As an electronic circuit, the frequency converter itself also consumes power (approximately 3-5% of its rated power). A 1.5 horsepower air conditioner consumes about 20-30W, equivalent to a light bulb left on continuously. It is a fact that frequency converters operate at the mains frequency and have energy-saving functions.
As an electronic circuit, the frequency converter itself also consumes power (approximately 3-5% of its rated power). A 1.5 horsepower air conditioner consumes about 20-30W, equivalent to a light bulb left on continuously. It is a fact that frequency converters operate at the mains frequency and have energy-saving functions.
But the prerequisite is
First, high power and for fan/pump type loads.
Second, the device itself has power-saving functions (software supported).
Third, long-term continuous operation
The above are three conditions that demonstrate the energy-saving effect of frequency converters. To claim that a frequency converter saves energy when operating at power frequency without considering these conditions is either exaggeration or commercial hype. Understanding the reasons will allow you to skillfully utilize it for your benefit. It is crucial to pay attention to the application scenario and conditions for correct application; otherwise, it is simply blindly following trends.
Power factor compensation energy saving
Reactive power not only increases line losses and equipment heating, but more importantly, the reduction in power factor leads to a decrease in the active power of the power grid. A large amount of reactive power is consumed in the lines, resulting in low equipment efficiency and serious waste.
After using a variable frequency speed control device, the reactive power loss is reduced and the active power of the power grid is increased due to the effect of the internal filter capacitor of the frequency converter.
Soft start energy saving
Hard starting of motors causes severe impact on the power grid and places excessive demands on the grid capacity. The large current and vibration generated during startup cause great damage to baffles and valves, which is extremely detrimental to the service life of equipment and pipelines.
By using a frequency converter energy-saving device, the soft-start function of the frequency converter will allow the starting current to start from zero, and the maximum value will not exceed the rated current. This can reduce the impact on the power grid and the requirements for power supply capacity, extend the service life of equipment and valves, and save on equipment maintenance costs.
In theory, frequency converters can be used in all mechanical equipment with electric motors. When a motor starts, the current is 5-6 times higher than its rated current, which not only affects the motor's lifespan but also consumes a significant amount of electricity. While the system design includes a certain margin in motor selection, and the motor speed is fixed, in actual use, it is sometimes necessary to operate at lower or higher speeds. Therefore, frequency conversion retrofitting is essential.
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