Silicon Graphics TP9400 RAID Owner's Manual page 181

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with a line-to-neutral power connection (Table A-14). When installing a drive enclosure,
review the following specifications:
• Earth ground — The drive enclosure requires an earth ground conductor on the AC
power source.
• AC power source — The AC power source must provide the correct voltage,
current, and frequency specified by the manufacturer. If the drive enclosure will be
plugged into an internal AC distribution unit, make sure the internal unit can
handle the drive enclosure power requirements.
• Redundant AC Power, nominal 100 volt — To meet power requirements and
maintain power redundancy, connect the drive enclosure to 90 – 136 volt, 15 amp.
circuits as follows,
• Up to three drive enclosures — Use two, 90–136 volt, 15 amp. circuits. On each
drive enclosure, connect one power supply to one circuit and the other power
supply to the second circuit.
• Four or more drive enclosures — Use four 90–136 volt, 15 amp. circuits.
Connect half of the drive enclosures to two circuits and the remaining drive
enclosures to the other two circuits. Make sure each drive enclosure connects to
two different circuits (one per power supply).
• Redundant AC Power, nominal 240 volt — Use two 200–264 volt, 15 amp. circuits.
Connect one power supply from each drive enclosure to one circuit and the other
power supplies to the second circuit.
• Power supply voltage ranges — The auto-ranging power supplies automatically
match the voltage range (120 VAC or 220 VAC) to the AC power source. You can
switch the power supplies to alternate voltages (120 VAC to 220 VAC power
sources) an unlimited number of times.
Drive Enclosure Specifications
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