I had a problem? with my V2XT where the z axis wouldn't home and it seemed to be overshooting.
In my ignorance and brazenness, I broke the encoder on Z axis.
I've since replaced the encoder with one that should have the same output (250 lines, TTL Quadrature).? There were some things I wasn't sure of (A leads B on CCW rotation, and index pulse direction) but I put a scope on Y axis and confirmed mine has the same shape and lead etc.? So, in theory I'm back to the place where the original failure occurred.
However, when I try to enable the drives, the Z axis immediately begins to travel down, and very soon throw a message "Z DAC underflow".? Note that this happens during Enable, not during homing.? I've captured the output of the encoder at this point and have attached a picture here.
Yellow is A, Blue is B and magenta is index.
I've confirmed continuity from encoder to the AXSBOB for all lines.
Any idea what the problem could be and suggested next step?
Thanks for any guidance.
Will Grant
