Low Harmonic Technology

The unique low-harmonics design sets the SED2 VFD Drive apart from its competitors. While other drive manufacturers use filtering devices to control harmonics, which add cost and complication, the SED2 VFD Drive design provides a new method of reducing the input line harmonic currents without the addition of extra components. The SED2 drive uses lowered DC link capacitance to minimize harmonics in a cost-effective manner.

Current Wave Form of Typical 6 Pulse Drive vs. the SED2 VFD

At the input terminal of a PWM 6 Pulse Drive, THD can be in excess of 120% without any filtering. The SED2 produces only 29%.

In tests between a typical 6 pulse PWM drive with and without line reactors and DC link chokes versus the SED2 VFD, the Siemens Easy Drive demonstrates superior harmonic performance. In typical HVAC applications, the SED2 VFD can reduce harmonics by up to 25% more than other VFDs even with line reactors and DC link chokes.

Easy-to-install and use, Harmonee is a powerful harmonics analysis tool. Just enter the job-site specific data and let Harmonee create harmonics analysis data for that facility, including:

A Harmonee Tutorial has been written to walk you through, step-by-step using the new tool. The Tutorial will help you interpret your data and will show you all of Harmonee's capabilities!