Economical inverter: If you want the economical inverter to fully protect the motor, you should pay attention to the process and settings. Set the setting parameters correctly, do not blindly increase the overload factor, maintain and check the motor regularly; pay attention to the load changes during the process (we require that the total current does not exceed 90%, and if it exceeds 90%, it should be controlled and checked).

1、 Why does the economical inverter burn out the motor?

The heat dissipation of ordinary asynchronous motors depends on the fan behind the motor. If the motor runs at low frequency for a long time (that is, it runs below the rated frequency of the motor for a long time), the motor speed is low, and the air volume blown by the fan is small, resulting in poor heat dissipation of the motor, and overheating will burn the motor. If the motor fails, the motor current will increase. If it exceeds the high current of the economic inverter, the economic inverter will implement protection and stop output, and report the fault code to the user.

The OC displayed by the economic inverter indicates overcurrent. The solution is to replace the motor with a dedicated variable frequency motor, or add a cooling fan to the motor, or replace the motor with a higher power motor.

2、 What is the reason why the economical inverter causes the motor to burn out?

In fact, the motor failure is not caused by the motor itself. It is mainly caused by improper debugging of the economical inverter or using a non-inverter motor when using an inverter motor. There are mainly the following situations:

（1）The frequency conversion motor adopts ordinary motor 

Since the cooling fan of an ordinary motor is connected to the rotating shaft, the speed is unstable when the economical frequency converter is used for speed regulation and cannot reach the rated speed of the motor. The cooling fan cannot function normally, resulting in poor heat dissipation of the motor. In addition, ordinary motors are not designed according to frequency conversion requirements, resulting in motor heating or burning.

（2）The variable frequency motor is directly connected to the economical inverter, no debugging is required

Vector control and V/F curve control are two common methods for inverters to control motors. For each control method, the motor type (synchronous, asynchronous, with or without encoder) should be the rated power, rated voltage, rated current, speed or number of poles, rated frequency, maximum operating frequency, acceleration and deceleration time for motor start and stop, and the protection mode, protection proportional coefficient, and carrier frequency of the economical inverter control motor are all set. After setting these parameters, select vector control or V/F control. When selecting vector control, the motor should match the inverter at no load, and perform dynamic self-learning or static self-learning with load. Only when the motor after self-learning cooperates with the inverter can the accuracy of vector control be brought into play; when selecting v/F control, no self-learning is required, and power can be directly turned on after the parameters are adjusted.

（3）The running direction of the variable frequency motor fan is inconsistent with the rotation direction marked on the fan. The fan cannot function, causing the motor's heat dissipation performance to deteriorate. The heat generated by the motor cannot be dissipated, causing the motor to heat up or burn.

Among the above three situations, the occurrence rates of items 2 and 3 are high. In view of the above situation, it is recommended that customers should choose inverter motors when choosing inverter-controlled motors, and inverters should be selected from manufacturers with good quality. Although the initial investment is slightly higher, the quality is guaranteed, the trouble-free operation time is long, and it is not easy to stop due to motor or inverter failure. The quality is good, the inverter after-sales service is guaranteed, and the response time is fast.