Siemens Module B3 manual Proportional Controlled System with Two Time Delays

Page 15

Automation and Drives - SCE

2.5.3Proportional Controlled System with Two Time Delays

The controlled system is called P-T2 system for short.

Figure: Jump Response of the P-T2 system

Tu: Delay time Tg: Transition time

The system consists of the reaction-free series connection of two P-T1 systems that have the time constants TS1 and TS2.

Controllability of P-Tn systems:

Easy to		Can still be
Easy to		Can still be		Difficult to control
control		controlled		Difficult to control
control		controlled

With the rising ratio Tu/Tg, controlling the system becomes more and more difficult.

	Preface	Fundamentals	Discontinuous Action Controller Controller Block (S)FB41	Setting the System Appendix

	T I A Training Document		Page 15 of 64	Module
				B3
Issued: 02/2008				Control Engineering with STEP 7

Image 15

Contents Module B3 Automation and Drives SCE Table of Contents Automation and Drives SCE Prerequisites To 3 days Module C To 3 days Module DFrequency Converter at Simatic S7 Learning ObjectivePLC Hardware and software requiredTasks of Control Engineering Fundamentals of Control EngineeringComponents of a Control Loop Controlled VariableFeedback Variable r Controlling Element Disturbance Variable zSetpoint Value w Comparing ElementActuator Controlled SystemDead Time Characteristics Step Function for Examining Controlled Systems ForAutomation and Drives SCE Time constant Proportional Controlled System with a Time DelayProportional Controlled System with Two Time Delays Tu Delay time Tg Transition timeControllability of P-Tn systems Proportional Controlled System with n Time Delays Controlled Systems without Inherent Regulation Types of Controllers Two Position Controllers Hysteresis Switch-On Value Manipulated Variable TimeThree Position Controllers Basic Types of Continuous Controllers Proportional Controllers P-Controller Automation and Drives SCE Integral Action Controllers I- Controller WithController Layout PI ControllersPID Controllers Derivative Action Controllers D-ControllerObjectives for Controller Adjustment 450.85 Digital Controllers DAC Preface Fundamentals YES StructogramExercise Assignment List Symbol Address CommentNetwork Possible Solution for the PLC ProgramD24/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 FB 41 Contc UseDescription 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 General Tu-TgApproximationT g Approximation Setting the PI-Controller according to Ziegler-Nichols For setpoint characteristic MAN Solution of the PLC program Setpoint Setting the PI controller according to Ziegler-NicholsAppendix Diagram of the controller blockComrst Bool False Input Parameters Data Value Range Default Description TypeParameter Data Type Value Range Default Lmnhlm Real Lmnllm Output Parameters Parameter Data Value Range Default Description Type