Power Indicator Codes - Dell Precision Rack 7910 Owner's Manual

Power indicator codes

Each AC power supply unit (PSU) has an illuminated translucent handle and each DC power supply unit
(when available) has an LED that serves as an indicator to show whether power is present or a power fault
has occurred.
Figure 49. AC power supply unit status indicator
1. AC power supply unit status indicator/handle
Convention Power indicator
pattern
A Green
B Flashing green
C Flashing green
and turns off
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Condition
The handle indicator lights green indicating that a valid power
source is connected to the power supply unit and that the power
supply unit is operational.
When updating the firmware of the power supply unit, the power
supply unit handle flashes green.
When hot-adding a power supply unit (PSU), the power supply unit
handle flashes green five times at 4 Hz rate and turns off. This
indicates that the power supply unit is mismatched with the other
power supply unit (in terms of efficiency, feature set, health status,
and supported voltage). Replace the power supply unit that has the
flashing indicator with a power supply unit that matches the capacity
of the other installed power supply unit.
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