Dell PowerConnect W-7200 Series Controller Installation Guide - Page 17

Figure 8 Air Flow Pattern Power Supply CAUTION: Never insert or remove a power supply while the power cord is connected. Verify that cord has been disconnected from the power supply before installation or removal. The W-7200 series controller's Power Supply adapts electrical power for use with the W-7200. The chassis has two slots that can hold individual power supplies to support load sharing, redundancy, and fault tolerance. The W-7200 controller comes equipped with a single 350W AC power supply. The W-7200 controller is shipped with one hot-swappable, field-replaceable, AC power supply and one blank face plate. The included power supply is installed in the slot PSU 0, while slot PSU 1 has a blank face plate covering the opening. The controller can operate with one or two active power supplies, depending on the demands of your configuration. Load Sharing Load sharing occurs when more than one power supply of the same rating is installed in the W-7200 controller and turned on. Load sharing divides the total power load of the controller among all available power supplies. Since the power supplies work together, the effective power capacity of the controller is increased with each additional power supply. Redundancy With power redundancy, the W-7200 controller can continue normal operation even when a power supply fails or is turned off. When multiple power supplies are installed, if one becomes unavailable (fails, or is turned off or removed) the remaining power supplies will attempt to provide full power for the device. If the device's total power load does not exceed the combined rated output of the remaining, operational power supplies, the controller will continue to operate. Hot Swapping Hot swapping allows you to replace one failed power supply while the others provide full power. This makes it unnecessary to shut down the W-7200 controller during the replacement procedure. Hot swapping is supported only when power redundancy is in effect. This requires that after the target power supply is removed, the device's total power load does not exceed the combined rated output of the remaining power supplies Dell PowerConnect W-7200 Series Controller | Installation Guide Dell PowerConnect W-7200 Controller | 17