Note that panning is controlled by the PAN MODE SWITCH and the PAN MODE KNOB. (Unfortunately, my H+ is on its way to Yuneec so I can not test out what I'm about to state, but I THINK it is correct...)
If the PM switch is in the middle position (Follow Pan) then the rotation will stop where the knob points, if the PM Switch is in the down position (Global Mode), the rotation will continue.
Below is text copied from
@ogrench 's H+ updated user's manual:
Pan Mode switch
Is a 3-position switch, located on the upper left (center) on the ST16s and controls how the Pan Control knob with function/operate.
In the up position, is Follow Mode.
➢ Moves the Gimbal to 0 degrees – i.e. face the front of the aircraft.
➢ The Pan Control Knob for the Gimbal (Camera) is disabled.
[The camera is locked facing the front and as such follows the front of the aircraft’s movements.]
In the middle position, is Follow Pan Controllable Mode.
➢ The Pan Control Knob is enabled,
➢ Use the Pan Control knob to set the pan position of the Gimbal (Camera), it will stay fixed to that position regardless of the aircraft’s movements.
In the down position, is Global Mode.
➢ The Gimbal (Camera) will rotated in the direction you turn the Pan Control knob [left or right] and will continue to turn in that direction.
➢ The greater the distance from midpoint the faster the Gimbal (Camera) will rotate. ➢ This position also provides for special operation of the Gimbal in CCC Task mode.
Pan Control Knob
A rotary control knob located on the upper left of the ST16s. The Gimbal (Camera) will rotated in the direction you turn the Pan Control knob [left or right].
Normal position of Pan Control is in the Middle, Camera is at 0o degrees (i.e. facing forward on aircraft).
Use the Pan Control knob to set the position of the Gimbal (Camera) or to set speed of rotation when Pan Mode switch is in the Global position.