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4. Using the Keys
4A. What the Keys Do
On/Off Key:
Pressing this key turns the UPS on or off. When you turn the unit off, you
must hold the key down briefly; the display will show “OF” before the unit
shuts down.
If the UPS shuts itself down because of an alarm, or if you shut the UPS down using a
command or DB9 contact, you can press this key to restart the UPS. Utility power must
be available at the outlet the UPS is plugged into before the UPS can restart. (See
Sections
for information on contacts. For information on sending commands
from a terminal or computer, call Best Power.)
Scroll Key (Silence, Display, or Test):
Pressing this key briefly displays the input voltage bar graph. (See Section
4B.) Pressing the key once more displays the battery charge bar graph.
Pressing the key briefly one more time switches the UPS back to the nor-
mal display.
If the UPS is sounding an alarm, pressing and holding this key silences the Morse Code
alarm. The display shows “Sh” when you do this. If you need to hear the alarm again,
press this key again; the display will show “Un” for “unsilence.”
If the UPS is not sounding an alarm, pressing and holding this key starts a system test;
the display will show “bt” briefly for “battery test.” The test determines whether the
UPS is ready to run on battery power. (The UPS does this test automatically every 30
days.) If the UPS fails the test, it sounds an “rb” alarm. (See
starts, you can cancel it by pressing and holding this key; the display will show “tc” for
“test cancel.” If the UPS cannot do the battery test because battery power is low, the dis-
play will show “t?.”
4B. Displaying the Input Voltage and Battery Charge Bar
Graphs
Displaying the Input Voltage Bar Graph:
The input voltage bar graph shows you whether the voltage coming into the UPS is
normal, high, or low. This information can help you (or a technician) identify prob-
lems in your input power.
To display this bar graph, press once. This display shows a “U” on the left and a
line on the right.The line on the right is a bar graph that shows the level of the volt-
age available at your wall outlet and how the UPS is using this voltage.
