The setpoint is set up by most likely who started it and can be ajusted at any time or even disable for any reason , and yes there are circumstances that can effect the way it operates the setpoint once set would not change in those events its just trying to maintain its target setpoint.
A mind is like a parachute. It doesn't work if it is not open.
The best part of going to work is coming back home at the end of the day.
Hard work spotlights the character of people: some turn up their sleeves, some turn up their noses, and some don't turn up at all.