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Million with the oscillograph in the analysis of measurement converter - HC net electrical industry

By: betty

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Outline Smart transducer as a device for its multi-speed, high reliability and high number Energy And extensive control for various motors, such as Metallurgy , Paper, electronics assembly lines. Among the inverter in the event of failure of production; particular board-level failures occur, the experience alone is sometimes difficult to make the correct decision this time is necessary with high-performance Test Apparatus Fault analysis. Fluke19 2B Portable wildcard Oscilloscopes Set the oscilloscope, multimeter, paperless recorder in one, and with 60MHz bandwidth, the modern power electronic devices and maintenance of an ideal test Care Workers With.

General Converter works   Universal AC frequency inverter with rectifier into DC, then DC into a frequency counter, voltage is continuously adjustable three-phase AC, which AC - DC - AC mode. The so-called "universal" Package His mouth two meanings: First, can and General Induction Electric motor Supporting the use of; two is a wide choice of features for a variety of different types of loads. Figure 1 Plot of a typical digital control universal converter - induction motor drive system schematic.

Induction motor drive system diagram Modern PWM PWM inverter control circuit is microprocessor core, most digital circuits, and its main function is to accept all kinds of setting information and instructions, and then form the basis of their requirements drive inverter work PWM signal (see Figure 2).

  Figure 2 PWM inverter pulse generator
Measurement of the inverter waveform analysis
Million can be used with the oscillograph Detection of inverter Inverter (UI) part of the PWM gate drive signal, and output voltage waveform. The following companies in Finland VACON CX series inverter as a reference.

1) First of all, the gate will be dedicated adapter (GS1) connected to the oscilloscope input channel. Then the three gate GS1 joint (X9, X11, X13) connected to the power of board corresponding to the gate slot.

2) DC power to the DUT board and control panel power supply, connect the oscilloscope to test point, through Flukeview4.2 surveillance software observed U, V, W phase of the SPWM wave. When the DC power supply line voltage rating when, IGBT thyristor three-phase half-bridge gate up and down to-12V voltage should be about, so IGBT end, Figure 3.

Figure 3 IGBT gate waveform 3) and then run in 0Hz, observe every phase of the upper and lower half-bridge SPWM wave modulation frequency is normal (for a different power board this frequency difference, the board appears as 733.7Hz), Figure 4.

Figure 4, the frequency modulation waveform
4) 400V AC power to regulate a given frequency of 50Hz, the output PWM voltage waveform observed, Figure 5. Waveform can be seen from the relatively small output ripple is relatively stable.

Figure 5 PWM output voltage waveform
5) Finally, Flukeview4.2 macro templates provided by automatic generation of test reports a valuable test analysis.

Conclusion Waveform above all unique in the Fluke 'that touch the test' to test the auto-trigger mode, convenient and quick. Also available on the oscilloscope, multimeter diode rectifier bridge inverter and IGBT inverter bridge for accurate voltage measurement, limited space will not go.

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