Digital Equipment StorageWorks UltraSCSI DS-BA370 Series, User Manual

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Power Distribution
UltraSCSI RAID Enclosure 6–3
n+4 (Redundant)
This configuration has four redundant power supplies for a total of eight
power supplies. Two power controllers distribute ac power to four supplies
on power bus A and power bus B. This configuration requires only one ac
power source.
n+4 (Optimum)
This configuration has four redundant power supplies for a total of eight
power supplies. Two power controllers distribute ac power to four supplies
on power bus A and power bus B. This configuration requires two ac power
sources.
AC Power Source
The power controller requires one of the following ac power sources:
100–120 V ac, 60 Hz, single-phase, 12A.
or
220–240 V ac, 50 Hz, single-phase, 6A.
The optimum power configuration requires two separate ac power sources;
one for each power controller. The ac power sources cannot be on the same
distribution leg, use the same circuit breaker, nor the same ac wall
receptacle. They must have common ground.