Delta-B series inverter inverter output module is damaged and the drive circuit is seriously damaged: the drive integrated circuit T250V or burst, or the output terminal is short-circuited with the power supply ground, the filter capacitor is sprayed, the voltage regulator tube is broken down or open-circuited, the resistance is open or the resistance value is increased, and the circuit board is carbonized and damaged. It is found that the signal introduction resistor on the input side of the driving integrated circuit also shows several open circuit conditions, and the other end of this resistor is connected to the CPU trigger pulse output terminal, and the CPU has also suffered a strong electrical shock, if the CPU control board is damaged, the inverter does not have much repair value
1. After drawing the main circuit and the driving circuit, conduct a comprehensive inspection, scrape the carbonized part of the circuit board with a knife, and remove all the damaged components. There is no short circuit in the main circuit of the measurement, and the power transmission is checked, and the display is normal, which clarifies that the switching power supply and control part are basically normal. Six drive inputs (trigger signals from the CPU) are measured with an oscilloscope, and there is a trigger waveform with a peak value of 1.5V (0.6V measured by a multimeter) and a carrier wave of 10kHz that changes accordingly with the pulse width of frequency adjustment. Except for the inverter and the drive circuit are partially damaged, the other circuits are normal. Start buying parts now and get ready for a full correction.
2. Replace all the damaged parts of the drive circuit (more than 30 components), and detect the DC static voltage of each pin of the drive integrated circuit when energized, which is normal; Use an oscilloscope to measure the output waveform of each integrated circuit within the normal range, and then solder the inverter output module.
3. Power on to check, use the multimeter to communicate the file measurement and find that there is a three-phase imbalance, change to DC 500V file measurement, there is no DC component between V and W, but there is DC voltage between U, V and U, W! Regardless of frequency and voltage bumps, there should be no DC component. Experiment with three star-connected bulbs attached to the output to observe that the flickering phenomenon is too significant. According to experience, when the general frequency is adjusted above 20 Hz, no significant flicker should be felt, and gradually noticeable below 15 Hz; When I turn it up to about 30 Hz, there is still flickering. Combined with the above detection, one of the two positive and negative half-wave voltages output by the U phase is non-output!
4. Stop the power and check and find that the EU circuit triggers the voltage regulator diode DD11 in the power supply, because after the original SMD component is damaged, the lap welding is not robust after replacing the general component, and it is accidentally desoldered when installing the inverter module, resulting in the trigger end of the upper tube in the U phase has always been forced to be low level - negative pressure, and the upper tube has always been in the cut-off, that is, the phase only has the negative half-wave output of the lower tube conduction, so the DC component is produced in the output! The DD11 is repaired and welded, the three-phase output balance is measured, the DC component is zero, and it is connected to a 5.5kW submersible electric pump experiment, and the start and operation are normal, and the inverter is successfully corrected. If the three bulbs are connected and energized, the output frequency is adjusted to a few hertz first, and then the control terminal DCM and FWD terminal (forward rotation start control) are instantaneously short-circuited, and the inverter output module will be blown and damaged if you hear a "pop" MG25Q6ES42 sound in your ear!
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