In what ways does the frequency converter protect the motor? The frequency converter is widely used, mainly because of its energy saving and the application of some industrial control systems. So from what aspects does the frequency converter protect the motor? Now Analytical answers to this question were made.
In what ways does the frequency converter protect the motor?
The protection of the inverter to the motor mainly includes the following aspects: overvoltage protection, undervoltage protection, overcurrent protection, phase loss protection, reverse phase 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 the motor.
1. Overvoltage protection
The output of the frequency converter has a voltage detection function, and the frequency converter can automatically adjust the output voltage to prevent the motor from overvoltage. Even when the output voltage adjustment fails and the output voltage exceeds 110% of the normal voltage, the inverter will protect the motor by stopping.
2. Undervoltage protection
When the voltage of the motor is lower than 90% of the normal voltage, the inverter will stop for protection.
3. Over current protection
When the current of the motor exceeds 150%/3 seconds of the rated value, or 200%/10 microseconds of the rated current, the inverter will stop to protect the motor.
4. Phase loss protection
Monitor the output voltage. When the output phase is missing, the inverter will alarm. After a period of time, the inverter will stop to protect the motor.
5. Reverse phase protection
The frequency converter makes the motor rotate in only one direction, and the direction of rotation cannot be set. Unless the user changes the phase sequence of the motor A, B, and C connections, there is no possibility of reverse phase.
6. Overload protection
The frequency converter monitors the motor current, and when the motor current exceeds 120% of the rated current/1 minute, the frequency converter protects the motor by shutting down.
7. Ground protection
The frequency converter is equipped with a special grounding protection circuit, which is generally composed of a grounding protection transformer and a relay. When one or two phases are grounded, the frequency converter will alarm. Of course, if the user requires, we can also design it to protect and stop immediately after grounding.
8. Short circuit protection
After the output of the inverter is short-circuited, it will inevitably cause overcurrent, and the inverter will stop to protect the motor within 10 microseconds.
9. Overclocking Protection
The inverter has maximum and minimum frequency limiting functions, so that the output frequency can only be within the specified range, thereby realizing the overfrequency protection function.
10. Stall protection
Stall protection is generally for synchronous motors. For asynchronous motors, the stall in the acceleration process must be manifested as overcurrent, and the frequency converter realizes this protection function through overcurrent and overload protection. Stall during deceleration can be avoided by setting a safe deceleration time during commissioning.
In what ways does the frequency converter protect the motor? The frequency converter is widely used, mainly because of its energy saving and the application of some industrial control systems. So from what aspects does the frequency converter protect the motor? Now Analytical answers to this question were made.
In what ways does the frequency converter protect the motor?
The protection of the inverter to the motor mainly includes the following aspects: overvoltage protection, undervoltage protection, overcurrent protection, phase loss protection, reverse phase 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 the motor.
1. Overvoltage protection
The output of the frequency converter has a voltage detection function, and the frequency converter can automatically adjust the output voltage to prevent the motor from overvoltage. Even when the output voltage adjustment fails and the output voltage exceeds 110% of the normal voltage, the inverter will protect the motor by stopping.
2. Undervoltage protection
When the voltage of the motor is lower than 90% of the normal voltage, the inverter will stop for protection.
3. Over current protection
When the current of the motor exceeds 150%/3 seconds of the rated value, or 200%/10 microseconds of the rated current, the inverter will stop to protect the motor.
4. Phase loss protection
Monitor the output voltage. When the output phase is missing, the inverter will alarm. After a period of time, the inverter will stop to protect the motor.
5. Reverse phase protection
The frequency converter makes the motor rotate in only one direction, and the direction of rotation cannot be set. Unless the user changes the phase sequence of the motor A, B, and C connections, there is no possibility of reverse phase.
6. Overload protection
The frequency converter monitors the motor current, and when the motor current exceeds 120% of the rated current/1 minute, the frequency converter protects the motor by shutting down.
7. Ground protection
The frequency converter is equipped with a special grounding protection circuit, which is generally composed of a grounding protection transformer and a relay. When one or two phases are grounded, the frequency converter will alarm. Of course, if the user requires, we can also design it to protect and stop immediately after grounding.
8. Short circuit protection
After the output of the inverter is short-circuited, it will inevitably cause overcurrent, and the inverter will stop to protect the motor within 10 microseconds.
9. Overclocking Protection
The inverter has maximum and minimum frequency limiting functions, so that the output frequency can only be within the specified range, thereby realizing the overfrequency protection function.
10. Stall protection
Stall protection is generally for synchronous motors. For asynchronous motors, the stall in the acceleration process must be manifested as overcurrent, and the frequency converter realizes this protection function through overcurrent and overload protection. Stall during deceleration can be avoided by setting a safe deceleration time during commissioning.
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