Allied Telesis AT-PWR02 - Manual (Page 11)

Removable Power Supply and Fan
10
3. Connect the power cord to the main power source.
4. Check that the Run/Standby switch is set to the Run position (1). Both the
AC and DC LEDs should be lit.
Note that when the Run/Standby switch is set to the Standby position (0),
the AC LED lights and the fan spins, but the DC LED does not light and the
PSU does not deliver power to the device.
5. The PSU LED on the front panel of the switch lights green. If the LED does
not light green, check the Run/Standby switch. See the Hardware Reference
for more troubleshooting information.
Run/Standby
switch
AC
LED
DC LED