What is the primary function of the hoist limit switch?

What is the primary function of the hoist limit switch?

• A. Monitor length of hoist cable on the drum
• B. Control motor speed
• C. Regulate hydraulic pressure
• D. Prevent overheating of the motor

Answer: (A)

Hoist limit switch is a safety device that stops hoist motion when the cable has reached the drum’s programmed end of travel. It monitors the length of hoist cable on the drum, and when the preset limit is reached, it interrupts the electrical circuit to stop the motor. This prevents over-winding, cable overlap or tangling, and damage to the drum and rope, especially at the limits of travel. It doesn’t control motor speed, regulate hydraulic pressure, or protect against motor overheating; those functions are handled by the appropriate speed control, hydraulic regulation, or motor protection systems.

Hoist limit switch is a safety device that stops hoist motion when the cable has reached the drum’s programmed end of travel. It monitors the length of hoist cable on the drum, and when the preset limit is reached, it interrupts the electrical circuit to stop the motor. This prevents over-winding, cable overlap or tangling, and damage to the drum and rope, especially at the limits of travel. It doesn’t control motor speed, regulate hydraulic pressure, or protect against motor overheating; those functions are handled by the appropriate speed control, hydraulic regulation, or motor protection systems.