AC power supply replacement
CAUTION: Disconnect the power cable before removing the power supplies. Also, disconnect all power cables
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
S4048–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 Technical 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
Technologies 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 cable to the replacement PSU.
NOTE: The switch powers up when the cables are connected between the power supply and the power source.
DC power supply installation
CAUTION:
To prevent electrical shock, ensure that the S4048-ON is grounded properly. If you do not ground
your equipment correctly, excessive emissions may result. Use a qualified electrician to ensure that the power
cables meet your local electrical requirements.
WARNING: The switch must have either AC power supplies or DC power supplies. You cannot mix power
supplies.
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: 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).
NOTE: ESD damage can occur if components are mishandled. Always wear an ESD-preventive wrist or heel ground strap
when handling the S4048–ON and its components.
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, contact Technical Support at www.dell.com/support.
Figure 14. S4048–ON DC power supplies
1. Power supply 1
2. Power supply 2
1. Remove the PSU slot cover from the S4048-ON.
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Power supplies
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