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Battery Back-up problem

By dennisbv ·
I have three servers each with its own APC Battery back up. server 1 has a smart UPS 1400. server 2 has a smart ups 1500. server 3 has a smart ups 1500.
The problem We installed a back up generator to power our computer room, but when we were testing it servers 2 and 3 back ups kept going on and off of battery. Server 1 had no problems. They are all plugged into the same lines.
The generator was installed by a qualified electrician. What could the problem be?

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Battery Back-up problem

by d.walker5 In reply to Battery Back-up problem

I had a somewhat similiar problem. Win2k SP1, using a UPS with the Smart Signaling mode drained the battery by going into Battery Calibration mode. Installing SP2 solved my problem--hope it can work for you.

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Battery Back-up problem

by dennisbv In reply to Battery Back-up problem

We have sp 3

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Battery Back-up problem

by timwalsh In reply to Battery Back-up problem

How were you testing the back-up generator?

Normally, the Smart-UPS series will cause the battery to kick-in for one of several reasons:
No power, extreme voltage spike, extreme voltage sag.

Depending on what was going on at the time, I wouldbe more concerned that all three server UPS did not exhibit the same behavior.

When you say they are all plugged into the same lines, do you mean they are all on the same circuit?

Something related to power was causing the 2 UPS to cycle back and forth between the battery and AC. Why wasn't the UPS for server 1 similarly affected? It could be a configuration difference in the software. Did the 2 UPS both cycle to battery at the same time? It could be that after the 2 UPS kicked their batteries on, there was sufficient power remaining to NOT cause the 3rd UPS to kick on. It could be that server 1 is on a circuit that is not covered by the back-up generator. Or it could be that server 1 is on one circuit and server 2 and 3 are ona different circuit, and only the second circuit was experiencing problems.

You really need to get an electrician back in there to check things out. Without knowing how your computer room is wired, all we can do is guess.

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Battery Back-up problem

by dennisbv In reply to Battery Back-up problem

The electrician was here while we were testing. There are two circuits and server 1 and 2 are on the same one, 3 is on the second. Both circuits are on the Generator. The way we were testing was we switched the circuits off in the computer room and plugged in the generator and switch the circuit over to the generartor. Like I mentioned server 1 worked great and because that one and one of the problem ones are on the same circuit is why we are stumpped?

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Battery Back-up problem

by TheChas In reply to Battery Back-up problem

I agree with Tim.

The root of the problem is most likely that the generator output voltage is very near the UPS switch-over threshold.

It is possible that the different reactions of the 3 UPS systems is the result of manufacturing tolerances.
You need to have the generator output voltage and waveform checked under full anticipated load.

Chas

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Battery Back-up problem

by dennisbv In reply to Battery Back-up problem

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Battery Back-up problem

by dennisbv In reply to Battery Back-up problem

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