AC power supply units (PSUs) have an illuminated translucent handle that serves as an indicator and DC PSUs have an LED that serves as an indicator. The indicator shows whether power is present or a power fault has occurred.
Figure 1. AC PSU status indicator
AC PSU status indicator/handle
Table 1. AC PSU status indicatorsThis table describes the AC PSU status indicators and what condition is the PSU when the power indicator light is green, flashing green, flashing amber, and when it is not lit.
Convention
Power indicator pattern
Condition
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.
C
Flashing 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 a PSU mismatch with respect to efficiency, feature set, health status, and supported voltage.
NOTE: Ensure that both the PSUs are of the same capacity.
CAUTION: For AC PSUs, use only PSUs with the Extended Power Performance (EPP) label on the back.
NOTE: Mixing PSUs from previous generations of Dell PowerEdge 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 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.
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.
E
Not lit
Power is not connected.
Figure 2. DC PSU status indicator
DC PSU status indicator
Table 2. DC PSU status indicatorsThis table describes the DC PSU status indicators and what condition is the PSU when the power indicator light is green, flashing green, flashing amber, and when it is not lit.
Convention
Power indicator pattern
Condition
A
Green
A valid power source is connected to the PSU and that the PSU is operational.
B
Flashing green
When hot-adding a PSU, the PSU indicator flashes green. This indicates that there is a PSU mismatch with respect to efficiency, feature set, health status, and supported voltage. Ensure that both the PSUs are of the same capacity.
C
Flashing amber
Indicates a problem with the PSU.
CAUTION: When correcting a PSU mismatch, replace only the PSU with the flashing 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: AC PSU support both 220 V and 110 V input voltages with the exception of Titanium PSU, which support only 220 V. When two identical PSU receive different input voltages, they can output different wattages, and trigger a mismatch.
CAUTION: If two PSU are used, they must be of the same type and have the same maximum output power.
CAUTION: Combining AC and DC PSU is not supported and triggers a mismatch.
D
Not lit
Power is not connected.
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