Dell EMC PowerEdge R840 Installation and Service Manual

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Power supply unit indicator codes

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 about the PSU specifications, see the PowerEdge R840 Technical Specs at www.dell.com/poweredgemanuals..

For information about the event and error messages generated during POST, when a 2400W PSU is connected to a 110 V power source, see the Dell Event and Error Messages Reference Guide at https://www.dell.com/openmanagemanuals.

The indicator shows whether power is present or if a power fault has occurred.

This image shows AC PSU status indicator. — Figure 1. AC PSU status indicator

Table 1. AC PSU status indicator codesThis table describes the AC PSU status indicators and the condition of 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 cable, 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 concerning 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 on the system. 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 conversely, you must turn off the system. CAUTION AC PSUs support both 240 V and 120 V input voltages except for 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.

This image shows DC PSU status indicator. — Figure 2. DC PSU status indicator

Table 2. DC PSU status indicator codesThis table describes the DC PSU status indicators and the condition of 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 hot-plugging a PSU, the PSU indicator blinks green. This indicates that there is a PSU mismatch about 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 on the system. 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 conversely, 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.