PPD512A10-150000 ABB

◆The influence of the change of the proportionality P value,the larger the proportionality,the weaker the proportional effect,which makes the transition curve change slowly;the oscillation period lengthens;the attenuation ratio becomes larger.Therefore,when there is disturbance or changing the given value to make the curve recover slowly,the proportionality P value can be reduced.

◆Influence of integral time I:The strength of integral action depends on the size of integral time I.When I is large,the integral effect is weak,and when I is small,the integral effect is strong.The general trend of change is that the smaller I is,the stronger the integral action is,the more intense the curve oscillation is,the shorter the period,and the smaller the residual.But if I is too small,because the integral action is too strong,the curve will oscillate violently,but the time for eliminating the residual will be longer.

◆Influence of differential time D:The strength of differential action mainly depends on the size of differential time.The larger the D,the stronger the differential action,which is just the opposite of the integration time.The stronger the differential action is,the stronger the regulating action is,and the result is that the oscillation becomes more intense and the period becomes shorter and shorter.

◆比例度P值变化的影响，比例度越大，说明比例作用越弱，使过渡过程曲线变化缓慢；振荡周期加长；衰减比变大。因此在有干扰或改变给定值使曲线恢复缓慢时，可将比例度P值变小。

◆积分时间I的影响：积分作用的强弱取决于积分时间I的大小。I大时，积分作用弱，I小时，积分作用强。一般变化趋势是I越小，积分作用越强，曲线振荡加剧，周期缩短，余差越来越小。但如果I太小，由于积分作用太强，会造成曲线剧烈振荡，反而使消除余差的时间变长。

◆微分时间D的影响：微分作用的强弱主要看微分时问的大小。D越大，微分作用越强，这和积分时间刚好相反。微分作用越强，调节作用越强，其结果使振荡越来越剧烈，周期也越来越短。