Z-Axis moving in same direction when jog Up or Down in Mech3 after PMDX-133

[craigthinks]

The Z-Axis on the CNC router moves in the same direction when jogging Up or Down using Mech3 software. Don't know how to correct the problem and if it is PMDX boards, gecko drivers, Mech3 software. I know it is not the motors and motor connection as I switched the Y-Axis and Z-Axis Green connectors on the PMDX-133 board and it operated the same on the Y-Axis.

Back ground:  overheated and pins on the PMDX and Terminal Blocks were burnt. Replace the PMDX-133 with a new board and replace the green phoenix contacts #1934900 with new ones. At first it worked then the Z-Axis stopped working. it only goes up for jogging Up or Down.

We also tried swapping out the Gecko G203V with a G201X board that we had on hand. still the same, so probably not the Gecko motor controller.
Anyone have a know what might be wrong? Maybe a Mech3 software issue, but not familiar with the software other than running it.
Thank you in advanced Craig, Dallas, TX
 

[Steve Stallings]

If you are saying that you tried the Z axis motor connected to the
output of the Y axis driver and the result was that the mechanical Z axis
was responding to Y commands, but still had the problem with movement
in only one direction, then I suspect a problem with your Z axis cable or
motor. When a stepper motor is getting current through only one of its
coils it will usually still turn, but will always go the direction favored by
the mechanical system, and it will have less torque.