Install Guide

WARNING: Prevent exposure and contact with hazardous voltages. Do not attempt to operate this system with
the safety cover removed.
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 or DC Power Ports, use an
external surge protection device (SPD) at the AC or DC input of the switch.
AC power supply installation
NOTE: The PSU slides into the slot smoothly. Do not force a PSU into a slot as this action can damage the PSU or the
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: When using 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. Remove the PSU slot cover from the S4048T-ON system.
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 you can only insert the PSU in one orientation.
Figure 17. PSU installation
a. PSU
When you install the PSU correctly, it snaps into place and is flushed with the back of the switch.
4. Plug in the appropriate three-pronged AC 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 using the second PSU slot.
NOTE: The S4048T-ON powers up when you connect the cables between the power supply and the power source.
AC power supply replacement
CAUTION:
Disconnect the power cord before removing the power supplies. Also, disconnect all power cords
before servicing.
Power supplies 27