Dell EMC PowerEdge R740xd2, Installation And Service Manual

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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 .
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.
Step
Press the release latch and slide the PSU out of the system by using the PSU handle.
Next step
Replace the DC PSU .
Installing DC power supply unit
Prerequisites
WARNING: 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.
1 Follow the safety guidelines listed in Safety instructions .
2 For systems that support redundant power supply units (PSUs), ensure that both the PSUs are of the same type and have the same
maximum output power.
NOTE: The maximum output power (shown in watts) is listed on the PSU label.
Step
Slide the PSU into the system until the PSU is fully seated and the release latch snaps into place.
Next steps
1 Connect the safety ground wire.
2 Install the DC power connector in the PSU.
CAUTION: When connecting the power wires, ensure that you secure the wires with the strap to the PSU handle.
3 Connect the wires to a DC power source.
NOTE: When installing, hot-swapping, or hot-adding a new PSU, wait for 15 seconds for the system to recognize the
PSU and determine its status. The PSU status indicator turns green to signify that the PSU is functioning properly.
Power interposer board
Removing power interposer board
Prerequisites
1 Follow the safety guidelines listed in Safety instructions .
2 Power off the system and all attached peripherals.
3 Disconnect the system from the electrical outlet, and disconnect the peripherals.
4 Open the drive bays , remove all drives , and then close the drive bays.
5 Remove the power supply units .
6 Remove the system from the rack and place it on an ESD work bench. For more information, see the Rail Installation Guide available at
www.dell.com/poweredgemanuals .
Installing and removing system components 147