Need an advice on upgrading / converting spindle motor from MENTOR II / DC MOTOR to VFD / AC combo. MENTOR II board is burned and I'd rather change it for something more 'modern' if that makes sense. Given that DC drive is like 20HP I'm sure that I'll lose some / a lot of torque, but at the moment I just want to get machine running and MENTOR II drives are VERY expensive to repair, and I don't have parameters written down anyway.

Regards, JJL.