What condition must the shuttle of the stacker meet when testing the elevating velocity?

When testing the elevating velocity of a stacker, it is essential for the shuttle to be under no load. This condition is crucial because the absence of a load allows for an accurate assessment of the stacker's elevating speed without the variables introduced by weight.

When the stacker is unloaded, the test results will reflect the maximum potential elevating velocity of the equipment in optimal conditions. This data is vital for understanding the performance capabilities of the stacker and ensuring that it meets safety and operational standards. If the shuttle were to be tested under load, the elevating velocity might be slower due to the additional weight, leading to misleading results regarding the stacker’s actual performance capabilities.