Connecting Ac Power To Multiple-Server Configurations - HP D5970A - NetServer - LCII User Manual

Chapter 2
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
If powering down
the system for service,
turn the power interlock
switch to this position.
Controls, Indicators, and Ports