Setup Guide

The PSUs have an integrated fan, which you cannot replace individually; if the fans integrated in a PSU fails, you must replace the entire

PSU. You can replace the fan trays individually. For fan tray replacement procedures, refer to Fans.

WARNING: Prevent exposure and contact with hazardous voltages. Do not attempt to operate this switch with the safety cover

removed.

CAUTION: Remove the power cable from the PSU prior to removing the PSU. Also, do not connect the power cable before you

insert the PSU in the chassis.

NOTE: To comply with the GR-1089 Lightning Criteria for Equipment Interfacing with AC Power Ports, use an external surge

protection device (SPD) at the AC input of the router.

AC power supply installation

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 S4048–

ON chassis.

NOTE: Ensure that you correctly install the PSU. When you install the PSU correctly, the power connector is on the right side of

the PSU.

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 Remove the PSU slot cover from the S4048-ON.

2 Remove the PSU from the electro-static bag.

3 Insert the PSU into the switch PSU slot. Insert the PSU exposed PCB edge connector rst.

The PSU slot is keyed so that the PSU can only be fully inserted in one orientation.

Figure 13. PSU installation

a PSU

Power supplies