Question about APC (SUA3000I) UPS System

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Failing APC 3000s

We have purchased 8 of these units, and have installed 4 of them so far. After a few days, the first unit installed began to fail. Within the last week we have had the 2nd and 3rd units fail. The batteries test fine and appear to be fully charged, however the control unit begins to flash a red indicator and then turns off. We have swapped 2nd and 3rd units with the remaining systems and I received a note on Friday that one of those has begun to trip out and turn off.
I'll get to take a closer look at these units tomorrow, but anyone else having these problems with these units.

It's not looking good for this model from our perspective.

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Well it could be the driver of the relay havin the problem or the mosfet is faulty.. that will be the hardware problem hmmm i askin hav you install any software or smnp card?? and how high is your input current?? and how much load you connected to ups.. i suspect the UPS u purchase it frm the USA and the current that opperated is 208ac it could be also the problem if the ups havin setup to 240ac..

Posted on Mar 24, 2009

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Posted on Feb 10, 2009

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Xdm46cc


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It is not clear whether M&S replacement units have addressed this problem or not. Therefore, to fix the problem for my customers, I added and additional small power supply (fits inside the case) and injected the signal on the input side of the 5VDC regulator. My solution hopefully will not expire after 4 years.

It appears to me from my small sample size that M&S may have a flaw in their original engineering and replacing it with the same will guarantee future failure.

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/bz

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