APC Rack Automatic Transfer Switch, 12A, 230V SU043 User Manual

The following programmable settings are accessible using 
controls located on the Redundant Switch front panel.

Function Select LED Indicator. The three green Function 
Select 

LED

s indicate which user programmable parameter is 

selected for status display or modification. Use the left 
selection button to cycle through the five configurable items 
defined in “Controls, LEDs, and ports on the front panel” on 
page 15.

Function Status LED Indicator. The green Function Status 

LED

 indicates the state of the selected user programmable 

function. Use the Select button to cycle among the choices.

AC Source LED Indicator. The green online 

LED

 indicates 

the line quality and selection status of each source: 

APC

 recommends 

that you do not change these settings, which are correct for 
most conditions. See “Controls, LEDs, and ports on the front 
panel” on page 15.

Bright

Source is selected.

Dim

Source is 

OK

, but not 

selected.

Off

Source is not 

OK

.

One 

LED

 is flashing once per 

second, and the other 

LED

 is off

Both AC sources are out of 
tolerance.