On Thursday 27 December 2018 22:20:35 Greg Bentzinger via Emc-users wrote:
> . > 7i77 – Trying to understand TB2 I have similar problems with a 7i76 being fed by a 5i25. > > Pin 1 – VFIELD – FIELD Power 8-32V > Pin 2 – VFIELD – FIELD Power 8-32V > Pin 3 – VFIELD – FIELD Power 8-32V > Pin 4 – VFIELD – FIELD Power 8-32V > Pin 5 – VIN – FIELD I/O Logic Power 8-32V > Pin 6, 7 – NC > Pin 8 – Ground – COMMON > > So – are pins 1-4 common to each other, not common and can be supplied > different voltages, common but redundant to allow for greater current > transfer. Everyone I have ask has given completely different and > conflicting answers. Since I have no idea what the encoder current > draw will be I will be supplying TB1 with its own 5V powersupply and > thus W1 will short the 2 pins on the right (farthest from the DB25) I > have a second 24V powersupply which I have wired to each pin 1-5 with > ground on pin 8. My notes show I did this wiring 12/3/17 and have yet > to actually power it up as have yet to obtain a clear definitive > answer as to if this is proper or a potential smoke machine. > > Greg i have powered it up but haven't loaded it yet, with a teeny 15 volt supply on th 7i76, which also feeds a buck regulator to feed a std BoB attached to the 5i25's p2. So that part seems to work, without generating any smoke. But questions remain about why so many field power inputs. Perhaps PCW can enlighten us on these points. Having broken my little mill by unscrewing a ball screw from its nut while trying to find enough x motion to build the i/o panel for a new control box to house the 7i76 and an extra BoB, I bought a gantry mill of the 60x40 size family, and it arrived yesterday afternoon. So my first job is to finish the assembly, but the bed is already assembled, and its north of 100lbs. So I've yet to rig the how to get it from the carton to the table it will live on. My back isn't up to that at its age. But I'll figure out something. Next is to adapt the parport cable, which is expecting to have mach3 for a driver, but its gonna find a software stepping LinuxCNC pushing signals up the cable. That ought to be a bit of editing of that machines .hal file at the max. But I intend to make 2 of these interface kits, after I bring the G0704 back to life, build another one just like it to drive this gantry at much higher speed capability since software stepping generally means <20 ipm, and the propaganda says 50 to 100 ipm. Since I can't find longer ball screws to fix the little HF mill, I guess its a source of motors etc for other projects. I've had it 15+ years and it has done stuff way beyond its job description, includeing lots of EDM so it doesn't owe me much. But I would like a better explanation of the field power terminals. I can answer that with an ohmmeter of course but Peters word s/b final. Have a happier and more prosperous New Year, everybody. 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-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
