Service manual

System Overview 1-113
Figure 1–52 shows the PCI power supply, which receives AC power from the AC
input box. The supply plugs into the front of the PCI box. One power supply is
required for a PCI box; the second is redundant.
The power module converts single phase AC input to the following required
outputs:
• +3.3V at 57A
• +5.0V at 50A
• +12V at 7A
• -12V at 1.5A
• Vaux (+5.0V) at 2A (Vaux - always
on when AC applied)
Features of the power supply are:
• Power factor correction on AC input
• May be placed in parallel
• May be hot swapped
• Output is automatically adjusted by sensing the voltage at the load and changing
power supply output accordingly
• Fault protection for:
− Overcurrent
− Overvoltage
− Overtemperature
− Magnetic interlock switch
• Status signals
− POK_L
− VAUX_OK_L
− OVERTEMP_L
− PRESENT_L
• LEDs
− Power OK
− Vaux OK
− Swap OK