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Automation and Drives - SCE
T I A Training Document Page 16 of 64 Module
2.5.4 Proportional Controlled System with n Time Delays
The controlled system is called P-Tn system for short.
The time response is described with a differential equation of the nth degree.
The characteristic of the step response is similar to that of the P-T2 system. The time response is
described through Tu and Tg.
Substitute: The controlled system with many delays can be approximately substituted with the series
connection of a P-T1 system with a dead time system.
The following applies: Tt » Tu and TS » Tg.
Substitute step response for the P-Tn system
Preface Fundamentals Discontinuous Action Controller Controller Block (S)FB41 Setting the System Appendix
B3
Issued: 02/2008 Control Engineering with STEP 7