Configuration Rules - Sun Microsystems Fire V890 Service Manual

The system can accommodate a maximum of three power supplies, each with its
own 10-amp AC power cord. Each power supply provides up to 1629 watts of DC
power at 200-240 VAC line input. The basic system configuration comes with three
power supplies installed. The third power supply provides N+1 power redundancy,
allowing the system to continue operating should any one of the power supplies fail.
Each power supply provides a total of five DC output voltages (3.3V, 5.0V, 12V, 48V,
and 5.0V standby). Output current is shared equally between each of the supplies
via active current sharing circuitry.
Power supplies in a redundant configuration feature a hot-swap capability. You can
remove and replace a faulty power supply without shutting down the operating
system or turning off the system power. For additional details, see
Pluggable and Hot-Swappable Components" on page
Each power supply has three status LEDs to provide power and fault status
information. For additional details, see

Configuration Rules

Sun Microsystems recommends that you connect each power supply to a
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dedicated AC circuit. Consult your local electrical codes for any additional
requirements.
The minimum system configuration requires two power supplies. The basic
■
system configuration comes with three power supplies installed. Systems
configured with only one power supply are not supported
A system configured with two power supplies may shut down abruptly if either
■
power supply fails. The third power supply enables the system to remain fully
operational should any one of the power supplies fail.
Power supply bays 0 and 1 must always contain power supplies. If a power
■
supply in either bay fails and the system can continue to operate, you must leave
the failed power supply in its bay until you are able to install a functioning
replacement power supply. A failed power supply in bay 0 or 1 still acts as an air
baffle, channeling airflow to cool the bottom row of disk drives in the disk cage.
The failed power supply should be replaced as soon as possible to regain N+1
power redundancy.
Caution – If any power supply fails, leave the supply in its bay until you are ready
to install a replacement.
For information about installing power supplies, see
Supply" on page 160.
6.
"About Power Supply LEDs" on page
"How to Install a Power
Chapter 7 Hardware Configuration
"About Hot-
265.
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