Power supply units and indicators

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Each node contains two redundant power supply units (PSUs). Each power supply unit can provide power to the whole node.

The power supply has no power switch. A power supply is active when a power cord is connected to the power connector and to a power source. The following figure shows the rear view of a node and identifies the location of the two power supplies.

Figure 1. Node power supplies
Image showing power supply unit details
  •  1  Power supply 1
  •  2  Power supply 2

The following figure shows the details of a power supply.

Figure 2. Power supply details
Image showing power supply unit details
  •  1  Cable retention clip
  •  2  LED indicator
  •  3  Power supply release tab
  •  4  Power supply handle
  •  5  Power interposer release tab

Each enclosure contains five fans that enable cool air to be drawn in and passed over each power supply. The warmed air is ejected through the rear of each power supply. For optimal cooling, do not obstruct this airflow. Also, ensure that all enclosure components or fillers are installed while the system is operational.

Indicators

Each PSU has a tri-state indicator, which means that it might be off, green, or amber and indicates both good and error states. Table 1 describes the meaning of each indicator.
Table 1. Summary of LED indicators for the PSUs
Indicator Color Meaning
Power supply status Green
  • Off - The enclosure is not receiving AC power; ensure that the power is turned on.
  • On - The power supply is receiving AC power; no action is required.
  • Slow flash - AC is present. However, check the Event Log for errors, such as a possible fan failure.
  • Flashing - The power supply firmware is being updated. No actions are required; do not remove AC power.
Amber A fault needs to be resolved.
  • Slow flash - The power supply is on, but needs maintenance. Check the Event Log for errors and events where the power supply continues to operate, such as high temperature, high power, high current, or slow fan speed.
  • Solid - AC power is lost or the cable is unplugged, but power is still being supplied from the second power supply. There might also be a critical fault in the power supply (such as a fan failure) that causes it to shut down. Check that the AC power cable is plugged in and that power is available. If the amber LED persists, check the Event Log.