UPS with a HP Proliant server

Solution 1:

I've seen this before and it's come down to the newer power supplies do not like the less expensive UPS systems.(it's not just HP) These new power supplies can detect fluctuation of 3ms and I've seen the UPS's response times to be from 3-5ms (on the low end). If you want to stay with Eaton try the PowerWare 9130

Solution 2:

There could be multiple problems here. Assuming your server was not plugged into any "surge protection" (non-UPS) plugs on the UPS.

1. Your power supply could have a defect and poor hold up time. If this is the case, it cannot survive the 3-5 mS that it takes a typical UPS to switch over to batteries. Hold Up time should be around 15mS or more.

2. The power supply's Power Factor Correction (PFC) might not be compatible with the "Modified Sine Wave" output of the UPS. I'll explain how this happens.

A typical UPS output looks like a square wave, with positive and negative components, and a short zero component in between. Exactly how the UPS matches the equivalent power of a true sign wave is up to the implementation. For example, it could hold a lower voltage of +/- 90V for a longer step time, or a higher voltage of 100V for a shorter step time. The average delivers the wattage advertised, assuming all is working to spec.

Modern PFC power supplies draw power at the top(bottom) of each sine wave, so as to draw less current than old-style transformer power supplies that draw large current amounts during the low voltage portion of the sine wave (leading and trailing edges). If the voltage of UPS "modified sine wave" is not high enough, some modern power supplies just don't see the "top" of the "sine wave" and shut off. So, the UPS is delivering the power, but the Power Supply is just not seeing it.

If you don't have the equipment to discern the problem, call HP and Eaton each and ask them if the other equipment is qualified to work together.