Inverter frequency jump, overload rate and motor parameter input settings - News - Global IC Trade Starts Here Free

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(1) Frequency Jump

When using a U/f controlled inverter to drive an asynchronous motor, the motor's current and speed can oscillate within certain frequency ranges. In severe cases, the system may fail to operate, even during acceleration, leading to overcurrent protection in the inverter, which prevents the motor from starting properly. This issue is more pronounced when the motor is lightly loaded or has low inertia. By utilizing the frequency jump function of the inverter, you can set the jump points and the width of the frequency range on the U/f curve based on the frequencies where the system experiences oscillation. The inverter will automatically skip these frequency segments during acceleration, ensuring stable operation of the system.

(2) Overload Rate Setting

This setting is used for overload protection of both the inverter and the motor. If the inverter’s output current exceeds the set overload ratio and the rated motor current, the inverter will trigger overload protection (OL) with an inverse time characteristic, and it will stop outputting power once the protection is activated. This helps prevent damage to the motor and inverter under excessive load conditions.

(3) Input of Motor Parameters

Some of the parameters required for the inverter include basic motor parameters such as power, rated voltage, rated current, rated speed, and number of poles. Accurate input of these values is essential, as they directly impact the proper functioning of the inverter's protection features. It is crucial to enter the actual motor specifications, such as those found on the motor’s nameplate, including rated current, voltage, and frequency. This ensures that the inverter can protect the motor effectively within safe operating limits. In areas with low supply voltage, consider whether to disable the undervoltage shutdown protection based on your specific application. After configuring all parameters, it is recommended to lock them to prevent unauthorized changes by others.