In what ways does the frequency converter protect the motor

In what ways do frequency converters protect motors? Frequency converters are widely used in various industries, mainly because of their energy saving and variable frequency speed regulation functions applied in equipment and operating system. So in what ways do frequency converters protect motors? Now we will analyze and answer this question.

The protection of frequency converter for motor mainly includes the following aspects: overvoltage protection, undervoltage protection, overcurrent protection, phase loss protection, phase reversal protection, overload protection, grounding protection, short circuit protection, overfrequency protection and stall protection. The following is a brief introduction to the protection methods of these types of inverters for motors.

1. Overvoltage protection:

The output of the frequency converter has a voltage detection function. The frequency converter can automatically adjust the output voltage so that the motor does not bear overvoltage. Even when the output voltage adjustment fails and the output voltage exceeds 110% of the normal voltage, the converter will protect the motor by stopping.

2. Undervoltage protection:

When the voltage of the motor is lower than 90% of the normal voltage, the converter will stop for protection.

3. Overcurrent protection:

When the current of the motor exceeds 150%/3s of the rated value, or 200%/10microseconds of the rated current, the frequency converter will stop to protect the motor.

4. Phase loss protection:

Monitor the output voltage. When the output is out of phase, the frequency converter will alarm. After a period of time, the frequency converter will stop to protect the motor.

5. Reverse phase protection:

The frequency converter makes the motor rotate in only one direction, and the rotation direction cannot be set. Unless the user changes the phase sequence of motor A, B, and C wiring, there is no possibility of reverse phase.

6. Overload protection:

The frequency converter monitors the motor current. When the motor current exceeds 120% of the rated current for 1 minute, the frequency converter stops to protect the motor.

7. Grounding protection:

The frequency converter is equipped with a special grounding protection circuit, which is generally composed of grounding protection transformer and relay. When one or two phases are grounded, the frequency converter will alarm. Of course, if the user requires, we can also design the protection shutdown immediately after grounding.