Safety detection device and escalator or moving walkway incorporating the device

Abstract

A safety detection device includes a first switch connected to a power supply, and which will switch from a first state to a second state when an abnormal event occurs. The safety detection device further includes an excitation unit which, in an energized state, will cause the first switch to switch from the first state to the second state. A second switch is also connected between the power supply and the excitation unit. In a first mode, a controller of the safety detection device disconnects a connection between the power supply and the excitation unit by controlling the second switch and determines whether the abnormal event occurs. In a second mode, the controller connects the power supply with the excitation unit by controlling the second switch, and determines whether a function of the first switch is normal based on the voltage at the other end of the first switch.

Dependencies are inferred from the claim text.