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Figure 11. AC PSU status indicator
1
AC PSU status indicator/handle
Table 14. AC PSU status indicator codes
Power indicator codes
Green
Blinking amber
Not illuminated
Blinking green
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
Condition
A valid power source is connected to the PSU and the PSU is operational.
Indicates a problem with the PSU.
Power is not connected to the PSU.
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.
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.
Dell EMC PowerEdge R640 system overview
23
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