2026-04-13Views：
To determine whether the press is fixed frequency or variable frequency, you can use the following methods:
observation method:
observe the LED on the compressor control panel. The constant frequency compressor usually has only one LED lamp, which is always on during operation. The inverter compressor has multiple LED lights, which will flash according to the load of the compressor during operation.
Test method:
by testing the output frequency of the compressor to judge. The output frequency of the fixed frequency compressor is fixed, usually 50Hz or 60Hz. The output frequency of the inverter compressor is automatically adjusted according to the load condition, and its frequency is generally changed between 40Hz and 70Hz (or wider range).
Control Panel Identification:
the inverter compressor is usually equipped with an external or built-in control panel, which will have parameter display and control buttons, which can easily control and monitor the compressor. The constant frequency compressor is only equipped with simple control buttons, such as start-stop buttons and knobs to adjust the pressure.
Operation observation:
the operation of the fixed frequency compressor is generally uniform and stable, and the speed is relatively fixed. The variable frequency compressor can realize the automatic adjustment of the compressor speed according to the change of the demand, and the speed may change during the operation.
Query method:
if the above method cannot be determined, you can consult the relevant information of the compressor, the manual or contact the manufacturer to obtain the type information of the compressor.
To sum up, by observing the LED lamp, testing the output frequency, identifying the control panel, observing the operation and inquiring the relevant information, it can effectively judge whether the press is fixed frequency or variable frequency.
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