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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-2
■ Section D.3, “Configuration of Signal Lines” on page D-3
■ 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
D.1 Overview
The UPS is a unit to ensure a stable supply of power to the system even in the event
of a power supply failure or a massive blackout.
When the UPC port on the server is connected to the UPS signal cable that has a
UPC interface, if the UPS detects a power failure, it notifies the server of the failure
so that the server can perform emergency shutdown processing. This stops the
server safely.