There are three types of fault signals for the inverter:
(1) Excessive mechanical load: The primary feature of excessive load is that the motor heats up, and the operating current can be read from the display screen to find. The primary reason is that the load of the inverter is too large, and the acceleration and deceleration time and operation cycle time are too short; The voltage of the V/F characteristic is too high; The power of the inverter is too small.
(2) Three-phase voltage imbalance: the operating current of a certain phase is too large, resulting in overload tripping, which is characterized by unbalanced heating of the motor, which may not be found when reading the running current from the display screen (because the display screen only shows one phase current).
(3) Malfunction: The current detection part inside the inverter has a fault, and the detected current signal is too large, resulting in tripping.
The fault signal processing method of the inverter is as follows:
(1) Check whether the motor is hot.
If the temperature rise of the motor is not high, first of all, you should check the size of the load, acceleration and deceleration time, and whether the setting of the operating cycle time is reasonable, and correct the V/F characteristics, and check whether the electronic thermal maintenance function of the inverter is preset reasonably. If the promised current of the inverter has no margin, can not be relaxed, and according to the production process, the overload is attributed to the normal overload, then it is clarified that the inverter is not properly selected, and the capacity of the inverter should be increased and the inverter should be replaced. This is because, when the motor is dragging a variable load or an intermittent load, as long as the temperature rise is too high, and the overload is attributed to the normal overload, it is clear that the motor is overloaded. In this case, the first consideration should be whether the gear ratio can be appropriately increased to reduce the load on the motor shaft. If it can be increased, the rolling ratio will be increased; If the gear ratio cannot be increased, the capacity of the motor should be increased.
(2) Check whether the three-phase voltage on the motor side is balanced.
If the three-phase voltage on the motor side is unbalanced, then check whether the three-phase voltage at the output end of the inverter is balanced, if it is unbalanced, the problem is inside the inverter, and the inverter module and its driving circuit of the inverter should be checked; If the voltage is balanced at the output of the inverter, the problem is in the line from the inverter to the motor, and it should be checked whether the screws at all terminals are tightened and whether the contacts are in good contact condition.
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