AC power supply units (PSUs) have an illuminated translucent handle that serves as an indicator.
The DC PSUs have an LED that serves as an indicator.
For more information on the PSU specifications, see the
Dell EMCPowerEdgeR940xa Technical Specifications on the product documentation page.
For information about the event and error messages generated during POST, when a 2400W PSU is connected to a 110V power source, see the Dell Event and Error Messages Reference Guide at
www.dell.com/qrl.
The indicator shows whether power is present or if a power fault has occurred.
Figure 1. AC PSU status indicator
AC PSU status indicator/handle
Table 1. AC PSU status indicator codesThis table describes the AC PSU status indicators and what condition is the PSU when the power indicator light is green, blinking green, blinking amber, and when it is not lit.
Power indicator codes
Condition
Green
A valid power source is connected to the PSU and the PSU is operational.
Blinking amber
Indicates a problem with the PSU.
Not illuminated
Power is not connected to the PSU.
Blinking green
When the firmware of the PSU is being updated, the PSU handle blinks green.
CAUTION Do not disconnect the power cord or unplug the PSU when updating firmware. If firmware update is interrupted, the PSUs do not function.
Blinking green and turns off
When hot-plugging a PSU, the PSU handle blinks green five times at a rate of 4 Hz and turns off. This indicates 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 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.
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