Re: [CAD_CAM_EDM_DRO] Re: G320 Position Error Fault

I have done the same as u. Controlling big fanuc servo with G320.

Try this, it might help:

1. reduce the acceleration.
2. reduce the max speed.
3. Try to change the gearing. Old machine use poor gearing ratio. Mine is
1:1.2.
Change it to 1:3 to 1:5 will certainly help.

Fortino

>From: R Rogers <rogersmach@...>
>Reply-To: CAD_CAM_EDM_DRO@yahoogroups.com
>To: CAD_CAM_EDM_DRO@yahoogroups.com
>Subject: Re: [CAD_CAM_EDM_DRO] Re: G320 Position Error Fault
>Date: Wed, 4 Jul 2007 22:13:15 -0700 (PDT)
>
>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]
> >
>
>
>
>
>
>
>[Non-text portions of this message have been removed]
>

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