Re: [CAD_CAM_EDM_DRO] Re: G320 Position Error Fault

Shadi,

If any system does a sudden stop from high speed, it will lose position. Motor size is irrelevant. It's inertia. The motor must ramp down as commanded by the software.

If the escape key is hit with Mach3 that is "Stop" not "feedhold", Stop terminates script abruptly, no ramping. If Feedhold or Spacebar is hit, the servo ramps down to stop and will not lose steps.

Ron



shadi_salhab_78 <salhab@...> wrote:

Hi all,
I'am using 400 line count encoder lowering might help.
But Dan lowering acceleration rate won't help when sudden stop from
full speed.

Shadi

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Dan Mauch" <dmauch@...> wrote:
>
> One other thing you might try is to lower the acceleration rate.
> Dan Mauch
> economical 3D scanner software and kits
> low cost stepper and servo motors.
> cases for Gecko drives
> kits and assembled 3-4 axis drives
> www.camtronics-cnc.com
> www.seanet.com/~dmauch
> ----- Original Message -----
> From: caudlet
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Sent: Wednesday, July 04, 2007 12:48 PM
> Subject: [CAD_CAM_EDM_DRO] Re: G320 Position Error Fault
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "shadi_salhab_78" <salhab@>
> wrote:
> >
> > Hi all,
> > I have been tunning my G320 servo drive for a big Fanuc motor every
> > thing went perfect , I can jog smoothly accelerating and
decelerating
> > to full speed with out any Position Error Fault LED lights .
> > The Problem arise when sudden stop happen ( when stopping a G00
> > command by pressing ESC on the keyboard ) the Fault LED lights
> >
> > The 128-+ counts are too little to stop a big Inertia motor !
> >
> > The Damping Trimpot is at full scale , Gain and limit Trimpots
3/4 of
> > full .
> > I reduced the full speed (from Mach3)it helped solving the
problem but
> > not a very practical solution !
> > What should I do ? Is there any way to increase the 128-+ counts
> > error or eliminate it ?
> >
> > Thanks,
> > Shadi Salhab
> >
> What line count encoder are you using? By dropping to a lower line
> count you will fault at a greater following error. It will cost you
> resolution but with gearing and leadscrews the steps per are probably
> small increments anyway. There is no way to adjust the 128 count
> number in the existing 320/340
>
>
>
>
>
> [Non-text portions of this message have been removed]
>






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