Sine-wave filters are available in the voltage range from 380 V to 480 V up to a power of 250 kW and in the voltage range from 500 V to 600 V up to a type rating of 132 kW.
The sine-wave filter at the converter output supplies almost perfect sinusoidal voltages on the motor so that standard motors can be used without special cables or derating. Standard cables can be used. The maximum permissible motor feeder cable length is 300 m. The maximum output frequency is 150 Hz.
Note: The pulse frequency of the converter must be increased when a sine-wave filter is used. This reduces the power available at the converter output (derating factor approx. 0.88). The output voltage control factor is reduced to approximately 85 % (380 V to 480 V) or to approximately 81 % (500 V to 600 V). It must be noted that the reduced voltage at the motor terminals compared to the rated motor voltage means that the motor reaches the field weakening range earlier.
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