Installing a hot-swap dc power supplyObserve the following precautions when you install a hot-swap dc power supply.The following notes describe the type of power supply that the server supportsand other information that you must consider when you install a power supply:v Before you install an additional power supply or replace a power supply withone of a different wattage, you may use the IBM Power Configurator utility todetermine current system power consumption. For more information and todownload the utility, go to http://www.ibm.com/systems/bladecenter/resources/powerconfig.html.v The server comes with one hot-swap 12-volt output power supply that connectsto power supply bay 1. The input voltage is -48 V dc or -60 V dc auto-sensing.v Before you install a dc power supply in the server, you must remove all acpower supplies. Do not use both ac and dc power supplies in the same server.Install up to two dc power supplies or up to two ac power supplies, but not acombination.v Power supply 1 is the default/primary power supply. If power supply 1 fails,you must replace the power supply with the same wattage 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 thesystem. The server supports a maximum of two power supplies.Regulationsv It is the customer's responsibility to supply the necessary power cable.To reduce the risk of electric shock or energy hazards:– Use a circuit breaker that is rated at 25 amps.– Use 2.5 mm 2 (12 AWG) at 90°C copper wire.– Torque the wiring-terminal screws to 0.50 ~ 0.60 newton-meters (4.43 ~ 5.31inch-pounds).For more information, see “Statement 34” on page 78.v If the power source requires ring terminals, you must use a crimping tool toinstall the ring terminals to the power cord wires. The ring terminals must beUL approved and must accommodate the wire that is described in theabove-mentioned note .Statement 29CAUTION:This equipment is designed to permit the connection of the earthed conductor ofthe dc supply circuit to the earthing conductor at the equipment.This equipment is designed to permit the connection of the earthed conductor ofthe dc supply circuit to the earthing conductor at the equipment. If this connectionis made, all of the following conditions must be met:Chapter 2. Installing optional devices 75
