If you have other options to install or remove, do so now. Otherwise, go to“Completing the installation” on page 85.Installing a hot-swap ac power supplyThe following notes describe the type of ac power supply that the server supportsand other information that you must consider when you install a power supply:v The server comes with one 675-watt hot-swap 12-volt output power supply thatconnects to power supply bay 1. The input voltage is 110 V ac or 220 V acauto-sensing.v Power supply 1 is the default/primary power supply. If power supply 1 fails, youmust replace the power supply immediately.v You can order an optional power supply for redundancy.v These power supplies are designed for parallel operation. In the event of apower-supply failure, the redundant power supply continues to power the system.The server supports a maximum of two power supplies.v For instructions on how to install a hot-swap dc power supply, refer to thedocumentation that comes with the dc power supply.Statement 5:CAUTION:The power control button on the device and the power switch on the powersupply do not turn off the electrical current supplied to the device. The devicealso might have more than one power cord. To remove all electrical currentfrom the device, ensure that all power cords are disconnected from the powersource.12Statement 878 IBM System x3550 M2 Types 4198 and 7946: Installation and User’s Guide
