CAUTION: Remove the power cable from the PSU before 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
Technologies recommends installing the power supply in the first 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 first.
The PSU slot is keyed so that the PSU can only be fully inserted in one orientation.
Figure 13. PSU installation
a. PSU
b. Slot
When you install the PSU correctly, it snaps into place and is flushed with the back of the switch.
4. Plug in the appropriate AC three prong power cord from the switch PSU to the external power source.
5. If you have a redundant PSU, a second PSU, repeat steps 1 through 4 above using the second PSU slot on the S4048-ON
switch.
NOTE: The S4048-ON powers up when the cables are connected between the power supply and the power source.
Power supplies 25
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