Dell XC720xd Owner's Manual page 15

Figure 7. DC PSU Status Indicator
1. DC PSU status indicator
Table 7. Power Indicator Patterns
Power Indicator Pattern Condition
Not lit Power is not connected.
Green The handle or LED indicator lights green indicating that a valid power source
is connected to the PSU and that the PSU is operational.
Flashing amber Indicates an issue in the PSU.
Flashing green When hot-swapping a PSU, this indicates that the PSU is mismatched with
the other PSU (in terms of efficiency, feature set, health status, and supported
voltage). Replace the PSU that has the flashing LED indicator with a PSU that
matches the capacity of the other installed PSU.
CAUTION: When correcting a PSU mismatch, replace only the PSU
with the flashing indicator. Swapping the opposite PSU to make a
matched pair can result in an error condition and unexpected system
shutdown. To change from a High Output configuration to a Low
Output configuration or vice versa, you must power down the system.
CAUTION: AC PSU support both 220 V and 110 V input voltages with
the exception of Titanium PSUs, which support only 220 V. When two
identical PSUs receive different input voltages, they can output
different wattages, and trigger a mismatch.
CAUTION: The PSU must be of the same type and have the same
maximum output power.
CAUTION: Combining AC and DC PSU is not supported and triggers a
mismatch.
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