HP SAS DL360 - Manual (Page 51)

Hardware options installation 51
Redundant hot-plug AC power supply option
CAUTION: To prevent improper cooling and thermal damage,
do not operate the server unless all bays are populated with either a
component or a blank.
1. Unfasten the cable management solution to access the power supply bays.
2. Remove the power supply blank.
3. Remove the protective cover from the connector pins on the power supply.