Centroid Community CNC Support Forum

As subject says, limit switches are tripping during machine operation when it's no where near a limit. Not sure where to look. Thinking this could be noise of some sort?

I’ve searched to no avail.. is there a way to restart the program after this happens? What I’ve been doing is going back to cad/cam and changing program to pickup where it left off..

What kind of limit switches? Mechanical ones can be triggered by vibration, proximity and optical switches can be triggered by chips.

More likely it's due to noise. Are the limit switch cables properly shielded and routed away from power cables?

The limit cancels the program but the line number it stopped on is right there on the display. F4 run/F2 search, and enter a line number a few lines before where it stopped. Cycle start will then start the program at that line.

I had a guy tell me that his proximity switchs would trip from his dust collector not being grounded. I can't say for sure if it's possible or not since it wasn't my machine. Just putting it out there though.

Dan

tblough wrote: ↑Sun Jan 27, 2019 8:38 pm What kind of limit switches? Mechanical ones can be triggered by vibration, proximity and optical switches can be triggered by chips.

More likely it's due to noise. Are the limit switch cables properly shielded and routed away from power cables?

The limit cancels the program but the line number it stopped on is right there on the display. F4 run/F2 search, and enter a line number a few lines before where it stopped. Cycle start will then start the program at that line.

Dan,

Thank you for the reply! They are Omron (I'm guessing Chinese knockoff) inductive switches. No chips. I'm thinking rapid movement could be causing it.. If so, not sure what to do about that. I'm noticing it happen when I'm cutting circle pockets. I slowed down the toolpath and it seems to be better. The wiring for the limit switches is what came from the factory. I'm thinking I need to replace it. I'm not sure what to buy for that wire. I'm pretty confident it isn't caused by anything dust collection related. It's isolated, completely.

fix the trip problem first and if you want to start up in the middle of a part program....

f4 Run, F2 search and type in the line of g code you want to restart at.

Keith, the trip clears immediately.

slodat wrote: ↑Sun Jan 27, 2019 9:01 pm Keith, the trip clears immediately.

hello.
what type of switches are being used? link to them? and how are they wired?
please post screen shots of wizard i/o map settings
and a fresh report.zip

Omron TL-05MC1-Z Switches. One wired to each input 1, 2, 3 for home/limit.

It has tripped four times thus far in the job in the attached photo. I’m cutting delrin.

I’ll post a report and screenshot of config when job is done.

Thank you!

Your dust collection hose does NOT seem to be isolated from the cnc frame. This time of year dust collection induced static is ALWAYS on the "usual suspect" list.


Look this over: https://youtu.be/zKzjhp-yDkE

Thanks for the info in the video. I meant the electronics in the cnc machine are isolated from my dust collection plc via an interposing relay.

It’s not acting like static. No other indications of static. And, this has happened since I got it running last year. It’s random best I can tell this far..