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APC SmartUPS XL 750 allowing server restart

APC SmartUPS XL 750 allowing server restart

APC SmartUPS XL 750 allowing server restart

I have a sever that has restarted during a storm the past 2 days. It is hooked to an APC SmartUPS XL 750 next to an identical UPS and server which did not have a problem. All settings and display are same. Press self test and server reboots. Sensitivity set to high. Battery indicator full. No blinking lights. Only thing plugged into is HP Proliant server and monitor.

RE: APC SmartUPS XL 750 allowing server restart

If you self-test  the UPS and the server reboots, the batteries in the UPS may be bad, or the server is drawing more of a load than the UPS can provide. Are the monitors on the two servers different ? (is one a CRT and the other an LCD?) Something is different, either in the UPS's or the loads they support....
one other thing - you don't have the UPS's daisy chained, I trust - one connected to the wall, the second one connected to the first ? If that was the case, and everything else was identical, the UPS connected to the wall outlet would dump it's server when you pressed Self Test, since it would be trying to support its own server & monitor plus the load of the other UPS - while the UPS just running it's own server and monitor would be fine....

Fred Wagner


RE: APC SmartUPS XL 750 allowing server restart

All great points. They are not daisy chained and they are identical servers and monitors. The battery having a full charge indication is what gets me.

RE: APC SmartUPS XL 750 allowing server restart

If everything else is identical, then the batteries in the UPS's are not identical. Since one UPS runs its server OK in Self Test, and the other does not, you need to look into the one that isn't cutting it. shut down the server, unplug it from the UPS, and plug in something small like a desk lamp, and try a Self Test there. It should run a light load for hours. If it's still suspicious, run the Self Test with No load. If the unit is under warranty, exercise it. If not, consider replacing the batteries. Were the two UPS's purchased at the same time, or is one a couple of years newer ?

Fred Wagner


RE: APC SmartUPS XL 750 allowing server restart

The switch circuit in the ups that switches to the batteries could be bad, so when you click test, it cuts out the AC on the server. If your servers have redundant power supplies each power supply should be hooked to a different power source, or cross connect the power supplies to the ups outputs. That way both servers would stay up if you had a ups failure, or you had to replace the ups, you could do it hot.  

RE: APC SmartUPS XL 750 allowing server restart

Have never had redundant PS. Will have to check into that on new servers. Ordered a new UPS today. Hope I make it til Friday.

Thanks for the great feedback.

RE: APC SmartUPS XL 750 allowing server restart

Redundant, Hot-pluggable power supplies, connected to separate UPS's are a super-reliable way to go. But if you had them already, you wouldn't have discovered that one of your UPS's was bad! Whatever you choose, plan to have some 'down' hours once or twice a year when you can check everthing out. And if the UPS has monitoring software, be sure to use it.

Fred Wagner


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