In the process of inverter protection and maintenance, various problems are often encountered, such as field line problems, poor primary parameter settings or mechanical equipment shortcomings. If there is a defect in the inverter, how to distinguish which part of the problem is a little more detailed here.
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 from U, V, and W, and there should be a resistance value of tens of ohms, and the resistance value base of each phase should be the same, and the opposite should be immeasurable. The black watch rod is received to the n end, 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 from R, S, T, which should have a resistance value of about tens of ohms, 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 the infinite amount. Receiving the red watch rod to the n-end and repeating the above process should achieve the same result. If there are the following effects, it can be judged that the power supply circuit has been abnormal, a. the resistance value is unbalanced, and the shortcomings of the rectifier tube can be marked. b. When the red watch rod is connected to the P terminal, the resistor is immeasurable, and the defects of the rectifier tube or the defects of the starting resistor can be distinguished.
How to distinguish where the inverter is wrong?
Step 2: Dynamic inspection
Only when the static data check is normal can the dynamic check be carried out, that is, the power on commissioning. It is necessary to pay attention to the following aspects before and after 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 at times, and it is very likely that the inverter will have shortcomings, and there will be a situation such as blowing pipes when it is not optimistic.
3. After powering on, check the shortcomings and flash the content, and begin 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, start the inverter under the condition of full load (not connected to the motor), and detect the three-phase output voltage value of U, V and W. 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.
How to distinguish where the inverter is wrong?
Step 3: Problem Differentiation
1. The rectifier module is damaged
Generally, it is formed by the power grid operating voltage or internal short circuit. In the case of cleaning 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. After adjusting the optocoupler circuit, the control module is replaced when the waveform of the driver 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 reaction circuit has no DC power supply, such as the engine resistor is damaged, or it may be 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, overcurrent or short circuit of grounding device flashes
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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