Dell PowerEdge T440 EMC Installation and Service Manual - Page 124

Power supply units, Removing a power supply unit blank

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Power supply units NOTE: For more information, 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 will result in mismatch condition or failure to turn the system on. 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 in order to maximize efficiency. NOTE: If two PSUs are used, they must be of the same maximum output power. Removing a power supply unit blank Prerequisites Follow the safety guidelines listed in Safety instructions. Steps If you are installing a second power supply unit, remove the power supply unit blank in the bay by pulling the blank outward. CAUTION: To ensure proper system cooling, the power supply unit blank must be installed in the second power supply unit bay in a non-redundant configuration. Remove the power supply unit blank only if you are installing a second power supply unit. Figure 79. Removing a power supply unit blank Next steps Install the second power supply unit blank. Installing a power supply unit blank Prerequisites 1. Follow the safety guidelines listed in Safety instructions. NOTE: Install the power supply unit (PSU) blank only in the second PSU bay. Steps Align the PSU blank with the PSU slot and push it into the PSU slot until it clicks into place. 124 Installing and removing system components

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Power supply units
NOTE:
For more information, 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 will result in mismatch condition or failure to turn the system on.
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 in order to maximize efficiency.
NOTE:
If two PSUs are used, they must be of the same maximum output power.
Removing a power supply unit blank
Prerequisites
Follow the safety guidelines listed in
Safety instructions
.
Steps
If you are installing a second power supply unit, remove the power supply unit blank in the bay by pulling the blank outward.
CAUTION:
To ensure proper system cooling, the power supply unit blank must be installed in the second power supply
unit bay in a non-redundant configuration. Remove the power supply unit blank only if you are installing a second power
supply unit.
Figure 79. Removing a power supply unit blank
Next steps
Install the second power supply unit blank.
Installing a power supply unit blank
Prerequisites
1.
Follow the safety guidelines listed in
Safety instructions
.
NOTE:
Install the power supply unit (PSU) blank only in the second PSU bay.
Steps
Align the PSU blank with the PSU slot and push it into the PSU slot until it clicks into place.
124
Installing and removing system components