Question about NEC APC Smart-UPS 1400 (050-01803-000) UPS System

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Unit is switching to battery power for now reason.

I purchased this unit used about 1 year ago. It had new batteries installed at the time of installation. This week it started having problems. First our server began turning off, then booting up, turning off repeatedly. We removed the Smart-ups 1400 and this solved the problem. I had the batteries tested and all show to be in good condition. I reinstalled the batteries and plugged the unit in with nothing plugged into it. after about 10 min, the unit starts beeping and begins switching to battery power. If I turn it off and back on, it does the same thing all over again. I'm trying to find out what could be wrong.

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  • Gruber Power Services
    Gruber Power Services Jun 04, 2016

    Change the sensitivity from auto to low. It's a small white button on the back. The green LED next to it will change in brightness. Change it to off or the lightest shade of green.

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  • NEC Master
  • 5,568 Answers

Any UPS monitors the incoming AC level to determine if it is needed or not.  I think the APC unit doesn't know any more when it is needed; it's sick.

Posted on Sep 23, 2008

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Wireless Digital Thermometer GE5805WS4
Instruction Manual

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Button Function
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