Digital Closed Loop Control

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.

Educational objectives

• Get familiar with the basic principles of controllers
• Setpoint and disturbance control
• Handle analysis and simulation software

Function
Unlike hardware-based electronic controllers, digital controllers can be customised for the respective process simply by making modifications in the software. In this set, the special problems and opportunities associated with sampling control are investigated. The electronic PID digital controller as well as the CASSY Lab 2-based interface controller and WinFACT are used as controllers. Electronic controlled systems - some cascaded - facilitate the investigation of processes with defined, high order.

The equipment set incorporates student experiments which can be carried out in a laboratory safely using safety extra-low voltage. Experiment instructions are contained in a manual in either printed or digital form.

Target Groups
Students completing vocational training in electrical engineering for the 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 6.3.4.3 Fuzzy control

Topics

• Analysis of step responses
• Determining parameters with the adjustment function
• Empirical controller conceptualisation.
• Control unit design through pole-zero compensation
• Control unit design through numerical optimisation
• Controller design using the rule of thumb method
• Identification of a PT2 system
• Time behaviour of the PID component
• Signal sequence on the sample hold component
• Digital PID controller with sample & hold
• Controlling the PT4 system with sampling controller
• Digital controller with WinFACT
• Digital controller with CASSY Lab
• Controlling a PT2 system with real-time simulation
• Identification of a PT4 system
• CHR-optimised control of a PT4 system
• Controlled system at the stability limit
• ZN-optimised control of a PT4 system
• Controlling a PT2 system with two-point controller
• Two-point controller with delayed feedback
• Two-point controller with delayed weakening feedback
• Controlling a PT4 system with three-point controller