That’s one of the things the vfd does.
Connect 1 phase to input.
Connect 3 phase to motor.
Connect timer to vfd on/off terminals.
That’s It!
Set maximum speed of motor.
Set to ramp up over 5 minute period.
Set to ramp down over x minute period.
To start cycle. Set timer to total run time less ramp down time.
Spin cycle will start at 0 rpm when timer is turned.
Ramp up for 5 minutes.
Run at full speed until timer runs out.
Ramp down to 0 rpm at the ramp down rate.