Compaq ProLiant 8500 ProLiant 8500 Server Technology - Page 16

Power-Down Controls, Load Balancing, Power Factor Correction, System, Board, Power, Backplane

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TC000604TB TECHNOLOGY BRIEF (cont.) ... Power-Down Controls As shown in Figure 10, the server power switch connects to the Advanced Configuration and Power Interface (ACPI) controller rather than directly to the power line. This means that turning off the power switch does not turn off power instantly. Instead, the ACPI controller communicates with the system board and the OS. The power-down controls can be configured in one of three ways: • Secure mode - Power supply will not shut down if power switch is pressed. • Delay mode - Power supply will shut down after a 10-second delay. This allows time to reactivate the switch if it was mistakenly pressed. • Graceful shut down - A 10-second delay counter begins as a message warning of an imminent power-down goes to Compaq Insight Manager and the IMD. Because of the communication between the ACPI controller and the OS, the OS can delay the power down until all running applications have properly closed. Should the OS not be running, the power would go down when the delay counter expired. The power-down control feature is supported under Microsoft Windows NT and Novell NetWare. SCO is planning to implement support for the power-down control in the future. Power Backplane Power Supply DC AC/DC AC Converter System Board OS I2C Bus Microcontroller Power Switch ACPI Controller Figure 10: Power supply schematic. Power On Soft Power Down Load Balancing The power supplies automatically load balance to within 10 percent of the average current of all supplies. Before the power comes up, the master power supply matches its output load rails to those of the other power supplies so that the load is automatically balanced across all power supplies. If one supply fails, the load balancing feature allows the other supplies to pick up the remaining power load quickly. Power Factor Correction Compaq's intelligent power supplies have built-in power factor correction to synchronize the voltage and current phases. This helps ensure that maximum power is available. It also reduces the return current in the ground line, which reduces the overall power consumption. 16

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T
ECHNOLOGY
B
RIEF
(cont.)
16
TC000604TB
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Power-Down Controls
As shown in Figure 10, the server power switch connects to the Advanced Configuration and Power
Interface (ACPI) controller rather than directly to the power line.
This means that turning off the
power switch does not turn off power instantly.
Instead, the ACPI controller communicates with
the system board and the OS.
The power-down controls can be configured in one of three ways:
•
Secure mode – Power supply will not shut down if power switch is pressed.
•
Delay mode – Power supply will shut down after a 10-second delay.
This allows time to
reactivate the switch if it was mistakenly pressed.
•
Graceful shut down – A 10-second delay counter begins as a message warning of an imminent
power-down goes to Compaq Insight Manager and the IMD.
Because of the communication
between the ACPI controller and the OS, the OS can delay the power down until all running
applications have properly closed.
Should the OS not be running, the power would go down
when the delay counter expired.
The power-down control feature is supported under Microsoft Windows NT and Novell NetWare.
SCO is planning to implement support for the power-down control in the future.
System
Board
OS
Power
Backplane
Power Supply
AC/DC
Converter
AC
DC
Microcontroller
Power
Switch
Power On
Soft Power Down
I
2
C Bus
ACPI
Controller
Figure 10:
Power supply schematic.
Load Balancing
The power supplies automatically load balance to within 10 percent of the average current of all
supplies.
Before the power comes up, the master power supply matches its output load rails to
those of the other power supplies so that the load is automatically balanced across all power
supplies.
If one supply fails, the load balancing feature allows the other supplies to pick up the
remaining power load quickly.
Power Factor Correction
Compaq’s intelligent power supplies have built-in power factor correction to synchronize the
voltage and current phases.
This helps ensure that maximum power is available.
It also reduces the
return current in the ground line, which reduces the overall power consumption.