Dell PowerEdge M1000e Technical Manual

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Dell PowerEdge M1000e Technical Manual Manual pdf 36 page image

36 PowerEdge M1000e Technical GuideFigure 19. M1000e power supplyDell power supplies use output ORing FETs to isolate the power supply from the 12V system bus. If asingle power supply fails its output ORing FET, the power supply will turn off removing itself fromthe bus like an electrical switch that turns off when the power supply fails.When DPSE is enabled, the PSU units move between on and off states depending on actual powerdraw conditions to achieve high power efficiency.In the N+N power supply configuration, a system provides protection against AC grid loss or powersupply failures. If one power grid fails, three power supplies lose their AC source, and the threepower supplies on the other grid remain powered, providing sufficient power for the system tocontinue running. In the N+1 configuration, only power supply failures are protected, not gridfailures. The likelihood of multiple power supplies failing at the same time is remote. In the N+0configuration, there is no power protection and any protection must be provided at the node orchassis level. Typically this case is an HPCC or other clustered environment where redundant poweris not a concern, since the parallelism of the processing nodes across multiple system chassisprovides all the redundancy that is necessary.The midplane carries all 12V DC power for the system, both main power and standby power. TheCMCs, LCD and control panel are powered solely by 12V standby power, ensuring that chassis levelmanagement is operational in the chassis standby state, whenever AC power is present. The servermodules, I/O modules, fans and iKVM are powered solely by 12V main power.