1. Test rectifier circuit:
To the P end and N end of the DC power supply inside the inverter, adjust the multimeter to the resistance X10 gear, the red watch rod is connected to P, and the black watch rod is separated from R, S, T, and there are tens of ohms of resistance in normal times, and it is basically balanced. On the contrary, the black watch rod is connected to the P terminal, and the red watch rod is connected to R, S, and T in turn, and there is a resistance value close to infinity.
Connect the red watch stick to the N-end and repeat the above steps, and you should get the same result. If there is a three-phase imbalance with the resistance value, it is clear that there is a problem with the rectifier bridge. When the red watch rod is connected to the P terminal, the resistance is infinite, which can determine the problem of the rectifier bridge or the starting resistance.
2. Test the inverter circuit:
Connect the red watch rod to the P terminal, and the black watch rod should be connected to U, V, and W, and there should be tens of ohms of resistance, and the resistance value of each phase is basically the same. The N-end of the black watch rod, the inversion should be infinity, repeat the above steps should get the same result, otherwise it can be determined that there is a problem with the inverter module.
3. Dynamic test: After the static test results are normal, the dynamic test can be carried out, that is, the power-on test machine. The following points must be paid attention to before and after power-on:
(1) Before powering on, it is necessary to confirm whether the input voltage is incorrect, and the 380V power supply will be connected to the 220V inverter, and the explosion machine (fried capacitors, varistors, modules, etc.) will appear.
(2) Check whether the connectors of the inverter have been correctly connected, whether the connection is loose, abnormal connection may sometimes lead to problems with the inverter, and the explosion machine will be out when it is severe.
(3) After powering on, detect the content of the problem, and preliminarily determine the problem and its cause.
(4) If there is no problem, first check whether the parameters are abnormal, and after the parameters are restored, start the inverter under the condition of no load (not connected to the motor), and test the output voltage value of U, V and W. If there is a lack of phase, three-phase unbalance, etc., there is a problem with the module or driver board.
(5) Under the condition that the output voltage is normal (no phase loss, three-phase balance), the load test should be full load test as much as possible.
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