Trip Switches on 1ph winch trolley

If there is a motor starter or contactor that runs the motor then--

Put a normally closed limit switch that will open when the the trolley hits the high point, the switch is tripped and the contacts open that are in series with the control power for the up circuit. With the contacts open, there is no way to run the motor up.

Put a normally closed limit switch that will open when the trolley hits the low point, the switch is tripped and the contacts open that are in series with the control power for the down circuit. With the contacts open, there is no way to run the motor down.

If the circuits carry the motor current, the limit switch contacts will have to be sized to handle it.

Brock. You haven't supplied a lot of information to work with but if regulations permit I would look into a motor that allows a position sensor to be mounted to the shaft. Then you can have the motor controler programed to stop the trolley at exactly the same place at both ends of the run. You could also add a softstart to allow for a slow smoth start that would reduce the sudden jurking start that you will probly experience otherwise. The use of this type system may fall under different code parameters and eliminate the need for limite switches on both ends. If the system wasn't well thought out in the beginning you may have to discard the current components and start over. Information such as distance? Whinch cable run? Does the same power source supply both ends now? Does the trolley run on rails or is it suspended from the cable? Would all be helpfull.

Wish you success. J.Conway

Brock. What's the possibility of a gravity decent with the winch drive disengaged so it will freewheel and a brake on the winch to control decent speed? What type of braking do you have now and how critical is an exactly placed stop?

If I can get the image to post, this is how we did exactly what you have described, but using a 3-phase motor. It should work exactly the same with a single phase motor, assuming the single phase motor is reversible. Not that the contactors require a lock-out device so they can not be activated simultaneously:

I was in the field installing automatic gates for a few years.

This is a very basic circuit and can be found on almost all sliding gate operators.

Google a couple companies and check out their ladder diagrams that they might have on line.

easy peasy

If you're in Chicago? ;)

It is very simple just buy a reversing motor starter from Allen Bradley, Schneider or another supplier this will come with interlocks to prevent the controls from operating together. A couple of limit switches from Schneider or another supplier check out their online catalogues for a suitable design (there are hundreds of them) one will suit you application a few metres of cable and you have a a unit which will comply to all codes and standards.