Have been using my CNC Router for a few months now, no major problems until...
I grounded the frame of the machine to add a Touch Probe.
Right away the limit home switch start throwing false signals every few seconds.
I did several hours of reading here and testing and I am still confused.
Did have 3 limit switches wired series (normally closed) and shield grounded at controller
also 3 home switches wire Open and shielded. Changed these to use one input on the BOB for the probe.
Ended up trying all switches in one loop normally closed
As soon as I ground the machine, it false triggers within a few seconds.
So I tried wiring all the switches Normally Open, grounded the machine and everything works fine.
I really prefer having a closed loop switch system, and from what I read it sounds like most false triggers happen on a open loop system.
So why do I get the trigger on a closed loop?
I run two power supplies and the motor cables are long and un-shielded.
Just not understanding something here. I do have 1.36 volts between the machine and ground.
Thank you in advance, Keith