HP LH4r HP Netserver LXr Pro8 User Guide - Page 20

Chapter 2 Controls, Indicators, and Ports If powering down the system for service, turn the power interlock switch to this position. Figure 2-6. Power Interlock Switch in Unlocked Position NOTE After you unlock the power interlock switch, DC power is turned off for all components within the satellite chassis except for five volts at the system control board, which is located on the SCSI extender tray in the bottom of the system's lower board cage. If you undock the satellite chassis from the base chassis, no power is present at any internally- or externally-accessible area of the satellite. However, five volts are still present at the power supply connector where the satellite attaches to the base. To remove all power, unplug the AC power cord. Connecting AC Power to Multiple-Server Configurations When you connect the HP NetServer LXr Pro8 to an AC power source, the server temporarily draws a great deal of current. This occurs even when the system is in standby mode. This "inrush current" is much greater than the server's normal operating needs. Generally, your external AC power source can handle the inrush current. If you install several HP NetServer LXr Pro8s on one circuit, however, precautions are necessary. If there is a power failure and power is then restored, all the servers immediately begin to draw inrush current at the same time. If the circuit breakers on the incoming power line have insufficient capability, they may trip and thus prevent the servers from powering up. 12