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Chapter 12 Helpful information
voltage crosses a preset low or high threshold value and uses transformers to boost or lower
the voltage by a set amount to return it to the acceptable range.
In "line" mode (i.e. when not operating from battery), line-interactive UPS systems typically
regulate output within ±8 – 15 % of the nominal voltage (e.g. 120, 208, 230 or 240 volts). On-
line UPS systems typically regulate voltage within ±2 – 3 %.
During an outage, line-interactive UPS systems typically transfer from line power to battery-
derived power within two to four milliseconds, which is more than fast enough to keep all but
a small percentage of the most power-sensitive equipment operating without interruption.
When operating from battery power, a line-interactive UPS system generates the waveform of
its AC output.
A line-interactive UPS unit can only compensate for a limited set of utility power problems. It is
strongly recommended to install voltage and frequency stabilisers in order to avoid damage or
incorrect operation of the UPS unit.
Line interactive UPS units protect for 5 common power issues – Power Failure, Power Sage,
Power Surge, Under voltage, and Over voltage.
Power failure
Under voltage
6U Rack or Tower UPS RT8kVA and RT11kVA IUOMG
Power sag
Over voltage
Power surge
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