Dell PowerEdge R760 Installation and Service Manual - Page 288
Power supply unit, Hot spare feature
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Figure 239. Installing the OCP card Next steps 1. Install the expansion card riser. 2. Follow the procedure listed in After working inside your system. Power supply unit NOTE: While replacing the hot swappable PSU, after next server boot; the new PSU automatically updates to the same firmware and configuration of the replaced one. For updating to the latest firmware and changing the configuration, see the Lifecycle Controller User's Guide at https://www.dell.com/idracmanuals. NOTE: For information about DC PSU cabling instructions, go to https://www.dell.com/poweredgemanuals > Rack Servers > PowerEdge R760 > Select This Product > Documentation > Manuals and Documents > Cabling instructions for - 48 - 60 V DC power supply. Hot spare feature Your system supports the hot spare feature that significantly reduces the power overhead associated with the power supply unit (PSU) redundancy. When the hot spare feature is enabled, one of the redundant PSUs is switched to the sleep state. The active PSU supports 100 percent of the system load, thus operating at higher efficiency. The PSU in the sleep state monitors output voltage of the active PSU. If the output voltage of the active PSU drops, the PSU in the sleep state returns to an active output state. If having both PSUs active is more efficient than having one PSU in the sleep state, the active PSU can also activate the sleeping PSU. The default PSU settings are as follows: ● If the load on the active PSU is more than 50 percent of PSU rated power wattage, then the redundant PSU is switched to the active state. ● If the load on the active PSU falls below 20 percent of PSU rated power wattage, then the redundant PSU is switched to the sleep state. 288 Installing and removing system components