The power supply unit is located at the back of the controller.
Each power supply has a single bi-color LED to indicate power supply unit status. Use the information in the following table to interpret the health of the power supply unit and the redundant power supply unit, if one is installed.
| Power Supply Condition | LED Pattern |
|---|---|
| Output on and OK. | Green |
| No AC power to all power supplies. | Off |
|
AC present / Only 12VSB on (power supply is off) or power supply in cold redundant state. |
1Hz Blinking Green |
|
AC power cord unplugged or AC power lost. With a second power supply in parallel still with AC input power. |
Amber |
|
Power supply warning events where power supply continues to operate — high temp, high power, high current, or slow fan. |
1Hz Blinking Amber |
|
Power supply critical event causing a shutdown, failure, OCP, OVP, or fan fail. |
Amber |
| Power supply firmware is updating. | 2Hz Blinking Green |