Dell PowerEdge 2900 - Manual (Page 62)

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Installing System Components
Power Supplies
Your system supports one or two power supplies rated at an output of 930 W. If only one power supply is
installed, it must be installed in the left power supply bay (1). If two power supplies are installed, the
second power supply serves as a redundant, hot-plug power source.
NOTICE:
To ensure proper system cooling, the power supply blank must be installed on the unoccupied power
supply bay in a non-redundant configuration.
Removing a Power Supply
NOTICE:
The system requires one power supply for the system to operate normally. The system is in the redundant
mode when two power supplies are installed and both power supplies are connected to an AC power source.
Remove and replace only one power supply at a time in a system that is powered on.
NOTE:
On a rack system, you may have to unlatch and lift the cable management arm if it interferes with power
supply removal. For information about the cable management arm, see the system’s Rack Installation Guide.
1 If your system has a single power supply, turn off the system and all attached peripherals. For a
redundant system, you can leave the system running and proceed to the next step.
2 Disconnect the power supply power cable from the power source.
3 Disconnect the power cable from the power supply and remove the cable from the cable retention
bracket.
4 Release the locking tab on the left side of the power supply, open the handle, and slide the power
supply out of the chassis. See Figure 3-10.