and process applications like pumps, fans, compressors, and conveyors. Numerous optional components include input filters, input and output reactors, braking resistors, and so on. Delta Electronics has also adapted the 61800-9 methodology and reports IE2 efficiency for its 1.7, 3.0, 4.2, 6.6, 9.9, and 12.2 kVA MS300 Series compact drives. The data is detailed in a tabular format rather than as a chart. The MS300 series includes drives from 0.2 to 22 kW (Figure 5). These drives feature several built-in features, including a programmable logic controller (PLC) function for programming, MODBUS communication, a communication slot that can support additional protocols, and a USB port for uploading and downloading data. Omron reports its “variable speed drives with three phases input,” like the MX2 Series VFDs, meet the requirements of IE2 efficiency. The company provides the test data as an Excel file. MX2 drives are available with ratings from 0.1 to 2.2 kW for 200 V single-phase input, 0.1 to 15.0 kW for 200 V three-phase input, and 0.4 to 15.0 kW for 400 V three-phase input. These drives are designed for IM and PM motors and support smooth control down to zero speed with 200% starting torque at 0.5 Hz.
Figure 4: Efficiency class IE2 7.5 kW CDM that has 36.1% lower losses compared with the reference converter (90% / 100%). The percentages show the losses in relation to the rated power of the basic drive without optional components. (Image source: Siemens)
Figure 5: Delta Electronics’ MS300 series includes 0.2 to 22 kW drives. (Image source: Delta Electronics)
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