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This laboratory practical utilises training panels in panel frames. The power is supplied to the frequency converter directly from the mains (mains voltage, 230 V).


  • Protective measures and electrical safety
  • Components of a frequency converter with variable voltage link
  • Setting parameters for frequency converters
  • Gaining skill in measurement techniques

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:

  • Input bridge rectifier with link capacitor
  • Brake chopper
  • Power inverter

Students work in the power engineering lab with mains voltage. Experiments procedures are contained in a printed manual.

The experiments are designed for intermediate and advanced levels.


  • Rotating field and space vectors
  • Feeding a sinusoidal signal from the normal three-phase mains network
  • Representation of space vectors
  • Generation of a rotating field from a DC voltage
  • Putting a converter into operation
  • Fault-free activation of the mains voltage
  • Activation of the input rectifier
  • Switching off the converter
  • Discharging the buffer capacitor
  • Investigation of input rectifier
  • Response with zero-delay angle setting, Cl = 00
  • Control characteristic
  • Loading
  • Control via external control voltage
  • Investigation of output inverter
  • Control of individual power transistors
  • Generation of rotating field
  • Loading with resistive load

Similar to illustration

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735 09   Load power electronics 1
735 296 Converter input/output 1
501 02   BNC cable, 1 m 2
531 282  Multimeter Metrahit Pro 1
575 231   Probe 100 MHz, 1:1 / 10:1 2
575 230   Digital storage oscilloscope 722 1
735 261   Isolation amplifier, four channel 1
726 09   Panel frame T130, two-level 1
726 71   Single-phase supply unit 1
500 59   Safety bridging plugs, black, set of 10 1
500 851   Safety connecting leads, 32 A, set of 32 1
500 852   Safety connecting leads, 32 A, yellow/green, set of 10 1
565 431   LIT: Power Electronics and Drive Technology, T 12.4.3 (in German) 1
565 432   * LIT: Power Electronics and Drive Technology, T 12.4.3 (in English) 1

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




Firma produkuje zestawy edukacyjne do kształcenia akademickiego oraz szkolenia zawodowego z zakresu fizyki, chemii, biologii oraz elektroniki, elektrotechniki, automatyki, telekomunikacji, maszyn elektrycznych, odnawialnych źródeł energii i fotoniki, jest częścią grupy LD Didactic.