GY and GY20- WBS sensors

WBS sensor on base brush

The emergency shutdowns are freely accessible, and can be activated by anyone on the go. The system will think it is an emergency, and the brakes will be applied and the plant will be stopped. In the worst case, because of the unexpected brake, the passengers could fall.

Fortunately, no one was hurt this time, but the plant is on hold, and all have to take the long stone steps until the operator presses the RESET switch- unless the escalator has an automatic restart control (“WBS”).

In this case the sensors over the steps scan the tread area and look for obstacles. If the steps are clear, it assumes gross fooling and lets the step bands run again.