Z axis does not take the command below 0(zero)

I just finish up the build, I am using a Ramps14 , Marlin, Fusion 360, Repetier.
I created a small design with a pocket, for some reason the z axis does not want to dive into the material.
I am using a mechanical switches (all are open during the operation), I am sure it s a simple thing to fix but right now I cannot figure out.

no issue with the positive values.

Thank for help

There is a setting called “SOFTSTOP” or “SOFT_ENDSTOPS” in configuration.h. you should disable it for Z.

IIRC, there is also a way to turn it off with an M code.

Here it is:
http://marlinfw.org/docs/gcode/M211.html

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Thank you Jeff, It did work, learn something, now it’s turkey time.
Happy thanksgiving.
Again thank you, I really appreciated it.

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