Pedestal cranes have limit switches to...

🔍 Key Concepts

• Pedestal crane motions: luffing (boom up/down), slewing (house rotation), hoisting (load up/down) • Limit switches: safety devices that stop motion before mechanical or structural limits are exceeded • Difference between rate limits (speed of motion) vs travel limits (how far a motion can go)

💭 Think About

• Which crane movement, if allowed to rotate too far, could cause the crane to hit structural stops, crush equipment, or foul with ship structures? • Do limit switches usually control how FAST a motion occurs, or do they primarily stop motion at the END of its safe range? • Among the options, which one clearly refers to how FAR the crane can rotate in azimuth, rather than how quickly it moves or how much power is applied?

✅ Before You Answer

• Identify which answer choices refer to speed/rate versus which refer to distance/angle of movement • Recall that limit switches are typically installed at the ends of travel (end stops), not to control normal operating speed • Confirm in your mind which function describes the crane’s rotational range around its pedestal rather than its speed or power

Pedestal cranes have limit switches to restrict the movement of which function?

Luff rate limits

Swivel power limits

Slew rate limits

Slew travel limits