I'll need to find some info on the motor as the old board is set for max voltage of 50V which seems a bit low (ISTR Triacs go up to 180V). I'm also trying to figure out how to use the 0-10v output from the RMHV controller to set the speed as I'm not sure if I need some form of isolation between the two.
I have just converted a Novamill that seems to have had the same control board. I used one of these https://www.ebay.co.uk/itm/111654184682 and a small 230V ac to 15V V DC power supply https://www.ebay.co.uk/i/26304063959...r=562044038463 so to keep the isolation from the motor control board.