What mechanism prevents an elevator from receiving a stopping signal when it is too close?

The mechanism that prevents an elevator from receiving a stopping signal when it is too close is the late call refusal. This feature is designed to ensure that the elevator does not stop in a position that could endanger passengers, typically when the elevator is approaching a floor too rapidly or is already in a position where stopping could lead to misalignment with the landing. By implementing late call refusal, the elevator system effectively ignores calls to stop when it is detected that a danger of misalignment exists, thus enhancing safety.

This mechanism works in conjunction with other safety features like limit switches and emergency systems. While limit switches monitor the elevator's position and can halt movement at predefined points, late call refusal specifically addresses situations where a stopping command may be hazardous due to the elevator's speed or proximity to the floor.