Dell PowerEdge R630 Owner's Manual page 29

Convention Power indicator
pattern
E Not lit
Figure 12. DC PSU status indicator
1. DC PSU status indicator
Condition
CAUTION: When correcting a PSU mismatch, replace only the
PSU with the flashing indicator. Swapping the 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 PSUs 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: If two PSUs are used, they must be of the same type
and have the same maximum output power.
CAUTION: Combining AC and DC PSUs is not supported and
triggers a mismatch.
Power is not connected.
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