HP Integrity rx7620 Server - User Service Guide, Sixth Edition

Figure 4-2 Power Source Versus Power Distribution
WARNING! Voltage is present at various locations within the server whenever a power source
is connected. This voltage is present even when the main power switch is in the off position. To
completely remove power, all power cords must be removed from the server. Failure to observe
this warning can result in personal injury or damage to equipment.
NOTE: System firmware will prevent boot when a single power cord configuration is detected.
DC Input Power
The HP Integrity rx7620 Server has two fast hot-pluggable DC bulk power supplies that provide
2N redundancy.
The power configuration is passed to the operating system using the pwrgrd (Power Grid)
command. Each of the four 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.
IMPORTANT: Options 1 and 2 are for HP internal use only. Do not select these options.
prompt> pwrgrd
Power grid configuration preference.
1. Grid A only (Cords A0,A1 required)
2. Grid B only (Cords B0,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.
Below is an illustration of the input power wiring.
56 Cable Connections