cord. During normal operation, both the ac and the dc power LEDs are lit. Forany other combination of LEDs, see “Power-supply LEDs” on page 179. Makesure that no error LEDs are lit.9. Restart the server. Confirm that it starts correctly and recognizes the newlyinstalled device, and make sure that no error LEDs are lit.Installing a 750-watt -48 volt to -60 volt dc power supplyUse the information for instructions on installing a 750-watt -48 volt dc powersupply.About this taskThe following notes provides information that you must consider when you installa 750-watt -48 V to -60 V dc power supply. To confirm that the server supports thepower supply that you are installing, see http://www.ibm.com/systems/info/x86servers/serverproven/compat/us/.Attention:v Only trained service technicians, other than IBM service technicians, areauthorized to install and remove the 750-watt -48 V to -60 V dc power supply,and make connections to or disconnections from the 750-watt -48 V to -60 V dcpower source.v IBM service technicians are not certified or authorized to install or remove the750-watt -48 V to -60 V dc power cable. You are responsible for ensuring thatonly a trained service technician install or remove the 750-watt -48 V to -60 V dcpower cable.v You can install up to two dc power supplies or two ac power supplies in theserver, but you cannot mix dc and ac power supplies in the same server.v To reduce the risk of electric shock or energy hazards when installing the750-watt -48 V to -60 V dc power supplies, take the following steps:– Use a circuit breaker that is rated 40 amps.– Use 4 mm2 (10 AWG) at 60° C copper wire.– Cut the power cable wires to the correct length, but do not cut the wiresshorter than 150 mm (6 inches).– Torque the wiring-terminal screws to 0.50 ~ 0.60 newton-meters (4.43 ~ 5.31inch-pounds).v For the server to support two power supplies, you must install the optional IBMPower Interposer for Redundant Power option or the optional IBMMicroprocessor and Memory Expansion Tray, if one is not installed in yourmodel.Chapter 2. Installing optional devices 105
