Inverter overloads trip causes and inspection methods

Frequency inverter overload trip What reasons? This is a common problem. Overload is the motor to rotate, but the running current exceeds the ratings. It overloads although the main current exceeds the rating, but more than the modest, nor form a large inrush current. So under what circumstances would overload it?
The main reason of inverter overload

Reason 1. The variable frequency drive overload first mechanical overloading cause overload, the main features of mechanical overload is heating of the motor, the same time and can be read from the display to run current discovery. If the three-phase voltage imbalance can cause a running current phase is too large, eventually leading cause overload trip, it is characterized by uneven heating of the motor.
2. If the variable frequency drive inverter overload trip reason there may be a malfunction cause, there may be current detection section inside the inverter fails, the detected current signal is too large, resulting in an overload trip.
3, three-phase voltage imbalance can also cause a running current phase is too large, leading to overload trip, which is characterized by uneven heating of the motor, read the operating current from the display may not be able to find (due to display only one phase current).
Check whether the method of inverter overload
1. Check the motor side of the three-phase voltage is balanced, if the three-phase voltage unbalance motor side, you should then check the drive output phase voltage is balanced, such as uneven, the problem is inside the drive.
As the output of the inverter voltage balance, the problem is on line from the inverter to the motor between the terminals should check whether all screws are tight, or if there is contact between the inverter and other electrical motors, you also Should the inspection of the electrical terminals are tight, and the contact is in good condition and so on contact.
If the motor side of the three-phase voltage balance, should be aware of when the trip Frequency: as a lower frequency, but not with the vector control (or no vector control), the first lower U / f ratio can still drive the load if reduced , then the original preset U / f ratio is too high, the peak excitation current is too large, can be reduced by reducing the current U / f ratio; If the belt does not move to reduce the load, and you should consider increasing the inverter capacity; if the drive has a vector control, vector control method should be used.
2, check whether the motor heat, if the temperature rise of the motor is not high, first check the electronic thermal protection function of the inverter was preset is reasonable, as there inverter margin should relax preset electronic thermal protection function value.
If the motor temperature rise too high, and that appears overload and overload is normal, it indicates that the motor is overloaded. In this case, first gear ratio can be appropriately increased to reduce the load on the motor shaft. As can be increased, then increase the transmission ratio. If the gear ratio can not be increased, it should increase the capacity of the motor.
The above analysis inverter overload trip which reason, I hope for your help. If you purchased any of the drive, you can call RENDA frequency inverter manufacturer hotline +86-755-29833888-648 Professional customer service will solve problems for you.