The different types of adjustable speed industrial motors
Figure 3: IEC 61800-9 PDS operating points and efficiency classes. (Image source: Schneider Electric)
components is beyond the control of VFD makers, and 61800-9 doesn’t apply directly to VFDs. Some VFD makers have adapted the 61800-9 methodology. When IE2 compliance is claimed, the data is reported in various formats, including charts, tables, and Excel files.
Instead of using the 25% changes of the IE classes, IES classes are based on 20% changes. A PDS with an efficiency class IES2 has greater than 20% lower losses, and a class IES0 PDS has greater than 20% higher losses than the RPDS performance defined as IES1 (Figure 3). VFD examples VFD makers don’t always report efficiency based on 61800-9. That’s because the simplest efficiency measurement using IEC 61800-9 is for the CDM, which consists of the VFD (frequency inverter) plus numerous additional components, including the feeding section and input and output auxiliary devices. The use of specific additional
For example, Siemens uses the IEC 61800-9 methodology with its SINAMICS V20 drives and reports them as efficiency class IE2 (Figure 4). These drives are offered in nine frame sizes, ranging from 0.16 to 40 horsepower (hp). These drives have been optimized for basic drive systems in manufacturing
32
Powered by FlippingBook