When does the up limit switch normally stop the hoist from reeling in?

When does the up limit switch normally stop the hoist from reeling in?

• A. It stops reeling in when the cable has been paid out to the preset limit
• B. During startup, to reset the system
• C. It stops reeling in when the motor reaches maximum speed
• D. It stops reeling in when the cable has been wound back on the drum

Answer: (D)

The up limit switch is a travel safeguard that stops hoist movement when the rope has been wound fully onto the drum. As you lift, the drum winds more rope onto itself, and there’s a maximum amount it can take. When that limit is reached, the up limit switch is triggered and the drive is stopped to prevent over-winding, which could damage the rope, drum, or motor and could cause a safety hazard. This is not about the rope being fully unwound or about startup or speed. Unwinding to a preset length would relate to a different travel condition, and limit switches aren’t triggered by motor speed or startup sequences. The critical idea is that the up limit stops reeling in when the cable has reached the drum’s maximum wound condition.

The up limit switch is a travel safeguard that stops hoist movement when the rope has been wound fully onto the drum. As you lift, the drum winds more rope onto itself, and there’s a maximum amount it can take. When that limit is reached, the up limit switch is triggered and the drive is stopped to prevent over-winding, which could damage the rope, drum, or motor and could cause a safety hazard.

This is not about the rope being fully unwound or about startup or speed. Unwinding to a preset length would relate to a different travel condition, and limit switches aren’t triggered by motor speed or startup sequences. The critical idea is that the up limit stops reeling in when the cable has reached the drum’s maximum wound condition.