Owners Manual
NOTE: When two identical PSUs are installed, power supply redundancy (1+1 – with redundancy or 2+0 – without redundancy) is
congured in system BIOS. In redundant mode, power is supplied to the system equally from both PSUs when Hot Spare is
disabled. When Hot Spare is enabled, one of the PSUs is put into the sleep mode when system utilization is low in order to
maximize eciency.
NOTE: If two PSUs are used, they must be of the same maximum output power.
Removing a power supply unit
The procedure for removing AC and DC PSUs is identical.
Prerequisites
CAUTION: The system needs one power supply unit (PSU) for normal operation. On power-redundant system, remove and
replace only one PSU at a time in a system that is powered on.
1 Follow the safety guidelines listed in Safety instructions.
2 Disconnect the power cable from the power source and from the PSU you intend to remove, and then remove the cable from the
strap on the PSU handle.
3 Unlatch and lift the optional cable management arm if it interferes with the PSU removal.
For information about the cable management arm, see the system’s rack documentation at Dell.com/XCSeriesmanuals.
Step
Press the release latch and slide the PSU out of the system by using the PSU handle.
Figure 70. Removing a power supply unit
Next step
Install the PSU or the PSU blank.
Installing and removing system components
117