Never seen one in use but those drives supposedly will drive (by selecting the right parameters) a two wire submersible pump motor as well.
Never taken a two wire pump assembly apart, but kind of have to presume it is either PSC, has start switch, or even a start capacitor. Any capacitor obviously would be in the submersible assembly.
Most the two wire submersibles I have run into are on somewhat shallow wells (like 30 to 50 feet deep) and often are out in a pasture providing water to an open piping outlet to a tank for livestock drinking water.
