Static quizzes
1. Test the rectifier circuit
Find the P and N ends of the DC power supply inside the inverter, adjust the multimeter to the resistance X10 gear, connect the red watch rod to P, and separate the black watch rod to R, S, T. 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 rod to the N-end and repeat the above process, and you should get the same result. If the following results are available, it can be determined that the circuit has been abnormal, A. The resistance value of the three-phase is unbalanced, and it is clear that there is a problem with the rectifier bridge. B. When the red watch rod is connected to the P terminal, the resistance is infinite, and the rectifier bridge problem or activation can be determined.
2. Test the inverter circuit
Connect the red watch rod to the P terminal, and the black watch rod separate from the U, V, and W, there should be a resistance value of tens of ohms, and the resistance value of each phase is fundamentally the same, and the reverse phase should be infinity. Repeat the above process to the N end of the black watch rod to get the same result, otherwise it can be confirmed that there is a problem with the inverter module.
Dynamic quizzes
After the test results are normal, the dynamic test can be carried out, that is, the power-on test machine. Before and after powering on, you must pay attention to the following points:
1. Before powering on, you must confirm whether the input voltage is wrong, and the 380V power supply will be fried (fried capacitors, varistors, modules, etc.) when connected to the 220V inverter.
2. Check whether the inverter's broadcast ports 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 a full load test as much as possible.
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Daily View Item 1:
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