Have two probably trivial questions, however not so for me..

1)On my newly setup cnc my axes are moving fine, however for X axis my digital readout in Mach3 is showing negative values when my spindle is moving from left to right. meaning my 0 is at the most left edge of the table and instead of going to positive it goes into negative..
Ctrlr is Stb 5100, Motor Driver Tb6600. using laptop/usb.. Reversing in homing and limits does not help..

2) When ever my system gets into break mode whether bec of hitting the limit switch or emergency button or after a change of value of parameters in Mach3 when system flashes “Reset” the stepper motor at that time does not have the power and my heavy spindle drags the axis to the bottom. How can I somehow lock the z axis at these times so it does not slide down, becouse I have to re home it every single time after that.

Thanks!