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The reason for motor burnout caused by incorrect parameter settings of the frequency converter

Release time:2018-11-29 10:49:00 Source:http://wap.gxsenge.net Classification:Company dynamics Views

Reasons for motor burnout caused by incorrect parameter settings of Guangxi frequency converters


The heating or burning of the motor caused by installing a frequency converter by oneself is often attributed to the quality problem of the motor due to unknown reasons. In fact, these seemingly motor faults are not actually caused by the motor itself. Most of them are caused by non-standard frequency converter debugging or the use of non variable frequency motors as variable frequency motors. There are mainly the following situations:


1. Use ordinary motors as variable frequency motors.


Due to the connection between the ordinary motor cooling fan and the shaft, when using a frequency converter for speed regulation, the speed is unstable and cannot reach the rated speed of the motor. The cooling fan cannot function properly, causing poor motor cooling; In addition, ordinary motors are not designed according to frequency conversion requirements, which can cause the motor to heat up or burn out.


2. The variable frequency motor and frequency converter are directly connected together for use without debugging.


The two commonly used methods for controlling motors with frequency converters are vector control and V/F curve control. Each control method must first set the type of motor (synchronous, asynchronous, with or without encoder), 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, protection method for motor controlled by frequency converters, protection ratio coefficient, carrier frequency, etc., and none of them are missing. After setting these parameters, choose whether it is vector control or V/F control. When choosing vector control, the motor needs to be paired with the frequency converter for dynamic self-learning or static self-learning with load. After self-learning, the motor can only achieve the accuracy of vector control by cooperating with the frequency converter; When selecting V/F control, there is no need for self-learning. After adjusting the parameters, it can be directly powered on for operation.


3. The running direction of the variable frequency motor fan is inconsistent with the rotation direction indicated on the fan, and the fan cannot function, resulting in a deterioration of the motor's heat dissipation condition. The heat generated by the motor cannot be dissipated, causing the motor to heat up or burn out.


4. 2 and 3 of the above three situations occur more frequently


When the motor current in the frequency converter is set too high and the motor protection parameters are set too high, the frequency converter cannot protect the motor according to the actual current of the motor when the motor is overloaded, resulting in motor overload, heating or burning;


When the motor speed is not set correctly, if the set speed exceeds the rated speed of the motor, the motor will run at a higher speed in the constant power zone at the rated frequency point. The higher the speed, the smaller the output torque, causing excessive motor current to heat up or burn out the motor;


If the acceleration and deceleration time of the motor is too short, the frequency converter will report an overcurrent fault and protect it;


The frequency converter adopts vector control, but the self-learning between the motor and the frequency converter is not paired, causing the parameters of the motor controlled by the frequency converter to not match the actual value of the motor, resulting in poor control accuracy, motor heating or burning;


When the carrier frequency is set relatively high, the switching speed of the frequency converter switch tube is relatively high, and the heat generation increases. At this time, the ability of the frequency converter to resist changes in load current decreases. When the load current increases, the frequency converter may trip due to overcurrent, which is reflected on the surface as a problem with the electrical machine;


The motor protection current is not set, and most frequency converters default to a protection current of 150% of the rated output current of the frequency converter. The frequency converter only protects when the motor current reaches this value; The output current of the frequency converter should be greater than the rated current of the motor. When the current of the motor reaches the protection current of the frequency converter, the motor is actually overloaded by far more than 150%, causing severe heating and burning of the motor. The phenomenon that customers see is that the frequency converter is not a problem, and the quality of the motor is unreliable.


5. In response to the above situation, it is recommended that customers choose variable frequency motors when choosing variable frequency control motors. The frequency converter should be selected from a manufacturer with good quality. Although the initial investment is a bit higher, the quality is guaranteed, the fault free operation time is long, and it is not easy to cause production stoppages due to motor or frequency converter failures. In addition, high-quality frequency converter after-sales service is guaranteed, and the response time is fast.


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