Product User Manual
Operating Instructions, Version AE 12/2009, A5E01454341C
17
Overview
2
The Siemens Perfect Harmony series of Medium Voltage (MV) Pulse Width Modulated
(PWM), Variable Frequency Motor Drives (VFD) are designed and manufactured by
Siemens LD-A, New Kensington, PA, USA with additional manufacturing facilities in Europe,
Asia, and South America. The Harmony VFD is intended for use with standard medium-
voltage three-phase AC induction, synchronous, wound rotor, permanent magnet, or super
conducting motors. When any of these types of motor is connected to a utility supply at a
fixed frequency (i.e., 60 or 50 Hz), the motor runs at a single speed. The Harmony series of
drives allow variable speed motor operation, without sacrificing any of the desirable
properties of the motor.
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