Detailed knowledge: Ten protection measures for the inverter to the motor

We all know that the inverter adjusts the voltage and frequency of the output power supply by the internal IGBT breaking, and supplies the required power supply voltage according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed regulation. What are the ways and measures for the inverter to protect the motor? Let Xiaobian take everyone to see it!

1. Overvoltage protection The output of the inverter has a voltage detection function. The inverter can automatically adjust the output voltage so that the motor does not withstand overvoltage and the motor runs within the set voltage range.

2. Undervoltage protection When the voltage of the motor is lower than 90% of the normal voltage (some settings are 85%), the inverter protection stops.

3. Overcurrent 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 protects the motor by stopping.

4. The phase loss protection monitors the output voltage. When the output is out of phase, the inverter will alarm and the inverter will stop immediately to protect the motor.

5, anti-phase protection Inverter can be set so that the motor can only rotate in one direction, can not set the direction of rotation, unless the user changes the phase sequence of the motor A, B, C wiring, otherwise there is no possibility of inversion.

6. Overload protection The inverter monitors the motor current. When the motor current exceeds 120%/1 minute of the set rated current, the inverter protects the motor by stopping.

7. Grounding protection The inverter 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 inverter stops immediately. Of course, if the user requests, we can also design to protect the shutdown immediately after grounding.

8. Short-circuit protection After the output of the inverter is short-circuited, it will inevitably cause over-current. The inverter will stop the motor to protect the motor within 10 microseconds.

9. Overclocking protection The inverter has maximum and minimum frequency limit functions, so that the output frequency can only be within the specified range, thus achieving overclocking protection.

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 inverter achieves 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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