so I've been running these closed loop steppers on my mill for a while (KL-8082H) and never had a problem. I've building a lathe right now, using the KL-5080H steppers as they are about perfect for the size lathe I have. So here's the issue. The steppers work perfect until I put load on them, and then I get a following error from the control as soon as I try to jog the machine. There is next to no holding torque either.

I downloaded the protune V2 software, but can't seem to get it working correctly. It gives me an error and closes itself as soon as i try to read the RAM....not very helpful...

Any one have any ideas?