IBM 8681 Hardware Maintenance Manual - Page 100

Hot-swap power supply installation/removal Danger Overloading an electrical circuit breaker is potentially a fire hazard and a shock hazard under certain conditions. To avoid these hazards, adhere to the instructions in the following statements. 1. If you are connecting to a 100-127 V AC power source, connect each power cord to a separate branch circuit. 2. If you are connecting to a 200-240 V AC power source and the branch circuit breaker rating is: a. 13 amps or less, connect each power cord to a separate branch circuit. b. 14 amps to 19 amps, do not connect more than two power cords to the same branch circuit. c. 20 amps or greater, you may connect up to three power cords to the same branch circuit. The server comes with three power supplies, three 220 V AC power cords, and three 110 V AC power cords (U.S. only). Be sure to select the appropriate power cord voltage for the server environment. All three power cords must have the same voltage. If you connect the three: 220 V AC power cords to the power supplies, the three power supplies support redundancy and hot-swap capability. 110 V AC power cords to the power supplies, the three power supplies do not support redundancy if the system configuration exceeds any of these conditions: - More than six processors - More than 24 memory DIMMs - More than eight PCI adapters For servers with redundant power, the loss of a single power supply will not affect the server operation. Replace a power supply that has failed as soon as convenient to help maintain the redundant power and cooling capability. When the AC power LED is on, the DC power LED is on, and the System Power light on the operator panel is on, the power supply has failed. See "Hot-swap Power supplies" on page 80 for the location of the DC power LEDs. See "Power supply LED errors" on page 173 for more information on the DC power LEDs. 92 Netfinity Server HMM