1, the power supply voltage is too high: when the power supply voltage exceeds the rated voltage, the inverter will automatically increase the output frequency to keep the motor running at the rated frequency.
2. Excessive motor load: When the motor load is too large, the motor needs more torque to overcome the resistance, resulting in an increase in the output frequency of the inverter.
3. Incorrect motor parameter setting: If the motor parameter setting is incorrect, such as pole number, current, voltage, etc. , the inverter will not be able to control the motor normally, resulting in an increase in output frequency.