Dell PowerEdge R910 Hardware Owner's Manual - Page 155
Removing a Power Supply, Power Supply Blank - rack chassis for up
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Table 3-5. Power Supply Redundancy Modes With a 1 GbE I/O Card Number of Power Supplies Redundancy Mode 1 1+0* 2 1+1* 2 2+0 3 2+1 4 2+2 *indicates that the system operates with a limited load. System Configuration Non-redundant configuration Redundant configuration Non-redundant configuration Redundant configuration Redundant configuration Removing a Power Supply CAUTION: The system requires one power supply to operate the system normally. On power-redundant systems, remove and replace only one power supply at a time in a system that is powered on. 1 Disconnect the power cable from the power source. 2 Disconnect the power cable from the power supply and remove the Velcro straps that bundle and secure the system cables. NOTE: You may have to unlatch and lift the optional cable management arm if it interferes with power-supply removal. For information about the cable management arm, see the system's rack documentation. 3 Pull the power supply straight out to release it from the power distribution board and clear the chassis. If you are permanently removing the power supply, you must install a power supply blank to ensure proper system cooling. See "Installing the Power Supply Blank" on page 157. Installing System Components 155