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D-1
APPENDIX
D
UPS Controller
This appendix explains the UPS controller (UPC) that controls the uninterruptible power
supply (UPS) unit.
■ Section D.1, “Overview” on page D-1
■ Section D.2, “Signal Cable” on page D-1
■ Section D.3, “Signal Line Configuration” on page D-2
■ Section D.4, “Power Supply Conditions” on page D-4
■ Section D.5, “UPS Cable” on page D-5
■ Section D.6, “Connections” on page D-6
■ Section D.7, “UPC Port” on page D-7
D.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, so that the server can execute emergency shutdown processing to safely shut
down the system.
D.2 Signal Cable
Prepare 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.)