System
The experiments are set up with experiment plates in profile frames. The controlled system or control circuit are activated with the Profi-CASSY and the relevant measurement values recorded.
Objectives
- Get familiar with the basic principles of controllers
- Setpoint and disturbance control
- Handle analysis and simulation software
Function
Controlling the temperature of residential buildings, vehicles, or workpieces is a classic example of systems with large time constants. The temperature controlled system works with two-point controllers as well as with PID and software controllers. It has a 7-segment display for the current temperature. A halogen lamp serves as the heat source and also ensures visibility of the heating process. The temperature is measured with an NTC thermistor. A ventilator and closable cap are available in the heater duct for investigation of the disturbance behaviour. Two integrated power amplifiers (for heating and cooling) facilitate direct activation with the controller, control elements are not necessary. The temperature controlled system can also be operated with fuzzy controlling.
Method
The equipment is ideal for demonstration and students' experiments. The tests were carried out with an electronic manual and the data files for CASSY Lab 2 and WinFACT. It is true Plug & Play: The measurement starts automatically after loading the data file.
Target groups
Students completing vocational training in electrical engineering for industry and students of automation engineering and mechatronics are the target group. The course offers introductory experiments that are very simple and also addresses difficult topics for bachelor-level studies.
Add-ons
The following sets are recommended for further learning:
E 6.3.4.1 Controlling Electronic Systems
E 6.3.4.2 Digital Controlling
E 6.3.4.3 Fuzzy Controlling
Topics
- Characteristic curve for the temperature controlling system
- Recording the jump response
- Optimal amount, replacement controlled system
- Technical controller
- Controller in the limit range
- Empirical tuning of controllers
- Control unit design with known time constants for the controlled system
- Controller design zero-pole compensation, KP determination in batch run
- Control unit design through numerical optimization
- Rule of thumb method
- Setpoint and disturbance control with electronic controllers
- Temperature regulation with a software controller
- Temperature controlling with block-oriented PC simulation
- Temperature control with two-point controller, influence of hysteresis
- Two-point controller with delayed feedback
- Two-point controller with delayed weakening feedback
- Temperature regulation with three-point controller
- Control circuit modelling
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