Figure 2-21 Power Distribution Unit And Power Strip - Silicon Graphics Origin 350 User Manual

2: System Overview
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Power distribution unit (PDU)
Wall power
source
Figure 2-21 Power Distribution Unit and Power Strip
• Power supply. The L2 controller receives power from a power supply that is
attached to the side of the rack. This power supply receives AC voltage from a PDU
and converts the voltage to 48 VDC, which is the input voltage that the L2 controller
requires.
• Power bay module. This module exists in the system when the system contains a
PCI expansion module. It inputs AC voltage from a PDU and converts this AC
voltage to 48 VDC and 12-VDC standby voltage. The power bay outputs these
voltages to the PCI expansion module. The 48 VDC powers on the PCI expansion
module. The 12-VDC standby voltage powers on the L1 controller logic within the
PCI expansion module.
The power bay module, shown in Figure 2-22, can house as many as six power
supplies; however, this system requires only two or three power supplies. The third
power supply is required when a rack has more than one PCI expansion module.
When the power bay contains two power supplies, the outputs of the power
supplies are bused together to provide 1,840 W at 48 VDC and 90 W at 12-VDC
standby. When the power bay contains three power supplies, the outputs of the
power supplies are bused together to provide 2,720 W at 48 VDC and 138 W at
12-VDC standby.
Power strip
Output receptacles
Input receptacle
Circuit breaker and switch
007-4566-001