开云体育

ctrl + shift + ? for shortcuts
© 2025 开云体育
  1. MachCNC
  2. Messages
Single Messages Topics Expanded Polls

Re: Electrical Noise

 

开云体育

Hi Dave,

I have a PMDX-126 which is optically isolated for inputs and the control outputs.? The Step/Dir are not under the assumption that most drives are.? In my case they are.

?

The problem has temporarily gone away again. No matter what I do, which includes twisting the stepper motor wire along the ESTOP and LIMIT switch wires, I can now home the Z without issue.

?

I'm still going to rewire the Z motor cable but it's a perplexing problem.

John

?

?

From: [email protected] [mailto:[email protected]] On Behalf Of dave via Groups.Io
Sent: January-29-20 6:00 AM
To: [email protected]
Subject: Re: [MachCNC] Electrical Noise

?

I've posted my solution to electrical noise on this forum a few times and no one has come back and said it did or didn't work for them, but when I had random missed steps? and spent a long time trying to find the fault... I fitted an Opto isolated BOB and I've never had a missed step since. Problem solved.

?

Dave

?

?

?

Sent from my Samsung Galaxy smartphone.

?

?

-------- Original message --------

From: John Dammeyer <johnd@...>

Date: 29/01/2020 12:55 am (GMT+00:00)

Subject: Re: [MachCNC] Electrical Noise

?

> chuck via Groups.Io
> have you tried the debounce input setting in general config? had a similar
> issue long time ago and debounce cured it. don't remember what I had to set
> it at but it worked.
> haven't used Mach3 for quite a while.
> Chuck

Just tried that.? And the problem with working on these types of issues is what I just ran into.? I set it to 10x40uS.? Quit. Restarted MACH3 and homed over a 4" distance.? No problem.? Perfect.? Moved the knee back up. Set the debounce back to 0.? Shut down.? Restarted MACH3 and homed again over a 4" distance.? No failure.? Now it won't fail.

Sigh.? I think I'll leave it at 5x40uS and see what happens while I fab up a new cable and connector that lets me deal with the shield better.

If all was working right (as in wrong)? it would fail repeatedly without a debounce but succeed with a debounce.? Then I could change wiring, add ferrites etc. and watch the problem vanish.? But no.? It's going to be stubborn.

John

>



Join [email protected] to automatically receive all group messages.