Ruida RDC6445g, z axis problems

Hi

After I turn it on or restart my controller - head go reseting all axis, and then XY return to last origin, but z axis is always on 300mm (how to set so after reset is 0, or how manually reset Z)?
Also have red z axis head focusing sensor, and after I pres focusing on my controller - nothing happend, XYZ not move?
In settings I turned focusing ON and set 3mm offset!
Z axis normaly goes up or down by presing buttons on control board!

LP, chris

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