A compensating rope sheave must be set to open if the sheave moves _______?

The correct answer is that a compensating rope sheave must be set to open if the sheave moves up or down beyond limits. The purpose of a compensating rope sheave is to maintain proper tension in the compensating ropes, which help to balance the weight of the elevator car as it moves. If the sheave moves beyond its designated up or down limits, it indicates that the elevator system is not functioning correctly, potentially leading to issues such as improper leveling, unresponsive controls, or safety hazards.

Setting the sheave to open in such situations allows for necessary adjustments to be made, ensuring that the elevator operates smoothly and safely. Properly maintaining the placement of the compensating rope sheave is crucial for the overall safety and efficiency of the elevator system. Adjustments are made based on the vertical movement of the sheave, which directly relates to the operation and performance of the elevator.