IBM Uninterruptible Power Supply IBM UPS 7500XHV - Manual (Page 16)

12
F EATURE F UNCTION
Diagnostic Utility
Voltage The uninterruptible power supply has a diagnostic feature that displays the utility volt-
age.
Note: The uninterruptible power supply starts a self-test as part of this procedure. The
self-test does not affect the voltage display.
Press and hold the button to view the utility voltage bar graph display. After a few
seconds, this five-LED Battery Charge display on the right of the front panel will
show the utility input voltage.
Refer to the figure to the left for the voltage reading corresponding to the configured
nominal output voltage.
The display indicates that the voltage is between the displayed value on the list and the
next higher value.
If three LEDs are lit, the utility voltage is within the normal range. If no LEDs are lit
and the uninterruptible power supply is plugged into a properly functioning utility
power outlet, the line voltage is extremely low. If all five LEDs are lit, the line voltage
is extremely high and should be checked by an electrician.
On Battery Operation
The uninterruptible power supply automatically switches to battery operation if the utility power fails. While running on battery,
an alarm beeps four times every 30 seconds.
Press the button to silence this uninterruptible power supply alarm. If the utility power does not return, the uninterruptible
power supply continues to supply power to the connected equipment until the battery is fully discharged.
If you are not using PowerChute, shut down the operating system and turn off the computer before the uninterruptible power
supply fully discharges the battery.
Determining On Battery Runtime
The uninterruptible power supply battery charges when connected to utility power. The battery charges to 90% capacity during
the first three hours of normal operation. Do not expect full battery run capability during the initial charge period.
Battery Runtime Tables
The dark gray shaded areas in the charts that follow represent minutes; the other areas represent hours.
Note: The recharge time is the approximate time it takes to get to a 90% capacity from a complete discharge at a 50% load.