Which controller governs the vertical movement of the crane?

Which controller governs the vertical movement of the crane?

• A. Trolley controller
• B. Hoist controller
• C. Bridge controller
• D. Travel controller

Answer: (B)

Vertical movement refers to lifting and lowering the load, which is done by the hoist. The hoist is the lifting mechanism mounted on the trolley, powered by its own motor, and the hoist controller directly energizes that motor to raise or lower the hook and load. It also typically handles safety features like limit switches and emergency stopping to prevent over-travel or overload. The other controllers manage horizontal motion: the trolley moves the hoist along the bridge, the bridge moves along the runway, and the travel-related controls relate to overall crane travel. Because only the hoist handles vertical motion, the hoist controller is the one that governs vertical movement.

Vertical movement refers to lifting and lowering the load, which is done by the hoist. The hoist is the lifting mechanism mounted on the trolley, powered by its own motor, and the hoist controller directly energizes that motor to raise or lower the hook and load. It also typically handles safety features like limit switches and emergency stopping to prevent over-travel or overload. The other controllers manage horizontal motion: the trolley moves the hoist along the bridge, the bridge moves along the runway, and the travel-related controls relate to overall crane travel. Because only the hoist handles vertical motion, the hoist controller is the one that governs vertical movement.