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Processing Steps:
(1) First, check if the compressor wiring is loose or reversed.
(2) Inspect the appearance of the controller, focusing on the six PWM outputs of the chip and checking for solder shorts at the pins of the IPM module.
(3) With the power off, use a multimeter to measure if there is a short circuit across the six bridge arms of the compressor (measure the positive terminal P of Vdc against U, V, W, and the negative terminal of Vdc against U, V, W).
(4) Use a multimeter to check if there is a signal output from the six PWM outputs of the main chip (measure the voltage at R11 to R16 near the IPM side pins; if the voltage is changing, it indicates a PWM signal). If possible, it is best to use an oscilloscope to test the waveform of the PWM signal.
(5) If the PWM signal is normal, measure whether the 15V power supply voltage to the IPM module is normal.
(6) If the 15V power supply is normal, use a multimeter to measure the resistance values of the surface mount resistors R621 and R622. Since the resistance values may vary by model, measurements should be taken according to the specified resistance values.
(7) Use a multimeter to check if the resistance values of the compressor’s three-phase current sampling resistors RS302, RS303, and RS304 are consistent (since these resistors are only 15 milliohms, precise measurement is not possible; you can only determine if the resistance values are consistent). Also, check the silk screen on these three resistors to see if there are any incorrect resistor installations.
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