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RT 380 Optimization of control loops



  • Closed-loop control system response
  • Choice of optimum controller parameters
  • Tuning rules such as Ziegler-Nichols
  • Stability and transient response
  • Software simulation of controlled systems


Technical Description

This experimental unit with the interaction between controller and controlled system, the objective being for the closed control loop, comprising the controller and the controlled system, to exhibit the desired optimum response. The setting of controller parameters - a key practical aspect - can be practised safely and intensively using simulation software. Concepts such as open and closed loop control, stability, step response, disturbance and control response are clearly demonstrated.

The particular feature of this experimental unit is that no real controlled systems are used; the controlled system is simulated on a PC by a simulation program developed by GUNT. This principle is in widespread application in product development in industry and is known as Hardware in Loop (HIL). All major types of controlled systems can be selected in the program. The controlled system parameters can be set within broad limits so that - unlike actual controlled systems - extreme parameter situations can be investigated. The time response can be recorded and analysed using the software. The controller and the PC are connected by a data acquisition card with AD and DA converters.

The controller that is used can be easily configured from the PC across an interface using the software provided.

The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments

- learning basic terminology and methods involved in process control
  * control loop comprising controller and controlled system
  * difference between open and closed loop control
- adapting the controller to different controlled systems
  * determining the controlled system parameters
  * choosing optimum controller parameters
  * using commonly applied tuning rules
  * investigating control and disturbance response
  * investigating the stability of the closed control loop


[1] experimental unit for controller tuning
[2] digital controller, configurable as a P, PI or PID controller with interface
[3] interface for PC
[4] data acquisition card for PC
[5] GUNT simulation software for different controlled system types, such as first and second order lags, time-delayed systems etc.
[6] recording and evaluation of time response on PC
[7] configuration software for process controller under Windows Vista or Windows 7

Technical Data

- configurable as P, PI or PID controller
- proportional gain Xp: 0...999,9%
- integral action time Tn: 0...3600s
- derivative time Tv: 0...1200s
Process variables as analogue signals: 0...10V
Controlled system simulation models with proportional, integral, first-order lag, second-order lag

Time-delayed response, non-linearity and limitation possible

Dimensions and Weight
LxWxH: 370x330x150mm
Weight: approx. 5kg Required for Operation 230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase

Scope of Delivery

1 experimental unit
1 data acquisition card
1 software CD with GUNT simulation software for controlled system models and configuration software for the controller
1 set of cables to connect the practice unit to the PC
1 set of instructional material

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