Power Supplies; Removing A Power Supply - Dell DR4000 Owner's Manual

Power Supplies

Your system supports two 750 W redundant power supply modules.
NOTE:
The maximum output power (shown in Watts) is listed on the
power supply label.
Two power supplies are installed and the second power supply provides
hot-swappable, power redundancy. In redundant mode, the system
distributes the power load across both power supplies to maximize efficiency.
When a power supply is removed with the system powered on, the full power
load is picked up by the remaining power supply.
NOTE:
The system needs to run on both power supplies always, except when you
replace a power supply module.

Removing a Power Supply

CAUTION:
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 came
with the product.
CAUTION:
Remove and replace only one power supply at a time in a system that is powered
on.
1 Disconnect the power cable from the power source.
2 Disconnect the power cable from the power supply and remove the system
cables from the Velcro straps.
NOTE:
it interferes with power-supply removal. For information about the cable
management arm, see the system's rack documentation.
3 Press the lever release latch and slide the power supply out of the chassis.
See Figure 3-11.
74
Installing System Components
Many repairs may only be done by a certified service technician.
The system requires one power supply to operate the system normally.
You may have to unlatch and lift the optional cable management arm if