What does PH signal mean?

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Sergey Shilov2014-06-25 20:05:21

Power Supply

Sergey Shilov, 2014-06-25 20:05:21

Good afternoon. I have 3 indicators on the PSU and the PG signal sometimes lights up red, tell me what this means and in what state should it usually be?
I am attaching a photo:

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