Common fault solutions for INVT inverters
1. Power-on tripping or sparks appear in the terminal part of the main power supply of the inverter.
Solution: Disconnect the power cord, repair the inverter to check whether the input terminal is short-circuited, check whether the DC side terminal p,n of the central circuit of the inverter is short-circuited, perhaps the reason is that the rectifier is damaged or the central circuit is short-circuited.
Second, there is no output when the inverter is turned on (the motor is not started).
Solution: Disconnect the output motor cable, observe the input frequency flashed on the inverter panel after turning on the machine again, and measure the AC output terminal together. Perhaps the reason is that the inverter initiates the parameter setting or the wiring of the job terminal, or it may be that the inverter is partially damaged or the motor is not properly connected to the inverter.
3. No flashing when powered on.
Solution: Disconnect the power cord, check whether the power supply is out of phase or short circuit, assuming that the power supply is normal, check whether there is voltage on the DC side terminal p,n of the frequency conversion center circuit after powering on again, false.
If the above inspection is normal, it is judged that the internal switching power supply of the inverter is damaged.
Fourth, the position of the inverter device is unreasonable, and the planning of the inverter cabinet is unreasonable.
Solution: The primary inverter cabinet is too narrow inside, the heat dissipation and ventilation effect is poor, resulting in poor heat dissipation, the electronic equipment in the operation due to static electricity and thermal expansion and contraction, adsorption of a large amount of dust, seriously affecting the normal operation of the inverter, and even the formation of shutdown shortcomings, the inverter cabinet heat dissipation diversion AC fan is attributed to the wearing parts, the service life is generally about 2 years, this situation is more common in the inverter repair, especially in summer, due to the inverter cabinet device in the indoor surrounding environment temperature is higher in the place, once the ventilation and heat dissipation system is not smooth, it will cause the inverter to overheat and shut down the alarm frequently。
Fifth, the shortcomings of the inverter control circuit.
Solution: The main control circuit board, switching power supply board, power converter, filter capacitor and other control circuit shortcomings, the main shortcomings are +5V, +12V DC switching power supply circuit burnout, rectifier bridge filter capacitor breakdown, central DC circuit shortcomings, IGBT power converter burned out due to overheating, control circuit board output relay burned out, driving circuit shortcomings, charge and discharge circuit shortcomings, etc.
6. Disadvantages of large-capacity filter capacitors.
Solution: In general, the inverter that operates continuously for a long time should be replaced and protected with a large-capacity filter capacitor in 2-5 years, otherwise the capacitance defects will simply appear, and the capacitance shortcomings will mainly be due to the phenomenon of leakage and bulging caused by breakdown, which cannot meet the operation requirements of slippery DC.
Seven: Disadvantages phenomenon:
Solution: Most of the shortcomings are characterized by no flashing of the operation panel or failure of the operation key, and the shortcomings of the field inverter are mainly caused by the short circuit of the connection line between the operation panel and the host, the loosening of the joint of the operation panel, the aging of the operation key and the locking of the operation key.
8. The shortcomings of the peripheral control circuit devices of the inverter.
Solution: The inverter itself has no shortcomings, but the external control circuit produces shortcomings, the main performance is AC contactor, various relays, air switches, PLC, harmonic suppressors, frequency conversion cabinet heat dissipation AC fans, fuse wires, on-site flash instruments and alarm circuit devices and other shortcomings of control circuit devices.
9. The power mismatch causes the shortcomings of the inverter caused by the problem of small horse-drawn carts.
Solution: Due to the requirements of the production process conditions when the inverter energy-saving transformation is put into operation, the inverter operates at low power, considering the investment capital, the power of the inverter was selected at that time to be less than the rated power of the motor, but with the change of the production operation parameters, it is necessary to operate at a higher frequency, and there is a problem of small horse-drawn carts, which eventually leads to the inverter to operate under overload for a long time, and produces the shortcomings of the main control circuit, and can not operate normally, so the selection of the motor should be strictly based on the parameter selection, and when repairing and replacing the motor, not only focus on the parameters but also debug and match the inverter from the beginning。