Dell PowerEdge R540 EMC Installation and Service Manual - Page 154

Removing a DC power supply unit

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Figure 119. Installing non-redundant cabled AC PSU Next steps 1. Connect the PSU cables to the connectors on the system board. 2. If applicable, Installing an expansion card riser on page 126 3. Installing the air shroud on page 77 4. Follow the procedure listed in After working inside your system on page 67. Removing a DC power supply unit Prerequisites NOTE: For equipment using -(48-60) V DC power supply units (PSUs), a qualified electrician must perform all connections to DC power and to safety grounds. Do not attempt connecting to DC power or installing grounds yourself. All electrical wiring must comply with applicable local or national codes and practices. Damage due to servicing that is not authorized by Dell is not covered by your warranty. Read and follow all safety instructions that came with the product. CAUTION: The system needs one 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 Safety instructions on page 66. 2. Disconnect the power wires from the power source and the connector from the PSU you intend to remove. 3. Disconnect the safety ground wire. 4. Unlatch and lift the optional cable management arm if it interferes with PSU removal. For information about the cable management arm, see the system's rack documentation at www.dell.com/poweredgemanuals. Steps Press the release latch and slide the PSU out of the system by using the PSU handle. 154 Installing and removing system components

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Figure 119. Installing non-redundant cabled AC PSU
Next steps
1.
Connect the PSU cables to the connectors on the system board.
2.
If applicable,
Installing an expansion card riser
on page 126
3.
Installing the air shroud
on page 77
4.
Follow the procedure listed in
After working inside your system
on page 67.
Removing a DC power supply unit
Prerequisites
NOTE:
For equipment using –(48–60) V DC power supply units (PSUs), a qualified electrician must perform all
connections to DC power and to safety grounds. Do not attempt connecting to DC power or installing grounds yourself.
All electrical wiring must comply with applicable local or national codes and practices. Damage due to servicing that is
not authorized by Dell is not covered by your warranty. Read and follow all safety instructions that came with the
product.
CAUTION:
The system needs one 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
Safety instructions
on page 66.
2.
Disconnect the power wires from the power source and the connector from the PSU you intend to remove.
3.
Disconnect the safety ground wire.
4.
Unlatch and lift the optional cable management arm if it interferes with PSU removal. For information about the cable management
arm, see the system’s rack documentation at
www.dell.com/poweredgemanuals
.
Steps
Press the release latch and slide the PSU out of the system by using the PSU handle.
154
Installing and removing system components