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NOTE:
When two identical PSUs are installed, power supply redundancy (1+1 – with 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.
CAUTION:
If two PSUs are used, they must be of the same type, and have the same maximum output power.
CAUTION:
If two PSUs are used, they must operate from the same AC linelevel or the system may report a PSU
mismatch.
Removing a power supply unit blank
Prerequisites
Follow the safety guidelines listed in
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 95. Removing a power supply unit blank
Next steps
Replace a power supply unit blank.
Installing a power supply unit blank
Prerequisites
1. Follow the safety guidelines listed in
NOTE:
If the system is using only one PSU, the PSU must be installed in PSU bay 1 and the PSU blank must be installed
in PSU bay 2.
Steps
Align the PSU blank with the PSU bay and push it into the PSU bay until it clicks into place.
90
PowerEdge C4140 installing and removing system components
Safety
instructions.
Safety
instructions.
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