Digital Control

System

The experiments are set up with experimental panels in the profile frame. The controlled system or control loop is controlled with the Profi-CASSY and the measured values of interest are recorded.

Learning objectives

• Recognising basic control principles
• Management and fault control
• Handling Analysis and Simulation Software

Function

In contrast to hardware-based electronic controllers, digital controllers can be customised to the respective process simply by changing the software. In this configuration, the special problems and possibilities of sampling controllers are analysed. The electronic PID digital controller and interface controllers based on CASSY Lab 2 and WinFACT are used as controllers. Electronic controlled systems - partly cascaded - allow the investigation of processes with a defined, higher order.

Method

The equipment includes student experiments in the laboratory with non-hazardous low voltage. Experimental procedures are carried out using a manual in printed or electronic form.

Target groups

Vocational training in electrical engineering in trade and industry and students specialising in automation technology and mechatronics. The course offers both introductory courses at a basic level as well as challenging topics for bachelor's programmes.

Additions

The following equipment is recommended for in-depth study:

• E6.3.4.1 Control of electronic routes
• E6.3.4.3 Fuzzy control

Themes

• Analysis of step responses
• Parameter determination with the fitting function
• Empirical controller design
• Controller design through pole-zero compensation
• Controller design through numerical optimisation
• Controller design with rule-of-thumb method
• Identification of a PT2 route
• Time behaviour of the PID element
• Signal curve at the sample-hold element
• Digital PID controller with sample & hold
• Control of a PT4 line with sampling controller
• Digital controller with WinFACT
• Digital controller with CASSY Lab
• Control of a PT2 line with real-time simulation
• Identification of a PT4 route
• CHR-optimised control of a PT4 line
• Controlled system at the stability limit
• ZN-optimised control of a PT4 line
• Control of a PT2 line with two-point controller
• Two-point controller with delayed feedback
• Two-point controller with delayed feedback
• Control of a PT4 line with three-point controller