1. Before the inverter is energized
The temperature and humidity of the surrounding environment should be detected first. Too high a temperature will cause the inverter to overheat the alarm. When severe, it will directly lead to damage to the power supply device of the inverter and short circuit of the circuit; Excessive humidity of the air can lead to a direct short circuit inside the inverter. When the inverter is running, pay attention to whether the cooling system is in production, such as whether the exhaust of the air duct is smooth, whether the fan has abnormal noise, etc. Under normal circumstances, the inverter with a high protection level, such as the inverter above IP20, can directly open the device, and the inverter below IP20 should be installed in the cabinet, so the heat dissipation effect of the inverter cabinet will directly affect the normal operation of the inverter, and the exhaust system of the inverter, such as fan rotation, dust and air inlet blockage, is a place that cannot be ignored in our daily viewing. Whether the motor, reactor and transformer are overheated and smelly; whether the inverter and motor have abnormal noise; Whether the current on the inverter panel is too large or whether the current change range is too large, and whether the output UVW three-phase voltage and current are balanced.
2. Regular maintenance
Dust removal regularly, check whether the air inlet of the fan is blocked, and clean the cooling air duct and internal dust of the air filter every month.
Check it regularly once a year: check whether the screws, bolts and plug-ins are loose, and whether the grounding and phase-to-phase resistance of the input and output reactors are short-circuited, which should be greater than tens of megaohms under normal circumstances. Check for corrosion of wires and insulators. If so, wipe it with alcohol promptly. Measure the stability of the output circuit voltage of the switching power supply, such as 5V, 12V, 15V, 24V, etc. Look for spark marks on the contactor contacts. Replace the new contactor of the same type or greater than the original capacity when it is severe; Acknowledging the correctness of the control voltage and conducting sequential maintenance action experiments; Acknowledging that maintenance shows that the circuit is working properly; Acknowledging that the output voltage is balanced when the inverter operates alone.
Carefully do a good job in the daily maintenance and overhaul of the inverter, including:
1. Dust the inverter regularly, focusing on the rectifier cabinet, inverter cabinet and control cabinet. If necessary, remove the rectifier module, inverter module and circuit board from the control cabinet for dust removal. Whether the downwind and upwind outlets of the inverter are blocked by dust or have too much dust. Because the heat dissipation of the inverter requires a large amount of ventilation, the surface dust is severe after a period of operation, so it is necessary to clean and remove dust regularly.
2. Open the front door of the inverter and disassemble the back door. Carefully check whether the AC and DC bus is deformed, corroded and oxidized, whether the screws at the bus connection are loose, whether the solid screws at the fixed points of each device are loose, and whether the insulating sheet or insulating column for fixing is aged, cracked or deformed. If so, replace and retighten in time. It is necessary to correct and re-install the deformed busbar.
3. After the circuit board and bus are dusted, the necessary anti-corrosion treatment should be carried out and the insulating paint should be coated. Busbars for partial discharge and arcing should be treated after deburring. With regard to the insulating board with insulation breakdown, it is necessary to remove the damaged part and isolate it in the vicinity of the damage with an insulating plate of the corresponding insulation class. The insulation layer is tightened and the test is qualified before it can be put into use.
4. Whether the operation and rotation of the fan in the rectifier cabinet and inverter cabinet are normal. When stopping, turn the bearing by hand and observe whether the bearing is stuck or noisy. Replace bearings and repair them if necessary.
5. Conduct a comprehensive inspection of the input, rectifier, inverter, and DC input fast melting, and replace the burning loss in time.
6. Whether the capacitor in the central DC circuit has liquid leakage, whether the shell has swelled, blistered or deformed, and whether the safety valve is damaged. If possible, capacitor capacitance, leakage current, and withstand voltage can be tested, and capacitors that do not meet the requirements can be replaced. New capacitors or capacitors that have not been used for a long time should be passivated.
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