TRICONEX 7400213-100 9760-210 8312 端子接口模块

TRICONEX 7400213-100 9760-210 8312 端子接口模块

TRICONEX 7400213-100 9760-210 8312 端子接口模块

TRICONEX  7400213-100 对于比例(P)控制器，振荡周期为2至5个死区时间；对于圆周率，它是3到5；对于PID大约3个周期。这在流动回路中导致1至3秒的振荡周期；在水平循环中，3到30秒；在压力回路中，5至100秒；在温度循环中，30到20分钟；在分析循环中，从几分钟到几小时。对于没有死区时间的非交互PID回路，可以将积分(I)设置为等于振荡周期的50%,将微分时间(D)设置为该周期的大约18 %。

开环调谐的优点包括它的速度(你不需要等待几个周期)，扰动幅度的大小是可预测的，并且测试可以在控制回路安装之前进行。缺点包括只确定过程动态(不确定回路部件的动态贡献),以及在有噪声的过程中，反应曲线的拐点难以确定。我通常做的是通过开环方法选择初步设置，然后用闭环方法进行优化。

TRICONEX 7400213-100 9760-210 8312 端子接口模块

TRICONEX 7400213-100 Oscillation period of 2 to 5 dead time for proportional (P) controllers; For PI, it's 3 to 5; About 3 cycles for PID. This results in an oscillation period of 1 to 3 seconds in the flow loop; In a horizontal loop, 3 to 30 seconds; In the pressure loop, 5 to 100 seconds; In the temperature cycle, 30 to 20 minutes; In the analysis cycle, from minutes to hours. For a non-interactive PID loop with no dead time, the integral (I) can be set to equal 50% of the oscillation period and the differential time (D) to approximately 18% of that period.

The advantages of open-loop tuning include its speed (you don't need to wait several cycles), the magnitude of the disturbance amplitude is predictable, and testing can be done before the control loop is installed. Disadvantages include determining only the process dynamics (the dynamic contribution of the loop components is uncertain), and the difficulty of determining the inflection point of the response curve in a noisy process. What I usually do is select the initial setup through the open loop method and then optimize it with the closed loop method.