What are the top ten protection functions of the inverter?
1, over voltage protection
The output of the inverter has a voltage detection function, and the inverter can automatically adjust the output voltage so that the motor does not withstand overvoltage. Even when the output voltage adjustment fails and the output voltage exceeds 110% of the normal voltage, the inverter protects the motor by stopping the machine.
2, under voltage protection
When the voltage of the motor is lower than 90% of the normal voltage, the inverter protection stops.
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 protects the motor by stopping.
4, lack of phase protection
The output voltage is monitored. When the output is out of phase, the inverter will alarm. After a period of time, the inverter will stop the motor to protect the motor.
5, underload protection
1. The load suddenly becomes lighter. When the system is running, the load suddenly becomes lighter, which means that the work of the production machine has an accident, and the inverter stops working immediately.
2. Underload protection of vector control In the case of vector control mode, the load is too light, which will affect the operation result of vector control, so it should be protected.
6, overload protection
The inverter monitors the motor current. When the motor current exceeds 120%/1 minute of the rated current, the inverter protects the motor by stopping.
7, grounding 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 inverter alarms. Of course, if the user requests, we can also design to protect the shutdown immediately after grounding.
8, short circuit protection
After the inverter output is short-circuited, it will inevitably cause over-current. The inverter will stop the motor to protect the motor within 10 microseconds.
9, pressure gauge disconnection protection
When there is external PID adjustment in constant pressure water supply, air compressor, humidity control, etc., when the external pressure gauge is broken, self-detection and protection can be performed.
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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