注意:
为能安全工作，Tricon一定要，按图4-1“标准电源布线”一节始终接地。
2.3.2 特点
在正常环境中，两个电源模件都是工作的，每一个都向Tricon供电，此时只有PASS和POWER两个指示器点亮(ON),任何一个电源模件都可在一定时间内单独给机架供电.
注意！
为保证系统的安全性和完整性, 分别独立地把每个电源模件接在不同的电源上，并在各自电路装设独立的电路断路器或开关。
如果电源模件之一或它的输入电源故障，另一个模件就会加大它的输出以保持Tricon的电源供应。如果进户输入电源中断，或者两个模件之一故障，它的FAULT 指示器将点亮（ON）。您可以把故障的电源模件从现场电源上断开，把它从Tricon机架上取下，并予以更换而并不需要中断Tricon的控制。
2.3.3 报警描述
各个电源模件上的报警电路独立地进行工作。您应该把报警系统接线成为双重冗余的配置，以便使系统的激发不依赖于来自仅仅一个电源的电力。图2-6示出了这种布线方式的一个例子。
图2-6 主机架报警接线示例
图中①电源1 ②电源2 ③负载（铃、灯光、报警声、等等）
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