About Power Supplies

Figure 5-8  

A central power distribution board delivers DC power for all internal system components. The system's power supplies plug in to connectors on this board, and when both supplies are installed, they share equally in satisfying the power demands of the system.

Power supplies are modular units, designed for fast, easy installation or removal, even while the system is fully operational. Supplies are installed in bays at the rear of the system, as shown in the following figure.

Figure 5-9  

The system can accommodate one or two power supplies. Each supply provides up to 360 watts of DC power. All system configurations can operate with only one power supply installed. A second supply can be used to provide N+1 redundancy, allowing the system to continue operating should one of the power supplies fail.

Power supplies in a redundant configuration feature a "hot swap" capability. You can remove and replace a faulty power supply without turning off the system power or even shutting down the operating system.

When removing a hot-swappable power supply, do not disengage and reengage the supply in rapid succession. Always remove a supply completely before reinserting the same supply or a replacement supply. Rapid seating and unseating of power supplies may result in false error conditions.

For information about removing and installing power supplies, see "How to Remove a Power Supply" and "How to Install a Power Supply".

Two LED indicators on the rear of the power supply display power status and fault conditions. For additional details, see "Power Supply LEDs".

Enterprise 250 power supplies will shut down automatically in response to certain over-temperature and power fault conditions (see "Environmental Monitoring and Control"). To recover from an automatic shutdown, you must disconnect the AC power cord, wait roughly 10 seconds, and then reconnect the power cord.