On Monday 18 April 2016 07:51:02 Gene Heskett wrote: > On Monday 18 April 2016 04:59:19 andy pugh wrote: > > On 18 April 2016 at 02:13, Gene Heskett <[email protected]> wrote: > > > Why in tuncket did they build a driver > > > that can't run on the 127 AC out of the wall? That does not make > > > any sort of business sense to me even after a 6 pack of suds. :( > > > > Most of the world uses 240V [ > > https://commons.wikimedia.org/wiki/File:Map-World-Subdivisions-Volta > >ge s-Frequencies-Eletricity.png ] > > 240 AC to 80 DC needs more expensive components, I guess. > > The MA860H is what they supply to run the 1841 oz/in nema 34 motor. > > It wants either 80 volts AC, or 110 volts DC at its input terminals. > Satisfying that is near impossible, I suspect on either side of the > ponds. The lower powered MA860 has no PSU built in, and can run at 80 > volts, but seems to be commonly mated to a puny 350 watter that makes > 60 volts at 5.85 amps. Thats not enough to run the 1841 oz motor at > full song as it needs 5 amps rms per phase. The 1600 oz there now has > around 23mh inductance whereas the 1841 oz is only 11mh. > > If, at that reduced current, it can still lift the head, it ought to > be able to do it at 60 ipm whereas the 1600 is out of torque and > stalling at about 48 ipm. > > Topped off by there not being adequate room in my electronics box to > add any more transformers good for 600+ watts even if they were > available. I've already added 2 more smaller boxes, one to hold the > SSR's that sequence the spindle power on/off so I am not tripping a 20 > amp breaker just by turning it on, and another box I made up out of > pcb to hold the 2nd breakout card, which at present has 2 functions, > one being a m8/m9 switch to start and stop a vacuum cleaner sucking up > the dust when I am carving wood, and if doing the box joint board > ends, a motor to flip the end of board gauge in and out with the M7/M9 > sequence. > Since timeing isn't critical, those 3 functions are on charge pump > detectors & my hal file "and2" gates the one charge pump loaded and > set to run full time to the appropriate pins. > > But I am tempted to just buy the motor, and see how much torque is > available to lift that head at whatever current, maybe 4 per phase > that the 350 watter can supply without doing any foldbacks or > shutdowns. > > Would that be feasible? Or a waste of time until I can cobble up an 80 > volt at 8 to 10 amp AC supply for the MA860H driver? Its increased > thickness would displace the 60 volt supply being used for the 1600 > oz/in now. > > I have one more big transformer, a toroid about a foot in diameter and > 7.5" thick, weighs around 80-85 lbs, intended as a 250/125 stepdown > isolation good for several KW. I suppose I could undress it and remove > secondary windings until it was down to 80 volts. Then I'd have to > make or locate a metal box to put it in per the NEC. It would make a > good foot stool once that was done. :) Classic Rube Goldberg and I > have too much of that already. :( > > Cheers, Gene Heskett
Update, Peter in a PM suggested a bigger STEPGEN_MAXACCEL, which I already had at 2x the MAX_ACCELERATION. So I wrote me some new rules, as follows: STEPGEN_MAXVEL = 1.5 that of MAXVEL STEPGEN_MAXACCEL = 3x MAX_ACCELERATION The g33.1 peck cycle is now running flawlessly at 1000 rpm at the spindle, which for a .7mm pitch tap means z is moving in the 21-22 ipm range, and seems able to do it forever without throwing an axis2 following error. Even the halscope waveforms look tolerable except for the wide open reset to original start position at the end of that G33.1 incantation. And since that z speed is about 55% of its stall speed, I think I'll slow to a near quit while I'm somewhat ahead. Tomorrow I may see if I can speed up the turn around, as 3.75 turns to stop from 1000 revs is noticeably slower than its capable of, as long as Z can keep up. So next, that gets cranked up until Z can't quite answer roll call. 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> ------------------------------------------------------------------------------ Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
