Which device is primarily used to limit the travel of the hoist?

Which device is primarily used to limit the travel of the hoist?

• A. Limit bridge travel
• B. Limit trolley travel
• C. Limit the bridge and trolley travel
• D. Limit the hoist travel

Answer: (D)

Limiting the hoist’s motion is handled by a hoist travel limit switch on the hoist itself. These switches detect when the hoist has reached the top or bottom of its vertical travel and cut power to the hoist motor, stopping movement to prevent over-winding the rope or hitting the limit of the hoist frame. This keeps the load within safe vertical bounds and protects the equipment. In contrast, a bridge travel limit switch controls how far the crane bridge can move along the runway, and a trolley travel limit switch controls how far the trolley (and attached hoist) can move along the bridge. Those limits protect horizontal movement, not the vertical hoist travel. So the device primarily used to limit the travel of the hoist is the hoist travel limit switch.

Limiting the hoist’s motion is handled by a hoist travel limit switch on the hoist itself. These switches detect when the hoist has reached the top or bottom of its vertical travel and cut power to the hoist motor, stopping movement to prevent over-winding the rope or hitting the limit of the hoist frame. This keeps the load within safe vertical bounds and protects the equipment. In contrast, a bridge travel limit switch controls how far the crane bridge can move along the runway, and a trolley travel limit switch controls how far the trolley (and attached hoist) can move along the bridge. Those limits protect horizontal movement, not the vertical hoist travel. So the device primarily used to limit the travel of the hoist is the hoist travel limit switch.