just a update guys.
I forgot to add it to my drawing but I have a big isolator switch of course
on the doors of the machine and the x axis servo has a ground wire.
I forgot to add them to the drawing and Gene mentioned it.
I will also switch the breaker on the shed board off so I have two forms
> I'll offer my recently purchased 6040 mill as prime evidence of paint
> pretty much destroying my ability to ground anything. And to complicate
> things even a Q TLO measure is prevented by ceramic bearings in the
> spindle which are an insulator. ...
Ceramic bearings might be there to
On Sunday 29 December 2019 13:32:09 John Dammeyer wrote:
> I use
>
> The standard symbols on my drawings to represent what a ground is.
> The nomenclature is so varied I believe the first decision should be
> how to describe what is what.
>
> For me the EARTH symbol is the green (Green/Yellow)
I use
The standard symbols on my drawings to represent what a ground is. The
nomenclature is so varied I believe the first decision should be how to
describe what is what.
For me the EARTH symbol is the green (Green/Yellow) wire that goes back to the
circuit breaker panel and from there
On Sun, 29 Dec 2019, andrew beck wrote:
Date: Sun, 29 Dec 2019 23:19:20 +1300
From: andrew beck
Reply-To: "Enhanced Machine Controller (EMC)"
To: "Enhanced Machine Controller (EMC)"
Subject: Re: [Emc-users] looking for advice on best wiring practices and
grounding on cnc mills
On Sunday 29 December 2019 05:37:36 andrew beck wrote:
> Hey everyone
>
> So just getting to the bottom of these emails and thanks so much for
> all the replies.
>
> There is much food for thought.
>
> If you missed it up in the emails here is the current plan for wiring
> the control panel.
>
>
On Sunday 29 December 2019 05:19:20 andrew beck wrote:
> Hey Andy
>
> I am just going through all the replies now.
>
> So what I think happened is I put like 300 volts possibly through the
> servo motor. Not just 24 volts. as I had a cheap chinese power
> supply that was floating and not tied
Hey everyone
So just getting to the bottom of these emails and thanks so much for all
the replies.
There is much food for thought.
If you missed it up in the emails here is the current plan for wiring the
control panel.
yuhai servo drive manual
Hey Gene
thanks for the reply.
I think I follow most of what you said there.
And my neutral and ground will only be tied back at the shed main
electrical box definitely.
I think the main problem I have is how the 24 volt powersupplies should be
wired and connected to frame ground.
I have sent
Hey Andy
I am just going through all the replies now.
So what I think happened is I put like 300 volts possibly through the servo
motor. Not just 24 volts. as I had a cheap chinese power supply that was
floating and not tied to ground. It was a big spark that jumped to the
steel and it blew
No. I am talking about voltage drops in cables used to power devices. It might
also be AC impedance is rather high at frequencies used for communication and
device use power in smaller or larger bursts.
Problem is there is voltage drop in cable used to power DC and/or AC but no or
to be exact
> On Thu, 26 Dec 2019 at 19:03, Chris Albertson
> wrote:
>
> > All the rules try to do the same thing, connect nuetral to ground ONLY
> > at the building service entrance
>
> Off-topic, but that isn't the only way to do it.
> https://en.wikipedia.org/wiki/Earthing_system
> Is an interesting
On Thu, 26 Dec 2019 at 19:03, Chris Albertson wrote:
> All the rules try to do the same thing, connect nuetral to ground ONLY
> at the building service entrance
Off-topic, but that isn't the only way to do it.
https://en.wikipedia.org/wiki/Earthing_system
Is an interesting read.
--
atp
"A
On Friday 27 December 2019 00:04:32 Chris Albertson wrote:
> I think you are confusing ground and neutral. Ground should never
> move off zero. But the neutral can be up to about 5 volts above
> ground.
>
Which is why, as a CET, I like to specify static ground, which on this
side of the
I think you are confusing ground and neutral. Ground should never
move off zero. But the neutral can be up to about 5 volts above
ground.
On Thu, Dec 26, 2019 at 2:26 PM N wrote:
>
> Current used to power device will cause some voltage drop in ground so grond
> potential at device will be
Current used to power device will cause some voltage drop in ground so grond
potential at device will be higher. Ground potential will also vary with power
used by device. This higher potential might cause a problem if there for
example is digital communicatin between devices.
> A ground loop
A ground loop is then a single device is connected to ground more than
once. A good example is a motor driver. It might in a "power"
input called "+" and "-" with the minus side grounded to the AC mains
ground or a chassis frame ground. The in addition there is a
logic level control
On Thursday 26 December 2019 01:49:40 andrew beck wrote:
> Hey guys.
>
> I have a bit of a story here and some questions.. I Have been seeing
> the emails coming through and there looks like there is a massive pool
> of knowledge here in the user list and the forum. So here it goes
> hopefully
> On 26 Dec 2019, at 06:49, andrew beck wrote:
>
> That meant that the brake actually had a lot more than 24 volts in
> it relative to machine earth(like 200v I am guessing, it was a big bang!)
That shouldn’t normally matter. I would be very surprised if the brake winging
insulation wasn’t
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