Install Guide

NOTE: The PSU slides into the slot smoothly. Do not force a PSU into a slot as this action may damage the PSU or the
S4048T–ON chassis.
NOTE: If a PSU fails, you must replace the entire unit. There are no field serviceable components in the PSU. To request a
hardware replacement, see Dell Support.
NOTE: If you use a single PSU, install a blank plate in the other PSU slot. If you are only using one power supply, Dell EMC
recommends installing the power supply in the first slot, PSU1, and installing a blank plate in the second slot, PSU2.
1. Disconnect the power cable from the PSU.
2. Use the grab handle to slide the PSU out of the power supply bay.
3. Use the grab handle on the replacement PSU to slide it into the power supply bay.
4. Attach the power cord to the replacement PSU.
NOTE: The system powers up when you connect the cables between the power supply and the power source.
DC power supply connection
Each DC PSU kit, sold separately, comes with a connector cable.
Figure 18. DC power supply and connector cable
1.
DC PSU power socket 2. Cable connector with thumb screws
3. Cable connector wires—black, green, and blue 4. Wiring block
5. DC power source wires—black, green, blue
1. Strip 1/2 inches of insulation from each of the site’s DC power source wires, item 5.
2. Insert each of the site’s DC power source’s bare wire lengths into the wiring block, matching the wire colors, items 3 and 4.
WARNING:
Do not cross the wires—in the wiring block, blue aligns with blue, green aligns with green, and
black aligns with black.
3. Use a flat-blade screwdriver to tighten the screws that secure the bare wires into the wiring block.
4. Insert the DC power connector cable end into the power socket of the DC PSU and tighten the thumb screws, items 1 and 2.
WARNING: Never force the power connector into or out of the DC PSU power socket.
NOTE: To remove the power connector from a DC PSU, unscrew the thumb screws and pull the power connector from the
DC PSU socket.
28 Power supplies