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Chapter 3. Uninterruptible power supply controls, LEDs,
operating modes, and power
This chapter describes the controls, light-emitting diodes (LEDs), connectors,
operating modes, and how to turn the uninterruptible power supply on and off.
Front view
The following illustration shows the controls, LEDs, and connectors on the front of
the uninterruptible power supply.
General alarm LED
For more information about the LEDs, see "Operating modes" on page 18 and
Table 6 on page 39.
General alarm LED: When this LED is red and flashing and the alarm beeps every
5 seconds, the uninterruptible power supply is charging the battery. When this LED
is red and flashing and the alarm beeps continuously, the uninterruptible power
supply internal temperature is too high. When this LED is flashing and there is no
alarm beep, the battery is recharging.
On battery LED: When this LED is lit, the uninterruptible power supply is running
on battery power. When this LED is flashing, the battery capacity is low.
Battery service LED: When this LED is red and flashing, the battery is not
connected correctly or the battery needs to be replaced.
Site wiring fault LED: When this LED is red and flashing, there are problems with
the wiring outside the uninterruptible power supply.
Power-on LED: When this LED is green, the uninterruptible power supply is in
Normal mode. When this LED is red, the uninterruptible power supply is in Bypass
mode. When this LED is flashing, the uninterruptible power supply is in standby
mode.
Note: If this LED is off, it does not mean that there is no electrical power in the
uninterruptible power supply. The LED might be burned out. To remove all electrical
power from the uninterruptible power supply, you must disconnect the power cord
from the electrical outlet.
On button: Press this button to turn on the uninterruptible power supply.
Off button: Press this button to turn off the uninterruptible power supply.
© Copyright IBM Corp. 2006
On battery LED
Battery service LED
Load level LEDs
Power on LED
Site wiring fault LED
On button
Off button
Alarm reset button
17
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