We have a brand new S2600WTTR 2U rack mount server w/ 2 redundant PSUs. Each is connected to a 1500 UPS along w/ other equipment in the server rack (other Servers, Router Switches, NAS...) if power fails to a UPS the PSU looses power, LED turns Amber, while the other equipment remains operating. Both PSUs exhibit this behavior, and if there is a total power loss the server crashes. Tried on different USPs (4 in the Rack), even depopulated the UPS so the server is the only device connected. Is there a required power level that these PSUs need to remain active?