Power Supply Unit; Hot Spare Feature - Dell EMC PowerEdge R7515 Installation And Service Manual

Figure 117. Installing optical drive
Next steps
1. Connect the power and data cables to the connector on the optical drive and the connector on the system board.
NOTE: Route the cable properly on the side of the system to prevent it from being pinched or crimped.
2. If removed, install the front
3. If applicable, install the backplane
4. Follow the procedure listed in

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 more information about the Part replacement configuration, see the
Lifecycle Controller User's Guide at

Hot spare feature

Your system supports the hot spare feature that significantly reduces the power overhead associated with 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.
bezel.
cover.
After working inside your system
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on page 27.
Installing and removing system components 109