A redundant power system uses a power share backplane to distribute power to the server. The backplane implements these server management features:
∙I2C bus
∙Power supply failure
∙Maximum current
∙Current usage
∙Number of power supplies installed in the server’s power system
∙Redundant mode
∙240 VA limit
The current sensing feature of the power share backplane shuts down the entire power system if any single output from the backplane to the system board or peripherals exceeds 240 VA. Current sensing limits the energy supplied by the power share backplane to levels generally accepted as operator accessible
If a power supply fails in a redundant power system, the yellow power supply failure LED on the front panel starts flashing. The power supply can be easily replaced without shutting down the system. The power supply is inserted through the back of the chassis and held in place with four screws.
Power System Voltages | +3.3V | +5V | +12V | |||
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One power supply, entry level nonredundant | 13 A | 32 A | 15.5 | 0.25 | A | 0.5 A |
(Total combined output power of +3.3 V and +5 V |
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| A |
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should not exceed 178W) |
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Two power supplies, entry level redundant | 13 A* | 30 A | 13.5 | 0.25 | A | 0.5 A |
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| A |
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Two power supplies, maximum level | 18 A | 46 A | 29 A | 0.5 | A | 1.0 A |
nonredundant | ** |
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Three power supplies, maximum level redundant | 18 A | 46 A | 29 A | 0.5 | A | 1.0 A |
| ** |
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*No more than 5A to be used by PCI slots.
**No more than 10A to be used by PCI slots.
164 | Chapter 7 Power System |
