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Many momentary power dips... during the night only

 
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Mike Harrison
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Joined: 03 Nov 2007
Posts: 2029
Location: Equidistant from New York City and Philadelphia, along the NJ Shore

PostPosted: Tue Sep 19, 2017 11:15 am    Post subject: Many momentary power dips... during the night only Reply with quote

During the overnight hours, my APC Back-UPS apparently senses momentary drops in line voltage/current, switches to the battery and sounds the alarm. These drops last only between about one and three seconds, but it goes on repeatedly (though not constantly). I sleep in the room next to my office and, while the alarm doesn't wake me, I do hear these occurrences when I get up during the night.

The REAL puzzle is, this only happens generally between 11pm and 8am (although it occasionally goes later). During the day, all is good.

Thinking it may have been a faulty battery, I replaced it earlier this year to no avail. Besides the Back-UPS and the other things typically found in the home, there's nothing that uses electricity during the night, so there's no big "draw" to blame this on.

My electric utility came out today and ran a test between my electric meter and the nearest transformer and found nothing wrong.

Is it possible that my Back-UPS is becoming more sensitive as time goes by? I can't imagine what else might cause this. Any suggestions?

Thanks!
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Bruce
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PostPosted: Tue Sep 19, 2017 1:22 pm    Post subject: Reply with quote

Do you have a prison nearby? They could be testing the chair, flipping the switch on and off and on and off.


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todd ellis
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PostPosted: Wed Sep 20, 2017 5:39 am    Post subject: Reply with quote

power conditioner in front of the ups?
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Dave Waters
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Joined: 01 Jan 2011
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Location: Dallas, Texas

PostPosted: Wed Sep 20, 2017 7:24 am    Post subject: Reply with quote

I had a similar problem and it was because I had my UPS plugged into a GFCI circuit. Your outlet can be on a GFCI circuit even if it is not a GFCI outlet.

See:
http://www.apc.com/us/en/faqs/FA158850/
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Lee Gordon
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PostPosted: Wed Sep 20, 2017 8:44 am    Post subject: Reply with quote

Christie microwaving snacks in the middle of the night. Sarcastic
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Mike Harrison
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Joined: 03 Nov 2007
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Location: Equidistant from New York City and Philadelphia, along the NJ Shore

PostPosted: Wed Sep 27, 2017 7:47 am    Post subject: Reply with quote

Lee Gordon wrote:
Christie microwaving snacks in the middle of the night. Sarcastic

Ha! A distinct possibility!

APC (the back-UPS manufacturer) gave me instructions for resetting the unit's internal processor, which I did Tuesday. All I can say today is that it APPEARS the number of incidents is somewhat reduced, but it still occurs.

But whether it's a ground issue or something a power conditioner might cure (thank you Todd & Dave), I can't imagine why this happens pretty much only during the overnight hours.

I thought of using a heavy duty extension cord to plug the unit into a different circuit, but I don't know why the results would be any different.
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