HPE ProLiant DL20 Gen10 Plus User Manual page 84

11. Immediately slide the power supply into the bay until it clicks into place.
12. Make sure the -48 V DC power source is off or the PDU breaker is in the off position, and then connect the power cord to the -
48 V DC power source or PDU.
13. Turn on the -48 V power source or switch the PDU breaker to the on position to supply -48 V to the power supply.
14. Make sure that the power supply LED is green.
The installation is complete.
Installing a DC power supply 84