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20 Chapter 1
Introduction
System displays
the SMUC, which reports the environmental warning to the processors.
The power-on circuit displays the “highest priority” 48-Volt supply that
failed.
Ambient air sensors
The ambient air sensors detect a too warm or too hot condition in the
input air stream to the Utilities board (and therefore the entire node).
Ambient air too warm is an environmental warning; ambient air too hot
is an environmental error that powers down the system.
The temperature set points are set using the sppdsh utility, described in
“sppdsh” on page 268. The digital temperature sensor has nonvolatile
storage for the temperature set points. Power-on reset starts the digital
temperature sensor without the core logic microprocessor intervening.
AC circuit fail
An AC circuit failure denotes that the circuit that detects AC failures is
broken. A power-on reset clears this warning.