Z-axis driving to negativ

Hi there,
Using my z-axis with no home function it happens that on power on the axis is somewhere but not at the physical zero position. This position ist default set to zero. Now it is not possible to drive down to negative values.
How can I solve this problem? presetting the z-position and then drive down to zero is not possible.
Best solution was to be able generally drive to “minus” position.
maybe changing the source code, but where and how?

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