How to distinguish where the inverter is wrong?
Step 1: Static data checking
1. Check the inverter circuit
The red watch rod is received to the P terminal, and the black watch rod is separated and connected to U, V, and W, there should be a resistance value of tens of ohms, and the resistance value base of each phase, the same, should be infinite on the contrary. The black watch rod is received to the n-terminus, and the above process should be repeated to achieve the same effect, otherwise the shortcomings of the inverter power control module can be identified
2. Check the rectifier circuit
Find the P and N ends of the DC regulated power supply inside the inverter, adjust the digital multimeter to the resistor X10 gear, the red watch rod receives P, and the black watch rod is separated according to R, S, T, There should be about tens of ohms of resistance value, and the skill base is balanced. In turn, the black watch rod receives the p-terminus, and the red watch rod receives r, s, and t in turn, with a resistance value close to infinity. Receiving the red watch rod to the n-end and repeating the above process should achieve the same effect. If there are the following effects, it can be judged that the power supply circuit has been abnormal, a. the resistance value of the three-phase is unbalanced, which can indicate the shortcomings of the rectifier tube. b. When the red watch rod is connected to the P terminal, the resistors are infinite, and the defects of the rectifier tube or the defects of the starting resistor can be distinguished.
Step 2: Dynamic inspection
In the future, when the static data verification effect is normal, the dynamic inspection can be carried out, that is, the power on commissioning. The following aspects must be paid attention to before and after the power on:
1. Once the power is on, it is necessary to recognize whether the input operating voltage is incorrect, and there will be a frying tube (fried capacitor, zinc oxide varistor, control module, etc.) in the 380V switching power supply connected to the 220V inverter.
2. Check whether the inverter's broadcast ports have been properly docked, whether the docking is loose, and the docking is abnormal, and sometimes it is very likely that the inverter will have shortcomings, and there will be a situation such as blowing up pipes when it is not optimistic.
3. Check the shortcomings and flash the contents after power-on, and start to identify the shortcomings and causes.
4. If there is no shortcoming, the first thing to check is whether the primary parameter is abnormal, and after the primary parameter is returned, the inverter is started under full load (not connected to the motor), and the output voltage value of U, V and W is detected. If there is a phase failure, three-phase unbalance, etc., the control module or drive board has shortcomings
5. Under the condition that the output voltage is normal (falling feather phase, three-phase balance), the load is checked. When inspecting, it is best to inspect at full capacity.
Step 3: Problem Differentiation
1. The rectifier module is damaged
Generally, it is formed because of the defects of power grid operating voltage or internal short circuit. In the case of cleaning the defect of the internal short circuit, replace the rectifier tube. When dealing with shortcomings on site, it is important to inquire about the status of the customer's power grid, such as the operating voltage of the power grid, whether there are machines and equipment that have environmental pollution to the power grid such as DC welding machines, etc.
2. The inverter power control module is damaged
Generally, it is due to damage to the motor or cable and the defect of the optocoupler circuit. In the future, the optocoupler circuit is adjusted, and the control module is replaced when the driver waveform is excellent. In the future, it is necessary to check the motor and connection cables when replacing the driver board in field service. In the judgment of no shortcomings, the operation of the inverter.
3. There is no flash when the power is on
Generally, it is because the power transformer is damaged or the soft battery charging power supply circuit is damaged, so that the feedback circuit has no DC power supply, such as the engine resistor is damaged, or it may be that the control panel is damaged.
4. Overvoltage or under-operation voltage flashes after power-on
Generally, due to the phase failure of the keying, the embrittlement of the power circuit and the re-moisture of the circuit board are formed. Find its operating voltage, check the power supply circuit and detection point, and replace the damaged instrument.
5. After power-on, there is a shortcoming of overcurrent or short circuit of the grounding device
Generally, the power supply circuit is damaged because of the current level. Such as Hall sensors, operational amplifiers, etc.
6. Start the flash overcurrent amount
Generally, it is caused by damage to the optocoupler circuit or the inverter power control module.
7. The output voltage of full load is normal, and the load or overcurrent amount flashes after the load
This situation is generally caused by the impropriety of the basic parameters or the embrittlement of the optocoupler circuit, and the damage of the control module.
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