18
E
N
G
L
I
S
H
Problem
Possible Reason for Problem
What to Do
The yellow
light is
blinking.
The green light
is blinking
while the
yellow Battery
light is on.
The UPS
will not
communicate.
The UPS
always runs on
battery power
(the yellow
Battery light is
always on).
The UPS is doing a system test to
make sure it can run on battery. The
unit does this test every 30 days; if
it finds a battery problem, it will
sound an “rb” alarm. You can also
start this test using the key.
The input voltage the UPS is receiv-
ing from your wall outlet is either
very high or very low, so the UPS is
running on battery power to make
sure your equipment receives quali-
ty power.
•The UPS may not be in the correct
communication mode.
•The UPS baud (communication)
rate (normally 1200) may not match
your computer’s baud rate.
•Extensions with incorrect pinouts
may have been added to the inter-
face cable Best Power provided.
•The Best Power-supplied cable
may have been plugged in incorrect-
ly.
•The detachable cord may not be
completely plugged into the back of
the UPS or the wall outlet.
•The wall outlet may not be provid-
ing power.
•The fuse may need replacing.
•The input power available at your
outlet may be unstable.
Since this is a normal part of the UPS’
operation, you do not need to react to
this condition. If the UPS discovers a
problem, it will sound an alarm.
The UPS will continue to run on battery
power until input voltage is normal or
until the UPS runs out of runtime and
sounds an “Lb” (Low Battery shut-
down) alarm. If the UPS runs on battery
power too often, try changing the UPS’
sensitivity to power problems. (See
•See Section 5 for a description of the
modes and how to change modes.
•Change the baud rate of your computer
or terminal. To change the UPS’ baud
rate, see
•Remove any extension cables. Use the
cable Best Power provided to connect
the UPS directly to the computer.
•Make sure the end of the cable marked
“UPS” is plugged into the UPS, and the
other end is plugged into the computer.
•Make sure the cord is completely
plugged into the UPS and the wall out-
let.
•Try a different outlet.
•Replace the fuse. (See Section 7C.)
•Try switching the DIP switches that
adjust Line Sensitivity and the Input
Voltage Range. See
