube is plugged into > currently mounted to the BoB boxes lid. > > The NEC illegality is that the white wire in this SJ cable is hot. Its > not supposed to be white because that is supposed to denote powerline > neutral on this side of the pond. > My understanding (I'm not an electrician, nor do I play one on TV) is that you can wrap red tape around a white wire (at both ends) so as to "convert" the wire to red. > > The green wire is the static ground, and I will, after checking the box > this BoB etc is in, might supply a static ground to the box. > > The box itself is made from a couple feet of double sided PCB material as > I didn't want to cut up what I have left of the sides of a wrecked ups > van. > > However, had I known that I was going to need room for the relays and 3 > of those switching buck regulators I bought a 5 pack of on fleabay for > less than $40 USD, and that amazon was going to renege on selling me a > small 24 volt switcher, I would have made the box bigger so I could have > hidden all this away from wandering fingers. That is not an unfixable > problem as I have about 40 feet of that material 6" wide, so I can make > a bigger box and transfer stuff. The control transformer that makes the > nominally 36 volts to feed all those sub regulators is the sole source > of obvious heat, that things core runs at 135F at zero load! Very > inefficient. I knew that, which is why I tried to buy a smallish > switcher from amazon. > > NEC legal on this side of the pond? Hell no, thats why it can be > unplugged. > > Even that 4plex is sick bird, its fed with around 6 feet of 10/3 right > from the service, which mandates a max breaker rating of 20 amps, and > sick bird to feed a regular duplex socket with, so you have to drill out > the plugin entrance holes in the back of the duplex, or half strip the > terminal screws which will not back out far enough to accept more than a > 14 gauge wire. > > But the breaker feeding it had to be jacked up to a 30 amp, else it > tripped on turning on the mills motor supplies with one switch. Actual > draw according to an amprobe is about 2.75 amps, but the capacitor > charging inrush of a kilowatt+ for spindle motor use tripped a 20 amp > breaker 100% of the time, and no breakers are locally available that > would absorb that, they are all magneticly tripped, cheap, and as > instant as they can be. > > That really should be a 15 amp breaker, with a couple cycles of thermal > time delay to trip. They can be ordered special, cost around $75, > whereas the 30 amp magnetic is less than a tenner, you can buy them in > carton lots of 10 for an even bigger discount. Obviously everyone knows > what will be used in actual practice. What Works(TM). > > Which is a huge sigh because the insurance people will use any excuse > they can find in the ashes to deny a claim... > > Gotta go make some morning plasma to get both eyes open simultainiously. > I' a quart low. > > Thanks Andy. > > 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) > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers > -- Kenneth Lerman 55 Main Street Newtown, CT 06470 ------------------------------------------------------------------------------ _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
