This lab course utilises training panels in panel frames. The power supply for the frequency converter is provided by an inverter directly from the mains network (mains voltage 230 V).
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Protective measures and electrical safety
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Components of a frequency converter with variable voltage link
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Setting parameters for frequency converters
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Gaining skill in measurement techniques
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Measurements with Converter Controller CASSY
This equipment set offers an insight into the circuitry of frequency converters with variable voltage link. Measurements are made on the components of a frequency converter especially designed for educational purposes. The experiments use a static electronic load, which facilitates the evaluation of current and voltage curves. A rotating field with variable frequency is also investigated. The following components can be accessed:
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DC link
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IGBT H-bridge
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Brake chopper
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3-phase inverter
Highlights:
- The measurements are carried out with the Converter Controller CASSY.
- All measuring channels are potential-free and can therefore be used freely.
- All measurements can be carried out with or without a computer.
All functions of the Converter Controller CASSY can be operated quickly and directly via the display, the rotary wheel and the buttons on the unit. All settings and measurement results can be saved on the unit and quickly called up again later or simply downloaded.
In addition, the Converter Controller CASSY is fully controllable in real time via RJ45 Ethernet, W-LAN and USB-C interfaces.
These interfaces can be used by the following software:
- CASSY Lab 2 for drives and energy systems,
- MATLAB® and LabVIEW ™
- Lab Docs Editor Advanced
Several integrated servers are available in Converter Controller CASSY for the local media connection of at least four end devices simultaneously.
For more details, see product data 7735290 or 7735291 Converter Controller CASSY.
The equipment is equally suitable for pupil and student experiments in the laboratory with low voltage (DC, AC and three-phase current) and - with a mobile trainer - for teacher demonstrations in the classroom or lecture hall. The experiments are carried out according to the manual.
The target group is made up of commercial apprentices and students of electrical machine construction. The course offers experiments at an intermediate level and also allows for the necessary insight into machine behaviour for scientific interpretation at undergraduate level. The media connection makes the experiments suitable for demonstration in the classroom or a lecture hall.
In the following configurations there are further extended experiments with a frequency converter and an asynchronous machine:
- E2.5.3.3 Drives with educational frequency converter
- E2.5.3.4 Drives with industrial frequency converter
- E2.5.4.4 Operating behaviour of speed-variable asynchronous motors under load
- E2.6.2.2 AC servo with industrial asynchronous machine
Topics
- Rotating field and space vectors
- Space vector representation
- Generation of a rotating field from a DC voltage
- Switching on a converter with rectifier supply
- Mains feedback with rectifier supply
- Power factor correction filter (PFC)
- Switching on a converter with PFC
- Mains feedback with PFC
- Control characteristic
- Loading
- Control via external control voltage
- Investigation of output inverter
- Control of individual power transistors
- Loading with resistive load
