Dell EMC PowerEdge R940xa Installation and Service Manual

Installing the power supply unit

Follow the safety guidelines listed in Safety instructions.
For systems that support redundant PSU, 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.

Slide the PSU into the system until the PSU is fully seated.
Release the latch to lock it into place.
Figure 1. Installing the power supply unit

If you have removed the strain relief bar and bracket, replace them. For information about the strain relief bar and bracket, see the Rail Installation Guide at Dell.com/poweredgemanuals.
Connect the power cable to the PSU, and plug the cable into a power outlet.
CAUTION When connecting the power cable to the PSU, secure the cable to the PSU with the strap.
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 redundancy may not occur until discovery is complete. Wait until the new PSU is discovered and enabled before you remove the other PSU. The PSU status indicator turns green to signify that the PSU is functioning properly.
Follow the procedure listed in After working inside your system.