PLC glossary
VFD
An electronic drive that changes a motor's speed. The controller can request a speed rather than only ON or OFF.
- Also called
- Variable Frequency Drive, variable-speed drive, VSD, inverter drive
- On site
- A water pump slows down when the building needs less water.
- Siemens
- A drive exchanges commands and status with the PLC; SINAMICS is a Siemens drive family.
- Rockwell
- A drive exchanges commands and status with the controller; PowerFlex is a Rockwell drive family.