Perfect Harmony GENIII/e User’s Manual
Introduction
A1A19000405A: Version 1.3
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1.1 Introduction to the Perfect Harmony
The Perfect Harmony is a series of pulse-width modulated, variable frequency AC motor drives designed and
manufactured by Siemens LD A. The Perfect Harmony drive system addresses the following power quality issues:
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Providing clean power input
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Providing a high power factor
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Providing nearly perfect sinusoidal output.
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Clean Power Input
The Perfect Harmony drive series meets the most stringent IEEE 519-1992 requirements for voltage and current
harmonic distortion, even if the source capacity is no larger than the drive rating. This series protects other on-line
equipment (such as computers, telephones, and lighting ballasts) from harmonic disturbances. Perfect Harmony also
prevents “cross talk” with other variable speed drives. Clean power input eliminates the need for time-consuming
harmonic/resonance analyses and costly harmonic filters. Figure 1-1 illustrates harmonic distortion waveforms for a
typical 6-pulse, a typical 12-pulse, and the Perfect Harmony series drive.
Figure 1-1: Harmonic Distortion Wave Form Comparisons (6-pulse, 12-pulse, and Perfect Harmony)
Total harmonic distortion of the source current is 25% for the 6-pulse, 8.8% for the 12-pulse, and 0.8% for the Perfect
Harmony. The corresponding voltage distortions with a typical source impedance are 10%, 5.9%, and 1.2%,
respectively.
CHAPTER
1
Introduction
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Note:
The above comparisons were done using a typical 1000 Hp current source drive (6-pulse
and 12-pulse modes), and a Perfect Harmony series drive operating from an 1100 kVA, 5.75%
impedance source.
Source Current
Source Current
Source Current
Source Voltage
Source Voltage
Source Voltage
Typical 6-pulse
Input Waveform
Typical 12-pulse
Input Waveform
Perfect Harmony Series
Input Waveform
Summary of Contents for PERFECT HARMONY GENIII/E Series
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