Overhead Crane Practice Test

What is the purpose of the upper limit switch on an overhead crane?

1. Prevent load swinging

2. Limit hoist travel

3. Enhance load stability

4. Reduce motor speed

The correct answer is: Limit hoist travel

The upper limit switch on an overhead crane serves a critical safety function by limiting the travel distance of the hoist. When the hoist reaches its uppermost position, the limit switch is activated, which in turn signals the crane's control system to stop the hoisting action. This prevents the hook or load from lifting beyond a certain point, which could lead to potential equipment damage, safety hazards, or accidents. By restricting the vertical movement of the hoist, the upper limit switch contributes significantly to maintaining control and ensuring the safe operation of the crane. While the other functions mentioned, such as preventing load swinging, enhancing load stability, and reducing motor speed, are important aspects of crane operation, they are not the primary role of the upper limit switch. The main purpose centers around controlling hoist travel to protect both the equipment and the safety of personnel involved in crane operations.