On 9 May 2018 at 00:00, andy pugh wrote:
> I will try that. I do have the ferrites on the 3 x 8i20 that run the
> other axes.
The latest on this is that I have re-assembled the machine in the
original configuration to begin trouble-shooting and the accursed
thing is working perfectly.
The only
On Tuesday 08 May 2018 18:58:53 andy pugh wrote:
> On 8 May 2018 at 14:27, John Kasunich wrote:
> > Which cables have a braided shield? The ones taking DC power from
> > the power supply to the drives?
> >
> > There's nothing magic about those cables - replace them with two
> > suitably sized si
gh [mailto:bodge...@gmail.com]
> Sent: May-08-18 4:14 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Ferrite on a shielded cable
>
> On 8 May 2018 at 19:52, Chris Albertson wrote:
>
> > But if using a second power supply helped then I doubt the fer
On 8 May 2018 at 19:52, Chris Albertson wrote:
> But if using a second power supply helped then I doubt the ferrite choke
> will fix the same problem. The problem was maybe in the write routing
> (were signal and power wires running parallel to each other?) or it was
> noise on the ground.
No,
On 8 May 2018 at 14:44, Peter C. Wallace wrote:
> At the frequencies involved, your entire "ground" is nothing but a big
> tapped autotransformer. For our experience with the 8I20 we found the
> simplest thing to do about EMI was to put a large ferrite bead over the 3
> motor U/V/W wires.
I will
On 8 May 2018 at 14:27, John Kasunich wrote:
> Which cables have a braided shield? The ones taking DC power from the power
> supply to the drives?
>
> There's nothing magic about those cables - replace them with two suitably
> sized single-core wires.
I know there is nothing magic, they are j
So you are asking if the shield will somehow shied out the effect of the
ferrite choke. Not. You can use both. The shield only shields the
electric field. The magnetic field goes right on through the coper braid
as if it was plastic. The ferrite choke works on magnetic field.
But if using a
On Tue, 8 May 2018, andy pugh wrote:
Date: Tue, 8 May 2018 12:20:53 +0100
From: andy pugh
Reply-To: "Enhanced Machine Controller (EMC)"
To: "Enhanced Machine Controller (EMC)"
Subject: [Emc-users] Ferrite on a shielded cable
I have concluded that I have a proble
On Tuesday 08 May 2018 08:06:37 andy pugh wrote:
> On 8 May 2018 at 12:53, Gene Heskett wrote:
> > Is there a possible violation of the single point ground? Some cable
> > shield grounded on both ends for instance?
>
> The internet says that that might be correct for 2.5Mb serial data.
For unbal
On Tue, May 8, 2018, at 7:27 AM, andy pugh wrote:
> On 8 May 2018 at 12:20, andy pugh wrote:
>
> > Should the shield pass through the choke, or should I strip the area
> > where the choke is installed?
>
> Googling for answers to the question I found this (crank?) web site:
> https://www.lesse
On Tue, May 8, 2018, at 7:20 AM, andy pugh wrote:
> I have concluded that I have a problem with noise from my (shared by 4
> drives) servo power supply.
> The STMBL drive controlling the 4th axis suffers from CRC errors with
> the smart-serial control signals and shuts down.
>
> By the simple ex
Andy,
if the shield of your cables is any good, there should be no electric
field outside of it (that's the purpose of coaxial shielding), thus, no
interference, so further measures like ferrite rings etc. are useless at
this point.
Your 4 servos draw current from the power supply. The common i
On 8 May 2018 at 12:53, Gene Heskett wrote:
> Is there a possible violation of the single point ground? Some cable
> shield grounded on both ends for instance?
The internet says that that might be correct for 2.5Mb serial data.
https://www.edn.com/electronics-blogs/the-emc-blog/4417778/Questions
On Tuesday 08 May 2018 07:27:31 andy pugh wrote:
> On 8 May 2018 at 12:20, andy pugh wrote:
> > Should the shield pass through the choke, or should I strip the area
> > where the choke is installed?
>
> Googling for answers to the question I found this (crank?) web site:
> https://www.lessemf.com
On Tuesday 08 May 2018 07:20:53 andy pugh wrote:
> I have concluded that I have a problem with noise from my (shared by 4
> drives) servo power supply.
> The STMBL drive controlling the 4th axis suffers from CRC errors with
> the smart-serial control signals and shuts down.
>
> By the simple exped
On 8 May 2018 at 12:20, andy pugh wrote:
> Should the shield pass through the choke, or should I strip the area
> where the choke is installed?
Googling for answers to the question I found this (crank?) web site:
https://www.lessemf.com/cellphon.html
Looking at their snap-on ferrrite bead I have
I have concluded that I have a problem with noise from my (shared by 4
drives) servo power supply.
The STMBL drive controlling the 4th axis suffers from CRC errors with
the smart-serial control signals and shuts down.
By the simple expedient of running it from a separate PSU this problem
seems to
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