Dell EMC PowerEdge R940xa - Power Supply Units

Power supply units
Energy Smart power supplies have intelligent features, such as the ability to dynamically optimize eciency while maintaining
availability and redundancy. Also featured are enhanced power-consumption reduction technologies, such as high-eciency power
conversion and advanced thermal-management techniques, and embedded power-management features, including high-accuracy
power monitoring
The table below shows the power supply unit options that are available for R940xa:
Wattage Frequency Voltage Class Heat dissipation
1100W DC - '-48--60Vdc/32A N/A 4416 BTU/hr
1100W 50/60Hz 100-240Vac/12-6.5A Platinum 4100 BTU/hr
1100W Mix Mode/
HVDC(China and Japan
Only)
50/60Hz 100-240Vac/12A-6.5A Platinum 4100 BTU/hr
N/A 200-380Vdc/6.4A-3.2A N/A 4100 BTU/hr
1600W 50/60Hz 100-240Vac/10A Platinum 6000 BTU/hr
2000W 50/60Hz 100-240Vac/11.5A Platinum 7500 BTU/hr
2400W 50/60Hz 100-240Vac/16A Platinum 9000 BTU/hr
NOTE: If a system with AC 1100 W PSUs operate at low line 100-120 Vac, then the power rating per PSU is derated to
1050 W.
NOTE: If a system with AC 1600 W PSUs operate at low line 100-120 Vac, then the power rating per PSU is derated to
800 W.
NOTE: If a system with AC 2000 W PSUs operate at low line 100-120 Vac, then the power rating per PSU is derated to
1000 W.
The PowerEdge R940xa support up to 2 AC or DC power supplies with 1+1 redundancy, auto sensing, and auto-switching capability.
If two PSUs are present during POST, a comparison is made between the wattage capacities of the PSUs. In the event that the PSU
wattages don't match, the larger of the two PSU's is enabled. Also, there is a PSU mismatch warning displayed in BIOS, iDRAC, or on
the System LCD.
If a second PSU is added at run-time, in order for that particular PSU to be enabled, the wattage capacity of the rst PSU must
equal the second PSU. Otherwise, the PSU will be agged as unmatched in iDRAC and the second PSU will not be enabled
Dell EMC PSUs have achieved Platinum and Titanium eciency levels as shown in the table below:
Table 18. PSU eciency level
Form factor Eciency target by load
Output Class 10 20 50 100
Redundant
86mm
1100W AC Platinum 89.00% 93.00% 94.50% 92.00%
1100W DC Gold 0.00% 88.00% 91.00% 88.00%
1600W AC Platinum 87.00% 90.00% 94.00% 91.00%
2000W AC Platinum 89.00% 93.0 0% 94.00% 91.00%
2400W AC Platinum 89.00% 93.0 0% 94.00% 92.00%
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