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9
Basic Operation
continued
Other UPS Features (Rear Panel)
Input Breaker
Prevents high input current from damaging the UPS or the attached load. If this
breaker trips, make sure your UPS is connected to nominal 120V AC power
before resetting the circuit breaker by pushing the breaker switch in to reset.
Power Sensitivity/Lowline Adjustment
This dial is normally set fully counterclockwise, which enables the UPS to protect
against waveform distortions in its AC input. When such distortion occurs, the
UPS will normally switch to providing pure sine wave power from its battery
reserves for as long as the distortion is 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. You may be able to reduce how
often your UPS switches to battery due to waveform distortion or brownouts by
experimenting with different settings for this dial. As the dial is turned clock-
wise, the UPS becomes more tolerant of variations in its input power’s AC wave-
form and reduces the voltage point at which it switches to battery. NOTE:The fur-
ther the dial is adjusted clockwise, the greater the degree of waveform distortion
and the lower the input voltage the UPS will allow to pass to connected equip-
ment. When experimenting with different settings for this dial, operate con-
nected 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.
NORM DELAY
200210187 Smart 700-1000 RM1U Owner’s Manual 93-2102.qxd 11/1/2002 9:50 AM Page 9