Power Subsystem; Uninterruptible Power Supply (Optional) - DEC 4000 600 series Owner's Manual

The power subsystem has five basic components:
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All of the power supply components (except the local disk
converters) plug into and mount in a card cage attached to the
system backplane. A local disk converter is packaged with each
fixed-media storage assembly.
You can enhance system availability with an optional external
uninterruptible power supply (UPS). A UPS is able to keep the
system running in the event of a power failure.
Uninterruptible You can connect an optional uninterruptible power supply to
Power Supply your system. Connecting an uninterruptible power supply (UPS)
(Optional) to the DEC 4000 AXP system can keep the system running for
approximately 30 minutes after a power failure.
For information about ordering a UPS for your system, refer to
the Systems and Options Catalog.
Front end unit (AC to 48 VDC with power factor correction)
Power system controller
DC-DC converter unit—5 V at 150 A.
DC-DC converter unit—This unit generates three voltages:
12 V at 4 A, 3.3 V at 20 A, and 2.1 V at 10 A (Futurebus+
terminator power).
Local disk converters. The local disk converters generate
three voltages for storage devices (+5, +12, and +5 V
SCSI-2/DSSI terminator voltage).

Power Subsystem

Learning More About Your System 7–9