OMD10078 rev F
9
capacitors, a low-pass filter that provides to eliminate the high frequency ripple and
keep the total harmonic distortion (THD) of voltage lower than 2% (with linear load).
The inverter, thanks to its manufacturing technology and to the microprocessor
control, is able to supply indifferently inductive or capacitive loads. . In case the load is
highly capacitive (p.f. < 0.9) contact the sales department to verify whether a slight
power de-rating is necessary or not.
1.2.1 Operation with non-linear load
A non-linear load is characterized by a high peak current versus its RMS value, that
in normal condition would introduce a distortion on the output voltage waveform. The
inverter is provided with an instantaneous voltage correction facility, completely
managed by the microprocessor, that provides to vary the PWM generation according to
the actual output waveform, in order to keep the THD within 5% even with loads having
crest factor equal to 3.
Picture 5 – Operation with non-linear load
