1, overvoltage protection

Inverter output has automatic voltage regulation function, when the external power input is too high, the output voltage can be controlled to exceed the rated voltage of the permanent magnet synchronous motor.

2, undervoltage protection

When the voltage of the permanent magnet synchronous motor is lower than 90% of the normal voltage, the inverter enters the output mode to protect the permanent magnet synchronous motor reduces the output frequency. When the permanent magnet synchronous motor voltage is lower than 65.2% of the normal voltage, the motor will be stopped.

3, overcurrent protection

When the current of the permanent magnet synchronous motor exceeds a certain range of rated value, the inverter protects the permanent magnet synchronous motor by stopping.

4, lack of phase protection

Monitor the output voltage, when the output is out of phase, the frequency converter alarms, after a period of time, the frequency converter protects the permanent magnet synchronous motor by stopping.

5, overload protection

The frequency converter monitors the current of the permanent magnet synchronous motor, when the rated current of the permanent magnet synchronous motor is exceeded, the heat calculated by the inverse time curve is used to protect the motor. When the permanent magnet synchronous motor exceeds the rated current by 2 times reaches 1 minute, the frequency converter protects the motor by stopping.

6, grounding protection

Generally composed of ground protection transformer relay, when one two phase ground, frequency converter alarm.