What follows is a long story about how the ground in a DC system moves
around.
This isn't the first time I've run into an issue on DC bus power systems.
Almost 10 years ago I was responsible for the electronics design and
software for this project.
http://www.autoartisans.com/rings/Barge1a.jpg
On 14 July 2018 at 09:01, Sven Wesley wrote:
> "GR80x80 Asto 24V von Dunkermotoren". My controller says 60 V on the data
> sign.
Those sound like they are probably brushed-DC servos.
http://store.mesanet.com/index.php?route=product/product=83_90_id=141
might work as the drives.
Or the Pico
I believe twisted cables are more immune to externally induced interference.
The twists result in the noise canceled out at the receiving ends.
John
>
> Yes of course this is true. But it is true if the wires are twisted 1, 4
> or 16 times per inch. Why does twist help?
>
> OK I just
For reducing interference DC grounds are often connected to the metal
cabinet with capacitors. The path of HF noise is often not what you think
compared to DC. Sometimes also done with, as you suggest, a high value
resistor in parallel with a capacitor.
But I agree. Following the rules is
On Sat, Jul 14, 2018 at 1:14 PM Gene Heskett wrote:
>
> Nope, and any current flowing out is matched by a current coming back,
> and when they add at a distance, they are essentially canceling because
> one matches the other but has an opposite sign.
>
Yes of course this is true. But it is
On Saturday 14 July 2018 14:40:24 Chris Albertson wrote:
> On Sat, Jul 14, 2018 at 10:26 AM Gene Heskett
wrote:
> > On Saturday 14 July 2018 11:57:10 Jon Elson wrote:
> >
> > Preferably as a twisted pair so the radiation of noise largely
> > cancels at 2x the twist rate distance or more. A
First off many people can use different Linux distributions with no issues.
If you have different experience then likely it is because of something
you have done different from most others
My first guess is that if C++ code you wrote causes a problem at the system
level then likely, maybe you
>From a safety point of view. It is best to follow rules from local safety
labs be it in the US or EU. Basically if you have a metal cabinet with AC
power inside The cabinet MUST be grounded to the earth pin on the power
socket and there are rules about using a dedicated screw (not used for
hi
interesting about operating system to where plug in different thing like
linuxcnc
plug in as good as system which it use.
i use ubuntu 16.04. very good. very easy to get to internet. what else need?
only after i load code block ( c++ programming) instantly "Ubuntu software"
stop working - does
On Sat, Jul 14, 2018 at 10:26 AM Gene Heskett wrote:
> On Saturday 14 July 2018 11:57:10 Jon Elson wrote:
>
> Preferably as a twisted pair so the radiation of noise largely cancels at
> 2x the twist rate distance or more. A tight twist = less radiated noise.
>
No doubt twisting helps, but I
The power supply cabinet I'm putting together for my Mill has a terminal
strip with ground and 105VDC power (1500W) with one pair of terminals for
each axis. From that strip I run one pair to each Servo Drive. From each
Servo Drive a pair to the motor. The encoder cables enter the Servo Drives
On Saturday 14 July 2018 11:57:10 Jon Elson wrote:
> On 07/14/2018 02:37 AM, Gene Heskett wrote:
> > Not exactly 100% correct John. High frequencies are
> > generally carried only by current flow at the skin of a
> > conductor. And the large conductor, while having some rise
> > in impedance, is
On 07/14/2018 02:37 AM, Gene Heskett wrote:
Not exactly 100% correct John. High frequencies are
generally carried only by current flow at the skin of a
conductor. And the large conductor, while having some rise
in impedance, is still the better conductor because the
smaller wire has far less
On Saturday 14 July 2018 09:13:12 TJoseph Powderly wrote:
> I've seen roller racks before but this is circular.
>
> something says to me "Bridgeport belt replacer"
>
> other voices says "hmm, weak force transfer"
>
> but a beautiful disk and interesting programming problem
>
> TomP
>
>
>
I've seen roller racks before but this is circular.
something says to me "Bridgeport belt replacer"
other voices says "hmm, weak force transfer"
but a beautiful disk and interesting programming problem
TomP
https://www.youtube.com/watch?v=-9gQ1KRhesM
Thanks Peter and Andy for your input.
I don't put much trust in the internal hardware, no documentation what so
ever except for the spindle VFD. There is a retrofitted machine on eBay,
but too many differences. The servos looks the same and is specified as
"GR80x80 Asto 24V von Dunkermotoren". My
On Saturday 14 July 2018 03:13:49 John Dammeyer wrote:
> > > > That's pretty much standard these days.
> > >
> > > I don't understand the desire to connect two lines together
> > > because they 'seem' to be of the same magnitude. 0VDC is Not
> > > equal to Gnd Many systems will have multiple 5V
On Saturday 14 July 2018 01:22:12 Chris Albertson wrote:
> On Fri, Jul 13, 2018 at 9:25 AM Roland Jollivet
>
>
> wrote:
> > > That's pretty much standard these days.
> >
> > I don't understand the desire to connect two lines together because
> > they 'seem' to be of the same magnitude. 0VDC is
> > > That's pretty much standard these days.
> >
> > I don't understand the desire to connect two lines together because they
> > 'seem' to be of the same magnitude. 0VDC is Not equal to Gnd
> > Many systems will have multiple 5V power lines, heavy, light, designated.
> > Do you want to link
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