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SMX3000LV No Output Power, 0% Battery | Smart-UPS & Symmetra LX / RM

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SMX3000LV No Output Power, 0% Battery

Discussion in Smart-UPS & Symmetra LX / RM started by Cody , 6/6/2019 2:15 PM
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Posted in: General

SMX3000LV No Output Power, 0% Battery

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  • Cody91

    So i am in a disagreement with our maintenance department. They seem to think that it is unlikely that the 120 Volt Supply Circuit Breaker for this UPS is being shut off, and the fault is likely with the UPS itself. I disagree.

    The SMX3000LV is a 2016 unit according to the factory testing sheet taped to the unit. The unit is plugged into a 120 Volt, 30 Amp receptacle. It is not connected to any external management devices, it is running as a standalone, isolated unit. Full load on the system is 2580 Watts, but it typically runs at 10% load according the LCD and the highest load I've seen is 30%. In the past week, on two separate occasions, the unit has gone to 0% Battery power and completely shut off output power to my equipment. And without any human intervention the power was restored to the equipment and the Battery % slowly climbed back up to 100%. The UPS is not showing any Alarms, Warnings, or Abnormal condition lights. I did observe the LCD screen in the 1st no power condition and the screen was still lit showing no Load and Battery 0%, the LCD screen did not shut off or go dark. Is it possible that this unit is spontaneously shutting off line power and battery power to my equipment, restoring itself, and then showing the batteries as completely drained and then showing them slowly recharging them with no faults? Could this be caused by a bad battery? Is there any other plausible cause for this situation other than the Input Power source being disabled long enough to drain the batteries completely?


    Thank you for your time,


  • liamg

    Hi Cody -

    Do you happen to have a Network Management Card in your UPS? If so, we can get the logs off of that and have a much better idea of why the UPS is switching to battery.



  • Cody91


    Unfortunately this unit is not equipped with a network management card.

  • liamg

    Ok, well you could always install Powerchute Business Edition on a PC (connected via USB or Serial) and gather some logs that way. It's possible that there are outages happening, but its also possible that there are just under voltage or over voltage conditions happening. You may may be able to deal with those by adjusting the voltage transfer points and/or sensitivity on the UPS.

    If you wanted to take a stab at making some adjustments without first gathering logs, you could do that as well. From the LCD screen of the UPS you will find an option called "Local Power Quality" in the configuration menu. If your unit is at defaults it will be set to "Good", which is the narrowest set of power parameters.  Try setting this to "poor", which is the widest set of parameters. This will allow your UPS to stay online during most all power events. We will never pass power that is outside of CBEMA standards, so your attached equipment will not be at risk of damage or anything like that.... You may very well find that making this change clears up the unexpected behavior.



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