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  3. December 2004

Re: Split Power on an 825

Jay,

Good thinking on the split power. Just make sure that EACH UPS is capable of the full load! While testing this in the past we watched UPS two shut down when UPS one was disabled... Not the intended result! Once properly sized and devices needing power protection connected to the UPS that you TEST it. Once your TEST is successful, make sure that NOTHING else gets plugged into those UPSs. If you do, you can no longer be sure that you are redundant.

As to the voltage difference. It shouldn't matter. The 825 needs at least 208v power the 5095's will run on either 110 or 208/240. I would use both 208v units if I had the choice rather than the 240v, though I don't have an engineers answer as to why.

 - Larry

Himes, Jay wrote:

We currently have an 825 with redundant power supplies as well as 2 0595
expansion units.

We would like to add power redundancy by placing each unit on 2 UPSs (1
power supply on 1 UPS the other on the second UPS). 

Has anyone done this? Any cautions or caveats?

Is there a concern with line voltage differences? We have 3 UPSs; 2 of
which output 240v, the third is 208.

TIA,
Jay Himes
Liberty University



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