日本神港SHINKO温度控制调节器BCR2A00-36
价格:面议
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日本神港SHINKO温度控制调节器功能
● RFB(Reset Feed Back)限幅器
测量值(PV)与设定值(SV)的偏差长时间持续的场合,PID演算结果会出操作量的有效范围(0~)。特别是积分(I)输出值大过了需要、即使偏差变小了,实行修正动作也慢。
RFB限幅器是当PID演算结果过了限幅点()的场合,为了使PID演算结果经常在有效范围内把过的部分反馈成积分值,使演算结果保持在限幅点而进行修正动作。
●arw(Anti Reset Windup)
PID控制的场合,如果从控制对象起动时就使积分(I)动作起作用的话,就会产生很大的上冲。
ARW是通过限制积分动作(I)的生效范围,抑制上冲的功能。积分动作仅在消除残留偏差时起作用即可,所以在比例带内减小积分动作起作用的范围,可把上冲抑制在小。
有关警报
● 偏差警报
偏差[测量值(PV)-设定值(SV)]达到警报设定时为警报状态。
警报设定值的伴随设定值而变化。
● 输入值警报
测量值(PV)达到警报设定时为警报状态。
日本神港SHINKO温度控制调节器功能
鉴此,只要有偏差,积分动作就为了消除偏差起作用,进而消除残留偏差。
积分动作的强弱用积分时间表示。积分动作所产生的输出(操作量)与比例动作产品的输出(操作量)相等时所经过的时间叫积分时间。
积分时间越短,积分效果越强。积分时间越长,积分效果越弱。
如果积分效果太强,则易发生振荡,不稳定。
● 微分动作(D动作)
按照与发生偏差(设定值和测量值的差)的速度成比例的操作量进行控制,用于防止偏差的变大于未然的动作叫微分动作(D动作)。
微分动作的强弱用微分时间表示。微分时间为微分动作所产生的输出(操作量)与比例动作产生的输出(操作量)相等时所经过的时间叫微分时间。
微分时间越长,微分效果越强。微分时间越短,微分效果越弱。
如果微分效果太强,即使偏差的变化小,也出现大的输出变化,发生振荡,而不稳定。
-/gjeibb/-