Dell PowerEdge R540 EMC Installation and Service Manual - Page 149

Installing the optical drive, Power supply units

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Installing the optical drive Prerequisites Follow the safety guidelines listed in Safety instructions on page 66. Steps 1. Align the optical drive with the optical drive slot on the front of the system. 2. Slide in the optical drive until the release tab snaps into place. Figure 113. 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 After working inside your system on page 67. Power supply units 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. Installing and removing system components 149

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Installing the optical drive
Prerequisites
Follow the safety guidelines listed in
Safety instructions
on page 66.
Steps
1.
Align the optical drive with the optical drive slot on the front of the system.
2.
Slide in the optical drive until the release tab snaps into place.
Figure 113. 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
After working inside your system
on page 67.
Power supply units
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.
Installing and removing system components
149