John, let me guess, this was a remote control lift?
I drew the controller as a DPDT switch just to show how the logic works. It is really done with a box full of relays. I am still not sure why it is done this way. They still have 2 relays per direction. My guess is the original design was one relay each way but that would have left one side energized. (as my picture is drawn)
Last edited by gfretwell; 10/28/11 09:02 PM. Reason: add a thought
