Dell PowerEdge R630 Owner's Manual page 28

Figure 11. AC PSU status indicator
1. AC PSU status indicator/handle
Table 11. AC PSU status indicators
Convention Power indicator
pattern
A Green
B Flashing green
C Flashing green
and turns off
D Flashing amber
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Condition
A valid power source is connected to the PSU and the PSU is
operational.
When the firmware of the PSU is being updated, the PSU handle
flashes green.
When hot-adding a PSU, the PSU handle flashes green five times at
4 Hz rate and turns off. This indicates a PSU mismatch with respect
to efficiency, feature set, health status, and supported voltage.
NOTE: Ensure that both the PSUs are of the same capacity.
CAUTION: For AC PSUs, use only PSUs with the Extended
Power Performance (EPP) label on the back.
NOTE: Mixing PSUs from previous generations of Dell
PowerEdge servers can result in a PSU mismatch condition or
failure to turn the system on.
Indicates a problem with the PSU.