I have a total of three 3-phase floating fountain aerators. Last year they functioned properly. This year when I connected them, two of them were running in reverse and 1 was running forward. All motors have submersible plugs, so the wiring cannot be changed upon hookup. The hookups are keyed so they can only hookup one way.
I shut off the system, swapped wire 1 with wire 3 in the panel on the 2 motors that were running in reverse. When I started them up again. 1 of those motors was running in reverse and the other forward. I then swapped the wires on the one running in reverse and it began running forward at that point.
So now, all three fountains are running normally, but I am afraid to leave them running in case the phases switch on startup and them running in reverse causes the impeller to fly off.
This seems impossible from my understanding 3 phase motors, does anyone have any ideas?