Compaq ProLiant 6500 Compaq ProLiant 7000 Server Technology - Page 14
cont., Self-test, Auto Line Sensing, LED Standby Controls
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ECG078/0698 TECHNOLOGY BRIEF (cont.) ... The microcontroller performs the following functions: • Self-test - The intelligent power supplies perform their own power-on self-test that checks temperature, RAM integrity, ROM version, analog-to-digital conversion accuracy, and nonvolatile memory integrity of the power supply. • Auto Line Sensing - Because the power supplies are rated for both 750W (at 220V) and 500W (at 110V), a line-sensing feature automatically recognizes which line voltage is connected. The user does not need to configure the supply for voltage. • LED Standby Controls - The microcontroller also drives two status light-emitting diodes (LEDs) on the back of the power supply that indicate AC and DC power status, as shown in Figure 9. This gives the user vital status information at a glance. Green - AC power good Clear - AC power not good Clear - Front panel power switch off or open interlock Flashing Green - Power on delay or software power off Green - Outputs on and good Flashing Amber - Failed self test Amber - Outputs failed Flashing Amber/Green - Restart failed Figure 9: Power supply LED status indicators. 14