inductive end stop intermittently triggered

dwak

I don't think I mentioned that the sensors themselves have an led indicator that lights when they are tripped and that the leds are not indicating being tripped but the dwc does if that makes sense. If I trip them manually they dwc shows a steady indication that they are tripped but when they are not activated the dwc shows random tripping of the sensors. I hope I'm explaining that well. The above video demonstrates what the dwc is indicating and when I go to home all the machine doesn't go to the endstops before thinking its homed.

oliof

@dwak in DWC 3.5.2 the background of the axis name turns green when the end stop is triggered.

Phaedrux

Is it possible your wiring is picking up interference?

dwak

@oliof

not sure which screen you are referring to but I have clicked through all the tabs and am not seeing that on any of the pages even with the A axis manually triggered. I am content with the add on for now as long as its not causing a problem.

dwak

@Phaedrux
that sounds like a logical possibility, the cables for the inductive sensors are shielded, but there is a short pigtail connecting them to 24v and gnd that is not shielded, I'll try to find a shielded cable to replace that pigtail or a ferrite and give it another go.

Phaedrux

@dwak said in inductive end stop intermittently triggered:

@oliof

not sure which screen you are referring to but I have clicked through all the tabs and am not seeing that on any of the pages even with the A axis manually triggered. I am content with the add on for now as long as its not causing a problem.

It's the main dashboard page where the X Y Z position is shown. When an endstop triggers the background of the X Y Z changes color.

dwak

@Phaedrux

does not change color for me

Phaedrux

Can you check your firmware and DWC versions?

dwak

@Phaedrux

Electronics
Diagnostics
Product Short Name Version
Duet 3 MB6XD MB6XD 3.5.2
Duet Software Framework DSF 3.5.2
Duet Web Control DWC 3.5.2

dwak

@dwak
added a shielded cable to power the endstops, no change
changed power supply out just as a poke in the dark, no change

dwak

@dwak
I noticed in the video that the z probe indicator alternates between 1000 and 0, not sure what exactly this number indicates but I assume that this is indicitive of the same problemRecording 2024-07-08 071616.mp4

dwak

update:
first the history.......when i started to get this duet set up I purchased an "identical" inductive sensor so i could mock up my machine before I committed to the change over. in the mock up the sensor worked perfectly so i proceeded with the install.

I just disconnected my z end stop and connected the new test sensor in its place, and it functioned properly. its not installed on the machine just hanging loose.

now I guess I need to figure out what that's telling me.

i guess as a next step i will replace one of the existing sensors with the new one and see what I get.
the cable runs on this machine are pretty long and i want to think that I could be getting some EMI, but the cables are shielded and they did work with the previous mach 3 controller, and the indicator lights on the sensors are fuctioning as expected ( led turns on when it approaches a metal object ) so I'm a little stumped. need a diode? why is the Z probe flashing in the dwc? (z probe is just a 3v supplied brass pad the tool touches off on)

any other suggestions would be appreciated.

thank you all for your time and expertise

Phaedrux

@dwak said in inductive end stop intermittently triggered:

z probe indicator alternates between 1000 and 0

The value of 0 to 1000 indicates the trigger status of the probe. So it's picking something up.

dwak

update:

i grounded the shielding on the offending cables and now I only have the issue with the y axis, so I have ordered some ferrites to see if i can eliminate the remaining noise.

dwak

Well got the endstops working on my own.
for anybody having similar issues,
I grounded the shielding on all the endstop and z probe cables and after ordering a trifield meter to test for efi, I moved the duet and pi to a more shielded location with some metal between them and the stepper motor transformers.

hope this helps someone in the future.
an aluminum, case for the duet would probably be a good idea,

Wonder if a 3d printed case from some ferromagnetic fillament would work for shielding.

the duet seems to be more sensitive to noise than my old controller was