Power supply units and indicators

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

Figure 1 shows the rear view of a control enclosure and identifies the location of a power supply unit and its indicators. 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 details of a power supply.

Figure 1. 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.
  • 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 that causes it to shut down (such as a fan failure). Check that the AC power cable is plugged and power is provided. If the amber LED persists, check the Event Log.