Error in the repair process, while also correct rotor position, but because of the existence of a balance disk ladle excessive bias (or balanced partial ring dipper), and its role in loss of balance.

• 在检修工艺错误时，虽然转子位置也正确，但由于平衡盘存在有过大的瓢偏（或平衡环瓢偏），而使其失去平衡作用。