Dell EMC PowerEdge R940 Installation And Service Manual page 17

Table 12. AC PSU status indicator codes (continued)
Power indicator codes
Figure 11. DC PSU status indicator
1. DC PSU status indicator
Table 13. DC PSU status indicator codes
Power indicator codes
Green
Blinking amber
Not illuminated
Blinking green
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 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.
CAUTION: Combining AC and DC PSUs is not supported and triggers a mismatch.
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 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
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.
CAUTION: If two PSUs are used, they must be of the same type and have the same
maximum output power.
CAUTION: Combining AC and DC PSUs is not supported and triggers a mismatch.
PowerEdge R940 overview 17