The purpose of a limit switch in a motor control application is to:

The purpose of a limit switch in a motor control application is primarily to ensure the motor does not exceed its designed range of motion. Limit switches are mechanical devices used to detect the presence or position of an object, usually in a moving system. They provide feedback to the control system about the exact position of the motor or actuator, preventing over-travel in either direction, which can lead to mechanical failure or accidents.

By using limit switches, operators can define the maximum range within which a motor or device can operate safely. When the limit switch is activated (for example, when the moving part reaches a predefined limit), it sends a signal to the control system to stop the motor's operation, thus protecting the equipment and ensuring it operates within safe limits. This functionality is crucial in various applications, including elevators, conveyor systems, and automated machinery, where precise positioning is essential for optimal operation and safety.

While other options may seem relevant—such as powering the motor on or acting as a safety cut-off—the primary role of a limit switch is to establish boundaries and protect against exceeding those boundaries. This distinction is what makes the focus on limiting motor travel the most accurate understanding of the limit switch's purpose.