hey solid, this is really weird. Is the motor hum because of the brake holding or because of a motor issue? have you meggered it? By the way ive never seen a 2 phase motor!! I'm trying to remember the drawing and would imagine the reverser cct as u or d and br then all we are doing is reversing 2 phases for direction. By having different fuses blowing indicates its not the same phases overloading which makes this harder. Do you know where the lift is in the shaft? I wonder if the slipper guides are tight on the rails at a specific point in the shaft? Im just spit balling here. When you run temp brake wiring I would also look to tong test the 3 phases going to the motor as well and even run temp wiring for these too. This type of intermittent faults can be a prick to find. Ultimately you have an over current situation and you have to isolate everything with this in mind.
