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 induction motor, the current and speed of the motor may oscillate within certain frequency ranges. In severe cases, the system might fail to operate, especially during acceleration when overcurrent protection is triggered, preventing 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 specific frequency points and ranges on the U/f curve where the system tends to oscillate. These problematic frequencies are automatically skipped during acceleration, ensuring smooth and stable operation of the system.

(2) Overload Rate Setting

This setting is crucial for protecting both the inverter and the motor from overload conditions. When the inverter's output current exceeds the set overload ratio and the motor’s rated current, the inverter activates overload protection (OL) with an inverse time characteristic. Once triggered, the inverter stops outputting power to prevent damage to the system.

(3) Motor Parameter Input

The inverter requires several key motor parameters to be input, such as power rating, rated voltage, rated current, rated speed, and number of poles. Accurate input of these values is essential because they directly impact the proper functioning of various protection features within the inverter. It is vital to enter the actual motor specifications based on the nameplate data to ensure reliable and safe operation of the inverter.

Before using the inverter, it is recommended to input the motor's rated current, voltage, and frequency from its nameplate. The inverter has multiple protective functions designed to keep the motor operating within acceptable limits. In areas with low supply voltage, consider whether to disable the undervoltage shutdown protection based on your specific application needs. After configuring all parameters, it is advisable to lock the settings to prevent accidental changes by unauthorized personnel.