Power Subsystem Behavior - HPE Integrity rx2800 i2 series User's & Service Manual

NOTE:
Power supply CRU failures are identified visually by a single green LED that is turned off when one
or both of the power supplies fail; logged as an IPMI event by voltage sensor logic; and identified as
a power supply CRU failure by iLO3 turning on the appropriate LEDs on the front LED panel.
The Power Supply LED on the SID panel illuminates only when a failure or fault is detected in a
power supply. Loss of AC power to a power supply generates an SEL entry, but does not result in
the Power Supply LED becoming illuminated.
The System Health LED does not change status if AC power is removed from a single power supply
in a rx2800 i2 server system with power redundancy.

Power subsystem behavior

For the server, each bulk power supply CRU provides 800 watts of DC power from a nominal 120 VAC,
50-60 Hz; and 1200 watts from a nominal 240 VAC, 50-60 Hz. The iLO MP chip located on the system
board controls the flow of +12 V DC power to the server CRUs. You can control and display power supply
status remotely with the iLO 3 MP pc and ps commands, respectively.
Typical power up sequence of the server is as follows:
Procedure
1. Power LED on front panel glows steady amber when one or two bulk power supplies are plugged into
nominal AC voltage and the +3.3 VDC housekeeping voltage comes on and stays on whenever AC
power is present.
2. The iLO 3 MP, Flash memory, and server intrusion circuits are reset after the +3.3 V DC housekeeping
voltage stabilizes.
3. The iLO 3 MP monitors the power button on the front panel.
4. When the power button is pressed, iLO 3 signals the bulk power supplies to fully power up.
5. The +12 V DC rail comes up and all of the cooling fans and the various Voltage Regulators come up
sequentially.
6. The iLO 3 MP signals when the server is ready to come out of reset (clocks are programmed and
stable, etc.).
7. The server is brought out of reset, and begins the boot process.
Power LED button
The front panel system power LED indicates the status of system power. The LED is incorporated inside
the power button itself.
The power button has a momentary switch (as opposed to a latching switch) that is recessed or covered
to prevent accidental activation or deactivation.
If the OS is up, pressing the power button for less than four seconds results in a graceful shutdown of the
operating system and a subsequent removal of system power. Pressing the power button for greater than
four seconds results in a hard shutdown (system power removed). While the server is booting (before the
system has passed UEFI_EXIT_BOOT_SERVICES), the iLO MP immediately powers the server off on a
button press, since there is no concept of soft shutdown in this state.
In the event that the OS is absent or hung, or that the manageability subsystem (specifically the iLO MP)
in the server is not responding, a greater than four second press of the power button is required to power
off the system (a less than four second press on the power button has no effect).
Power subsystem behavior 119