Dell DSS 2500 Owner's Manual page 16

Figure 7. AC PSU status indicator
1 AC PSU status indicator/handle
Table 7. AC PSU status indicator
Convention Power Indicator
Pattern
A Green
B Flashing green
C Flashes green and
turns off
D Flashing amber
16 Dell DSS 2500 system overview
Description
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.
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.
CAUTION: For AC PSUs, use only PSUs with the Extended Power Performance
(EPP) label on the back.
NOTE: Ensure that both the PSUs are of the same capacity.
NOTE: Mixing PSUs from previous generations of Dell servers can result in a
PSU mismatch condition or failure to turn the system on.
Indicates a problem with the PSU.
CAUTION: When correcting a PSU mismatch, replace only the PSU with the
flashing indicator. Swapping the other 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.
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.