这一规定位置，继电器驱动单元关闭时由于低电池状态。
This establishes the position that the relay is driven to when the unit shuts down due to low battery state.
文中论述了利用因果网技术进行故障定位的方法，因果网描述了故障元件、继电器、开关之间内在的动作关系；
This paper discusses the fault locating method based on causality network technology, and the inherent operating relationship between the faulty element, protective relays and circuit breakers.
门机运行到该位置输出“指定位置”继电器信号。
When the door motor run to the position, it output pointed position relay signals.
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