1. Static test
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 there are the following results, it can be judged that the circuit has been abnormal, A. the resistance value of the three-phase is unbalanced, indicating 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 or the starting resistance can be judged to be faulty.
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. The N-end of the black watch rod and repeat the above process should get the same result, otherwise it can be admitted that there is a problem with the inverter module.
2. Dynamic test
After the test results are normal, the dynamic test can be carried out, that is, the power-on test machine. It is necessary to pay attention to the following points before and after powering on:
1. Before powering on, you must admit that 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 in the inverter, and the explosion machine will be out when it is severe.
3. After powering on, detect the content of the fault, and start to determine the fault and the 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 something wrong with the module or driver board.
5. In the case of normal output voltage (no phase loss, three-phase balance), load test, try to be full load test.
3. Fault identification
1. The rectifier module is damaged
It is usually caused by grid voltage or internal short circuit. In the case of exclusion of internal short circuits, the rectifier bridge is replaced. When dealing with faults on site, it is important to check the user's power grid situation, such as grid voltage, whether there is equipment that pollutes the power grid such as welding machines, etc.
2. The inverter module is damaged
It is usually caused by damage to the motor or cable and a fault in the drive circuit. After correcting the drive circuit, replace the module when the driving waveform is in good condition. After replacing the driver board in field service, look at the motor and connection cables. Only when it is admitted that there is nothing wrong with it can the inverter be run.
3. There is no manifestation when the power is on
Generally, it is caused by the damage of the switching power supply or the damage of the soft charging circuit so that the DC circuit has no direct current, such as the damage of the starting resistor, and the damage of the operation panel.
4. Overvoltage or undervoltage is displayed
It is generally caused by the lack of phase of the input, the aging of the circuit and the dampness of the circuit board. The solution is to find its voltage detection circuit and detection point, and replace the damaged device.
5. Overcurrent or short circuit to ground
It is usually due to damage to the current detection circuit. Such as Hall elements, op amp circuits, etc.
6. The power supply and the driver board start to show overcurrent
It is usually caused by damage to the drive circuit or inverter module.
7. The no-load output voltage is normal, and overload or overcurrent appears after loading
Generally, it is caused by improper parameter setting or aging of the driving circuit and damage to the module.
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