Dell S4820T Installation Manual

Also see for S4820T: Manual Configuration guide Configuration guide

Contents

Dell S4820T Installation Manual Manual pdf 29 page image

5Power SuppliesThe S4820T supports two hot-swappable power supplies units (PSUs) with integrated fans that providecooling for the system.Power supply 0 (PSU0) is on the left side of the chassis; power supply 1 (PSU1) is on the right side of thechassis.Figure 9. S4820T with One AC PSU1. PSU02. PSU1The S4820T supports AC and DC power supplies with two air-flow directions (I/O to Utility and Utility toI/O). The S4820T does not support mixing PSU types. That is, you cannot replace an AC PSU with a DCPSU and an AC-R PSU with a DC-R PSU. The fan airflow direction for both the PSUs must be the same.Two PSUs are required for full redundancy, but the system can operate with a single PSU.NOTE: If you use a single PSU, install a blank plate in the other PSU slot. Dell Networkingrecommends using power supply 1 (PSU1) as the blank plate slot.When running with full redundancy (two power supplies installed and running), you can remove andreplace one PSU while the other PSU is running without disrupting traffic.The PSUs are in a single piece with the PSU fans. You can replace the fan trays individually, but youcannot replace the fans that are attached to the PSUs — if the fans attached to the PSU fail, you mustreplace the entire PSU. For fan tray replacement procedures, refer to Install Fans.Important Points to RememberThe S4820T supports two hot-swappable power supplies with integrated fans that provide cooling forthe chassis.• The PSU slides into the slot smoothly. Do not force the PSU into a slot as this action may damage thePSU or the S4820T chassis.• The S4820T supports AC and DC power supplies with two air-flow directions (I/O to Utility and Utilityto I/O). The S4820T does not support mixing PSU types. That is, you cannot replace an AC PSU with aPower Supplies 29