We have a Powerware 9125 and came in this morning to hear it running really high. After a few minutes of that, it will go back down and be quiet for a few seconds before revving back up. I looked at the display and realized it was in standby mode so I did the self test and it appeared to be fine. I powered it on to put it in Normal mode and it's showing the current load capacity so it appears to be working. However, it's still revving up and down so I don't know if that's an indication of something else. I looked through the manual but don't see anything related to that.
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