Power Supply Units - Dell EMC PowerEdge R540 Installation And Service Manual

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Figure 105. Installing the optical drive
Next steps
1
Connect the power and data cables to the connector on the optical drive and the connector on the system board.
NOTE:
Route the cable properly on the side of the system to prevent it from being pinched or crimped.
2
Follow the procedure listed in

Power supply units

The power supply unit (PSU) is an internal hardware component which supplies power to the components in the system.
Your system supports one of the following:
Two 1100 W, 750 W, or 495 W AC PSUs
Two 1100 W DC PSUs
Two 1100 W or 750 W Mixed Mode HVDC PSUs
One 450 W cabled AC PSU
NOTE:
For more information, see the Technical specifications
section.
CAUTION:
If two PSUs are installed, both the PSUs must have the same type of label. For example, Extended Power
Performance (EPP) label. Mixing PSUs from previous generations of PowerEdge servers is not supported, even if the PSUs have
the same power rating. Mixing PSUs will result in mismatch condition or failure to turn the system on.
NOTE:
When two identical PSUs are installed, power supply redundancy (1+1 – with redundancy or 2+0 – without redundancy) is
configured 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 efficiency.
NOTE:
If two PSUs are used, they must be of the same maximum output power.
148
Installing and removing system components
After working inside your
system.

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