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CAUTION: The system requires 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.
NOTE: You may have to 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.
1. Disconnect the power wires from the power source and the connector from the PSU you intend to
remove.
2. Disconnect the safety ground wire.
3. Press the release latch and slide the PSU out of the chassis.
Figure 39. Removing and installing DC power supply unit
1. connector 2. PSU
3. PSU status indicator 4. release latch
5. PSU handle
Installing DC PSU
WARNING: For equipment using –(48–60) V DC 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.
1. Verify that both the PSUs are the same type and have the same maximum output power.
NOTE: The maximum output power (shown in Watts) is listed on the PSU label.
2. If applicable, remove the PSU blank.
3. Slide the new PSU into the chassis until the PSU is fully seated and the release latch snaps into place.
NOTE: If you unlatched the cable management arm, re-latch it. For information about the cable
management arm, see the system’s rack documentation.
4. Connect the safety ground wire.
5. Install the DC power connector in the PSU.
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