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Chapter 7 Power System
A redundant power system uses a power share backplane to distribute
power to the server. The backplane implements these server management
features:
• I
2
C 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 areas—less than 240 VA for the CSA Level 3 category—
without the use of interlocks.
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 -5V -12V
One power supply, entry level nonredundant
(Total combined output power of +3.3 V and +5 V
should not exceed 178W)
13 A 32 A 15.5
A
0.25 A 0.5 A
Two power supplies, entry level redundant 13 A* 30 A 13.5
A
0.25 A 0.5 A
Two power supplies, maximum level
nonredundant
18 A
**
46 A 29 A 0.5 A 1.0 A
Three power supplies, maximum level redundant 18 A
**
46 A 29 A 0.5 A 1.0 A
* No more than 5A to be used by PCI slots.
** No more than 10A to be used by PCI slots.