VFD vs VSD: Are They The Same? Understanding The Differences
According to NEMA’s ICS 61800 standards series, published jointly with the IEC, the formally recognized term for electronic motor speed control is Adjustable Speed Drive (ASD), not VFD or VSD. That detail is worth knowing because it explains why so much confusion exists: “VFD” and “VSD” are industry shorthand, not interchangeable standards-defined terms, and the […]