E-1
APPENDIX
E
UPS Controller
This appendix explains the UPS controller (UPC) that controls the uninterruptible
power supply (UPS) unit.
■ Section E.1, “Overview” on page E-1
■ Section E.2, “Signal Cables” on page E-1
■ Section E.3, “Signal Line Configuration” on page E-2
■ Section E.4, “Power Supply Conditions” on page E-3
■ Section E.5, “UPS Cable” on page E-4
■ Section E.6, “UPC Connector” on page E-5
E.1 Overview
A UPS unit is used to provide a stable supply of power to the system in the event of
a power failure or an extensive power interruption.
When a failure is detected in the supply of power, an error can be reported to the
server through the signal cable connection between a UPC port on the server and a
UPS that has the UPC interface. Then the server can execute emergency shutdown
processing to safely shut down the system.
E.2 Signal Cables
Use shielded and paired cables that have the following specifications:
■ DC resistance (roundtrip/1 pair): 400 Ω/km or less
■ Cable length: Up to 10 m (33 ft)
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