Z axis keeps moving to top limit switch on burn start

Currently using a Yorahome Silverback 6060 with 40watt laser. When I set the z axis to the appropriate height above my material and start the burn, the z axis always moves to the top limit switch then starts to burn. Its then too high to burn. Is there a setting to stop it from moving up on start?

I notice in your profile it’s a grbl controller not Ruida…


Thanks. I changed it .


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