User guide

Figure 31 Locations and colors of power supply LEDs
1. Power supply LEDs
Table 47 (page 216) describes how to interpret LED activity that you might see.
Table 47 Explanation of power supply LED states
Possible States and ExplanationsRepresentsLED Color
AC OKGreen (top LED)
• Steady on: power supply AC input is above
minimum requirements to operate
• Steady off: power supply AC input is below
minimum requirements to operate
DC OKGreen (middle LED)
• Steady on: power supply output voltage is
within specifications
• Steady off: power supply output voltage is
outside of specifications
FaultBlue (bottom LED)
• Steady on: indicates any of the following
conditions:
◦ Power supply output is outside of
specifications.
◦ Current limit has been exceeded.
◦ Temperature limit has been exceeded.
◦ AC input is below minimum operating
voltage.
◦ PDU is on, but the Power button on the
library's indicator panel is off.
◦ Fan failed while AC input is present and
above minimum operating voltage.
• Steady off: no faults are detected
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