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1, over-voltage protection The inverter output voltage detection, the inverter can automatically adjust the output voltage so that the motor does not withstand over-voltage, the motor running in the set voltage range.
2, under voltage protection When the motor voltage is lower than 90% of normal voltage (some set to 85%), the inverter protection down.
3, Overcurrent protection When the motor current exceeds the rated value of 150% / 3 seconds, or rated current of 200% / 10 microseconds, the inverter through the shutdown to protect the motor.
4, phase loss protection monitoring output voltage, when the output phase loss, the inverter alarm, inverter immediately stop to protect the motor.
5. Inverting protection The inverter can be set so that the motor can only rotate in one direction and can not set the rotation direction. There is no reverse phase unless the user changes the phase sequence of the motor A, B, C wiring.
6, Overload protection The inverter monitors the motor current. When the motor current exceeds 120% of the set rated current for 1 minute, the inverter protects the motor by stopping.
7, Ground fault protection The inverter is equipped with a special ground fault protection circuit. It is generally composed of a ground fault protection transformer and a relay. When one or two phases are grounded, the inverter stops immediately. Of course, if the user request, we can also be designed to protect downtime immediately after grounding.
8, short circuit protection After inverter output short circuit, it will inevitably cause overcurrent, inverter in 10 microseconds to protect the motor through the shutdown.
9, Overclocking The inverter has the maximum and minimum frequency limiting function, so that the output frequency can only be within the specified range, thus achieving overclocking protection.
10, stall protection Stall protection generally for synchronous motor. For induction motors, the stalling during acceleration must be overcurrent, which is achieved by the drive overcurrent and overload protection. Stall during deceleration can be avoided by setting a safe deceleration time during commissioning.
As we all know, the inverter adjusts the voltage and frequency of the output power by turning off the internal IGBT, and provides the required power voltage according to the actual needs of the motor so as to achieve the purpose of energy saving and speed regulation. That inverter protection of motor methods and measures are what? Let Xiaobian take everyone to see it!