SSI
ERP2U Power Supply Design Guide,
V1.0
- 30 -
8.4 LED Indicators
STATUS
Required
There shall be a single bi-color LED OR two LEDs, one AMBER and one GREEN, on each hot swap power
module to indicate power supply status. When AC is applied to the power supply and standby voltages are
available the GREEN LED shall BLINK. The GREEN LED shall turn ON to indicate that all the power outputs are
available. The AMBER LED shall turn ON to indicate that the power supply has failed, shutdown due to over
current, or shutdown due to over temperature. Refer to
Table 28: LED Indicators
for conditions of the LED(s).
Table 28: LED Indicators
POWER SUPPLY CONDITION
Power Supply LED(s)
AMBER
GREEN
No AC power to all PSU
OFF
OFF
No AC power to this PSU only
AMBER
OFF
AC present / Only Standby Outputs On
OFF
BLINK
Power supply DC outputs ON and OK
OFF
ON
Power supply failure (includes over
voltage, over temperature)
ON
OFF
Current limit
ON
OFF
The LED(s) shall be visible on the power supply’s exterior face. The LED location shall meet ESD requirements.
LED shall be securely mounted in such a way that incidental pressure on the LED shall not cause it to become
displaced.
