Brightness Control

E6.3.1.4

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
Light control systems contain light sources for usable and disturbance light as well as a photo sensor. The LED light sources are activated directly with the controller. An external control element (power amplifier) is not necessary. The diffusing screen spatially influences the controlled system as an external disturbance variable. Influenced by the relatively high limit frequencies of the opto semiconductors, the light control system has a time response similar to a fast PT1 system. The resulting system order is n = 1; there is only one main energy store. Light control is required for rooms where light is critical to safety, such as in sports arenas or hospitals. One biological example would be the ability of the eye to adapt to different levels of brightness (pupils).

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.

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

Similar figure

1	734 02 8	Reference variable generator
1	734 064N 8	PID digital controller net
1	734 311	Light controlled system
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
1	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	775 683DE 4	LIT-print: Brightness Control, German
1	775 683EN 4	LIT-print: Brightness Control
1	775 683FR 4	LIT-print: Brightness Control, French
1	734 501 4	WINFACT LD Starter (one computer)
1	500 642 4	Safety experiment cable, 100 cm, blue
1	500 644 8	Safety experiment cable, 100 cm, black
1	726 10 4	* Panel frame T150, two-level
1	734 502 4	* WINFACT LD Starter (site license)
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.

Brightness Control

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