In this equipment, the operation and operating behaviour of an industrial frequency converter on an asynchronous machine with squirrel-cage rotor is investigated.
The power electronics part of this lab course uses training panels. The electrical machine employed is an industrial machine on a base, whereby its characteristics are determined using the machine test system 0.3. Power is supplied to the machine under test via an industrial frequency converter, which obtains its power from the mains network (mains voltage, 230 V).
Objectives
- Protective measures and electrical safety,
- Installation of power engineering systems according to circuit diagram
- Commissioning of electric drives
- Recording of load characteristics with various operating parameters
- Acquisition of measurement expertise on electrical machines
- Open loop speed control of an asynchronous machine
- Measurements are carried out with the Machine Test CASSY.
Industrial frequency converters are used to optimise machines in automation processes. The equipment includes an industrial, compact frequency converter. The focus of the experiments is on commissioning and parametrising the converter and investigating the machine behaviour.
The manufacturer's software is used for parametrisation; programming by hand is possible but not didactically useful given the large number of parameters.
Highlights
- The measurements are carried out with the Machine Test CASSY.
- All measuring channels are potential-free and can therefore be used freely.
- All measurements can be carried out with or without a computer.
- To protect against overheating, the stator windings of the asynchronous motor are equipped with temperature detectors.
- The asynchronous motor has a didactic terminal board with the winding diagram printed on it.
- This document contains a table of contents and thus defines a course, between whose chapters you can navigate freely.
- Each entry in the table of contents is a chapter of the course. The order of the chapters is determined by the table of contents. The first chapter is always the table of contents itself.
Measuring and media system
Machine Test CASSY 0.3
The machine test CASSY 0.3 can be quickly operated in all functions directly via the display, the rotary knob and the buttons on the device. All settings and measurement results can be saved on the device and quickly called up again later or simply downloaded.
For more details, see product data 7731901 Machine Test CASSY 0.3.
In addition, the Machine Test CASSY 0.3 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.
The following integrated servers are available in the Machine Test CASSY 0.3 for the local media connection of at least four end devices simultaneously.
Target group
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:
- E2.5.3.2 Basics of frequency converter technology
- E2.5.3.3 Drives with educational 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
