Industrial Engineer · phase 11 of 16
Flying Start / Catch on the Fly
Function that detects the speed and direction of a spinning motor before smoothly taking control.
The Explain card
- Plain English
- Flying start lets the drive take control of a motor that is already spinning. It searches for the motor's speed and direction, matches its output to them, and then ramps to the setpoint.
- Example
- A fan is windmilling backwards in a duct when a run command arrives. With flying start the drive finds it turning in reverse, catches it, and brings it around smoothly.
- Why it matters
- Without it the drive starts at zero hertz against a spinning motor, which is an instant overcurrent or overvoltage trip. Fans, pumps in a manifold and anything restarted after a brief power loss usually need it enabled.
- Hook
- Catch the motor where it is, then take it where you want it.
Where it sits in the deck
Phase 11: VFD Control Modes and Tuning
How a drive decides what to send the motor, from plain volts per hertz up to closed loop vector control, and how each mode is tuned.
