Install Guide

AC power supply replacement

CAUTION: Disconnect the power cord before removing the power supplies. Also, disconnect all power cords before servicing.

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 eld 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 rst 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

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 at-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.

32 Power supplies