See page 72 of manual for breaking resistor config.
Scott
On Tuesday, August 18, 2020, 12:17:35 PM CDT, jrmitchellj
<jrmitche...@gmail.com> wrote:
Hi Scott.
I have a Yaskawa V1000 on my spindle, and have installed a encoder on the
spindle.
Would you share what settings in the V1000 to get rigid tapping working
well? I have braking resistors installed, but don't know what variable to
change to bring them into play.
Any help & tips always welcome!
--J. Ray Mitchell Jr.
jrmitche...@gmail.com
"Good enough is the enemy of excellence"author unknown
On Tue, Jul 21, 2020 at 3:43 PM Scott Harwell via Emc-users <
emc-users@lists.sourceforge.net> wrote:
> Just got my new Control Engineering in the mail and saw this."Top 5 VFD
> parameter changes explained"
>
> |
> |
> |
> | | |
>
> |
>
> |
> |
> | |
> Top 5 VFD parameter changes explained
>
> Chris Vavra
>
> Learning Objectives Setting five parameters can take care of most VFD
> programming. Consider VFD control met...
> |
>
> |
>
> |
>
>
> "www.controleng.com/articles/top-5-vfd-parameter-changes-explained/"
> It may help.
> Scott
>
> On Tuesday, July 21, 2020, 12:17:05 PM CDT, Matthew Herd <
> herd.m...@gmail.com> wrote:
>
> Hi Rob,
>
> Thanks for the insights. I suspected something along these lines, even if
> I might have other problems with noise. I can confirm, the spindle stops
> way too slowly and definitely more than 10 revolutions pass before
> stopping. Long story short, I can’t readily run the machine in back gear
> and the slowest I can go at 60Hz is 560 RPM without backgear. I’ll play a
> bit more with how quickly I can stop the spindle with a braking resistor or
> I’ll attempt to get the HAL file to engage the mechanical brake to help
> transition faster. Nonetheless, 10 revolutions seems fairly ambitious
> based on my best guess of how long it might take to stop the spindle even
> with a braking resistor. That’s about 1 second, but should be
> achievable. Currently the VFD is configured based on the fastest stop time
> for max RPM, and there doesn’t seem to be a way to decrease stop time for
> different inertial loads (i.e. lower gear ratios/spindle speeds). However,
> I understand that the braking resistor should decrease stop time by
> approximately an order of magnitude based on some reading I did yesterday.
>
> Thanks!
> Matt
>
> > On Jul 21, 2020, at 1:00 PM, Robert Ellenberg <rwe...@gmail.com> wrote:
> >
> > Based on the videos and your descriptions of the behavior, you may be
> > running into a TP issue I've seen (in simulation) with very sluggish
> > spindles or very high spindle speeds. Here's what I think is going on:
> >
> > 1. The rigid tapping cycle allows a hard-coded 10 revolutions
> > <https://github.com/LinuxCNC/linuxcnc/blob/master/src/emc/tp/tc.c#L856>
> > of overtravel beyond the nominal bottom of the hole when reversing
> > direction.
> > 2. The spindle starts reversing direction only after the Z axis has
> > reached the bottom, so the spindle has to be able to stop in 10
> revolutions
> > to stay within the budgeted overtravel.
> > 3. If the TP hits the end of the overtravel, it prematurely declares the
> > motion to be complete and stops following the spindle motion.
> >
> > Do you still see this behavior if you run the spindle slower? Your
> spindle
> > seems to take a long time to reverse, so at high speeds you may be
> hitting
> > this limit.
> >
> > Best,
> > Rob
> > <https://github.com/LinuxCNC/linuxcnc/blob/master/src/emc/tp/tc.c#L856>
> >
> > On Tue, Jul 21, 2020 at 11:18 AM Matthew Herd <herd.m...@gmail.com>
> wrote:
> >
> >> Ahh, so I do use limit switches and a homing routine. So it’s homing to
> >> the same position (plus or minus a few thousandths or so).
> >>
> >>> On Jul 21, 2020, at 11:07 AM, Jon Elson <el...@pico-systems.com>
> wrote:
> >>>
> >>> On 07/21/2020 04:20 AM, andy pugh wrote:
> >>>> On Tue, 21 Jul 2020 at 10:18, andy pugh <bodge...@gmail.com> wrote:
> >>>>
> >>>>> We are not looking for noise, we are looking for spurious encoder
> >> count resets.
> >>>> But, thinking further, even if there _is_ noise on the index line, the
> >>>> encoder counter should ignore it. It ignores all the _real_ indexes
> >>>> unless index-enable is set true in HAL.
> >>>>
> >>> Yes, the only thing I can think of is he's hitting his soft limits.
> Over
> >> time, starting and stopping LinuxCNC,
> >>> without homing, the machine limits will drift. If you have rational
> >> limits in the .ini file, you will eventually reach the end of them and
> have
> >> really strange behavior. it can be fixed by homing in a safe position,
> >>> but best to put in home switches and actually home the machine to a
> >> repeatable position every time.
> >>>
> >>> Jon
> >>>
> >>>
> >>> _______________________________________________
> >>> Emc-users mailing list
> >>> Emc-users@lists.sourceforge.net
> >>> https://lists.sourceforge.net/lists/listinfo/emc-users
> >>
> >>
> >>
> >> _______________________________________________
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> >>
> >
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>
>
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