Dell PowerEdge R930 Owner's Manual page 20

Figure 7. AC PSU status indicator
1. AC PSU status indicator/handle
Convention Power indicator
pattern
A Green
B Flashing green
C Flashing green
and turns off
D Flashing amber
20
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.
CAUTION: Do not disconnect the power cord or unplug the
PSU when updating firmware. If firmware update is
interrupted, the PSUs will not function. You must roll back the
PSU firmware by using Life cycle controller. See Dell Lifecycle
Controller User's Guide at Dell.com/esmmanuals.
When hot-adding a PSU, the PSU handle flashes green five times at
4 Hz rate and turns off. This indicates that there is a PSU mismatch
with respect to efficiency, feature set, health status, and supported
voltage. Replace the PSU with a PSU that matches the capacity of
the other PSU.
CAUTION: For AC PSUs, use only PSUs with the Extended
Power Performance (EPP) label on the back. Mixing PSUs from
previous generations of Dell PowerEdge servers can result in a
PSU mismatch condition or failure to power on.
Indicates a problem with the PSU.