On May 27, 2012, at 10:50 PM, Jon Elson wrote:
> And, I'm not sure you can get this a whole lot better. If the G320 is
> responding to electrical
> noise on the encoder inputs, no amount of PID tuning will fix it.
And encoder noise it was indeed.
I just realized my motor wasn't grounded (you
Jeshua Lacock wrote:
> I captured a big spike event (16 encoder counts!), but for the life of me, I
> cannot figure which came first (the seem to be at the same instant?). I have
> two screen captures online, 1 so you can see the whole event and the second
> zoomed in as far as possible at the b
gene heskett wrote:
>
> Jon, while the encoder I built for the lathe spindle was pretty crude, one
> of the things I did in my research was to make it an given that the opto
> device chosen had an active, high speed CMOS rail to rail output. While
> the qradrature may not have been accurate eno
Kirk Wallace wrote:
> This is getting messy. I made a first attempt at a schematic of a single
> encoder setup. It should be attached. Also, the Inkscape SVG file is
> attached if someone wants to edit it. There are some missing bits, such
> as, how each component gets powered and grounded. I assum
On May 27, 2012, at 11:21 AM, Kirk Wallace wrote:
> On Sat, 2012-05-26 at 23:31 -0500, Jon Elson wrote:
> ... snip
>> Jeshua's AMT-103 encoder has a 2 mA source/sink driver when used by
>> itself (without
>> the line driver cable option). So, you can't apply too much of a
>> pull-down or it wi
On May 27, 2012, at 10:12 AM, Jon Elson wrote:
> Jeshua Lacock wrote:
>>
>> Then, just to see what might happen, I cut the encoder ground connected to
>> the encoder shield, and it looks like (preliminary speaking) it no longer
>> faults out.
> This seems to indicate that the encoder shield wa
On May 27, 2012, at 7:39 AM, Jan de Kruyf wrote:
> That is a bit of a difficult configuration. I rather like to us
> encoders with a RS485 balanced pair output i.e. A, notA, B, notB, etc.
> The receivers reject noise much better in htat configuration.
I actually wired up a differential encoder/d
On May 27, 2012, at 5:30 AM, andy pugh wrote:
> On 27 May 2012 05:16, Jeshua Lacock wrote:
>
>
>> The drive is dithering at 0.0003 - 0.0006 with the worst spike now at 0.0012.
> ...
>> One encoder pulse is 0.0003 on this axis. Would tuning the PID help with the
>> "spikes"
>
> You could cons
On Sunday, May 27, 2012 04:11:18 PM Dave Caroline did opine:
> On Sun, May 27, 2012 at 6:45 PM, andy pugh wrote:
> > On 27 May 2012 17:59, John Thornton wrote:
> >> I did manage to get two traces last night with a kick start from your
> >> instructions and lots of help from the IRC
> >
> > One
On Sun, 2012-05-27 at 19:07 +0100, andy pugh wrote:
> On 27 May 2012 18:48, Kirk Wallace wrote:
>
> >> > https://picasaweb.google.com/lh/photo/NivmHU8OuXIcP2EQHUPruNMTjNZETYmyPJy0liipFm0?feat=directlink
>
> > Your cabinet looks a lot better than mine, but... I have a thing about
> > Zip-ties.
>
Here is an article about effective EMI screening for those interested in
the subject.
http://www.ce-mag.com/99ARG/Bjorklof137.html
j.
On Sun, May 27, 2012 at 10:09 PM, gene heskett wrote:
> On Sunday, May 27, 2012 04:06:25 PM andy pugh did opine:
>
> > On 27 May 2012 18:48, Kirk Wallace wr
On Sunday, May 27, 2012 04:06:25 PM andy pugh did opine:
> On 27 May 2012 18:48, Kirk Wallace wrote:
> >> > https://picasaweb.google.com/lh/photo/NivmHU8OuXIcP2EQHUPruNMTjNZET
> >> > YmyPJy0liipFm0?feat=directlink
> >
> > Your cabinet looks a lot better than mine, but... I have a thing about
> >
On Sunday, May 27, 2012 03:40:41 PM Jon Elson did opine:
> Jeshua Lacock wrote:
> > Then, just to see what might happen, I cut the encoder ground
> > connected to the encoder shield, and it looks like (preliminary
> > speaking) it no longer faults out.
>
> This seems to indicate that the encoder
On Sun, May 27, 2012 at 2:07 PM, andy pugh wrote:
> Zip ties! How very dare you! That's harness lacing, that is.
>
> --
>
That looks nice. I used to have a roll of the waxed lacing, but I could
never talk myself into using it. I like it better than zip ties unless I
have to take something apart
>Zip ties! How very dare you! That's harness lacing, that is.
Oh dear, did you catch that affliction in your seafaring days, did you,
Andy?
j.
On Sun, May 27, 2012 at 8:07 PM, andy pugh wrote:
> On 27 May 2012 18:48, Kirk Wallace wrote:
>
> >> >
> https://picasaweb.google.com/lh/photo/NivmH
On Sun, May 27, 2012 at 6:45 PM, andy pugh wrote:
> On 27 May 2012 17:59, John Thornton wrote:
>> I did manage to get two traces last night with a kick start from your
>> instructions and lots of help from the IRC
>
> One thing that occurred to me is that phase balance on the drive-side
> of the
On 27 May 2012 18:48, Kirk Wallace wrote:
>> > https://picasaweb.google.com/lh/photo/NivmHU8OuXIcP2EQHUPruNMTjNZETYmyPJy0liipFm0?feat=directlink
> Your cabinet looks a lot better than mine, but... I have a thing about
> Zip-ties.
Zip ties! How very dare you! That's harness lacing, that is.
--
On Sat, 2012-05-26 at 22:16 -0600, Jeshua Lacock wrote:
... snip
> > You can sort-of see that I did that with my power and step/dir lines
> > in this cabinet:
> > https://picasaweb.google.com/lh/photo/NivmHU8OuXIcP2EQHUPruNMTjNZETYmyPJy0liipFm0?feat=directlink
... snip
Your cabinet looks a lot bet
On 27 May 2012 17:59, John Thornton wrote:
> I did manage to get two traces last night with a kick start from your
> instructions and lots of help from the IRC
One thing that occurred to me is that phase balance on the drive-side
of the reactor is possibly more important than phase-balance on the
On 5/27/2012 12:59 PM, John Thornton wrote:
> I did manage to get two traces last night with a kick start from your
> instructions and lots of help from the IRC. At the end I figured out the
> two circuits I was monitoring was the same phase. I do feel that I can
> get a good trace now thanks to al
On 5/27/2012 9:34 AM, Dave Caroline wrote:
> In preparation for any work I thought, we need to get a call tree or flow
> chart.
>
> A bit of googling and I found f77_diagram.
> A bit of hacking and I have it outputting html with links to other
> html including links to
> the flow charts.
>
> http:
I did manage to get two traces last night with a kick start from your
instructions and lots of help from the IRC. At the end I figured out the
two circuits I was monitoring was the same phase. I do feel that I can
get a good trace now thanks to all of you guys help.
Thanks
John
On 5/26/2012 10
Jeshua Lacock wrote:
>
> Then, just to see what might happen, I cut the encoder ground connected to
> the encoder shield, and it looks like (preliminary speaking) it no longer
> faults out.
This seems to indicate that the encoder shield was grounded to the wrong
place. So, noise
coupled to this
That is a bit of a difficult configuration. I rather like to us
encoders with a RS485 balanced pair output i.e. A, notA, B, notB, etc.
The receivers reject noise much better in htat configuration.
You might try to find a powder iron or ceramic ring-core and loop all
encoder wires through a few tim
In preparation for any work I thought, we need to get a call tree or flow chart.
A bit of googling and I found f77_diagram.
A bit of hacking and I have it outputting html with links to other
html including links to
the flow charts.
http://www.archivist.info/apt/aptos/apt360/orig_source/apt/ACNTRL
On 27 May 2012 05:16, Jeshua Lacock wrote:
> The drive is dithering at 0.0003 - 0.0006 with the worst spike now at 0.0012.
...
> One encoder pulse is 0.0003 on this axis. Would tuning the PID help with the
> "spikes"
You could consider setting the PID deadband to 1 or 2 encoder counts
if you d
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