I guess the manuf of the board can answer best as not having used this board but just looking at the PDF manual, I would have thought if the unit was manuf in Australia that the SSR would be 240v rated?
If in doubt, you can always use the SSR to pick up a larger contactor/relay for higher currents or voltage's.
It would appear you can possibly control the speed if your present controller is using a pot to control speed, the PDF shows a way of removing it and feeding the control from the BOB.
But again, it would pay to get specifics from the manuf. support.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.