A crane accident caused by invalid position limit is introduced. The causes for invalid position limiters are analyzed, and the preventive measures are proposed.

介绍了一起因限位失效导致的起重机事故，深入分析了大小车极限位置限制器的失效原因，并从多方面提出了预防措施。

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Valve position high limit and valve position low limit setting.

阀位上限幅值和阀位上限幅值设定。

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The agency itself was divided sharply over the position limit regulation and twice the final meeting was postponed until a majority would vote for it.

FORBES: CFTC Position Limits Rule Divides Agency, Angers Market Participants

Chilton said he would have preferred even tighter limits for certain contracts, particularly precious metals, but added that simply establishing a position limit regime is critically important.

FORBES: CFTC Position Limits Rule Divides Agency, Angers Market Participants

Similarly, liberals find themselves in the strange position defending contracts that limit worker choice.

FORBES: Does Right-to-Work Increase or Decrease Freedom?