Nuera,
There is much to consider when tring to swap from a 3ph motor to a 1 ph motor due to a 3hp 3phase 230v. motor (approx. 9.5 amps)pulls less than a 3hp 1phase 230v. motor(approx. 17 amps).
I am not familiar with that brand starter, but they are all basicly the same. Here is the basics...