Siemens Module B3 manual 450.85

Page 28

Automation and Drives - SCE

-Note down the Kp value that has been set as the critical proportional coefficient.

-Specify the duration of a complete oscillation as Tkrit, perhaps with a stop watch by generating the arithmetical mean over several oscillations.

-Multiply the values of Kp,krit and Tkrit with the multipliers according to the table, and thus set the determined values for Kp, Tn and Tv at the controller.

0.50

0.450.85

0.59

 

0.50

 

0.12

 

 

 

 

 

 

Preface

Fundamentals

Discontinuous Action Controller Controller Block (S)FB41

Setting the System Appendix

 

 

 

 

 

 

 

T I A Training Document

Page 28 of 64

Module

 

 

 

 

B3

Issued: 02/2008

 

 

Control Engineering with STEP 7

Image 28
Contents Module B3 Automation and Drives SCE Table of Contents Automation and Drives SCE To 3 days Module C To 3 days Module D Frequency Converter at Simatic S7Learning Objective PrerequisitesHardware and software required PLCFundamentals of Control Engineering Tasks of Control EngineeringControlled Variable Components of a Control LoopFeedback Variable r Disturbance Variable z Setpoint Value wComparing Element Controlling ElementControlled System ActuatorDead Time Characteristics For Step Function for Examining Controlled SystemsAutomation and Drives SCE Proportional Controlled System with a Time Delay Time constantTu Delay time Tg Transition time Proportional Controlled System with Two Time DelaysControllability of P-Tn systems Proportional Controlled System with n Time Delays Controlled Systems without Inherent Regulation Types of Controllers Two Position Controllers Switch-On Value Manipulated Variable Time HysteresisThree Position Controllers Basic Types of Continuous Controllers Proportional Controllers P-Controller Automation and Drives SCE With Integral Action Controllers I- ControllerPI Controllers Controller LayoutDerivative Action Controllers D-Controller PID ControllersObjectives for Controller Adjustment 450.85 Digital Controllers DAC Preface Fundamentals Structogram YESAssignment List Symbol Address Comment ExercisePossible Solution for the PLC Program NetworkD24/AIFillSetpNorm/Norm.value for level setpoint Network 10 Title Task Definition for PID Standard Controller Function Diagram of the control system with a PID controller Use FB 41 ContcDescription Exercise Example Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE SP INT PLC’ Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE Tu-TgApproximation GeneralT g Approximation Setting the PI-Controller according to Ziegler-Nichols For setpoint characteristic MAN Solution of the PLC program Setting the PI controller according to Ziegler-Nichols SetpointDiagram of the controller block AppendixInput Parameters Data Value Range Default Description Type Comrst Bool FalseParameter Data Type Value Range Default Lmnhlm Real Lmnllm Parameter Data Value Range Default Description Type Output Parameters