12 Installation
Power Supplies
The S4820T supports two hot-swappable power supplies units (PSUs) and fans
that provide cooling for the system. The S4820T supports AC and DC power
supplies with two air-flow directions (I/O to PSU and PSU to I/O). Two PSUs
are required for full redundancy, but the system will operate with a single PSU.
NOTE: If you use a single PSU, you must install a blank plate in the other PSU
slot. Dell Force10 recommends using power supply 1 (PSU1) as the blank plate
slot.
The PSUs are field replaceable. When running with full redundancy (two power
supplies installed and running), you can remove and replace one PSU while the
other PSU is running without disrupting traffic.
The S4820T does not support mixing PSU types. You cannot replace an AC
PSU with a DC PSU and you cannot replace an AC-R PSU with a DC-R PSU.
WARNING: Electrostatic discharge (ESD) damage can occur if components
are mishandled. Always wear an ESD-preventive wrist or heel ground strap
when handling the S4820T and its components.
CAUTION: To prevent electrical shock, ensure the S4820T is grounded
properly. If you do not ground your equipment correctly, excessive emissions
may result. Use a qualified electrician to ensure the power cables meet your
local electrical requirements.
Figure 1-4. S4820T Power Supply
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