What type of resistance is present during the initial closing phase of the door?

During the initial closing phase of the elevator door, high resistance is encountered primarily due to the mechanical dynamics involved. As the door begins to close, it needs to overcome any initial inertia and friction that might be present in the door mechanism, tracks, and components. This requires additional force, resulting in high resistance.

This high resistance is crucial for ensuring safety and proper alignment of the door. It allows the system to detect any obstruction quickly, ensuring that the door does not close on an object or person, which would pose a significant risk. The presence of high resistance during this phase is part of the system's fail-safes to prevent accidents. Understanding this mechanism is essential for properly maintaining and troubleshooting elevator door systems.