当用于防止逆转用途时必须检查转速不可低于超越转速最低允许值，如下页规格表中。
When used as a back-stop. It must be checked that the overrunning speed will not go below the minimum speed given in the next page table.
最低为字段的值允许的字符数是有效的。
Minimum number of characters allowed for the field value to be valid.
最低为字段的值允许的字符数是有效的。
Minimum number of characters allowed for the field value to be valid.
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