FAQ: Are common multimeters able to measure the correct output voltage of the VFD?
Breadcrumb
Contact Us
contactUsAction
Many true RMS meters display readings 20 to 30% higher than the drive's controller display as most of true RMS digital multimeters have wide bandwidth. These multimeters are measuring the carrier frequency/switching frequency generated by VFDs. The low pass filter (LPF) is designed to help block unwanted voltages above 1 kHz when measuring AC voltage or AC frequency. The LPF can improve measurement performance on composite sine waves that are typically generated by inverters and variable frequency motor drives.
Please see the attached for additional support links.
SAFETY PRECAUTIONS AND INSTRUCTIONS FOR USE OF FAQ INFORMATION!
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 supersede 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.
Phone
If you have an urgent request, please call: 1-800-YASKAWA (927-5292) or 1-847-887-7000.Electronically
To contact us electronically, please select your type of request and complete the form.Yaskawa America, Inc. - Drives & Motion Division
2121 Norman Drive South
Waukegan, IL 60085