Digital Closed Loop Control

E6.3.4.2

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

1	734 02 8	Reference variable generator
1	734 064N 8	PID digital controller net
2	734 091	Digital Controlled System
1	734 41	Sample and Hold Element
1	524 016S2 8	Profi-CASSY Starter 2
1	726 09 4	Panel frame T130, two-level
1	726 86 4	Stabilised power supply unit ±15 V / 3 A
3	500 59 8	Safety bridging plugs, black, set of 10
1	500 592 8	Safety bridging plugs with tap, black, set of 10
1	775 700DE 4	LIT-print: Digital Control, German
3	500 641 8	Safety experiment cable, 100 cm, red
3	500 642 4	Safety experiment cable, 100 cm, blue
3	500 644 8	Safety experiment cable, 100 cm, black
1	734 501 4	WINFACT LD Starter (one computer)
1	734 502 4	WINFACT LD Starter (site license)
1	726 09 4	Panel frame T130, two-level
1	726 86 4	Stabilised power supply unit ±15 V / 3 A
3	500 59 8	Safety bridging plugs, black, set of 10
1	500 592 8	Safety bridging plugs with tap, black, set of 10
3	500 641 8	Safety experiment cable, 100 cm, red
1	726 10 4	* Panel frame T150, two-level
1	734 504	* WINFACT LD Edition (one computer)
1	734 505 4	* WINFACT LD Edition (Site Licence)
1	775 700EN 4	* LIT-print: Digital Control
1		additionally required: 1 PC with Windows 7 / 8.1 / 10 (x86 or x64)

Articles marked with * are not essential, we do however recommend them to carry out the experiment.

Digital Closed Loop Control

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