Dell PowerEdge R630 Owner's Manual page 24

Figure 11. 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
D Flashing amber
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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.
NOTE: For AC power supplies, use only PSUs with the Extended
Power Performance (EPP) label on the back. Mixing PSUs from
previous generations of servers can result in a PSU mismatch
condition or failure to power on.
Indicates a problem with the power supply unit.