User Service Guide, Fifth Edition - HP Integrity rx8640 SEU

Bulk Power Supplies
The power subsystem is comprised of two bulk power supplies (BPS) and the power distribution
Unit (PDU).. When properly loaded the BPS provide N+1 redundancy. The BPS and the PDU
are in the bottom of the server chassis
Each BPS has a power good LED on the front of the supply. Additionaly the system monitors
and reports the current power contidion to the server. Use the ps command to view the current
power status.
The following types of faults can occur:
• Faults in the BPSs, several in parallel
• AC input faults
• Housekeeping power faults
• 48 V bus faults
Table 4-8 lists power subsystem symptoms and actions to take to correct the problem.
Table 4-8 Power Troubleshooting
ActionSymptom
Power problems may be generally isolated to the input source,
the BPS or the DC distribution paths. Visual inspections for LED
indications and the use of the "ps" command should pinpoint
the failing FRU.
When troubleshooting power, LED indications, the MP "ps"
command, and the Error Log are your most useful tools.
Common power failure indications:- System will
not power up.- Power supply fault LED may be
lighted.- Front panel LED not lighted.- No LED
lights "on" anywhere.- Error log indicates a power
error - read the log with the MP.
Check chassis codes for fault reporting time stamp. If more than
one failure occurs within a short period of time, there exists a
significant probability that the root cause is outside the power
subsystem and the BPS failure is an artifact of the root cause.
Probable cause and or symptoms to look for outside the power
subsystem are, , blocked airflow for the failed BPS's, ambient
conditions beyond limits and AC input beyond limits.
48V Fault reported
3.3V Fault reported
12V Fault reported
Fan Fault and/or OverTemp 0 or 1 Fault reported
PM will NOT turn on 48V under the following conditions: - N-
main fans present - N- I/O fans present - N- Bulk Power Supplies
detected state - PM POST fails - Power Switch OFF - Ambient
inlet temp reading is OverTempHigh (Over 40C) - Invalid BPS
ID detected
PM will NOT turn on 48V
PM will shut down 48V to the cabinet under the following
conditions:- Ambient OverTempHigh (Over 40C)- N- Fans
Present and Working- N- I/O Fans Present and Working in a
CPU cabinet- Service Processor 48V_Off command or PM reset-
Power Switch OFF
PM is shutting down 48V to the cabinet
IO Chassis Power
Power for the PCI-X I/O chassis (48 V and 3.3 V housekeeping and 12 V housekeeping) is provided
by the PCI-X power supplies located at the front of the server. These two DC-to-DC converters
provide N+1 redundancy for the PCI-X I/O chassis.
Each power supply has LED indicators that provide a visible indication of the status of the
converters (Power Good, Fault, ready for OLR).
Table 4-9 lists the actions to take when you encounter problems with the PCI-X DC-to-DC power
supply.
Troubleshooting Aids 89