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| The function of frequency converter |
| Energy-saving inverter
Inverter energy-saving is mainly manifested in the application of fan, water pump. In order to ensure the reliability of production, all kinds of production machinery in the design of power with drive, have a certain amount of surplus. When the motor is not operating under full load, in addition to the driving requirements, the extra torque increases power consumption, resulting in energy waste. Control method of fan, pumps and other equipment of traditional is regulated through the entrance or exit of the baffle, valve opening to regulate air and water, its high input power, and a large number of energy consumption in the interception process, the baffle valve. When using variable frequency speed regulation, if the flow rate is reduced, by reducing the pump or fan speed to meet the requirements.
The use of frequency converter motor function is to control, and reduce the starting current. In order to produce a variable voltage and frequency, the device must first to transform alternating current power supply for direct current (DC), this process is called rectification. The direct current (DC) converted to alternating current (AC) of the device, the scientific term for "inverter" (inverter). General inverter is the DC inverter to inverter power supply certain fixed frequency and voltage. For the inverter frequency adjustable, adjustable voltage inverter we called. The inverter output waveform is simulated sine wave, is mainly used in the speed control of three-phase asynchronous motor with frequency conversion governor, also called. For variable frequency inverter high requirement is mainly used in the detection equipment and instrument in the waveform, to sort out the waveform, can output the standard sine wave, called variable frequency power supply. General inverter power supply is 1520 times the price of inverter. As the main device changes the voltage or frequency converter device called "inverter", the product itself is named "inverter", namely: inverter.
Frequency conversion is not everywhere can save electricity, there are a lot of use frequency does not necessarily. As the electronic circuit, the inverter itself but also power consumption (about the rated power 3-5%). A 1.5 air-conditioning power consumption is itself also has 20-30W, equivalent to a continuous light. The frequency converter operation under the fundamental frequency, with power saving function, is a fact. But the premise condition of his:
First, high-power and fan / pump load;
Second, the device has the power saving function (software);
Third, long-term continuous operation.
This is the three conditions reflect power-saving effect. In addition, no day without electricity, no meaning. If not the prerequisite that inverter frequency energy-saving operation, is exaggerated or commercial speculation. Know the whole story, you will he to serve you with ingenious. Attention must be paid to the use of occasions and conditions of use it correctly applied, otherwise it is blind, believing "deceived".
Power factor compensation energy-saving
Wattless power not only increases the heat loss and equipment, more important is to reduce the power factor to reduce the active power power power, electric energy consumption in line, no large, low efficiency, serious waste of the use of equipment, the use of variable frequency speed control device, due to the internal filter capacitor, thereby reducing the reactive loss, increasing the active power grid.
Soft start energy-saving
Motor hard boot cause serious impact on the power grid, but also asking too much capacity on the grid, damage to the baffle and valve from starting current and vibration greatly, the service life of the equipment, the pipeline is very bad. While the use of frequency conversion energy-saving device, will make the starting current starting from scratch using the frequency converter soft-start function, will not exceed the maximum rated current, reduce the impact on the power grid and power supply capacity requirements, prolonging the service life of equipment and valves. Saving equipment maintenance costs.
Theoretically speaking, the inverter can be used in all motor with mechanical equipment, motor starting, the current is 5-6 times higher than the rated service life, will not only affect the motor and consumes more power. In the design of the system in the motor selection will leave some margin, the speed of the motor is fixed the same, but in the actual use of the process, sometimes running at low or high speed, so the frequency transformation is very necessary. Motor soft start, power factor compensation, by changing the frequency of the input voltage to achieve energy-saving control device to inverter, and can give the device provides overcurrent, overvoltage, overload protection function. | | | author: Published at: 2013/4/28 15:33:56 |  |
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