Tripp-Lite SmartPro SMART550USB Manuel Du Propriétaire page 8

Basic Operation
Power Sensitivity Adjustment: This dial is normally set fully counterclockwise,
which enables the UPS to protect against waveform distortions in its AC input.
When such distortions occur, the UPS will normally switch to providing PWM
sinewave power from its battery reserves for as long as the distortions are
present. In some areas with poor utility power or where the UPS's input power
comes from a backup generator, frequent brownouts and/or chronic waveform
distortion could cause the UPS to switch to battery too often, draining its
battery reserves. It may be possible to reduce how often the UPS switches to
battery due to waveform distortion or brownouts by experimenting with different
settings for this dial. As the dial is turned clockwise, the UPS becomes more
tolerant of variations in its input power's AC waveform and switches to battery
less often.
Note: The further the dial is adjusted clockwise, the greater the degree of waveform
distortion the UPS will allow to pass to connected equipment. When experimenting with
different settings for this dial, operate connected equipment in a safe test mode so that
the effect on the equipment of any waveform distortions in the UPS's output can be
evaluated without disrupting critical operations. The experiment should last long enough
to assure that all expected line conditions are encountered.
Automatic Voltage Regulation (SMART550USB and SMART750USB Only):
During brownouts, the UPS will automatically correct low AC line voltage. When
automatic voltage regulation is operating, the UPS may click gently. This is a
normal, automatic operation of the UPS, and no action is required.
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