10hp Motor Help

If the previous owner was using a RPC and it was running fine, I'd have to agree with the others who posted--- that it's the VFD that is the issue.
I've never had a VFD so I can't comment on how "great" they are. Only thing is, I am a fan of rotary phase converters; a properly sized RPC will run any 3-phase motor that you currently own or may purchase in the future. No programing, Yada, Yada, Yada, you get the picture

I would think the VFD is cutting out. Surprised the unit is running under load. I have a 20HP VFD running a 10HP AIR COMPRESSOR and it runs great, at least the last 10 years. I have it setup to ramp up on startup and the lights in the shop are never flickering, etc.

I would be careful running an old motor at a different cycle as they will get pretty hot fast. Old motors were not designed to run that way.

Merle

I did a quick search on a CM20 and found that it was equipped with a 20 hp motor. Yours has a 10 hp motor with a larger drive pulley and an undersized VFD. Sounds like it's way under powered. No wonder it wants to stall.

Chris