I have a new water well pump installation at a remote location that runs on 240V. My old portable power generator had a 3-prong receptacle (I just connected the 10ga. 2-wire plus ground lead from the pump to a 3-prong, 30 amp, 240v plug that was supplied with the generator. The pump worked without a problem). Now I have a new portable generator with a 240v receptacle that is 4-prong. I bought a 4-prong plug. Can I just use the White, Black and ground connections and ignore the connection for a Red wire since I don't have a Red wire? Or will that only give me 120v? What do I need to do? Thanks!