1. When the motor current in the inverter is set too large, the motor protection parameter is set too large, and the inverter cannot protect the motor according to the actual current of the motor when the motor is overloaded, which will cause the motor to overload, heat, or burn.
2. When the motor speed is not set correctly, if the set speed exceeds the rated speed of the motor, the motor will run in the constant power area at a higher speed at the rated frequency point. The higher the speed, the smaller the output torque, which will cause the motor Excessive current overheats or burns the motor.
3. If the acceleration and deceleration time of the motor is too short, the inverter will report an overcurrent fault for protection.
4. The inverter adopts vector control, but the motor and the inverter do not have paired self-learning, which causes the parameters of the inverter to control the motor to be inconsistent with the actual value of the motor, causing the control accuracy to deteriorate, and the motor to heat or burn.
5. When the carrier frequency is set relatively high, the switching rate of the switch tube of the inverter is relatively high, and the heat generation increases. At this time, the ability of the inverter to resist the change of load current decreases. When the load current increases, the inverter may overheat. The flow trips, and the phenomenon reflected on the surface is that there is a problem with the motor.
6. The motor protection current is not set. Most of the default protection current of the inverter is 150% of the rated output current of the inverter. The inverter will protect only when the motor current reaches this value; and the output current of the inverter should be greater than the rated current of the motor. , When the current of the motor reaches the protection current of the inverter, the motor has been overloaded by far more than 150%, and the motor is seriously heated and burned.
The reasons for the burnout of the inverter have a lot to do with the production environment, mainly including the following:
1. Metal and other conductive dust, dust.
(1) Too much conductive dust such as metal causes the main circuit to be short-circuited.
(2) The temperature of the cooling fin is too high to cause tripping and burning.
2. Corrosive gases
(1) The toggle switch and the relay are in poor contact due to corrosive gas.
(2) Short circuit between crystals caused by corrosive gas
(3) Corrosion of terminals causes short circuit of main circuit.
(4) Corrosion of the circuit board causes a short circuit between the devices
3, condensation, moisture, damp.
(1) The door is discolored due to moisture, resulting in poor contact.
(2) Sparking phenomenon between the copper plates of the main circuit board due to moisture.
(3) Causes electrical corrosion and disconnection of the internal resistance of the inverter.
(4) There is condensation in the insulating paper, which causes the discharge breakdown phenomenon.
4. Inaccurate selection, parameters are not adjusted to the best use state
(1) If the model selection is not accurate, it will cause the inverter to be overloaded early, and the phenomenon of small horse-drawn carts.
(2) The parameters are not adjusted to the best use state, so that the inverter often trips over current, overvoltage, etc.
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