So a little explanation I asked for 2 limit switches on top and 2 on bottom. The primary limit switches will stop the unit and the secondary ones is in case of failure of the first switch. If any of these are pressed the lift automatically stops. For the travel limit switches there is one with a flat bar and one with a roller on top and bottom. The elevator doors use limit switches as well. In case both switches are not depressed, the lift will not function.View attachment 153400