Owner`s manual

Operation
Controls,
LED
s,
and ports on the
front panel
Storage
Note
APC
recommends the factory default settings
among the settings shown below.
Function LED Display Description
Source
A
Sensitivity
Bright= Normal
Dim (the factory
default) = Reduced
Off = low
Sets transfer
sensitivity to line
conditions
Source
B
Sensitivity
Source
Preference
Bright = Source
A
(the factory default)
Dim = Source
B
Off = none
Selects the preferred
AC
source
Source
A
Xfer
Voltage
Bright = Narrow
Dim = Medium (the
factory default
Off = Wide
Sets the transfer
voltage window (the
range of acceptable
voltage)
Source
B
Xfer
Voltage
Redundant Switch