Yaskawa J7 Vfd Giving Oc Fault Without Motor Connnected

I'm trying to connect a VFD that I had kicking around to control a belt sander that I'm rebuilding. I wasn't sure of the condition of the drive so connected it up and give it a spin. It powers up the display okay and I can do programming on it but when I try to put it in RUN mode, I get an OC message right away. Even without a motor attached. Some reading points me an IGBT being shot.

Anyone have any experience with these that can share their knowledge? I'm not adverse to opening this up...

Yaskawa J7 Vfd Giving Oc Fault Without Motor Connnected