Cabling And Powering The Server; Ac Input Power; Power Cord Configuration - HP rp7420 Service Manual

4 Cabling and Powering the Server

After you have unpacked the server and moved into position, you must be connect it to an AC
power source. Check the AC power for the proper voltage before you power the system on. This
chapter describes these activities.

AC Input Power

The server has the following line-cord configurations:
• All four line cords (preferred configuration)
• Cords A0 and A1 only
• Cords B0 and B1 only
• Cords A0 and B0 only
• Cords A1 and B1 only
A single-line-cord configuration is not allowed.
Figure 4-1 Power Cord Configuration
The power cord configuration is passed to the operating system using the pwrgrd (Power Grid)
command. Each of the five selections in the pwrgrd command matches one of the configurations.
The appropriate option should be selected for the actual line cord configuration. With the correct
configuration selected, the LEDs should be green. When the pwrgrd command is invoked, the
following menu displays:
prompt> pwrgrd
Power grid configuration preference.
1. Grid A only (Cords A0,B0 required)
2. Grid B only (Cords A1,B1 required)
3. Grids A & B (Cords A0,A1,B0,B1 required)
4. Cords A0 & B0 only5. Cords A1 & B1 only
Select Option:
If two separate power sources are available, the two power supplies can be plugged into the
separate power sources, increasing system reliability should one power source fail.
AC Input Power 51