What is a primary function of limit switches in elevator door operators?

The primary function of limit switches in elevator door operators is to prevent over-travel. Limit switches act as safety devices that monitor the position and movement of the elevator doors. When the doors reach their fully open or closed positions, the limit switches are activated, sending signals to the control system to halt the movement. This mechanism ensures that the doors do not continue moving beyond their designated limits, which could potentially lead to damage to the elevator system or pose safety risks to passengers.

The role of limit switches is crucial for the reliability and safety of elevator operations, as they help to maintain proper alignment and functioning of the doors. By preventing over-travel, these switches ensure the smooth operation of the elevator door system, allowing for safe entry and exit for passengers.