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15. Functional Description
15.1 Basic Operation
(1) Normal Operation
In normal operation, the UPS switches automatically
*
between the three modes (a) to (c)
depending on the state of the power.
*
The UPS does not switch automatically when item
①
“UPS operation mode” in
§
10.1
“Setup Menu Item List” is set to “Double Conversion” or “Economy”.
(a) Active Filter mode
The UPS operates in Active Filter mode when the input power voltage is within a
certain range and the output power factor is below a certain value. In Active Filter
mode, the UPS receives power from the utility power source and supplies it to the load.
At the same time, it compensates for high frequencies in the input power at the
inverter. The batteries are kept continually charged and ready in case a problem
(outage or voltage drop) occurs in the utility supply.
Power supply route in
Active Filter
mode
Indications by LEDs
(b) Double Conversion mode
The UPS switches to Double Conversion mode when the input power voltage is outside
a certain range. In Double Conversion mode, the UPS converts AC power from the
utility power source into DC power through the rectifier, and reconverts this DC power
back into AC power through the inverter and supplies it to the load. The output power
is stable AC power synchronized with the input power source. The batteries are kept
continually charged and ready in case a problem (outage or voltage drop) occurs in the
utility supply
Power supply route in Double Conversion mode Indications by LEDs
Utility
power
Output
Converter
Rectifier
Inverter
Charger
Batteries
Utility
power
Output
Converter
Rectifier Inverter
Charger
Batteries