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Inverter frequency limit

Frequency limit refers to the upper and lower amplitude limits of the inverter output frequency. Frequency limit is a protection function to prevent misoperation or failure of the external frequency setting signal source, causing the output frequency to be too high or too low, thereby preventing damage to the device.

Just set it according to the actual situation in the application. This function can also be used as a speed limiter. For example, if there is a belt conveyor, since there is not too much material to be transported, in order to reduce the wear of the machine and the belt, it can be driven by a frequency converter, and the upper limit frequency of the frequency converter can be set to a certain frequency value. , so that the belt conveyor can run at a fixed, lower working speed.

Maximum frequency and basic frequency of the inverter

As mentioned before, the frequency converter changes the frequency of the output power supply and also changes the voltage of the output power supply, which is called frequency conversion and voltage conversion. The basic frequency is the minimum output frequency when the output voltage of the inverter is equal to the rated voltage. The maximum frequency is the maximum frequency that the inverter allows to output, expressed by fmax. Its specific meaning varies slightly depending on how the frequency is given.

(1) When the frequency is given by the keyboard, the highest frequency means the maximum frequency that can be adjusted. That is to say, after reaching the highest frequency, the frequency cannot rise anymore even if the increase key is pressed again.

(2) When frequency is given through an external analog quantity, the highest frequency usually refers to the frequency corresponding to the largest given signal. That is to say, when the voltage is controlled from 0 to 5V, the frequency corresponding to SV is the highest frequency.