After changing the parameters, I recommend saving them to the controller and then reading them back again from the controller to make sure that they have been saved correctly.
After confirming that the changes have been accepted correctly, the USB lead should be disconnected before powering up the controller to ensure the controller does not remain in programming mode
(which I believe is usually a series 16 beeps - not "endless signals") .
I am pretty sure that the single beep
(not a series of single beeps) is normal for the VEC200 controller when it is first powered up, but as I don't have one to test, I cannot confirm this.
The motor should respond to throttle movement for at least one of the four combinations of the
Throttle mode selection and the
Speed throttle type, but if it still does not respond, I suggest that you then start by checking the throttle signal output voltage between the Green & White and the Black & White throttle wires to confirm that it varies between ~1V and ~4V from maximum Reverse to maximum Forward position of the throttle.
If the throttle signal does not vary as expected, the throttle may be incorrectly wired or there could be a poor connection somewhere.
If there is no voltage whatsoever on the Green & White throttle signal wire, check for 4~5V on the Red & White +5V supply to the throttle
(measured relative to the Black & White Throttle Ground wire).
I don't know what values you currently have for the throttle, but some typical throttle voltages are shown below:
Unfortunately, I don't know what else to suggest.
Alan