Will the elevator in the grocery store go down or not?

The escalator is started by the start key, but it is actually a single-pole double-throw switch inside. Can goes down, indicating that the safety loop is normal and the working state can also be in the working state. Check whether the key start switch has poor contact in one direction, which makes it impossible to run in one direction. If there are drawings, you can directly give an analog working signal in the control cabinet to see if it can run.