On Wednesday 25 November 2015 10:35:32 Rick Lair wrote: > It's an "integrated" encoder, ( 2500 ppr incremental attached to the > end of the servo) here is the servo, > > http://www.automationdirect.com/adc/Shopping/Catalog/Motion_Control/Se >rvo_Systems/Medium_Inertia_(1KW_-_3KW)_Servo_Systems/3KW_Servo_System_( >Med_Inertia)/SVM-230 > > I just found the /A and /B were interchanged, ( the wires coming from > the drive are coming out of a 50 conductor cable, 28 AWG wire, with > the poorest color scheme possible to differentiate the wires, they > were RED/WHITE for the /A and WHITE/RED for the /B )
Good Grief Rick, what "genius" thought that was a good idea? I hope there is a difference in the stripe widths. > I have found though, I cannot see the index-enable signal doing > anything in halscope????? And I just triple checked those two little > bastards. Index enable is not usually the Z from the encoder. Look at it like its a cocking mechanism inside the P.I.D. And the halscope, with its limited sample rate in a servo based system with no base-thread, probably will not see it, so use a real scope, and it may need a pricy writing speed if not a wideband digital. On the analogue scope, it might be pretty dim. Gigahertz + digital, while it can be a bitch to setup the capture, makes it very easy to see. > No Z-/Z index signal could be an issue maybe in the grand scheme of > things???? To a 99.44%=absolute chance IMO. :) > Maybe a firmware issue? Or a docs issue. A 50 pin cable, it could get lost in. > Rick > > On 11/25/2015 10:07 AM, Gene Heskett wrote: > > On Wednesday 25 November 2015 08:59:45 Rick Lair wrote: > >> Here is a screenshot of what it looks like, after the machine has > >> homed itself, http://postimg.org/image/c8s8eqret/ look at the DTG > >> of the A axis, why does it look like this, and why would it take > >> off as soon as it homes itself, to some random position, like the > >> one shown, at MAX_VELOCITY? > > > > If thats a servo, what sort of an encoder? > > > > I run my cheap table with a stepper, so no encoder involved. If I > > do "home it", its to a level bubble laying on a jaw, but I use > > touchoff for that zero. Handy for establishing the roughly correct > > angles to turn a tool to for sharpening. That does not of course > > handle its backlash and I have no automatic facility to lock it down > > at any particular angle except the cheap brass thumbscrew, which is > > in fact incapable of holding it. > > > >> To me it is acting like a run away servo, but that makes no sense > >> to me, because after going over things multiple times and > >> physically checking the analog drive voltage and the servo drive > >> parameters again, I don't see how I can get a runaway. > >> > >> If I jog the table, in a positive rotation, I have a positive > >> command voltage going to the drive, I get a positive table rotation > >> physically and I get an upward counting DRO, > > > > Cheers, Gene Heskett 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> ------------------------------------------------------------------------------ Go from Idea to Many App Stores Faster with Intel(R) XDK Give your users amazing mobile app experiences with Intel(R) XDK. Use one codebase in this all-in-one HTML5 development environment. Design, debug & build mobile apps & 2D/3D high-impact games for multiple OSs. http://pubads.g.doubleclick.net/gampad/clk?id=254741551&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
