Dell POWEREDGE M915 - Manual (Page 288)

288 Installing Enclosure Components
NOTE: PDU inlet cords for this system may be too thick to fit in the wire guides
installed in the rack vertical rails. If this is the case, remove the wire guides by
removing the attachment screw securing each guide. Route the PDU inlet cords
along the vertical rails, securing them with tie wraps or Velcro strips.
Power Supply Blanks
If the M1000e enclosure is operated with only three power supplies, power
supply blanks must be installed in the three unoccupied power supply bays
(4 through 6) to maintain proper cooling airflow in the enclosure.
Removing a Power Supply Module
NOTE: The power supply modules are hot swappable. Remove and replace only
one power supply module at a time in a system that is turned on.
1 Release the power cord retention clip and disconnect the power cord from
the power supply module. See Figure 4-1.