drum switch with 2 limit switches

Thread Starter


Joined Oct 18, 2009
I built a bifold hangar door that used cable and a winch attached to the rafter for lifting. It was probably similar to your folding stairs. A rotary limit switch was attached to the end of the drum axil. It could be set for multiple turns and had adjustable stops for open and closed (i.e., down). I let the cables go just a little slack in the down position to take strain off the winch.


I too am wiring a bifold hanger door. I will use a 1hp reversible motor with a drum switch. I want limit switch to stop the door at the top and a limit switch to stop the door motor at the bottom. Can you advise me as to how to accomplish this? Attached is the wiring diagram for the drum switch.



Joined Oct 2, 2009
A couple of questions:

Are you willing to add a contactor to switch the motor off (so that the limit switches carry the coil current of the contactor; not the actual motor current)?

Do you want the limit-switch wiring to be low voltage so that you do not have to run it in conduit?

Ps, I have a hangar with a bifold door