Dell PowerEdge R740xd2 EMC Installation and Service Manual - Page 134

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

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Figure 117. Installing the internal USB memory key a. USB memory key b. USB port Next steps 1. If removed, install the low profile expansion card riser. 2. If removed, install the air shroud. 3. Install the system cover. 4. Place the system into the rack. For more information, see the Rail Installation Guide available at www.dell.com/poweredgemanuals. 5. Open the drive bays, install all drives, and then close the drive bays. 6. Install the power supply units. 7. Follow the procedure listed in After working inside your system. 8. While booting, press F2 to enter System Setup and verify that the system detects the USB memory key. Power supply units NOTE: For more information, see the PSU specifications section. 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. Steps If you are installing a second power supply unit, remove the power supply unit blank in the bay by pulling the blank outward. 134 Installing and removing system components

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Figure 117. Installing the internal USB memory key
a.
USB memory key
b.
USB port
Next steps
1.
If removed,
install the low profile expansion card riser
.
2.
If removed,
install the air shroud.
3.
Install
the system cover
.
4.
Place the system into the rack. For more information, see the
Rail Installation Guide
available at
www.dell.com/poweredgemanuals
.
5.
Open the drive bays
, install
all drives
, and then
close the drive bays.
6.
Install the
power supply units
.
7.
Follow the procedure listed in
After working inside your system
.
8.
While booting, press F2 to enter
System Setup
and verify that the system detects the USB memory key.
Power supply units
NOTE:
For more information, see the
PSU specifications
section.
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
.
Steps
If you are installing a second power supply unit, remove the power supply unit blank in the bay by pulling the blank outward.
134
Installing and removing system components