Owners Manual

Redundant power supply unit indicator codes
Each AC power supply unit (PSU) has an illuminated translucent handle that indicates whether power is present or whether a
power fault has occurred.
Figure 7. AC PSU status indicator
1. AC PSU status indicator/handle
Table 7. AC PSU status indicator
Convention Power Indicator
Pattern
Description
A Green A valid power source is connected to the PSU and the PSU is operational.
B Flashing green 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.
C Flashes green and
turns off
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.
D Flashing amber 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.
14 Dell DSS 2500 system overview