NEIEP Mechanics Practice Exam

What is the function of the compensation sheave switch?

1. To monitor the speed of the elevator

2. It opens if the sheave moves up or down beyond limits

3. To prevent rope slipping

4. To engage the safety brake system

The correct answer is: It opens if the sheave moves up or down beyond limits

The function of the compensation sheave switch is to open if the sheave moves up or down beyond designated limits. This is an important safety mechanism in an elevator system, as it ensures that the compensation sheave, which is part of the system that allows for movement due to changes in load and position of the elevator, operates within a controlled range. By monitoring the position of the compensation sheave, the switch helps prevent potential malfunction or failure of the elevator, providing a critical safety measure in maintaining the proper function of the elevator system. If the sheave moves too far beyond its designated limits, opening the switch will signal the system to take action, which may include stopping the elevator to prevent further issues.