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Limit Switch Errors

Posted: Wed Mar 20, 2019 10:02 pm
by KLWestfall
i get the following codes sometimes while running. Sometimes by clearing the code will help, sometimes re-homing, and sometimes by turning it off and restarting. That sucks because then I have to start over...

Anyone know what causes or why I get it? I've blown out all limit switches, cleaned out the E-stop and out of ideas...


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Re: Limit Switch Errors

Posted: Thu Mar 21, 2019 7:10 pm
by 4DThinker
If you've had your machine awhile, the best solution is to replace the switches. Limit 0 is the X axis and those switches are on the ends of the gantry beam. I oversee three Probotix CNCs and my students have a tendency to jog the Z axis to the top before homing the machines which eventually bends/fatigues the Z switch until it can open up easily with vibration during a cut. The X axis on our Nebula is also finicky. Sometimes pulling off the cable ends and giving the switch terminals a quick scratch with steel wool will help, as will squeezing/crimping the connector a bit once in place. In some cases we've eventually just soldered the cables to the switches.

Let me know if any of the above helps.


Re: Limit Switch Errors

Posted: Fri Mar 22, 2019 9:45 am
by hemicro
Also check the grounding between machine and computer. If the ground is not very good, you can get some false switch readings.

Re: Limit Switch Errors

Posted: Fri Mar 22, 2019 11:49 pm
by KLWestfall
Thank you, I'll check those out. Appreciate the info.