Chapter 2
Installing the System
Cabling and Powering On the Server
79
WARNING Do not set site AC circuit breakers serving the processor cabinets to ON
before verifying that the cabinet has been wired into the site AC power
supply correctly. Failure to do so can result in injury to personnel or
damage to equipment when AC power is applied to the cabinet.
Step 8. Set the site AC circuit breaker to
ON.
Step 9. Set the server power to ON.
Step 10. Check that the indicator light on each power supply is lit.
Connecting AC Input Power
The server can receive AC input from two different AC power sources. If two separate power sources are
available, the server can be plugged into the separate power sources, increasing system reliability if one
power source fails. The main power source is defined to be A0 and A1. The redundant power source is defined
to be B0 and B1. See Figure 2-26 for the AC power input label scheme.
NOTE When running the server with a single power source, use either A0 and A1 or B0 and B1. All
other combinations are not supported. Either combination requires two power cords.
Figure 2-26 AC Power Input Labeling
The power distribution for the bulk power supplies is as follows:
• A0 input provides power to BPS 0, BPS 1, and BPS 2
• A1 input provides power to BPS 3, BPS 4, and BPS 5
• B0 input provides power to BPS 0, BPS 1, and BPS 2
B1 A1
B0
A0
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