Variable frequency drive (VFD)
IEC 60617 (single-line diagram symbols)
Drawn as
A square split by a diagonal, with "~" in both halves (an AC/AC converter), feeding a motor.
Meaning
Variable-speed drive for large pumps, compressors and fans. Becomes vfd-cabinet.
Variants
- Some legends draw two boxes: rectifier (~/=) then inverter (=/~)
- Often written VSD
Tags
VFD · VSD · U