Published: 03/14/2006
| Question: | Power Line Harmonics and Installation Considerations for AC and DC Drives |
| Answer: | Yaskawa General-Purpose Inverter Technical Information
| Classification | Precautions on Application | Model | GN | Document No. | YEA-P-01-GN-01 |
| Title | Power Line Harmonics Considerations for DC Drives and AC Drives |  | | | |
Power Line Harmonics and Installation Considerations For AC and DC Drives
This paper discusses the differences between DC and AC drive rectifiers and compares several harmonic mitigation methods for AC drives. DC drive Retrofit considerations are also discussed.
It is known that harmonic currents on an AC power line can be caused by the rectifier switching circuits in inverters. Harmonics are defined as currents or voltages with frequencies that are integer multiples of the fundamental power frequency. This harmonic current of AC drives can be controlled by adding an AC line reactor (ACL) or a DC link reactor (DCL) to the power circuit.
Yaskawa F7 Drives provide a built-in bus choke above 30HP as well as 12-pulse rectification above 30HP which can reduce input current harmonic distortion by over 90%. Yaskawa F7 drives 25 HP and below offer an optional DC Link choke. The Yaskawa F7 drive meets or exceeds generally accepted power quality standards. Phase-to-phase, phase-to-neutral, short circuit and ground fault protection are provided in the F7 drive. These features are useful when retrofitting a SCR based DC drive.
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Product Information:
| Product Group: | Inverters/Drives |
| Product: | F7 Drive |
| Applications: | |
| Category: | Harmonics; Isolation Transformers; Power Quality; Reactors |
Other Information:
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Please read and understand the product instruction manual before installing, servicing or operating Yaskawa products. FAQ content and illustrations are provided as technical advice to augment the information in manual, not superceed it. It is not possible to give detailed instructions for all types of installation or support activities. The information described in the FAQs are subject to change without notice to improve the product or FAQ. Yaskawa assumes no responsibility for errors or omissions or damages resulting from the use of the information contained in any FAQ.
All warnings, cautions and product instruction for product use must be followed. Installation, operation and maintenance should be carried out by qualified personnel. Failure to observe these and other precautions highlighted in the product manuals will expose the user to high voltages resulting in, serious injury or death. Qualified personnel are defined as individuals who are familiar with the installation, starting, operation and maintenance of Yaskawa products of the type described and have proper qualifications to perform the work.
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