A swinging load should be controlled by which combination of controllers?

A swinging load should be controlled by which combination of controllers?

• A. Bridge and trolley controller
• B. Bridge and hoist controller
• C. Trolley and hoist controller
• D. Limit switch and hoist controller

Answer: (A)

Swinging a suspended load happens when there’s abrupt horizontal motion. To dampen and control that sway, you need to manage the load’s horizontal position from both directions along the crane: the bridge moving along the runway and the trolley moving along the bridge. Coordinating those two axes lets you guide the load smoothly toward its destination with gentle, matched movements, reducing sideways acceleration that would cause swing. The hoist control manages up-and-down motion, which doesn’t directly counteract the pendulum swing. Limit switches set travel limits but don’t address sway either. So the most effective approach is to use both the bridge and trolley controllers together to control horizontal motion and minimize swing.

Swinging a suspended load happens when there’s abrupt horizontal motion. To dampen and control that sway, you need to manage the load’s horizontal position from both directions along the crane: the bridge moving along the runway and the trolley moving along the bridge. Coordinating those two axes lets you guide the load smoothly toward its destination with gentle, matched movements, reducing sideways acceleration that would cause swing.

The hoist control manages up-and-down motion, which doesn’t directly counteract the pendulum swing. Limit switches set travel limits but don’t address sway either. So the most effective approach is to use both the bridge and trolley controllers together to control horizontal motion and minimize swing.