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Answer Posted / kyle condran
derivative works on rate of change of error(slope of error) and assumes that the process will continue changing at that rate and tries to overcompensate for it.
so for fast processes upsets or step changes have high error slopes, sometimes almost infinite or straight up, so the control goes nuts trying to compensate for error. There is usually an option to suppress derivative is for step changes but for fast processes is should be zero.
You will see derivative on laggy slow processes such as some temperature and large volume level loops.
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