3B. Display
The UPS uses the two-character display above the lights to show you the unit’s status. If
the red light is on, the UPS flashes a two-letter alarm message. Press the key
to silence the alarm; then, find the alarm message in
alarm. If the display shows a “b” (“battery”) or “U” (“utility power”) with a line after it,
the display is showing a bar graph of the battery charge or input voltage. See
to display and interpret bar graphs. The table below explains other displays you may see
on the front panel.
10
E
N
G
L
I
S
H
When you silence an alarm, the UPS displays “Sh” briefly. To silence an alarm, press
the key. Once you silence the alarm, the red light will be steady instead of flashing.
The UPS shows this display when you cancel a battery test. See the “bt” display
above.
Normally, you can start a battery test by pressing and holding the key. If the UPS
cannot do this test because the battery power is low, the display will show “t?.”
“Un” stands for “unsilence.” When you silence an alarm, the UPS shows the “Sh”
display shown above. If you want to hear the alarm again, you can press the key;
the UPS will sound the alarm and show “Un” briefly on the display.
If the green light is on, the display is showing the percent of the UPS’ power your
equipment is using. If your equipment requires more than 100% of the power your
model can provide, the UPS will sound an Overload alarm. (See
If the yellow light is on, the display is showing the estimated battery backup time
left — in other words, the number of minutes the UPS can continue running on bat-
tery power until it shuts down.
The UPS displays “On” briefly when you turn the unit on.
The UPS displays “OF” briefly when you turn the unit off.
Some alarms cause the UPS to shut down; the UPS also shuts down when you use
the off or shutdown commands. (See the – – display above.) Once the UPS has shut
down, you can restart it using the key on the front panel. However, if utility
power is not available from the outlet the UPS is plugged into, the UPS will not
restart, and it will show this display.
The UPS displays “bt” when you have started a battery test by pressing and holding
the
key
.) This test determines whether the UPS is ready to run
on battery power. If the UPS fails the test, it sounds an “rb” (replace battery) alarm;
see
. Once the test starts, you can cancel it by pressing and holding the
key; the display will show “tc” for “test cancel.”
The UPS shows this display when you have shut it down using the off or shutdown
command. You can send this command if you have connected a computer to the UPS’
RS232 port and if the UPS is in RS232 mode. For more information,
for document FTS 502.
