Owners Manual
Next steps
1 Install the SD card.
2 Follow the procedure listed in the After working inside your system section.
Related links
Safety instructions
Before working inside your system
After working inside your system
Power supply units
Your system supports 550 W AC (redundant) power supply units (PSUs).
When two identical PSUs are installed, the power supply conguration is redundant (1 + 1). In redundant mode, power is supplied to the
system equally from both PSUs to maximize eciency.
NOTE: If two PSUs are used, they must be of the same type and have the same maximum output power.
NOTE: For AC PSUs, use only PSU with the Extended Power Performance (EPP) label on the back.
Hot spare feature
Your system supports the hot spare feature that signicantly reduces the power overhead associated with power supply unit (PSU)
redundancy.
When the hot spare feature is enabled, one of the redundant PSUs is switched to the sleep state. The active PSU supports 100 percent of
the load, thus operating at higher eciency. The PSU in the sleep state monitors output voltage of the active PSU. If the output voltage of
the active PSU drops, the PSU in the sleep state returns to an active output state.
If having both PSUs active is more ecient than having one PSU in the sleep state, the active PSU can also activate the sleeping PSU.
The default PSU settings are as follows:
• If the load on the active PSU is more than 50 percent, then the redundant PSU is switched to the active state.
• If the load on the active PSU falls below 20 percent, then the redundant PSU is switched to the sleep state.
You can congure the hot spare feature by using the iDRAC settings. For more information about iDRAC settings, see the Integrated Dell
Remote Access Controller User’s Guide available at Dell.com/idracmanuals.
Removing a redundant power supply unit
Prerequisites
CAUTION
: The system requires one power supply unit (PSU) for normal operation. On power-redundant systems, remove and
replace only one PSU at a time in a system that is powered on.
1 Follow the safety guidelines listed in the Safety instructions section.
2 Disconnect the power cable from the power source.
3 Disconnect the power cable from the PSU and remove the straps that bundle and secure the system cables.
4 Unlatch and lift the optional cable management arm if it interferes with PSU removal. For information about the cable management
arm, see the systems rack documentation at Dell.com/poweredgemanuals.
Steps
Press the release latch, and pull the PSU out of the chassis.
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Installing and removing system components