Instruction Manual
1
EN
Chapter 1 Brief introduction
1.1 Product introduction
PowerWalker VFI 3/3 Series products are high-efciency and high-performance, double-
conversion three phase input and three phase output UPS, unit capacity ranging between
20KVA-40KVA. Categorized by capacity, the products can be further divided into 20KVA,
30KVA and 40KVA. This series not only provides perfect solution for power source pro-
tection and successfully solves problems such as blackout, boost, brownouts, sags, decay-
ing, oscillation, high voltage impulse, voltage uctuations, surges, harmonic distortion,
disturbances, frequency fluctuation etc, but also enhances adaptability to complicated
working environments so that the application elds is well extended to computer equip-
ments, communication equipments and other controlling equipments with good adapt-
ability to complicated industrial environments as well. Therefore, The Series products can
be applied in a diversied multi-industries eld such as telecommunications, nancing,
transportation, government, manufacturing and energy sectors.
PowerWalker VFI 3/3 Series products are also capable of ECO mode. Under ECO mode,
UPS is powered by AC supply while in case of abnormal AC supply UPS will be sup-
plied by accumulator battery after conversion through inverter. As the energy conversion
efciency reaches as high as 98% under ECO mode when there is normal AC supply, the
energy saving effect of UPS is remarkable. Meanwhile, when UPS inverter is at start-up
mode but without power output, which is similar to hibernation mode, the inverter life
term can be largely extended. At normal AC supply, except that ECO mode displays a
relatively poorer power delivery quality compared to normal double conversion mode, it
is capable of satisfying the needs of most power-driven equipments in today’s AC network
incorporation.
Remark: under ECO mode, conversion time of 0ms mode is not guaranteed and it is ap-
plicable only to single machine.
The following symbols will be frequently used in this User Manual as well as in the pro-
cess of actual application, therefore, correct identication and understanding of their con-
notations prove necessary.
1.2 Frequently used symbols