Dell PowerEdge T350 EMC Installation and Service Manual - Page 88

Power supply unit, Hot spare feature, Removing a power supply unit blank

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Steps Connect the USB memory key into the USB port. Next steps 1. Follow the procedure listed in After working inside your system. 2. While booting, press F2 to enter System Setup and verify that the system detects the USB memory key. 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 https://www.dell.com/idracmanuals. 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. You can configure the hot spare feature by using the iDRAC settings. For more information, see the iDRAC User's Guide available at www.dell.com/poweredgemanuals. Removing a power supply unit blank Prerequisites Follow the safety guidelines listed in the Safety instructions. Steps Pull the blank out of the system. CAUTION: For proper system cooling, the PSU blank must be installed in the second PSU bay in a non-redundant configuration. Remove the PSU blank only if you are installing a second PSU. 88 Installing and removing system components

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Steps
Connect the USB memory key into the USB port.
Next steps
1.
Follow the procedure listed in
After working inside your system
.
2.
While booting, press
F2
to enter
System Setup
and verify that the system detects the USB memory key.
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 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.
You can configure the hot spare feature by using the iDRAC settings. For more information, see the
iDRAC User’s Guide
available at
www.dell.com/poweredgemanuals
.
Removing a power supply unit blank
Prerequisites
Follow the safety guidelines listed in the
Safety instructions
.
Steps
Pull the blank out of the system.
CAUTION:
For proper system cooling, the PSU blank must be installed in the second PSU bay in a non-redundant
configuration. Remove the PSU blank only if you are installing a second PSU.
88
Installing and removing system components