电梯停电应急平层装置，简称ARD或EPD，亦称停电应急救援装置。当运行中的电梯突然停电，电梯配置停电应急平层装置的话，该装置就会自动投入工作，输出电梯所需电能，将电梯运行至平层位置（开门区域），打开轿门放出被困乘客。

也就是说，遇到断电、火灾等供电系统故障

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