Hot Spare Feature; Removing An Ac Power Supply - Dell EMC PowerEdge R620 Owner's Manual

Hot Spare Feature

Your system supports the Hot Spare feature that significantly reduces the power overhead associated with power supply redundancy.
When the Hot Spare feature is enabled, a redundant power supply is switched to a sleep state. The active power supply supports 100% of
the load, thus operating at higher efficiency. The redundant power supply in the sleep state monitors output voltage of the active power
supply. If the output voltage of the active power supply drops, the redundant power supply in the sleep state returns to an active output
state.
The active power supply can also activate a sleeping power supply if having both power supplies active is more efficient than having the
redundant power supply in a sleep state. The power supply defaults are to wake both power supplies if the load on the active power supply
is greater than 50% and to sleep the redundant power supply if the load falls below 20%.
You can configure the Hot Spare feature using the iDRAC settings. For more information on iDRAC settings, see the iDRAC7 User's Guide
at dell.com/support/manuals.

Removing an AC power supply

CAUTION: Many repairs may only be done by a certified service technician. You should only perform troubleshooting and simple
repairs as authorized in your product documentation, or as directed by the online or telephone service and support team.
Damage due to servicing that is not authorized by Dell is not covered by your warranty. Read and follow the safety instructions
that are shipped with your product.
CAUTION: The system requires one power supply for normal operation. On power-redundant systems, remove and replace only
one power supply at a time in a system that is powered on.
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.
1 Disconnect the power cable from the power source and the power supply you intend to remove and remove the cables from the strap.
2 Press the release latch and slide the power supply out of the chassis.
Figure 38. Removing and Installing an AC Power Supply
1 connector 2 power supply
Installing and removing system components 73