I found a post from a few years' back with a similar problem:
viewtopic.php?t=527
I will do some more research and catch up when I have time. This forum is fantastic. Thank you for your help.

Thank you for the clarification. I'll keep working on it. If anyone has any other ideas, please let me know.

Hello all, in case it would help to peak anyone's interest, today I was able to connect my DMM, set to continuity mode, and tested each gate driver's (optocoupler's) cathode for continuity with one of the 30 pins. I believe I found each pin associated with each optocoupler's cathode, for a total of ...

Hello all, I would like to upgrade an old Magnetek/Yaskawa GPD515/G5 VFD to support PM synchronous motor control. The unit only supports AC induction motor control; otherwise the unit functions well. The power stage is designed for 75+ HP. I am considering using the existing power stage and gate dri...