Power supply units

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

Each AC power supply unit contains the components that are shown in Components of the AC power supply unit. Each power supply also contains fans that cool the enclosure. Cool air is drawn in through the front of the enclosure. The air passes over the drives, node canisters, and power supplies. The warmed air is ejected through the rear of each power supply. For optimal cooling, do not obstruct the airflow and ensure that all enclosure components or fillers are installed while the system is operational.

Note: The power supply does not have a power switch. A power supply is active when a power cord is connected to the power connector 4 and to a power source.
Figure 1. Components of the AC power supply unit
AC power supply unit

Power supply unit LED indicators

Power supply LED indicators lists the LED indicators on the power supply, next to the input power connector. For more information, see Procedure: Understanding the system status LEDs.

Table 1. Power supply LED indicators. Enclosure power supply indicators and status
Name Symbol Color State Meaning
Input current status Input current status icon Green OFF No input power detected.
ON Input power detected.
Fault Fault icon Amber OFF No fault detected.
ON A fault within the power supply has been detected.
  Icon not used Blue   Not used.
Parent topic: Components in the rear of the control enclosures
Related tasks
Procedure: Understanding the system status LEDs