DR4300 Owners Manual
Removing the power supply unit blank
127
CAUTION:
For AC PSUs, use only PSUs with the Extended Power Performance (EPP) label on the
back. Mixing PSUs from previous generations of systems can result in a PSU mismatch condition
or failure to turn on.
NOTE:
Titanium PSU is nominally rated for 200 V AC to 240 V AC input only.
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 will be
put into standby 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.
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
Dell.com/idracmanuals
.
Removing the power supply unit blank
Install the power supply unit (PSU) blank only in the second PSU bay.
CAUTION:
Many repairs may only be done by a certified service technician. You should only
perform troubleshooting and simple repairs as authorized in your product documentation, or as
directed by the online or telephone service and support team. Damage due to servicing that is not
authorized by Dell is not covered by your warranty. Read and follow the safety instructions that are
shipped with your product.
Follow the safety guidelines listed in the Safety instructions section.
1. If you are installing a second power supply unit (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.
Figure 57. Removing the PSU blank
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