Gantry-follower moves in opposite direction to leader

Hi

 

I have a setup where I need to drive to motors in leader follower configuration. However, these two motors need to be moving in opposite directions to drive the axis (ie #1j+ #2j- for the axis to move +).

I had used the GantryXCtrl method before but all the motors where moving in the same direction. I couldn't find any setup variables to command the follower motor to move in opposite direction. Is this possible and if so how to do it?

Is there a reason both motors need their positive in the same direction? Would it work to swap the direction of one motor so they are both positive in or both positive out?

They need to be rotating in opposite direction because of how they are mechanically coupled. I tried to change EncCtrl for one of the motors to swap the counting on the PMAC but that caused issues with phasing.

If you have the motor fully set up and working, then you can use the "Reversing Motor Jogging Direction" in the Power Brick LV ARM (or AC) manual to find all changes required to change the motor's positive direction.

 

Or did you mean that the $ command fails because the other motor is not freely moving?