What crucial aspect must an elevator meet during a buffer test regarding its speed?

During a buffer test, it is essential for the elevator to operate at full speed to effectively assess the performance and functionality of the buffer system. This test simulates conditions that an elevator may encounter during a real-life situation, such as an emergency stop or a mishap in the hoistway.

Operating the elevator at full speed allows for a thorough evaluation of how well the buffer can absorb kinetic energy and safely decelerate the elevator. Full-speed operation ensures that the test accurately reflects the buffer's capability to handle the maximum forces it might face. If the elevator were to operate at minimum speed, maximum speed, or remain stationary during the test, it would not provide valuable insights into the buffer's effectiveness under typical operational conditions. Thus, running the elevator at full speed is crucial for ensuring that all safety and operational standards are met and that the system can handle its intended safety functions.