Compaq Pro UPS 500 Operation And Reference Manual page 38

3-6 Compaq Pro UPS 500 Operation and Reference Guide
Automatic Voltage Regulation (Boost) Mode: When an undervoltage
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occurs, the UPS will automatically correct the voltage level without
switching to battery power. When this occurs, the UPS may emit a
clicking sound. The more the UPS adjusts the voltage level, the more
the UPS will click. This is a normal, automatic operation of the UPS,
and no action is required.
Start-On-Battery Operation
Compaq Pro UPS 500 models have special circuitry that allows them to be
used as standalone power sources when utility power is not present. The
Battery-and-Surge-Protected receptacles will supply AC power for the time
limits of the internal battery. The Surge-Protected receptacles, however, will
not supply AC power until utility power returns.
To perform the UPS Start-On-Battery operation when you first plug in
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the unit and power is not present, momentarily press the ON/STANDBY
button ( ) and release the button after the UPS emits a beep.


To perform the UPS Start-On-Battery operation when the unit is
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plugged in and operating in the STANDBY mode, press the
ON/STANDBY button (
beep; press the ON/STANDBY button a second time and release the
button after the UPS emits a beep.
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Figure 3-3. Selecting Start-On-Battery Operation using the ON/STANDBY
button ( )


) and release the button after the UPS emits a