Dell PowerEdge R840 EMC Installation and Service Manual - Page 131

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

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Power supply units The power supply unit (PSU) is an internal hardware component which supplies power to the components in the system. Your system supports one of the following: • Two 2400 W, 2000 W, 1600 W, 1100 W, or 750 W AC PSUs • Two 750 W DC PSUs (for China only) • Two 1100 W DC PSUs • Two 1100 W or 750 W (for China only) Mixed Mode HVDC PSUs NOTE: For more information about power supply units, see the Technical specifications section. CAUTION: If two PSUs are installed, both the PSUs must have the same type of label. For example, Extended Power Performance (EPP) label. Mixing PSUs from previous generations of PowerEdge servers is not supported, even if the PSUs have the same power rating. Mixing PSUs result in mismatch condition or failure to turn on the system. NOTE: When two identical PSUs are installed, power supply redundancy (1+1 - with redundancy or 2+0 - without redundancy) is configured in system BIOS. In redundant mode, power is supplied to the system equally from both PSUs when Hot Spare is disabled. When Hot Spare is enabled, one of the PSUs is put into the sleep mode when system utilization is low to maximize efficiency. NOTE: If two PSUs are used, they must be of the same maximum output power. NOTE: In a single PSU configuration, install the PSU in bay 1 (bottom PSU slot). 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 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, then the redundant PSU is switched to the active state. • If the load on the active PSU falls below 20 percent, 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 about iDRAC settings, see the Integrated Dell Remote Access Controller User's Guide available at www.dell.com/idracmanuals. Removing a power supply unit blank Prerequisites Follow the safety guidelines listed in Safety instructions on page 44. Steps If you are installing a second PSU, remove the PSU blank in the bay by pulling the blank outward. CAUTION: To ensure 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. Installing and removing system components 131

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Power supply units
The power supply unit (PSU) is an internal hardware component which supplies power to the components in the system.
Your system supports one of the following:
•
Two 2400 W, 2000 W, 1600 W, 1100 W, or 750 W AC PSUs
•
Two 750 W DC PSUs (for China only)
•
Two 1100 W DC PSUs
•
Two 1100 W or 750 W (for China only) Mixed Mode HVDC PSUs
NOTE:
For more information about power supply units, see the
Technical specifications
section.
CAUTION:
If two PSUs are installed, both the PSUs must have the same type of label. For example, Extended Power
Performance (EPP) label. Mixing PSUs from previous generations of PowerEdge servers is not supported, even if the
PSUs have the same power rating. Mixing PSUs result in mismatch condition or failure to turn on the system.
NOTE:
When two identical PSUs are installed, power supply redundancy (1+1 – with redundancy or 2+0 – without
redundancy) is configured in system BIOS. In redundant mode, power is supplied to the system equally from both PSUs
when Hot Spare is disabled. When Hot Spare is enabled, one of the PSUs is put into the sleep mode when system
utilization is low to maximize efficiency.
NOTE:
If two PSUs are used, they must be of the same maximum output power.
NOTE:
In a single PSU configuration, install the PSU in bay 1 (bottom PSU slot).
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 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, then the redundant PSU is switched to the active state.
•
If the load on the active PSU falls below 20 percent, 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 about iDRAC settings, see the
Integrated Dell
Remote Access Controller User’s Guide
available at
www.dell.com/idracmanuals
.
Removing a power supply unit blank
Prerequisites
Follow the safety guidelines listed in
Safety instructions
on page 44.
Steps
If you are installing a second PSU, remove the PSU blank in the bay by pulling the blank outward.
CAUTION:
To ensure 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.
Installing and removing system components
131