Dell POWEREDGE 1955 - Manual (Page 58)

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Installing System Options
Power Supply Modules
Your system contains up to four hot-pluggable power supply modules that are accessible from the system
chassis back panel.
NOTE:
Only 2100-W power supply modules are supported on your system. The 2100-W power supply modules
require 180–240 V input from a PDU capable of providing AC current up to 29.2 A at 180 V input. If the power supply
modules are plugged into 110-V electrical outlets, the system will not power up.
NOTE:
In addition to supplying power to the system, the power supply modules also have internal fans that provide
thermal cooling for the server modules. A power supply module must be replaced if an internal fan failure occurs.
System Power Guidelines
The Dell Remote Access Controller/Modular Chassis (DRAC/MC) module controls the power
distribution to the chassis and the server modules. The DRAC/MC is programmed to allocate the
theoretical maximum power of a chassis with all back-panel modules installed and the theoretical
maximum power of a fully-loaded server module for power management and protection purposes. Actual
power usage depends on a system’s particular configuration; for example, the number of modules
installed in the chassis back panel; the number of processors, memory modules, and hard drives installed
in a server module; and the number of server modules installed in the chassis.
The number of installed power supply modules determine if your system is redundant. Your system has
one of the following configurations:
• Two 2100-W power supply modules, which do not provide redundancy if one power supply module
fails
• Four 2100-W power supply modules, which provide redundancy if one power supply module fails
NOTE:
Depending on a non-redundant system’s particular configuration, it is possible for some of the server
modules to continue to operate even though a power supply module fails. If this occurs, and the server module that
you want to operate is off, then power down the operating server modules until the desired server module
powers up.
In addition, if you install a new server module and it does not power up, ensure that your system meets the normal
operating-power configurations listed above. Only those configurations support a fully-loaded system.
NOTE:
The wattage of a power supply module is listed on its regulatory label.
Removing a Power Supply Module
NOTICE:
The power supply modules are hot-pluggable. Remove and replace only one power supply module at a
time in a system that is turned on.
1 Disconnect the power cord from the power supply module.
2 Press down on the power supply module release tab. See Figure 3-1.
3 Rotate the power supply module handle down to eject the power supply module.
4 Slide the power supply module out of the chassis.