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Advantages of a pure sine-wave Genesis XM Series UPS over conventional square wave
or modified sine wave UPS Systems / Inverters
The output voltage of a sine-wave XM Series UPS has a sine wave-form of the mains / utility
voltage. In a sine wave, the voltage rises and falls smoothly with a smoothly changing phase angle
and also changes its polarity instantly when it crosses 0 Volts.
In a square wave, the voltage rises and falls abruptly, the phase angle also changes abruptly and it
sits at 0 Volts for some time before changing its polarity. Thus, any device that uses a control
circuitry that senses the phase (for voltage / speed control) or instantaneous zero voltage crossing
(for timing control) will not work properly from a voltage that as a modified sine wave-form or
square wave.
Also, as the modified sine wave is a form of square wave, it is comprised of multiple sine waves of
odd harmonics (multiples) of the fundamental frequency of the modified sine wave. For example, a
50 Hz modified sine wave will consist of sine waves with odd harmonic frequencies of 3
rd
(150
Hz), 5
th
(250 Hz.), 7
th
(350 Hz.) and so on. The high frequency harmonic content in a modified sine
wave produces enhanced radio interference, higher heating effect in motors / microwaves and
produces overloading due to lowering of the impedance of low frequency filter capacitors / power
factor improvement capacitors.
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General