Dell PowerVault 221S (SCSI) - Manual (Page 32)

Troubleshooting: Dell PowerVault 220S and 221S Systems Installation and Troubleshooting Guide
file:///C|/Users/rishi_sood/Desktop/220s/en/it/6f704c51.htm[3/7/2013 12:07:22 PM]
remove one of the two power supplies while the system is turned on. If you have a system with only one power
supply, you must turn off the system before replacing the power supply (see " Replacing a Power Supply in Systems
With Nonredundant Power Supplies ").
NOTE: When a power supply fails in systems using redundant power supplies, the fan speed of the cooling module
attached to the redundant power supply increases to provide additional cooling. However, if you are removing a fully
functioning power supply, the fan speed of the cooling module attached to the redundant power supply will increase
when the power supply that is being removed is turned off or unplugged, and will decrease when it is removed from the
system.
1. Using a Phillips-head screwdriver, turn the two captive screws counterclockwise to release the power supply and
cooling module from the module bay (see Figure 5-5 ).
Figure 5-5. Replacing the Power Supply (Systems With Redundant Power Supplies)
CAUTION: The power supply and cooling modules are heavy. Use both hands when removing.
2. Grasp the handle on the power supply and carefully pull the power supply and cooling module out of the module bay
(see Figure 5-5 ).
NOTICE: The power-supply handle is provided to ease the task of pulling the power supply free from the bay. Do not
use this handle to carry the storage system.
3. Detach the cooling module from the power supply by pressing the tab on the back of the cooling module and sliding the
cooling module back and up (see Figure 5-6 ).
Figure 5-6. Detaching the Cooling Module From the Power Supply