I'm at the end of my skill set. I built my own DIY CNC 5 years ago and it's been great. Lately I am getting false limit switch shutdowns. If I run the program with the router OFF there is no issue. With the router ON it get false limit trips. This tells me I have a NOISE issue. I am running Mach 3 and the debounce is set at 3000 which s HIGH. I have replaced all six limits and all wires are connected correctly. The wire is shielded and a separate drain wire connected in a standard star connection to GROUND. I did a Ohm test on the limit circuit and it is 1 ohm.

I'm at a loss as what kind of test I can do to figure out how to solve this issue.

Any ideas out there?????????
Steve in Maine