I don't know if the RK05 is switchable or not; just an idea.
Not easily. There's a jumper plug on the PSU chassis to change the
transformer primary connections (2 windings in series for 230V, in
parallel for 115V), but I think you also need to change the spindle motor
(!). The blower is 115V in both versions of the drive. There's also a
pulley change when you go between 50Hz and 60Hz.
-tony