Table 14. AC PSU status indicator codes (continued)
Power indicator codes Condition
Blinking green When the firmware of the PSU is being updated, the PSU handle blinks green.
CAUTION: Do not disconnect the power cord or unplug the PSU when updating
firmware. If firmware update is interrupted, the PSUs do not function.
Blinking green and turns
off
When hot-plugging a PSU, the PSU handle blinks green five times at a rate of 4 Hz and turns off.
This indicates a PSU mismatch with respect to efficiency, feature set, health status, or supported
voltage. If two PSUs are installed, both the PSUs must have the same type of label; for example,
Extended Power Performance (EPP) label. Mixing PSUs from previous generations of PowerEdge
servers is not supported, even if the PSUs have the same power rating. This results in a PSU
mismatch condition or failure to turn the system on.
CAUTION: When correcting a PSU mismatch, replace only the PSU with the blinking
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 turn off the system. AC PSUs
support both 240 V and 120 V input voltages with the exception of Titanium PSUs,
which support only 240 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. Combining AC and DC PSUs is not supported and triggers a
mismatch.
DC PSU status indicator
1. DC PSU status indicator
Table 15. DC PSU status indicator codes
Power indicator codes Condition
Green
A valid power source is connected to the PSU and the PSU is operational.
Blinking amber Indicates a problem with the PSU.
Not illuminated Power is not connected to the PSU.
Blinking green When hot-plugging a PSU, the PSU indicator blinks green. This indicates that there is a PSU
mismatch with respect to efficiency, feature set, health status, or supported voltage.
CAUTION: If two PSUs are installed, both the PSUs must have the same type of
label; for example, Extended Power Performance (EPP) label. Mixing PSUs from
previous generations of PowerEdge servers is not supported, even if the PSUs
22 Dell EMC PowerEdge R640 overview
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