■ C3 for drive systems for rated voltages < 1000 V for exclusive use in the second environment ■ C4 special requirements for drive systems for rated voltages ≥ 1000 V and rated currents ≥ 400 A in the second environment Generic line filters are available, but like line reactors, line filters are often designed for use with specific drive families. For example, the VW3A4708 line filter from Schneider Electric is rated for 200 A (Figure 5). It’s designed for the company’s Altivar VSDs and Lexium servo drives. It’s rated for mains voltages from 200 V AC to 480 V AC and has a protection index of IP20. Its EN 61800-3 rating depends on the motor cable length:
■ Category C1 using up to 50 m of shielded cable ■ Category C2 using up to 150 m of shielded cable ■ Category C3 using up to 300 m of shielded cable Conclusion VSDs and VFDs are important systems for maximizing the efficiency of industrial operations and minimizing greenhouse gas emissions. These drives require several support components to ensure effective and reliable installations that meet the relevant international standards, including VFD cables, output reactors, braking resistors, line reactors, and line filters.
Figure 5: 200 A line filter rated for mains voltages from 200 V AC to 480 V AC . (Image source: Schneider Electric)
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