Technical Guide

Table 22. PSUs Highline and Lowline ratings (continued)
600 W Platinum 800 W Platinum DC 1100 W
Lowline/-40 VDC 600 W 800 W 1100 W
Highline 240 VDC 600 W 800 W N/A
Highline 200-380 VDC N/A N/A N/A
DC -48-60 V N/A N/A 1100 W
The PowerEdge R550 supports up to 2 AC or DC power supplies with 1+1 redundancy, autosensing 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 first PSU must
equal the second PSU. Otherwise, the PSU will be flagged as unmatched in iDRAC and the second PSU will not be enabled.
Dell PSUs have achieved Platinum efficiency levels as shown in the table below.
Table 23. PSU efficiency levels
Efficiency Targets by Load
Form factor Output Class 10% 20% 50% 100%
Redundant 60
mm
600 W AC Platinum 89.00% 93.00% 94.00% 91.50%
800 W AC Platinum 89.00% 93.00% 94.00% 91.50%
1100 W DC N/A 85.00% 90.00% 92.00% 90.00%
Environmental specifications
The table below details the environmental specifications for the platform. For additional information about environmental
measurements for specific system configurations, see https://www.dell.com/learn/us/en/uscorp1/product-info-datasheets-
safety-emc-environmental .
An important feature of having a broad menu of different categories is to allow the same platform model to have different
operational ranges depending on the MRD defined.
A list of range categories for different configurations shall be identified by thermal team as early in the project as possible.
Post release, see the Dell EMC PowerEdge Technical Specifications at https://www.dell.com/support/home/en-in//products/
server_int/server_int_poweredge.
Table 24. Operational Climatic Range Categories
Category A2 Allowable Operation
Temperature Ranges (For Altitude <900 meters or 2953 feet) 10 to 35°C (50 to 95°F) with no direct sunlight on the
platform
Humidity Percent Ranges (Non-Condensing at all times) 8%RH with -12°C minimum dew point to 80%RH with 21°C
(69.8°F) maximum dew point
Operational Altitude De-Rating Maximum temperature is reduced by 1°C/300 meters
(1.8°F/984 feet) above 900 meters (2,953 feet)
Table 25. Operational Climatic Range Categories
Category A3 Allowable Operation
Temperature Ranges (For Altitude <900 meters or 2953 feet) 5 to 40°C (41 to 104°F) with no direct sunlight on the
platform
Appendix A: Additional specifications 43